Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – With carbonizing – then adding carbonizable material and...
Patent
1981-02-02
1983-04-26
Derrington, James H.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
With carbonizing, then adding carbonizable material and...
51295, 264 291, 264 60, C04B 3560
Patent
active
043812716
ABSTRACT:
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.degree. and 1700.degree. C. prior to its inclusion in the mixture and at a temperature of between about 800.degree. and 1550.degree. 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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patent: 3926571 (1975-12-01), Labassier
patent: 4089931 (1978-05-01), Sharma
patent: 4148894 (1979-04-01), Hillig et al.
patent: 4220455 (1980-09-01), St. Pierre et al.
patent: 4238433 (1980-12-01), Hillig et al.
patent: 4242106 (1980-12-01), Morelock
Derrington James H.
General Electric Company
Little Douglas B.
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