Discussion
Increasing sintering time at a given temperature will
Answer: D
Correct answer: increase density but also coarsen the grains
Both processes are thermally activated and both run for as long as the part is held hot, so extra time buys density at the price of grain size. Because strength falls as grains coarsen, the two effects work against each other, and beyond a point the coarsening wins. The whole art of sintering practice lies in separating the two - through fast firing, pressure assistance or grain growth inhibitors.
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