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Which of the following liquids is used for the formation of slurry in investment casting?

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in Casting-Forming-Welding I by (687k points)
Which of the following liquids is used for the formation of slurry in investment casting?

(a) Ammonium hydroxide

(b) Carbon disulfide

(c) Sodium silicate

(d) Glycerin

I had been asked this question in an interview for job.

The doubt is from Precision Investment Casting in portion Special Casting Techniques of Casting-Forming-Welding I

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Right option is (c) Sodium silicate

Best explanation: To make the mould, the prepared pattern is dipped into slurry made by suspending fine ceramic materials in a liquid called sodium silicate or sometimes another liquid ethyl silicate is also used for the preparation of slurry. The excess liquid is allowed to drain off from the pattern to have an appropriate thickness of the mould.

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