Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1981-02-09
1983-08-30
Parrish, John A.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
501 87, C04B 3558
Patent
active
044016174
ABSTRACT:
A method is disclosed comprising placing in a hot pressing environment a controlled mixture of a first powder of Si.sub.3 N.sub.4 containing a controlled amount of SiO.sub.2 (with or without a limited amount of milling media) with a second powder consisting essentially of Y.sub.2 O.sub.3, hot pressing the controlled mixture, and cooling the resultant unitary object.
A novel silicon nitride comprising a unitary object is disclosed which can be shaped to form a novel cutting tool useful for machining metal such as cast iron. The object has selected crystalline phases formed beta Si.sub.3 N.sub.4 and beta prime Si.sub.3 N.sub.4 and as intergranular crystalline secondary phases consisting essentially of YSiO.sub.2 N, y.sub.10 Si.sub.17 N.sub.4 O.sub.23 and Y.sub.2 Si.sub.2 O.sub.7 with the YSiO.sub.2 N phase representing at least a 25% volume fraction of the secondary phases and comprising essentially all of the yittria-silicon oxide.
REFERENCES:
patent: 3830652 (1974-08-01), Gazza
Smith, "Temperature and Compositional Stability of a Y.sub.6 Si.sub.6 O.sub.21 Phase in Oxidized Si.sub.3 N.sub.4 ", Oct. 1977, pp. 465-466.
Ezis Andre
Samanta Shyam K.
Subramanian Krishnamoorthy
Ford Motor Company
Johnson Olin B.
Malleck Joseph W.
Parrish John A.
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