Method of protecting Si.sub.3 N.sub.4 ceramic alloy during heati

Details Method of protecting Si.sub.3 N.sub.4 ceramic alloy during heati Method of protecting Si.sub.3 N.sub.4 ceramic alloy during heati

1978-07-21

1979-12-18

McCarthy, Helen M.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

106 732, 106 735, C04B 3558, C04B 3550

Patent

active

041794869

ABSTRACT:
Articles made from Si.sub.3 N.sub.4 ceramic alloy powders are protected during heating by loosely packing them in Si.sub.3 N.sub.4 before heating. Compacts made from Si.sub.3 N.sub.4 ceramic alloys are protected from both oxidation and from volatilization by the encompassing powder even though the furnace atmosphere is air.

REFERENCES:
patent: 3969125 (1976-07-01), Komeya et al.
patent: 3983198 (1976-09-01), Mangels
patent: 4101616 (1978-07-01), Buljan
patent: 4112143 (1978-09-01), Adlerborn et al.
patent: 4143107 (1979-03-01), Ishii et al.
Crandall, W. B. et al., "Preparation and Evaluation of Si-Al-O-N", -IIT Research Inst. (1974)-Aerospace Research Labs (ARW 74-0099), pp. 16-18, pp. 43-44.

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