Method for preparing silicon nitride based ceramics

Details Method for preparing silicon nitride based ceramics Method for preparing silicon nitride based ceramics

1995-05-01

1997-02-18

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 95, 501 97, C04B 35584

Patent

active

056038771

ABSTRACT:
Si.sub.3 N.sub.4 based ceramics are prepared by molding, calcining and sintering a powder mixture of columnar-shaped Si.sub.3 N.sub.4 particles having a particular size, a minor quantity of sintering aids and equiaxed Si.sub.3 N.sub.4 particles. The ceramics have a structure containing a specific quantity of coarse columnar grains grown from the coarse columnar-shaped particles as seed crystals, and superior in wear resistance, resistance to chipping and thermal resistance, and useful as wear resistant components or cutting tools. The ceramics can be produced without recourse to hot press sintering by normal sintering or sintering under a gas pressure, or further by applying HIP.

REFERENCES:
patent: 4289952 (1981-09-01), Haggerty
patent: 4886767 (1989-12-01), Goto
patent: 4978645 (1990-12-01), Ukyo
patent: 5045513 (1991-09-01), Mizuno
patent: 5120328 (1992-06-01), Pyzik
patent: 5225127 (1993-07-01), Nishioka et al.
P. Sajgalik, Journal of the European Ceramic Society, "Reinforcement of Silicon Nitride Ceramics by .beta.-Si.sub.3 N.sub.4 Whiskers", vol. 5, No. 5, 1989, pp. 321-326.
J. Homeny et al., Journal of the American Ceramic Society, "Mechanical Properties of .beta.-Si.sub.3 N.sub.4 -Whisker/Si.sub.3 N.sub.4 -Matrix Composites", vol. 73, No. 11, 1990, pp. 3493-3496.

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