• 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:
    1. Method for casting aluminum alloys which contain more aluminium than corresponds to the eutectic mixture with the alloy partners to achieve improved strength values by reducing the spacings of the secondary dendrite arm spacings formed by solidification, characterized in that the inner wall of the casting mould is produced with large numbers of roughnesses in the micro-range, in that the inner wall is provided with a thin layer of a salt mixture, the cations of the salt mixture consisting predominantly of those of the alkali and/or alkaline-earth metals and its anions consisting prominently of those of the halogens, and in that the liquidus temperature of the salt mixture is set lower than the casting temperature of the aluminium alloy.
    公开号:SU1760973A3
    申请号:SU864027428
    申请日:1986-04-02
    公开日:1992-09-07
    发明作者:Юрген Бер Фридрих；Конрад Баллевски Хайнрих；Гроссманн Вольфганг
    申请人:Тиссен Индустри Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the production of castings from aluminum alloys in shell molds.
    The purpose of the invention is to improve the mechanical properties of castings from hypoeutectic aluminum alloys.
    The method is illustrated by the following example.
    Shell multilayer forms are prepared by melted models from a water suspension with colloidal silica as a binder and with artists from finely milled less than 10 microns in diameter of zirconium silicate and silicon oxide. The layers are coated with coarse zirconium silicate powder with a grain size of 0.16 mm (100 mesh). After repeated application of the suspension, sprinkling and drying of the ceramic layers, a multilayer form with a wall thickness of 8 mm is formed. The inner surface is less than 10 μ asperities per 1 cm2. At the same time, the diameter and depth or width of the gap and the depth of asperities are no more than 3: 1.
    The mold is then placed in an autoclave and calcined at 800 ° C. In the internal cavity of the form is poured an aqueous solution of salts, for example of the following composition, in wt.%: 2L1CI; 2NaF, - 0.5 Na4Fe (CN) 6; 4NaCI; 2NaF; 0.1 methyl cellulose and 0.01 surfactant; water - the rest.
    Upon receipt of such an aqueous solution of salts, there is no need for preliminary melting or grinding of the salt mixture.
    Due to the ion exchange of sodium fluoride, which is soluble in water, lithium chloride falls into fine-grained lithium fluoride after a few hours.
    Due to the fact that the brine solution salt contains a dispersant (methylcellulose),
    H o
    About XI
    SA)
     WITH
    The fine-grained insoluble salts, which after some time are separated from the solution in the form of crystals (lithium fluoride), can be kept in a suspended state and promote uniform distribution on the inner surface of the mold.
    The salt solution is successively filled in the shell — the form and immediately poured out again.
    Then, the ceramic molds are heated to approximately 470 ° C, in a hot state they are placed in a vacuum unit and at a temperature of 250 ° C with an aluminum alloy of grade 9AISI - 7MdOe at a melt temperature of 700 ° C and a torr pressure.
    After heat treatment of the casting (diffusion annealing and thermal hardening), the following properties are obtained:
    tensile strength
    when stretched 350-360 N / mm2
    yield strength
    when stretched 290-310 n / mm
    relative
    elongation at
    gap5-7%
    Castings of aluminum alloys, obtained by the claimed method, have high strength properties and elongation
    0
    five
    by producing improved fine grain, in particular, reduced secondary portions of the dendritic structures of hypoeutectic aluminum alloys. Formula and 1. A method for the production of castings, mainly of aluminum alloys, in fordh on melted models, including the application on the working surface of the form, obtained from the suspension with granular filler, the coating layer of inorganic salts, characterized in that, in order to improve the mechanical properties of castings from hypoeutectic aluminum alloys, the inner surface of the mold is made with a roughness not
    at
    with
    less than 10 microroughness per cm
    using a filler in a suspension with a grain size less than 105 microns in diameter, and to form a cochlea from inorganic salts, a molten salt is used with a liquidus temperature not exceeding that of the aluminum alloy cast in the mold.
