Method of densifying a reaction bonded silicon nitride article

Details Method of densifying a reaction bonded silicon nitride article Method of densifying a reaction bonded silicon nitride article

1979-09-24

1981-08-25

Parrish, John

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

106 735, 264 86, 264325, 264537, C04B 3558

Patent

active

042858950

ABSTRACT:
A method of densifying a reaction bonded silicon nitride article is disclosed. In accordance with the broadest principles disclosed, a densification aid is incorporated into a reaction bonded silicon nitride article. The so-made reaction bonded silicon nitride article is enclosed in a chamber which also contains a mixture of silicon nitride powder and powder the same as the densification aid incorporated into the reaction bonded silicon nitride article. The reaction bonded silicon nitride article, and the powder mixture associated therewith, is subjected to a nitrogen gas pressure sufficient to prohibit a significant volatilization of silicon nitride at a sintering temperature. The reaction bonded silicon nitride article, the powder mixture and nitrogen gas associated therewith are heated to a temperature above 1700.degree. C. for a time sufficient to permit sintering of that article whereby the strength of the reaction bonded silicon nitride article is increased. In accordance with preferred teachings, the densification aid can be selected from the group of materials consisting of magnesium oxide, yttrium oxide, cerium oxide and zirconium oxide.

REFERENCES:
patent: 3992497 (1976-11-01), Terwilliger
patent: 4038092 (1977-07-01), Baumgartner
patent: 4071372 (1978-01-01), Bird
patent: 4112143 (1978-09-01), Adlerborn
patent: 4119690 (1978-10-01), Prochazka
patent: 4179486 (1979-12-01), Lange
Mitomo et al., "Sintering of Si.sub.3 N.sub.4 ", Cer. Bull., vol. 55, No. 3, p. 313, Mar. 1976.
Priest et al., "Sintering of Si.sub.3 N.sub.4 under High Nitryene Pressure", Jan. 1977, p. 81.

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