• 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:
    An improvement in a powder metallurgic manufacturing process where metal powder is compressed and heated in a mould and heat is produced by conducting electric current through the mould and the metal powder as well as through at least one electrically resistive fireproof body in actual contact with the mould where heat produced in the body is transferred to the mould and the metal powder. The improvement comprises maintaining electric tension between 2 and 200 volts; the current efficiency per unit volume of the mould between 20 and 200 W/cm3; and the resistivity of the electrically resistive fireproof body between 0.03 and 100 ohm x cm.
    公开号:SU730285A3
    申请号:SU762431201
    申请日:1976-12-22
    公开日:1980-04-25
    发明作者:Арвела Аукусти
    申请人:Л.А.Леванто Ой (Фирма)；
    IPC主号:
    专利说明:

    one
    The invention relates to the field of powder metallurgy, in particular, to methods for the manufacture of products by hot pressing of meta-metal porosities.
    There is a method of hot pressing metal powders, which includes heating the powder in a metaplastic mold and then pressing the heated powder 1. The disadvantages of this method are the limited extrusion temperatures and pressures, which is caused by a decrease in the strength of the mold while increasing the temperature.
    The closest to the proposed invention to the technical essence and the achieved result is a method of hot pressing, which includes loading the powder into the mold, heating the powder by passing an electric current through the mold and pressing the heated porous aka. The mold is made of. high strength graphite 2.
    , The disadvantages of this method are related to the Ltc. The unevenness of the heating mold and the need to pass a current of considerable force, which is due to the low electrical resistance of graphite.
    In order to increase heating uniformity and reduce the current intensity
    5 powder is carried out using refractory elements installed in the mold, moreover, these elements are made of a mixture of graphite and concrete, and the components of the mixture are taken in
    10 sleduk dem ratio, wt.%: Graphite15-40
    Refractory concrete the Rest of the Method is carried out in the following manner,
    W Hydraulically or chemically bonded concrete, the binder of which is cement, water glass or phosphoric acid, and the base material is asbestos, is mixed
    2D in a predetermined proportion with the graphite, brought to solidification, and then thoroughly dried. Resistive refractory elements made from this mixture are placed on the end surfaces of the mold, and then electric current is passed. Due to the fact that the refractory elements have an increased electrical resistance, a significantly smaller current is sufficient to heat them than using a known method. In this case, the voltage rises to 2–200 V, which makes it possible to use a welding machine as a power source. Heating of the mold in this case becomes controllable, which makes it possible to increase the uniformity of heating of the metal powder placed in the mold.
    权利要求:
    Claims (2)
    [1]
    1. The method of hot pressing of powdered powders, including loading into the mold, heating the powder by passing an electric current through the mold and pressing the heated powder, characterized in that, in order to increase the uniform heating and decrease the current, the powder is heated help refractory elements installed in the mold.
    [2]
    2. Method of pop, 1, characterized in that the refractory elements are made of a mixture of graphite and refractory concrete, while the components of the mixture are in the following ratio, wt.%:
    Graphite15-40
    Fireproof Concrete Rest
    Sources of information taken into account in the examination
    1. US patent W 3606637, 5 cl. 18-16, published. 1968.
    2. Hayt S., Trans, Amer tJnst. Mln met. Eng. 1930, V. 89, p. 9-58.
    类似技术:
    公开号 | 公开日 | 专利标题
    US2057431A|1936-10-13|Method of making resistance elements
    SU730285A3|1980-04-25|Method of hot pressing of metallic powders
    RO118456B1|2003-05-30|Copper-graphite composite material with low electric resistance and improved resistivity to wear and process for producing the same
    UA41447C2|2001-09-17|Method of continuous production of self-sintered electrode and device for continuous production of self-sintered electrode
    US1111698A|1914-09-22|Process for the manufacture of ductile bodies of high-fusing metals and alloys of the same.
    US3405205A|1968-10-08|Method of uniformly heating an annular carbonaceous body
    US3296021A|1967-01-03|Heat-resistant and oxidationproof materials
    US1894685A|1933-01-17|Electrical resistor and manufacture thereof
    US1765572A|1930-06-24|Process for producing electrical resistance elements and the like
    US1613426A|1927-01-04|Process of producing electrical heating element
    SU582909A1|1977-12-05|Method of making sintered articles
    US1135182A|1915-04-13|Method of producing heat-resisting bodies.
