Elimination of Large Artificial Pores During the Hot Isostatic Pressing of Presintered Alumina

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Abstract
Shrinkage of large pores during hot isostatic pressing (HIP) of presintered alumina has been studied. When alumina specimens containing artificially produced large spherical pores are HIP treated, pore shrinkage occurs predominantly by plastic deformation. When the temperature of the HIP treatment is 1850°C, the pores appear to collapse with particle fragmentation and sliding. The complete elimination of large pores is hard to achieve, because the pressure of N2 gas entrapped in the pores increases with their shrinkage. The practical implication of these results is that large voids or cracks inside ceramics can be removed by using the proper pressure/temperature regime.

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