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    • 5. 发明授权
    • Process for making improved net shape or near net shape metal parts
    • 改善净形状或近净形金属部件的工艺
    • US5993731A
    • 1999-11-30
    • US966041
    • 1997-11-07
    • David E. JechJuan L. SepulvedaAnthony B. Traversone
    • David E. JechJuan L. SepulvedaAnthony B. Traversone
    • B22F3/00B22F3/10B22F3/23C22C1/04C22C1/05B22F1/00
    • C22C1/05B22F3/001B22F3/10B22F3/23C22C1/045B22F2003/1042B22F2998/00B22F2998/10B22F2999/00
    • The process for producing net shape or near net shape metal parts is improved by sintering a compact in a reducing atmosphere where the compact contains a metal and chemically-bound oxygen in the form of a metal oxide, for example, and the chemically-bound oxygen is in an amount sufficient to improve the sintering of the compact. Improved sintering is facilitated when the metal oxide forms a metal/metal oxide eutectic during reduction of the chemically-bound oxygen in a reducing atmosphere during the sintering process. The compact can contain a metal oxide and a solution compound to produce an alloy part, provided the chemically-bound oxygen is present in an amount sufficient to improve sintering. In a preferred embodiment, the compact also contains a reinforcement compound and is sintered to make a metal matrix composite. The resultant density of the near net shape metal parts made by the improved sintering process is preferably about 97% or more of the theoretical density.
    • 用于制造网状或近净金属部件的方法通过在还原气氛中烧结压块而改进,其中压实体包含金属和金属氧化物形式的化学结合氧,以及化学结合的氧 其量足以改善压块的烧结。 当在烧结过程中还原气氛中的化学结合氧还原期间金属氧化物形成金属/金属氧化物共晶时,促进了烧结的改善。 只要化学结合的氧以足以改善烧结的量存在,该压块可以包含金属氧化物和溶液化合物以产生合金部件。 在优选的实施方案中,压块还包含增强化合物并烧结以制备金属基质复合材料。 通过改善烧结工艺制成的近净形金属部件的合成密度优选为理论密度的约97%以上。