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Methods for production of surface coated niobium reinforcements for intermetallic matrix composites

  • US 5,198,187 A
  • Filed: 11/20/1991
  • Issued: 03/30/1993
  • Est. Priority Date: 11/20/1991
  • Status: Expired due to Fees
First Claim
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1. In a self-propagating, high-temperature synthesis, molten metal or powder metallurgical method of forming a composite body comprising a metal, intermetallic or ceramic matrix reinforced with a member selected from the group consisting of filaments, particles, platelets and mixtures thereof composed of a material containing elemental niobium, said method comprising admixing said reinforcing member with powders of said matrix component elements, forming said admixture into a desired shape and subjecting said shaped admixture to temperature and pressure conditions sufficient to convert said powders to a metal, intermetallic or ceramic matrix reinforced with said reinforcing member, the improvement wherein:

  • said reinforcing member admixed with said powders has a surface coating thereon of a compound Nb2 O5, wherein said compound Nb2 O5 reacts in situ during formation of said matrix with a portion of at least one of said powdered elements according to the equation Nb2 O5 +Z→

    ZO+Nb, wherein Z is said at least one powdered element and the reaction product ZO forms as a barrier layer at the reinforcing member/matrix interface to prevent further reaction between said reinforcing member and said matrix component elements.

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