0'-Phase sialon ceramic product and a method of forming dense ce

Details 0'-Phase sialon ceramic product and a method of forming dense ce 0'-Phase sialon ceramic product and a method of forming dense ce

1984-02-10

1985-03-19

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 65, 423327, 423344, 501152, C04B 3558

Patent

active

045060215

ABSTRACT:
A silicon aluminium oxynitride product having the crystal lattice structure of silicon oxynitride but of expanded cell dimensions is produced by sintering a powder mixture of 50 to 60 wt % of Si.sub.3 N.sub.4, 22 to 35 wt % SiO.sub.2, 1 to 20 wt % Al.sub.2 O.sub.3 and 1 to 15 wt % of at least one oxide of Y, Li, Mg, Ca, Sc, Ce or another rare earth element, the molar ratio of SiO.sub.2 to Si.sub.3 N.sub.4 being greater than 1:1 and the percentages being based on the total weight of the ingredients. Sintering is effected at 1600.degree. to 1900.degree. C. in a non-oxidizing atmosphere so that the Al.sub.2 O.sub.3, said at least one oxide and part of the SiO.sub.2 in the mixture react to form a liquid phase from which silicon aluminium oxynitride having an expanded silicon oxynitride crystal lattice is crystallized. The sintered material is cooled to form a product containing said silicon aluminium oxynitride and at least one grain boundary phase containing silicon and the metal(s) of said at least one oxide.

REFERENCES:
patent: 4127416 (1978-11-01), Lumby et al.
patent: 4143107 (1979-03-01), Ishii et al.
patent: 4331771 (1982-05-01), Washburn
Jack, K. H. "Review: Sialons and Related Nitrogen Ceramics" J. Maier, Sci. 11(1976), pp. 1135-1158, Fig. 11.

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