Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1991-07-08
1992-09-08
Hunt, Brooks H.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75236, 75244, 75247, C22C 2900, C22C 2902, C22C 2914, C22C 500
Patent
active
051455048
ABSTRACT:
Ceramic metal compositions are described that include a ceramic phase content of at least 60 percent by volume of said composition and a copper metal phase permeating the ceramic phase. The resulting composition is substantially fully densified, having a connected or isolated ceramic grain structure, preferably of fine B.sub.4 C grains of less than 3 micrometers. Flexure strength and fracture toughness for 80 volume percent B.sub.4 C-20 volume percent Cu cermets are 6.62 MPa.multidot.m1/2 and 725 MPa, respectively. The process of the invention includes as a key element, contacting a porous article of ceramic phase with copper metal followed by heating to above melting and subjecting said article to pressure of at least 200 MPa, such that the porous body is filled with metal and the composition is substantially fully densified.
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Nilsson Robert T.
Pyzik Aleksander J.
Hunt Brooks H.
Jenkins Daniel J.
The Dow Chemical Company
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