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In gravity compaction, the die is made of _________

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in Engineering Material & Metallurgy by (773k points)
In gravity compaction, the die is made of _________

(a) Graphite

(b) Lead

(c) Charcoal

(d) Quartz

The question was posed to me in a job interview.

Question is from Sintering and Compacting, Pig Iron and its Manufacture topic in chapter Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Correct option is (a) Graphite

The best I can explain: In gravity compaction, the die is filled with loose powder which is then sintered. The die is usually made of an inert material such as graphite. Since pressure is not used, the parts are more porous.

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