Discussion
Assertion (A): Ceramic components are machined in the green state wherever possible.
Reason (R): A sintered ceramic is extremely hard and can only be cut with diamond tooling.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the economics. Green ceramic cuts like chalk with ordinary tooling at high speed; a sintered ceramic is harder than most tool steels and must be ground with diamond, slowly and at considerable cost. Anything that can be machined before firing therefore is - allowing for the shrinkage - and only the final close tolerances are ground afterwards.
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