• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A brazing or reloading method comprising the following steps: - supplying at least one piece (51) comprising a metal or a metal alloy, for example stainless steel, the piece (51) comprising at least one face ( 59) defining a plurality of interstices (61) having at least two opposite edges separated on the face (59) by a maximum distance of less than or equal to 250 micrometers, - obtaining a coating (R) in contact with said face and comprising at least a first layer (85) located at least partly in the interstices, and a second layer (87) adjacent to the first layer, the first layer (85) comprising a first powder (A) comprising a metal or a metal alloy, the second layer comprising a mixture of a second powder (B) and a third powder (C), the second powder and the third powder being respectively distinct alloys between them and suitable for brazing or recharging l one piece, and the solidus temperature TSC of the third powder being lower than the TSB solidus temperature of the second powder, - heating of the part and the coating at a heating temperature strictly below the TSA solidus temperature of the first powder, lower than the TSB solidus temperature, and strictly above the solidus TSC temperature, and at least partial melting of the coating, and - cooling of the part and the coating, and obtaining a solidified residue fixed on the part.
    公开号:FR3066935A1
    申请号:FR1754864
    申请日:2017-06-01
    公开日:2018-12-07
    发明作者:Thierry MAZET；Pierre Billat
    申请人:Stiral；
    IPC主号:
    专利说明:

    Method of brazing or recharging a part with micro-interstices, and heat exchanger obtained by such a process.
    The present invention relates to a brazing or recharging method comprising a step of applying a coating to a part comprising interstices, heating with at least partial melting of the coating, and cooling to obtain a solidified residue fixed to the part. .
    The invention also relates to a heat exchanger thus obtained, the part then being an element defining circulation channels intended for at least two fluids between which it is desired to carry out a heat exchange.
    It is well known to use soldering to assemble parts, in particular for the purpose of assembling a heat exchanger or a part of a heat exchanger.
    Reloading allows a supply of material, for example to consolidate or seal a surface.
    In addition, a known type of heat exchanger implements a part made of a metal sheet folded back on itself in an accordion. Two sheets fixed on either side of the metal sheet define circulation channels locally parallel to a longitudinal direction and located on each side of the metal sheet. The longitudinal ends of the channels open onto transverse faces of the accordion sheet in which the channels define interstices.
    The channels located on one side of the metal sheet are traversed by a cold fluid, while those located on the other side are traversed by a hot fluid. Thus, between two sheets flow two fluids, separated from each other by the metal sheet and exchanging heat with each other through the metal sheet.
    The accordion sheets, and the sheets covered on both sides with a brazing film are alternately stacked on top of each other so as to constitute a block called a matrix. This stack is then assembled in a first step in a brazing oven. The matrix generally comprises a first and last plate of greater thickness than the sheets.
    To seal the matrix on its periphery, bars, called closing bars are generally fixed on the matrix. Fluid supply heads are then added to the matrix to form the exchanger.
    Because of the expansion differentials between the parts, which prevent the geometric constituents of the future exchanger from being overly constrained, several brazing stages are generally practiced, between which machining operations are carried out so as to guarantee the play between parts. This practice requires a great mastery of the nuances of filler alloys so as not to degrade during the next step the junctions made in the previous step
    A first method consists in making, initially, a closed or semi-open frame in which we will insert an accordion sheet to assemble it by brazing for the first time. In a second step, a set of these frames is assembled by brazing in order to constitute the matrix of the exchanger. Thirdly, the fluid connection tubes are brazed to the matrix.
    A second method consists, in a first step, in assembling by brazing all of the accordion sheets on all of the sheets, to which the longitudinally oriented closing bars are optionally joined. In a second step, the faces of the leaves are accordion-shaped to align them perfectly, in order to assemble them by brazing with the closing bars oriented transversely. The matrix of the exchanger is thus obtained. Finally, in a third step, the fluid connection tubes are brazed on the matrix.
    Furthermore, there is a need, in various industrial sectors, such as the automobile or aeronautics, to reduce, on the one hand, the space created by the thermal circuits and their mass and, on the other hand, the quantity of fluids involved in the exchanges. Indeed, these fluids sometimes have an impact on the environment, which should be minimized.
