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What is the fusion temperature of aluminum silica?

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What is the fusion temperature of aluminum silica?

(a) 1780^oC

(b) 1900^oC

(c) 2050^oC

(d) 2800^oC

I got this question during an online interview.

My query is from Properties of Refractories in section Refractories & Dielectric Materials of Engineering Material & Metallurgy

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The correct choice is (a) 1780^oC

Easy explanation: Aluminum silica containing 46% Al2O3 and 54% SiO2 has an approximate fusion temperature of 1780^oC. This refractory is a common type of acid refractory ceramic material. Silimanate and alumina have an approximate fusion temperature of 1900^oC and 2050^oC respectively.

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