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Primary Examiner: Vertiz, O. R.
Assistant Examiner: Bell, Mark
Attorney: Malleck; Joseph W., Zerschling; Keith L.

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Title: Method of using Si.sub.3 N.sub.4.Y.sub.2 O.sub.3.SiO.sub.2 ceramic system for machining cast iron

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.

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Other info:

Inventors: Samanta, Shyam K. (Ypsilanti, MI, US)
Subramanian, Krishnamoorthy (Inkster, MI, US)
Ezis, Andre (Grosse Ile, MI, US)

Application Number: 105829
Filing Date: 1979-12-20
Publication_date: 1980-10-14
Assignee: Ford Motor Company (Dearborn, MI)
Primary Class(es): 409/131 51/308, 51/309, 82/1.11, 156/73.2, 156/73.5, 407/119, 408/1R
Other Classes:
US Patent Ref:

3830652	Aug, 1974	Gazza	106/73.
3833389	Sep, 1974	Koneya	106/55.

Other Refs: 49-113803

Oct, 1974	JP.

Other References: 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.