Method of producing sintered silicon nitrides

Details Method of producing sintered silicon nitrides Method of producing sintered silicon nitrides

1993-07-14

1995-02-28

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 501 97, 501 98, C04B 3558

Patent

active

053940156

ABSTRACT:
The invention provides a method of producing sintered silicon nitrides having such strength characteristics as are sufficient to insure satisfactory reliability of the sintered silicon nitride for use in applications such as automotive engine parts and bearings. The method comprises preparing a sintering aid by blending yttrium oxide, spinel, and aluminum oxide and/or aluminum nitride together in such proportions in terms of molar ratios of metal elements that Y/(Al+Mg) is 0.23 to 0.85 and Al/Mg is 2.1 to 5.2, mixing 5.0 to 13.0% by weight of the sintering aid with 87.0 to 95.0% by weight of a silicon nitride powder having an .alpha. crystallinity of not less than 60%, and, after the resulting powder mixture is molded into shape, sintering the molded piece at temperatures of 1400 to 1650.degree. C. in a nitrogen gas atmosphere or in an inert gas atmosphere containing nitrogen gas.

REFERENCES:
patent: 3950464 (1976-04-01), Masaki
patent: 4327187 (1982-04-01), Komatsu et al.
patent: 4624808 (1986-11-01), Lange

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