Question

To reduce the friction between the mould’s surface and casting, a refractory coating is done to the surface of mould.

(a) True

(b) False

I had been asked this question by my college professor while I was bunking the class.

I'd like to ask this question from Solidification with Predominant Resistance in Mould in division Cooling and Solidification of Casting-Forming-Welding I

Answer 1

The correct choice is (b) False

The best explanation: Minimization of friction between the mould and casting surface and for the continuous release of the shell from the mould is achieved through the introduction of mould oscillation aided by the lubrication. Refractory coating of the mould’s surface is basically done for the finishing aspect.