Method of making silicon nitride base cutting tools -II

Details Method of making silicon nitride base cutting tools -II Method of making silicon nitride base cutting tools -II

1979-12-20

1981-04-28

Parrish, John

Plastic and nonmetallic article shaping or treating: processes

Utilizing special inert gaseous atmosphere or flushing mold...

51307, 51309, 264332, C04B 3558

Patent

active

042645506

ABSTRACT:
A method of making a unitary silicon nitride comprising object is disclosed. A uniform powder mixture is prepared of Si.sub.3 N.sub.4 containing SiO.sub.2 as an oxide surface coating, 4-12% by weight Y.sub.2 O.sub.3, and 0.50-2.5% Al.sub.2 O.sub.3. The mixture is heated to 1000.degree.-1400.degree. C. under a pressure of at least 2,000 psi for a time of at least one minute but sufficient to permit a nucleating reaction to take place in secondary phases. Heating is then increased to a temperature of 1680.degree.-1750.degree. C. under a pressure and for a period of time sufficient to produce 99.0% or more of full theoretical density in the pressed object.

REFERENCES:
patent: 3830652 (1974-08-01), Gazza
patent: 3837871 (1974-09-01), Weaver
patent: 3950464 (1976-04-01), Masaki
patent: 3969125 (1976-07-01), Komeya et al.
patent: 4071371 (1978-01-01), Milberg et al.
patent: 4102698 (1978-07-01), Lange et al.
patent: 4143107 (1979-03-01), Ishii

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