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The coating is applied thicker at surfaces, where the faster cooling rate is required.

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in Casting-Forming-Welding I by (687k points)
The coating is applied thicker at surfaces, where the faster cooling rate is required.

(a) True

(b) False

The question was posed to me by my school principal while I was bunking the class.

My query is from Permanent Mould Casting topic in portion Special Casting Techniques of Casting-Forming-Welding I

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Right option is (b) False

Easiest explanation: The coatings can be both of insulating type and lubricating type. The coatings can be applied thicker at surfaces, which need to be cooled slowly, for example, sprues, risers, thin sections and runners. More the thickness of the coatings less will be the heat transfer rate from the castings.

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