    However, the smaller the exchangers, the more difficult the second step is, that is to say the brazing of the closure bars on the face of the accordion sheets having the interstices described above. An object of the invention is therefore to provide a soldering or recharging method for treating parts such as the aforementioned accordion part, having micro-gaps in particular for making small exchangers.
    To this end, the invention relates to a soldering or recharging process comprising the following steps:
    - Supply of at least one part comprising, at least 90% by mass, a metal or a metal alloy, for example stainless steel, the part comprising at least one face defining a plurality of interstices, the interstices comprising at least two opposite edges separated on the face by a maximum distance less than or equal to 250 micrometers, preferably less than or equal to 150 micrometers,
    - Obtaining a coating in contact with said face, the coating comprising at least a first layer located at least partially in the interstices, and a second layer adjacent to the first layer, the first layer comprising a first powder comprising, at least minus 90% by mass, a metal or a metal alloy and having a TSA solidus temperature, the second layer comprising a mixture of a second powder and a third powder, the second powder and the third powder being respectively alloys distinct from each other and suitable for brazing or recharging the part, one and / or the other of these alloys being for example a nickel alloy, the second powder having a TSB solidus temperature, and the third powder having a temperature of solidus TSC strictly below the temperature of solidus TSB,
    heating the part and the coating to a strictly heating temperature, on the one hand, lower than the solidus temperature TSA, and, on the other hand, lower, preferably strictly, than the solidus temperature TSB, and strictly higher than the solidus temperature TSC, and at least partial melting of the coating, and
    - cooling of the part and the coating at least partially melted, and obtaining a solidified residue fixed on the part.
    According to particular embodiments, the method comprises one or more of the following characteristics, taken alone or in any technically possible combination:
    - The first powder comprises, at least 90% by mass, the same metal or the same metal alloy as the part;
    the second powder represents, in said mixture, a proportion by mass of between 60% and 95%, preferably between 70% and 90%, and even more preferably between 75% and 85%, said proportion by mass s' hearing before mixing;
    - The third powder comprises at least 70% by mass of nickel;
    - The solidified residue extends into said interstices to a depth between 0.1 mm and 3 mm, preferably between 0.2 mm and 1 mm, and even more preferably between 0.3 and 0.7 mm;
    - The first powder has a grain size less than 150 micrometers, preferably less than 44 micrometers;
    - The second powder and the third powder have a grain size less than 212 micrometers, preferably less than 105 micrometers;
    in the obtaining step, the first layer and the second layer respectively comprise an organic binder, preferably with an aqueous base, the binders representing respectively between 0.5% and 4% by mass of the first layer, and between 0, 2% and 2% by mass of the second layer, the first layer is applied to the part and the second layer is applied to the first layer, the second layer optionally covering at least part of the part (51) not covered by the first layer, and optionally the coating is compacted under a pressure of 0.1 to 6 bars, preferably under a pressure of about 1 bar;
    the part is configured to form at least part of a heat exchanger, the part preferably comprising at least one metal sheet folded in an accordion, the metal sheet defining a plurality of circulation channels for at least two fluids intended to circulate from each side of the metal sheet, each circulation channel having an end defining one of the interstices of said face;
    - The solidified residue completely closes said interstices; and
    the third powder having a TLC liquidus temperature, the heating temperature is greater than or equal to the TLC liquidus temperature.
    The invention also relates to a heat exchanger comprising at least one piece of stainless steel, the piece comprising at least one face defining a plurality of interstices, the interstices comprising at least two opposite edges separated by a maximum distance less than or equal to 250 micrometers , preferably less than or equal to 150 micrometers, the part preferably comprising at least one metal sheet folded in accordion, the metal sheet defining a plurality of circulation channels for at least two fluids intended to circulate on each side of the metal sheet, each circulation channel comprising an end defining one of the interstices of said face, and at least one solidified residue fixed to the part, the solidified residue capable of being obtained by a process as described above.
