Discussion
Consider the following statements about the stages of sintering.
1. Most densification occurs during the intermediate stage.
2. Pores become isolated at the start of the final stage.
3. Grain growth is confined entirely to the initial stage.
Answer: A
The first two are correct. The third is wrong, since grain growth becomes most pronounced in the final stage and is exactly what makes that stage difficult. Pores separated from boundaries by growing grains are nearly impossible to remove.
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