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Method of making sintered powder alloy compacts

  • US 4,382,818 A
  • Filed: 08/31/1978
  • Issued: 05/10/1983
  • Est. Priority Date: 12/08/1975
  • Status: Expired due to Term
First Claim
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1. A method of establishing alloying between solid and liquid phases of a powder mixture, comprising:

  • (a) uniformly blending an iron based powder, devoid of alloying ingredients and having less than 1% impurities, with a prealloyed non-iron based additive powder devoid of alloyed carbon to form a mixture, said additive powder consisting of at least two elements, but up to all elements selected from the group consisting of manganese, molybdenum, nickel, chromium, copper and iron, molybdenum being in the range of 5-15% by weight when selected along with the absence of copper, said elements being selected and balanced to provide in step (c) a span of melting temperatures for said admixture of elements of no greater than 350°

    F. and the admixture having a liquidus temperature of between 1900°

    F.-2250°

    F., said additive powder being preset in an amount of 0.25-6% of said mixture,(b) adding a predetermined amount of graphite powder to said mixture to render 0.81% carbon or less and to render a predetermined hardenability response upon heating in step (c), and(c) heating said mixture to a predetermined temperature and for a period of time to allow the additive powder to completely form a liquid phase which readily diffuses along the particle boundaries and into the matrix of said iron powder thereby reducing the maximum diffusion distance to one particle radius or less and provides for a homogeneous microstructure.

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