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Which of the following cermet materials is used for rocket motor and jet-engine parts?

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Which of the following cermet materials is used for rocket motor and jet-engine parts?

(a) Tungsten carbide

(b) Molybdenum carbide

(c) Chromium oxide

(d) Titanium bromide

This question was posed to me in a national level competition.

The above asked question is from Thermosetting Plastics, Particle Reinforced Composites in section Non Metallic Materials of Engineering Material & Metallurgy

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Correct choice is (c) Chromium oxide

Best explanation: Chromium oxide, magnesium oxide, and aluminum oxide are the ceramics belonging to the oxide group of the cermet. They are used for rocket motor and jet-engine parts. Tungsten carbide is used for cutting tools, whereas titanium bromide is used for cutting tool tips. Molybdenum carbide is used in slip gauges and wire-drawing dies.

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