    The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the appended drawings, in which:
    FIG. 1 is a perspective view of a heat exchanger according to the invention,
    - Figure 2 is a perspective view of the matrix of the heat exchanger shown in Figure 1, the fluid collectors having been removed,
    FIG. 3 is a partial front view of the exchanger matrix shown in FIGS. 1 and 2,
    FIG. 4 is a perspective view of one of the stages of the matrix shown in FIG. 3, and
    - Figure 5 is an exploded perspective view of the floor shown in Figure 4, and of a coating intended to laterally close this floor.
    Referring to Figures 1 to 3, a heat exchanger 1 according to the invention is described.
    As shown in FIG. 1, the exchanger 1 comprises a matrix 5, and four members 7, 9, 11, 13 for respectively supplying a cold fluid F1, recovering a heated fluid F1 ', supplying a hot fluid F2, and recovering a cooled fluid F2 '.
    The cold fluid is for example water or a mixture of water and glycol.
    The hot fluid is for example a refrigerant of HFE (hydrofluoroether) or HFO (hydrofluoroolefin) type, as is the case in a heat pump. When cooling the oil of a heat engine, the hot fluid is the oil to be cooled.
    The matrix 5 comprises for example four stages 15, 17, 19, 21 superimposed in a direction V, for example vertical, and two end plates 23, 25 respectively forming an upper face 27 and a lower face 29 of the matrix.
    The matrix 5 is for example of parallelepiped shape. The matrix 5 comprises two lateral faces 31, 33 (FIG. 2) opposite in a longitudinal direction L substantially perpendicular to the direction V, and two lateral faces 35, 37 opposite in a transverse direction T substantially perpendicular to the direction V and to the direction longitudinal L.
    The lateral faces 31, 33, 35, 37 are for example rectangular, and two of them consecutive around the direction V advantageously form a substantially right angle.
    The lateral face 31 comprises for example three inputs E1, E2, E3 for three flows F11, F12 and F13 coming from the cold fluid F1, and two outputs S1 ', S2' for two flows F21 'and F22' intended to form the cooled fluid F2 '.
    The side face 33 has two inlets (not visible in FIG. 2 as located at the rear) for two streams F21 and F22 from the hot fluid F2, and three outlets (also not visible in FIG. 2) for three streams F11 ' , F12 'and F13' intended to form the heated fluid F1 '.
    As shown in Figures 2 and 3, the stages 15, 17, 19, 21 are substantially similar to each other.
    The aforementioned inputs and outputs appear, for example, as slots extending transversely on the lateral faces 31, 33.
    The inputs E1, E2 and E3 are for example aligned in the direction V and situated opposite the member 7.
    The same applies to the entrances located on the lateral face 33, except that they are located opposite the member 11.
    The outputs ST and S2 ′ are for example superimposed in the direction V and located opposite the member 13. The same applies for the outputs located on the lateral face 33, except that they are located opposite the member 9.
    The stages 15 to 21 are formed by sheets 39, 41, 43, 45, 47 substantially perpendicular to the direction V and alternating with parts 49, 51, 53, 55. The stages are also closed laterally by solidified residues 57 extending between the sheets 39, 41, 43, 45, 47 in the direction V.
    In the example shown, the parts 49, 51, 53, 55 are similar to each other, so only the part 51 belonging to stage 17 will be described below with reference to FIGS. 3 to 5.
    The part 51 is made of metal or of a metal alloy, advantageously of 316L stainless steel, and for example of 316L. The part 51 is formed by a metal sheet 58 folded back on itself in an accordion in the longitudinal direction L. The part 51 defines a plurality of circulation channels 63 situated above the metal sheet and intended to receive the flow F21, and a plurality of circulation channels 65 located under the metal sheet and intended to receive the flow F12.
    The part 51 has two longitudinally opposite faces 59, 60, in which the channels 63, 65 define interstices 61.
    The interstices 61 have two edges 67, 69 (FIG. 3) opposite transversely and separated by a maximum distance D less than or equal to 250 μm, preferably less than or equal to 150 μm.
    The sheets 39, 41, 43, 45, 47 are structurally analogous to each other. The sheets 39, 43, 47 have the same orientation in space, while the sheets 41 and 45 have another orientation in space, deduced from the first for example by a rotation of 180 ° around the longitudinal direction L.
