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USE OF FIRED FIBROUS GRAPHITE IN FABRICATING POLYCRSTALLINE DIAMOND AND/OR CUBIC BORON NITRIDE/SILICON CARBIDE/SILICON COMPOSITE BODIES
USE OF FIRED FIBROUS GRAPHITE IN FABRICATING POLYCRSTALLINE DIAMOND AND/OR CUBIC BORON NITRIDE/SILICON CARBIDE/SILICON COMPOSITE BODIES
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机译:火成纤维状石墨在制造多晶金刚石和/或立方氮化硼/碳化硅/硅复合体中的应用
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摘要
Disclosed is an improvement in a process for fabricating a polycrystalline diamond and/or cubic boron nitride-silicon carbide-silicon composite body fabricated by infiltrating silicon through a mixture of a carbonaceous material and non-diamond carbon coated diamond and/or cubic boron nitride under partial vacuum at elevated temperature. Such improvement comprises providing fibrous graphite for inclusion in the mixture, said fibrous graphite being subjected to heat treatment at a temperature of between about 800 DEG and 1700 DEG C. prior to its inclusion in the mixture and at a temperature of between about 800 DEG and 1550 DEG C. after its inclusion in the mixture. Such heat treatment is conducted under a total pressure of less than about 1 Torr. The vacuum silicon infiltration then is practiced on the mixture which includes the heat treated graphite fibers.
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