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Which of the following sands has the highest thermal conductivity?

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in Casting-Forming-Welding I by (687k points)
Which of the following sands has the highest thermal conductivity?

(a) Silica sand

(b) Zircon sand

(c) Chromite sand

(d) Olivine sand

I have been asked this question in final exam.

Origin of the question is Green Sand Mould in portion Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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Correct choice is (b) Zircon sand

The explanation is: It has low coefficient of thermal expansion. Due to high density and high chilling power, zircon sand has high thermal conductivity. These properties of the zircon sand make it very useful in controlling zircon sand, which is used as refractory bedding material.

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