Discussion
Consider the following statements about ceramic powder preparation.
1. Wet milling generally reaches a finer size than dry milling.
2. Spray drying produces free-flowing granules for pressing.
3. Binder remains in the ceramic after firing and adds to its strength.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: wet milling reaches a finer size, and spray drying produces the free-flowing granules a press requires. Statement 3 is the reverse of the truth - binder is burnt out before sintering, and any that remained would leave carbon and porosity that weaken the body rather than strengthen it.
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