Discussion
Consider the following statements about engineering ceramics.
1. Zirconia is toughened by a phase transformation.
2. Silicon carbide conducts heat well and is very hard.
3. Aluminium nitride is chosen for its electrical conductivity.
Answer: D
The first two are correct. The third inverts the property, since aluminium nitride is valued precisely for being an electrical insulator while conducting heat well. That combination is precisely what an electronic substrate requires.
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