Method for producing sintered silicon carbide product

Details Method for producing sintered silicon carbide product Method for producing sintered silicon carbide product

1986-05-22

1988-09-13

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 90, C04B 3536

Patent

active

047708298

ABSTRACT:
A method for producing wear-resistant sintered silicon carbide products as provided herein in which 90 to 50 wt. % of .beta.-SiC having an average particle diameter of not more than one micron is mixed with 10 to 50 wt. % of .alpha.-SiC having an average particle size which is not more than one micron but not less than 1.15 times as large as that of the .beta.-SiC, and wherein tar pitch and a boron compound are added as densification aids to the powdery SiC mixture; the amount of the tar pitch being present in an amount necessary to provide the total carbon content of the powdery SiC mixture, and in a range of 4 wt. % to less than 8 wt. %; and wherein the boron compound is present in an amount of 0.03 wt. % to less than 0.15 wt. % as boron, based upon the powdery SiC mixture and wherein the resulting mixture is molded and sintered at a temperature of from 2050.degree. to 2300.degree. C. in an inert atmosphere. The molded products are superior in mechanical strength and wear resistance as opposed to conventional sintered silicon carbide products.

REFERENCES:
patent: 4041117 (1977-08-01), Prochazka
patent: 4312954 (1982-01-01), Coppola et al.
Chemical Abstracts, vol. 99, No. 18, 1983, p. 301, 144921t.

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