Question

In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of?

(a) Ethyl silicate

(b) Sodium silicate

(c) Both Ethyl and Sodium silicate

(d) Neither Ethyl nor Sodium silicate

I got this question by my college director while I was bunking the class.

This interesting question is from Special Casting Techniques in section Special Casting Techniques of Casting-Forming-Welding I

Answer 1

Right option is (c) Both Ethyl and Sodium silicate

To explain I would say: The slurry in which prepared pattern is dipped into is made by suspending fine ceramic particles in ethyl silicate or sodium silicate.