    US3320059A|1967-05-16|Voltage-pressure bonding
    SU558759A1|1977-05-25|Method of making sintered products
    US1381748A|1921-06-14|Manufacture of agglomerates of various materials and their utilization
    SU581362A1|1977-11-25|High-frequency furnace for heating dielectric materials
    JPS55140707A|1980-11-04|Carbon sintering method
    SU386708A1|1973-06-21|METHOD OF MANUFACTURING METAL-CERAMIC PRODUCTS
    SU73176A2|1947-11-30|Method of briquetting bulk materials
    SU1197870A1|1985-12-15|Press mould for hot pressing of refractory powders
    US3505438A|1970-04-07|Method of hot pressing titanium diboride utilizing a growing sintered zone
    US819625A|1906-05-01|Electric muffle.
    US1323623A|1919-12-02|Pbocess of producing dense metal rods of fine powders
    JP2000239709A|2000-09-05|Direct energization sintering method and device
    US1010866A|1911-12-05|Process of making composite conductors.
    同族专利:
    公开号 | 公开日
    FI53085B|1977-10-31|
    SE413635B|1980-06-16|
    AU2082576A|1978-06-29|
    CA1082008A|1980-07-22|
    AU501633B2|1979-06-28|
    SE7614028L|1977-06-24|
    FI53085C|1978-02-10|
    ZA767634B|1977-11-30|
    US4102679A|1978-07-25|
    FI753648A|1977-06-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1896854A|1930-06-19|1933-02-07|Gen Electric|Apparatus for making hard metal compositions|
    US1896853A|1930-09-22|1933-02-07|Gen Electric|Welding process|
    US2089030A|1933-04-09|1937-08-03|Kratky Anton|Method for the production of bodies of extreme hardness|
    US2149596A|1936-06-08|1939-03-07|Bunting Brass & Bronze Company|Method for producing metallic material|
    US2133495A|1937-02-15|1938-10-18|Fay H Willey|Method of making a hard and compact metal for use in formation of tools, dies, etc.|
    US2195297A|1938-11-04|1940-03-26|Carboloy Company Inc|Method and apparatus for making hot pressed hard metal compositions|
    US2372605A|1941-11-04|1945-03-27|Fellows Gear Shaper Co|Method and apparatus for making solid objects from metal powder|
    US2355954A|1942-03-04|1944-08-15|Hardy Metallurg Company|Powder metallurgy|
    US3069261A|1957-10-25|1962-12-18|Globe Union Inc|Method of making porous metal bodies|
    US2938998A|1959-04-03|1960-05-31|Wendell B Wilson|High pressure dies|
    US3445625A|1964-09-03|1969-05-20|Varian Associates|Method for making porous low density metal member from powdered metal|
    GB1220376A|1967-05-04|1971-01-27|Hiroshi Ishizuka|Improvements in or relating to a high temperature high pressure apparatus|
    JPS503025B1|1969-03-10|1975-01-30|
    US3665151A|1969-07-24|1972-05-23|Us Navy|Apparatus for preventing carbon diffusion in electric discharge sintering|
    US3778586A|1970-04-02|1973-12-11|Composite Sciences|Process for coating metals using resistance heating of preformed layer|JPS5852528B2|1979-04-10|1983-11-24|Katsuragi Sangyo Kk|
    SE442487B|1984-05-24|1986-01-13|Hoeganaes Ab|PROCEDURE FOR PREPARING A SINTRAD COMPOSITE BODY|
    US5122043A|1990-12-06|1992-06-16|Matthews M Dean|Electric pulsed power vacuum press|
    DE4407593C1|1994-03-08|1995-10-26|Plansee Metallwerk|Process for the production of high density powder compacts|
    KR100373741B1|2000-07-21|2003-02-26|주식회사일진|A process for producing porous aluminum using the pressure-assisted current sintering|
    AU2005274881B2|2004-07-19|2011-11-03|Smith & Nephew, Inc.|Pulsed current sintering for surfaces of medical implants|
    DE102017106473A1|2017-03-27|2018-04-19|Schaeffler Technologies AG & Co. KG|Hydraulic camshaft adjuster|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI753648A|FI53085C|1975-12-23|1975-12-23|
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