    Each of the sheets 39, 41, 43, 45, 47 has for example a generally rectangular shape in view in the direction V. Each of the sheets has two cutouts 71,73 (FIG. 5), for example symmetrical to one another by with respect to a point S located in the center of the sheet.
    Each of the cutouts 71, 73 comprises a first part 75 extending longitudinally from one of the lateral faces 31 or 33 of the matrix 5, and a second part 77 extending transversely above the circulation channels 63, or below the circulation channels 65.
    According to variants not shown, each of the cutouts 71, 73 comprises a first part 75 extending transversely from one of the lateral faces 35 or 37 of the matrix 5, and a second part 77 extending transversely in the extension of the first part 75, above the circulation channels 63, or below the circulation channels 65.
    The sheets 39, 41, 43, 45, 47 are made of metal or a metal alloy, for example stainless steel, advantageously 316L. The sheets are fixed respectively on the parts 49, 51, 53, 55, for example by conventional brazing.
    The members 7, 9, 11, 13 are advantageously similar to each other. Also, only the member 7 will be described in detail below.
    The member 7 is made of metal or a metal alloy, for example stainless steel, advantageously 316L. The member 7 comprises a tubular upper part 79, and a lower part 81 situated in the extension of the first part in the direction V and obtained by cutting along a plane corresponding to the upper face 27 and along a plane corresponding to the lateral face. 31. The member 7 also includes a bottom 83.
    The manufacture of the exchanger 1 will now be described. It implements a brazing method according to the invention.
    We first supply the parts 49, 51, 53, 55, as well as the sheets 39, 41, 43, 45, 47 inserts, the end plates 23, 25 and the members 7, 9, 11, 13.
    These elements are stacked as shown in FIGS. 3 and 4 in the direction V, by interposing between each of the brazing sheets 85A as shown in FIG. 5.
    The brazing sheets 85A are made of a brazing alloy, for example of BNi-2 alloy.
    The assembly of parts 49, 51, 53, 55, sheets 39, 41, 43, 45, 47 and end plates 23 and 25 is carried out by stacking, and mechanically maintained by means of a suitable tool (not shown).
    Then a coating R is produced on each lateral face of the parts 49, 51, 53, 55, respectively between the sheets 39, 41, 43, 45, 47 in the direction V. In particular, the coating R is in contact with the faces 59 , 60 comprising the gaps 61.
    Finally, the assembly and the coating R are heated to a heating temperature TF to at least partially melt the coating R.
    After cooling, the solidified residue 57 is obtained.
    The members 7, 9, 11, 13 are then fixed to the matrix 5 by soldering, welding, bonding or any other process adapted to the conditions of future use of the exchanger.
    According to another more economical embodiment, the members 7, 9, 11, 13 are placed on the assembly formed by the assembly and the coating R, before the new assembly thus formed is heated and then cooled. This allows an exchanger to be obtained after a single brazing cycle.
    To obtain the coating R, in the example shown, a first layer 85 (FIG. 5) is applied to each of the parts 49, 51, 53, 55, and a second layer 87 is applied to the first layer.
    As a variant, the coating R is only present on the lateral faces 31 and 33. In fact, the lateral faces 35 and 37 do not, in the example described, have microinterstices.
    According to a particular embodiment (not shown) the second layer 87 covers at least part of the parts 49 to 55 not covered by the first layer 85.
    The second layer 87 has for example a thickness ranging from 1 to 10 times the thickness of the first layer 85.
    Optionally, the coating R is compacted under a pressure of 0.1 to 6 bars, preferably under a pressure of about 1 bar, for example by evacuating the assembled assembly, after the assembly has been placed in a flexible and airtight membrane (not shown).
    The first layer 85 is located at least partly in the interstices 61, and is preferably embedded in the metal sheet in accordion. In other words, the first layer 85 penetrates into the interstices 61 in the longitudinal direction L.
