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What is the coefficient of thermal expansion of silicon carbide?

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What is the coefficient of thermal expansion of silicon carbide?

(a) 9 * 10^-6

(b) 4.3 * 10^-6

(c) 3.2 * 10^-6

(d) 10.6 * 10^-6

I had been asked this question in a job interview.

My question is based upon Ceramics in division Non Metallic Materials of Engineering Material & Metallurgy

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Right option is (b) 4.3 * 10^-6

Explanation: Silicon carbide has a good coefficient of thermal expansion of 4.3 * 10^-6/^oC  and that of alumina is 9 * 10^-6/^oC. The coefficients of thermal expansion of silicon nitride and sialon are 3.2 * 10^-6/^oC and 3.04 * 10^-6/^oC respectively. Among these common ceramics, partially stabilized zirconia (PSZ) has the highest value of 10.6 * 10^-6/^oC.

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