Process for preparing nitrided superhard composite materials

Details Process for preparing nitrided superhard composite materials Process for preparing nitrided superhard composite materials

1981-12-16

1984-08-14

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

51293, 51307, 264 63, 264 82, C04B 3334

Patent

active

044656505

ABSTRACT:
A cutting insert having a cutting portion comprising a dispersion of diamond crystals in a matrix of .beta.-silicon carbide and silicon nitride is produced by forming a first dispersion of diamond crystals evenly coated with carbon black in a temporary binder, and forming a second dispersion of carbon fiber, carbon black and filler in a temporary binder. The first and second dispersions are compacted together to produce an intermediate composite which is heated in a vacuum furnace in order to remove the temporary binder and allow liquefied silicon to infiltrate the composite. The composite is then sintered and subjected to nitrogen, wherein elemental silicon at the surface of the composite reacts with the nitrogen to produce silicon nitride.

REFERENCES:
patent: 4171339 (1979-10-01), Lee et al.
patent: 4173614 (1979-11-01), Lee et al.
patent: 4235857 (1980-11-01), Mangels
patent: 4241135 (1980-12-01), Lee et al.
patent: 4242106 (1980-12-01), Morelock
patent: 4247304 (1981-01-01), Morelock

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