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The polishing of cast iron and finishing of stainless steels are applications of ______

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The polishing of cast iron and finishing of stainless steels are applications of ______

(a) Silicon carbide

(b) Boron carbide

(c) Tungsten carbide

(d) Aluminum oxide

This question was posed to me during an interview.

The question is from Abrasives, Silicate Structures and Polymorphism in chapter Composite & Ceramic Materials of Engineering Material & Metallurgy

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Right choice is (d) Aluminum oxide

The best I can explain: Aluminum oxide is an abrasive which is obtained by heating of aluminum salts or from ores of bauxite. It has a lighter color compared to silicon carbide and is not as hard, but is more resistant to impact. It is used for polishing cast irons, non-ferrous materials, and for giving a lustrous finish to stainless steels.

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