Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1989-04-13
1990-04-03
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
419 2, 419 17, C22C 2902
Patent
active
049137387
ABSTRACT:
A heat-resistant composite body comprising a composite body of silicon carbide and metallic silicon, the metallic silicon existing in the porous silicon carbide sintered body. The silicon carbide particles constituting the silicon carbide sintered carbide sintered body have an average particle diameter of 5 .mu.m or less, and at least a part of the silicon carbide particles is present in the sintered body in the form of porous secondary particles bonded together. The interconnected pores comprise (i) a group of fine pores having a pore diameter of 3 .mu.m or less, constituted of fine crystalline silicon carbide particles having an average diameter of 5 .mu.m or less and (ii) a group of relatively coarse pores having a pore diameter of from 15 to 40 .mu.m, constituted of porous secondary particles which are bonded to have an average particle diameter of from 40 .mu.m to 150 .mu.m and have a particle size distribution such that 60% by weight or more of particles are included in .+-.20% of the average particle diameter. The metallic silicon is in an amount of from 45 to 140 parts by weight based on 100 parts by weight of the silicon carbide and fills the interconnected pores.
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Ibiden Co. Ltd.
Lechert Jr. Stephen J.
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