Method of preparing powder ingredients by dry milling for subseq

Details Method of preparing powder ingredients by dry milling for subseq Method of preparing powder ingredients by dry milling for subseq

1984-07-12

1986-07-15

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

241 15, 241 22, 252 56R, 264109, B28B 100

Patent

active

046005471

ABSTRACT:
A method of making a compacted body useful in the fabrication of an improved, fully densified silicon nitride ceramic is disclosed. Silicon powder, oxygen carrying agents, and a dry lubricant (an aliphatic acrylate resin) are admixed. The lubricant is selected to have a low surface energy value less than 28 dyne/cm, have a glass transition temperature of -43.degree. to -82.degree. C., and a molecular weight equal to or less than 5000. The admixture is milled to a desired average particle size no greater than 35 microns. The milled mixture is then formed into a compact which can be nitrided and hot pressed to form a fully dense silicon nitride object.

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Jour. American Ceramic Society, vol. 62, No. 11, Effect of Carbon Impurity on Thermal Degradation Si.sub.3 N.sub.4 --Y.sub.2 O.sub.3.

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