Discussion
State whether the following is true or false.
Trapped gas inside closed pores can prevent a ceramic from reaching full density.
Answer: B
Correct answer: True
Once pores close off they contain whatever gas the furnace atmosphere provided. As the pore shrinks that gas is compressed, and its pressure eventually balances the capillary pressure driving the shrinkage - at which point densification simply stops. Prolonged firing then coarsens the pores rather than removing them, which is why the last few per cent of density is so often unreachable in air.
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