    The first layer 85 comprises, advantageously at least 90% by mass, a first powder A consisting of a metal or a metal alloy and having a solidus temperature TSA (temperature at which the first drop of liquid appears when the first powder A) is heated which is strictly higher than the heating temperature TF. In other words, the first powder A is not fusible at the heating temperature TF of the process according to the invention.
    If the first powder A is a pure material, it goes without saying that the solidus temperature TSA is the melting temperature of the pure material.
    Advantageously, the first powder A comprises, at least 90% by mass, the same metal or the same metal alloy as parts 49 to 55, that is to say stainless steel 316L in the example.
    The first powder A has grains whose size is for example less than 150 μm, preferably less than 44 μητ
    Advantageously, in the first layer 85, the first powder A is mixed with an organic binder, preferably with an aqueous base, representing between 0.5% and 10%, advantageously between 0.5% and 4% by mass of the first layer 85.
    The second layer 87 advantageously comprises, at least 90% by mass, a mixture of a second powder B and a third powder C. Advantageously, the second layer 87 also comprises an organic binder, preferably with an aqueous base, representing by example between 0.5% and 10%, advantageously between 0.2% and 2% by mass of the second layer 87.
    The second powder B and the third powder C are respectively separate alloys between them, each being known to the skilled person as being suitable for brazing or recharging the materials from which the parts 49 to 55 are made. One and / or the other of these alloys is for example a nickel base alloy.
    The second powder B has a solidus temperature TSB and a liquidus temperature TLB (temperature at which the second powder B becomes fully liquid).
    The third powder C has a solidus temperature TSC, and a liquidus temperature TLC.
    The solidus temperature TSB is strictly higher than the solidus temperature TSC. The heating temperature TF is strictly higher than the solidus temperature TSC, and lower, preferably strictly, than the solidus temperature TSB.
    Thus, the third powder C at least partially melts during the heating step, while the second powder B does not melt.
    Preferably, the TLC liquidus temperature is lower, preferably strictly, than the TSB solidus temperature. In addition, the heating temperature TF is then higher, preferably strictly, than the liquidus temperature TLC. Thus, the entire third powder C is preferably melted.
    In the mixture, the second powder B represents a proportion by mass of between 60 and 95%, preferably between 70 and 90%, and even more preferably between 75 and 85%.
    For example, the third powder C comprises at least 70% by mass of nickel. Powder B is for example a nickel-based recharging powder (for example around 85%), comprising around 7.5% of chromium. Powder C is for example a nickel-based recharging powder (for example around 73%), comprising around 15% chromium.
    Thus, the TSB solidus temperature is for example 1030 ° C. The TLB liquidus temperature is for example 1060 ° C.
    The TSC solidus temperature is for example 980 ° C. The TLC liquidus temperature is for example 1020 ° C.
    The TSA solidus temperature is for example 1370 ° C. The temperature at which the first powder A is completely liquefied is for example 1400 ° C.
    The second powder B and the third powder C have for example a grain size less than 212 μm, preferably less than 105 μm.
    According to variants not shown, one and / or the other of the first layer 85 and of the second layer 87 are devoid of binder. Indeed, the presence of binder is not useful in certain situations in which the coating applied does not need to have mechanical consistency before brazing. This is for example the case when the coating R is deposited on a substantially horizontal surface.
    According to other variants, the second layer 87 is deposited on a support surface before the first layer 85.
    The solidified residue 57 is present in the interstices 61 to a depth of between 0.1 and 3 mm, preferably between 0.2 mm and 1 mm, and even more preferably between 0.3 and 0.7 mm.
    Preferably, the heating temperature TF is greater than or equal to the liquidus temperature TLC of the third powder C, that is to say greater than or equal to 1020 ° C. in the example described.
    In practice, at least half, by mass, of the third powder C is melted, and preferably, as explained above, all of the third powder C.
    The operation of the exchanger 1 is deduced from its structure and will now be briefly described.
    The cold fluid F1 (Figure 1) enters the organ 7. The cold fluid F1 flows along the lateral face 31 of the matrix 5 and is divided into the flows F11, F12 and F13 (Figure
    2).
    The flows F11, F12 and F13 enter the matrix 5 through the inputs E1, E2, E3.
