Method of using Si.sub.3 N.sub.4.Y.sub.2 O.sub.3.SiO.sub.2 ceram

Details Method of using Si.sub.3 N.sub.4.Y.sub.2 O.sub.3.SiO.sub.2 ceram Method of using Si.sub.3 N.sub.4.Y.sub.2 O.sub.3.SiO.sub.2 ceram

1979-12-20

1980-10-14

Vertiz, O. R.

Gear cutting, milling, or planing

Milling

Process

82 1C, 106 732, 106 735, 51308, 51309, 408 1R, 407119, B23C 100, C04B 3558, C04B 3550

Patent

active

042278422

ABSTRACT:
A process for continuous or interrupted machine cutting of solid cast iron by milling, turning or boring with a shaped tool, wherein said shaped tool is a ceramic consisting essentially of Si.sub.3 N.sub.4 and 4-12% by weight Y.sub.2 O.sub.3, produced by hot pressing at a pressure and a temperature of 1700.degree.-1750.degree. C. to achieve substantially full density.

REFERENCES:
patent: 3830652 (1974-08-01), Gazza
patent: 3833389 (1974-09-01), Koneya
Smith J. T., "Temperature and Compositional Stability of a Y.sub.6 Si.sub.6 O.sub.21 Phase in Oxidized Si.sub.3 N.sub.4 ", J. Am. Ceramic Society Sep.-Oct. 1977 pp. 464-466.

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