Preparation of dense ceramics

Details Preparation of dense ceramics Preparation of dense ceramics

1982-01-04

1983-02-08

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 88, C04B 3556

Patent

active

043729029

ABSTRACT:
The invention is concerned with preparation of dense ceramics, in particular silicon carbide.
Silicon carbide is a useful structural material but difficulties of densifying by sintering have in the past created problems in the production of silicon carbide components. It is however known to use boron and carbon as additives to assist densification by sintering. In this invention a further improvement in densification is effected by carrying out such sintering in a carbon-containing reducing atmosphere such as a methane containing atmosphere. Surface silica which inhibits densification is thereby removed but without removing fine carbon.

REFERENCES:
patent: 2784112 (1957-03-01), Nicholsen
patent: 2897572 (1959-08-01), Hansen
patent: 3407090 (1968-10-01), Hertl
patent: 4124667 (1978-11-01), Coppola
patent: 4209474 (1980-06-01), Prochazka
patent: 4224073 (1980-09-01), Sasoki
Prochazka, "The Role of Boron and Silicon in the Sinting of Silicon Carbide", Special Ceramics, Proc., vol. 6, (1975), pp. 171-181.

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