    The flow F12 passes through the cutout 73 of the sheet 43 (FIG. 5). The flow F12 first flows substantially longitudinally through the first part 75 of the cutout 73, then flows substantially transversely in the second part 77, it then enters the circulation channels 65 of the part 51 and in the channels 63 of room 53 (Figure 3). As it flows longitudinally in the distribution channels 63, 65, the cold fluid exchanges heat with the hot fluid F2 located respectively on the other side of each of the parts 51, 53, and cools. The flow F12 leaves the matrix 5 via the face 33 at the cutout 71 of the sheet 43.
    Likewise, the flows F11 and F13 flow through the matrix 5 from the lateral face 31 to the lateral face 33 by exchanging heat against the current with the flows F21 and F22.
    Once heated, the flows F11, F12, F13 become heated flows F11 ’, F12’ and F13 ’which open into the member 9 and combine to form the heated fluid F1’.
    Likewise, the hot fluid F2 penetrates into the member 11 and is divided into the flows F21 and F22 which enter the matrix 5 through the lateral face 33.
    For example, as visible in FIG. 4, the flow F21 penetrates through the cutout 73 of the sheet 41 and enters the channels 63 defined by the part 51 and in the channels 65 of the part 49. The flows F21 and F22 cool down by heat exchange through the parts 49, 51 on the one hand and 53, 55 on the other hand and emerge in the form of cooled streams F21 'and F22'. The streams F21 "and F22" combine in the member 13 to form the cooled fluid F2 ".
    Thus, thanks to the characteristics described above, the brazing process makes it possible to create the solidified residue 57 forming a tight side wall on the faces 59, 60 having the interstices 61, without capillary forces causing too great penetration of the R coating in the interstices during brazing.
    In addition, the method allows the manufacture of the exchanger 1 while minimizing the number of brazing steps. This makes it possible to obtain exchangers of small dimensions, at reduced cost, and possibly in a single brazing step.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1 Brazing or recharging process comprising the following steps:
    - Supply of at least one part (51) comprising, at least 90% by mass, a metal or a metal alloy, for example stainless steel, the part (51) comprising at least one face (59) defining a plurality of interstices (61), the interstices (61) comprising at least two opposite edges (67, 69) separated on the face (59) by a maximum distance (D) less than or equal to 250 micrometers, preferably less or equal to 150 micrometers,
    - Obtaining a coating (R) in contact with said face (59), the coating (R) comprising at least a first layer (85) located at least partially in the interstices (61), and a second layer (87 ) adjacent to the first layer (85), the first layer (85) comprising a first powder (A) comprising, at least 90% by mass, a metal or a metal alloy and having a solidus temperature TSA, the second layer (87) comprising a mixture of a second powder (B) and a third powder (C), the second powder (B) and the third powder (C) being respectively alloys which are distinct from each other and suitable for brazing or reload the part (51), one and / or the other of these alloys being for example a nickel alloy, the second powder (B) having a TSB solidus temperature, and the third powder (C) having a temperature of solidus TSC strictly lower than the temperature of solidus TSB,
    heating of the part (51) and of the coating (R) to a heating temperature (TF), on the one hand, strictly lower than the solidus temperature TSA, and, on the other hand, lower, preferably strictly, at the solidus temperature TSB, and strictly higher than the solidus temperature TSC, and at least partial melting of the coating (R), and
    - cooling the part (51) and the coating (R) at least partially melted, and obtaining a solidified residue (57) fixed on the part (51).
    [2" id="c-fr-0002]
    2, -The method of claim 1, wherein the first powder (A) comprises, at least 90% by mass, the same metal or the same metal alloy as the part (51).
    [3" id="c-fr-0003]
    3. - Method according to claim 1 or 2, wherein the second powder (B) represents, in said mixture, a proportion by mass of between 60% and 95%, of
    13 preferably between 70% and 90%, and even more preferably between 75% and 85%, said proportion by mass being understood before mixing.
    [4" id="c-fr-0004]
    4. - Method according to any one of claims 1 to 3, wherein the third powder (C) comprises at least 70% by mass of nickel.
