Sintering and Microstructure Formation of β-Silicon Carbide

The effect of additions of B, Al, and B + Al on the pressureless sintering of β‐Sic was examined. The influence of the sintering atmosphere and heating schedule on densification behavior, polytype transformation, and microstructure development was also studied. High densities were obtained at 1940°C...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1985-09, Vol.68 (9), p.479-482
Main Authors: STUTZ, DORIS H., PROCHAZKA, SVANTE, LORENZ, JOSEF
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Refractory products
Special refractories
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Summary:The effect of additions of B, Al, and B + Al on the pressureless sintering of β‐Sic was examined. The influence of the sintering atmosphere and heating schedule on densification behavior, polytype transformation, and microstructure development was also studied. High densities were obtained at 1940°C by the simultaneous addition of B and Al. The decrease in the sintering temperature is attributed to the presence of a liquid phase which results in the formation of platelets (up to 200 # in size) of an α‐polytype, predominantly 4H and 6H. Polytype transformation and exaggerated grain growth could be prevented by annealing the compact at 1650° to 18500°C for 0.5 to 1 h. This procedure results in a better redistribution of the sintering aids, giving a fine‐grained microstructure, constituted primarily of the cubic 3C polytype.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1985.tb15812.x