Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1990-09-18
1992-09-01
Hunt, Brooks H.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75232, 75234, 75235, 75236, 75237, 75238, 75241, 75242, 75244, 501 87, 501 88, 501 89, 501 90, 501 92, 501 93, 501108, 501127, 501134, 501128, C22C 2912, C22C 2906, C22C 2914, C04B 3552
Patent
active
051435403
ABSTRACT:
Substantially dense, void-free ceramic-metal composites are prepared from components characterized by chemical incompatibility and non-wetting behavior. The composites have a final chemistry similar to the starting chemistry and microstructures characterized by ceamic grains similar in size to the starting powder and the presence of metal phase. A method for producing the composites requires forming a homogeneous mixture of ceramic-metal, heating the mixture to a temperature that approximates but is below the temperature at which the metal begins to flow and pressing the mixture at such pressure that compaction and densification of the mixture occurs and an induced temperature spike occurs that exceeds the flowing temperature of the metal such that the mixture is further compacted and densified. The temperature spike and duration thereof remains below that at which significant reaction between metal and ceramic occurs. The method requires pressures of 60-250 kpsi employed at a rate of 5-250 kpsi/second.
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McDonald Robert R.
Pecnenik Alexander
Pyzik Aleksander J.
Snyder, Jr. Irving G.
Hunt Brooks H.
Jenkins Daniel J.
The Dow Chemical Company
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