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What makes the molding sand refractory?

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in Engineering Material & Metallurgy by (773k points)
What makes the molding sand refractory?

(a) Additive

(b) High-temperature treatment

(c) Silica

(d) Clay

I have been asked this question in homework.

The doubt is from Mold Making in portion Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

1 Answer

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Right choice is (c) Silica

To explain: Silica sand is widely used as molding sand. It contains 80-90% of silicon dioxide. The silica gives refractoriness to the sand. The silica sand is cheap, easily available, has high thermal stability, and can be reusable.

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