    [5" id="c-fr-0005]
    5. - Method according to any one of claims 1 to 4, wherein the solidified residue (57) extends into said interstices (61) to a depth between 0.1 mm and 3 mm, preferably between 0.2 mm and 1 mm, and even more preferably between 0.3 and 0.7 mm.
    [6" id="c-fr-0006]
    6. - Method according to any one of claims 1 to 5, in which:
    the first powder (A) has a grain size of less than 150 micrometers, preferably less than 44 micrometers,
    - The second powder (B) and the third powder (C) have a grain size less than 212 micrometers, preferably less than 105 micrometers.
    [7" id="c-fr-0007]
    7. - Method according to any one of claims 1 to 6, wherein, in the obtaining step:
    - The first layer (85) and the second layer (87) respectively comprise an organic binder, preferably with an aqueous base, the binders representing respectively between 0.5% and 4% by mass of the first layer (85), and between 0 , 2% and 2% by mass of the second layer (87).
    - the first layer (85) is applied to the part (51) and the second layer (87) is applied to the first layer (85), the second layer (87) optionally covering at least part of the part (51) not covered by the first layer (85), and
    - optionally the coating (R) is compacted under a pressure of 0.1 to 6 bars, preferably under a pressure of about 1 bar.
    [8" id="c-fr-0008]
    8. - Method according to any one of claims 1 to 7, wherein the part (51) is configured to form at least part of a heat exchanger (1), the part (51) preferably comprising at least one metal sheet (58) folded in accordion fashion, the metal sheet (58) defining a plurality of circulation channels (63, 65) for at least two fluids (F1, F2) intended to circulate on each side of the sheet
    14 metallic, each circulation channel (63, 65) having an end defining one of the interstices (61) of said face (59).
    [9" id="c-fr-0009]
    9. - Method according to any one of claims 1 to 8, wherein the solidified residue (57) completely closes said interstices (61).
    [10" id="c-fr-0010]
    10. -Method according to any one of claims 1 to 9, wherein, the third powder (C) having a TLC liquidus temperature, the heating temperature (TF) is greater than or equal to the TLC liquidus temperature.
    [11" id="c-fr-0011]
    11. - Heat exchanger (1) comprising:
    - At least one piece (51) of stainless steel, the piece comprising at least one face (59) defining a plurality of interstices (61), the interstices (61) comprising at least two opposite edges (67, 69) separated by a maximum distance (D) of less than or equal to 250 micrometers, preferably less than or equal to 150 micrometers, the part (51) preferably comprising at least one metal sheet (58) folded in accordion, the metal sheet (58) defining a plurality of circulation channels (63, 65) for at least two fluids (F1, F2) intended to circulate on each side of the metal sheet (58), each circulation channel (63, 65) having an end defining one interstices (61) of said face (59), and
    - at least one solidified residue (57) fixed on the part (51), the solidified residue (57) capable of being obtained by a process according to any one of claims 1 to
    10.
