Development of the grain‐boundary microstructure with heat treatment at 800° to 1500°C was examined for a group of 96% Al 2 O 3 ceramics containing a high‐MgO boundary phase. Using a combination of analytical and conventional electron microscopy techniques, eight different crystalline phases were detected at the boundaries following annealing. Despite the extensive devitrification, however, a residual glass remained in all samples examined, and is believed to be continuous.
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Powell‐Doǧan et al. (1990) studied this question.
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