In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?
Correct answer: D. Tungsten carbide
- A. Zirconia
- B. Alumina
- C. Bakelite
- D. Tungsten carbide
Explanation
A cermet combines a ceramic or carbide phase with a metallic binder; tungsten carbide tools commonly contain cobalt as the metallic phase. Zirconia and alumina are ceramics alone, while Bakelite is a polymer.
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