    2. A method according to claim 1, characterized in that the diameter and depth or width of the gap and the depth of asperities are not more than 3: 1.
    权利要求:
    Claims (2)
    [1]
    1. A method of manufacturing castings, mainly from aluminum alloys, in investment casting molds, comprising applying to the working surface of a mold obtained from a suspension with granular filler, a coating layer of inorganic salts, characterized in that, in order to improve the mechanical properties of the casts from pre-eutectic aluminum alloys, the inner surface of the mold is made with a roughness of at least 10 5 microroughnesses per cm 2 when using filler in a suspension with a grain size of less than 10 5 microns in diameter, and for I formation of a coating of inorganic salts using molten salts with a liquidus temperature not exceeding the temperature of the aluminum alloy poured into the mold.
    [2]
    2. The method of pop. / characterized in that the diameter and depth or width of the gap and the depth of the microroughness is not more than 3: 1.
    类似技术:
    公开号 | 公开日 | 专利标题
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    US2948935A|1960-08-16|Process of making refractory shell for casting metal
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    US4766948A|1988-08-30|Process for casting aluminum alloys
    US3259948A|1966-07-12|Making fine grained castings
    US2790218A|1957-04-30|Shell mold structures and processes and compositions for forming the same
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    US4108676A|1978-08-22|Mixed oxide compounds for casting advanced superalloy materials
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    JPH10156484A|1998-06-16|Mold for precision casting
    US4178187A|1979-12-11|Mixed oxide compound NdAlO3 for casting advanced superalloy materials
    US3802891A|1974-04-09|Semi-permanent refractory molds and mold parts
    US3815658A|1974-06-11|Process for making a metallurgically slow reacting mold
    同族专利:
    公开号 | 公开日
    JPS61293653A|1986-12-24|
    ES8703097A1|1987-02-16|
    IL78279D0|1986-07-31|
    DE3512118A1|1986-10-16|
    EP0198290A3|1987-06-24|
    EP0198290A2|1986-10-22|
    CA1288210C|1991-09-03|
    BR8601478A|1986-12-09|
    ZA862393B|1986-11-26|
    DE3671607D1|1990-07-05|
    ES553681A0|1987-02-16|
    EP0198290B1|1990-05-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE963642C|1944-09-30|1957-05-09|Siemens Ag|Process for influencing the surface of cast bodies|
    US3259948A|1962-04-09|1966-07-12|Howe Sound Co|Making fine grained castings|
    GB1076179A|1963-11-19|1967-07-19|Erik Rune Albin Larsson|A method for casting steel and steel alloys|
    US3157926A|1964-02-14|1964-11-24|Howe Sound Co|Making fine grained castings|
    DE1265356B|1965-02-26|1968-04-04|Henry H Harris|Mold|
    NL126286C|1965-07-29|DE3703416C2|1987-02-05|1992-01-16|Thyssen Guss Ag, 4330 Muelheim, De|
    DE3821204C2|1988-06-23|1992-08-27|Dentaurum J. P. Winkelstroeter Kg, 7536 Ispringen, De|
    DE4308614A1|1993-03-18|1994-09-22|Fritz Winter Eisengieserei Ohg|Method for producing workpieces made of cast iron, and hollow castings produced accordingly|
    GB9618216D0|1996-08-30|1996-10-09|Triplex Lloyd Plc|Method of making fine grained castings|
    FR2935275B1|2008-08-29|2011-11-04|Peugeot Citroen Automobiles Sa|LOST MODEL MOLDING PROCESS, LOST MODEL FOR THIS PROCESS|
    EP3389892B1|2015-12-18|2020-03-11|Ask Chemicals Llc|Molding materials for non-ferrous casting|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19853512118|DE3512118A1|1985-04-03|1985-04-03|METHOD FOR GENERATING AN IMPROVED FINE-NARROWNESS OF THE PRIMARY FABRIC AND / OR THE EUTEKTIKUM OF CASTING PARTS|
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