Question

Core finishing also includes a coating of refractory materials on cores to protect them.

(a) True

(b) False

The question was asked in exam.

My enquiry is from Dielectric Core Bakers topic in chapter Core and Core Making of Casting-Forming-Welding I

Answer 1

Correct answer is (a) True

To explain I would say: Cores are generally coated with refractory or protective materials by performing several operations like brushing, dipping and spraying, which greatly improves the refractoriness and surface finish of the cores. The coating material on cores also restricts the liquid metal from entering into the pores of a core.