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Two kinds of commercial, submicron-grained, non-doped α-alumina powders were cold-isostatically pressed and then sintered at a constant heating rate. Before the sintering, pre-treatments were executed at 820 or 920°C for 50 h. The effects of the pre-treatments on the densification behavior and the microstructural development are discussed.The powders contained some nano-sized alumina particles about...
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