Question

"$S{i}_3{N}_4,B_{4}C$ and $SiC$ are oxide ceramics."
Answer whether the above statement is true or false.

• A. True
• B. False

Answer 1

The correct option is B False

The most important structural non-oxide ceramics are silicon carbide SiC, silicon nitride Si₃N₄ and the so-called sialons, nitride-based ceramics with varying oxide contents. Non-oxides must undergo high- temperature processing in reducing or inert atmosphere to prevent oxidation. Hence they are non-oxide ceramics.