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    FR2933015A1|2010-01-01|Assembling a first part and a second part by brazing, comprises applying an assembling agent on the first part, placing the two parts against one another, and transferring the agent through the first part for assembling the two parts
    EP1019665A1|2000-07-19|Plates of an array of heat transfer plates
    FR2953919A1|2011-06-17|BRASE ALUMINUM HEAT EXCHANGER
    EP3887743A1|2021-10-06|Method for manufacturing a heat exchanger or a heat pipe
    FR3106769A1|2021-08-06|Manufacturing process of a heat exchanger or a heat pipe
    FR3095692A1|2020-11-06|Element for heat exchanger or heat pipe, and method of manufacture
    US11280555B2|2022-03-22|Method for brazing or refilling a part with micro-interstices, and heat exchanger obtained with such a method
    EP2059364B2|2017-08-16|Brazing method with application of brazing flux on one side of a section of a flat tube for a heat exchanger
    EP3762670A1|2021-01-13|Heat exchanger and method for manufacturing such a heat exchanger
    EP3394546B1|2019-11-13|Heat exchanger, in particular for a motor vehicle
    EP3394544B1|2020-01-08|Heat exchanger, in particularl for a motor vehicle
    FR3104048A1|2021-06-11|MANUFACTURING PROCESS OF A TITANIUM HEAT EXCHANGER
    FR2531645A1|1984-02-17|METHOD FOR THE UNAVAILABLE ASSEMBLY OF SEPARATE CONSTRUCTION ELEMENTS AND HEAT EXCHANGER BLOCK MADE THEREBY
    FR2883783A1|2006-10-06|Motor vehicle heat exchanger is made from brazed aluminum alloy components that are compressed to form homogeneous contact surfaces for brazing
    同族专利:
    公开号 | 公开日
    EP3630403A1|2020-04-08|
    CN110691666B|2021-07-23|
    WO2018219661A1|2018-12-06|
    CN110691666A|2020-01-14|
    FR3066935B1|2019-06-28|
    JP2020521640A|2020-07-27|
    EP3630403B1|2021-03-17|
    US20200173727A1|2020-06-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH0679446A|1992-09-07|1994-03-22|Mitsubishi Electric Corp|Manufacture of air preheater for combustor|
    US20010032715A1|2000-04-21|2001-10-25|New Century Technology Co., Ltd.|Method of manufacturing combination heat-sink and heat-sink made thereby|
    FR3028023A1|2014-10-29|2016-05-06|Fives Cryo|CORROSION RESISTANT HEAT EXCHANGER MATRIX AND METHOD FOR MANUFACTURING SUCH MATRIX|WO2020221748A1|2019-04-30|2020-11-05|Stiral|Element for a heat exchanger or heat pipe, and manufacturing method|
    FR3106769A1|2020-02-05|2021-08-06|Stiral|Manufacturing process of a heat exchanger or a heat pipe|JPH10213392A|1997-01-30|1998-08-11|Sanden Corp|Heat exchanger and its manufacture|
    FR2781706B1|1998-07-30|2000-08-25|Air Liquide|METHOD OF BRAZING BY REFUSION OF ELECTRONIC COMPONENTS AND BRAZING DEVICE FOR CARRYING OUT SUCH A METHOD|
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    JP5610714B2|2009-06-24|2014-10-22|株式会社Uacj|Aluminum alloy heat exchanger|
    US8991480B2|2010-12-15|2015-03-31|Uop Llc|Fabrication method for making brazed heat exchanger with enhanced parting sheets|CN109732165A|2019-02-22|2019-05-10|常州爱克普换热器有限公司|Heat exchanger wing plate vacuum brazing technique|
    法律状态:
    2018-03-30| PLFP| Fee payment|Year of fee payment: 2 |
    2018-12-07| PLSC| Search report ready|Effective date: 20181207 |
    2020-05-14| PLFP| Fee payment|Year of fee payment: 4 |
    2021-05-14| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1754864|2017-06-01|
    FR1754864A|FR3066935B1|2017-06-01|2017-06-01|METHOD FOR BRAZING OR RECHARGING A MICRO-INTERSTICE PIECE, AND THERMAL EXCHANGER OBTAINED BY SUCH A METHOD|FR1754864A| FR3066935B1|2017-06-01|2017-06-01|METHOD FOR BRAZING OR RECHARGING A MICRO-INTERSTICE PIECE, AND THERMAL EXCHANGER OBTAINED BY SUCH A METHOD|
    EP18723550.2A| EP3630403B1|2017-06-01|2018-05-17|Method for brazing or refilling a part with micro-interstices, and heat exchanger obtained with such a method|
    PCT/EP2018/062864| WO2018219661A1|2017-06-01|2018-05-17|Method for brazing or refilling a part with micro-interstices, and heat exchanger obtained with such a method|
    JP2020517265A| JP2020521640A|2017-06-01|2018-05-17|Method for brazing or filling components with fine gaps and heat exchanger obtained by the method|
    CN201880035673.7A| CN110691666B|2017-06-01|2018-05-17|Method for brazing or backfilling a component with micro-voids and heat exchanger obtained with the same|
    US16/618,022| US11280555B2|2017-06-01|2018-05-17|Method for brazing or refilling a part with micro-interstices, and heat exchanger obtained with such a method|
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