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Which of the following helps in reducing the oxidation of the material in vacuum die casting?

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in Casting-Forming-Welding I by (687k points)
Which of the following helps in reducing the oxidation of the material in vacuum die casting?

(a) Mould thickness

(b) Mould material

(c) Tight tolerances

(d) Mould coating

This question was posed to me during an interview.

My question is based upon Vacuum Die Casting in chapter Special Casting Techniques of Casting-Forming-Welding I

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The correct choice is (c) Tight tolerances

The explanation: In vacuum die casting, the part is exposed to atmospheric air only after solidification, and oxidation of the material is avoided as much as possible. This can be achieved by processing of parts with tight tolerances and also by faster cooling rate which results into fine microstructure nature of castings.

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