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中文摘要：
对纳米γ-A12O3陶瓷粉末在预热温度为0．5Tm的条件下，以不同的爆炸压实压力实施了烧结实验。通过X射线衍射分析了烧结体的晶型，并用高分辨率扫描电子显微镜进行了微观组织观察。实验结果表明，纳米γ-Al2O3陶瓷粉末在爆炸压力为13．1GPa时可得到晶粒间结合致密且晶粒度在100nm左右的α-AlO3烧结体；而在爆炸冲击压力为9．35 GPa以下时，烧结体的晶型没有发生转变，仍然是γ-Al2O3晶型。
英文摘要：
Preheated explosive consolidation （PHEL;） experiments were pertormea on me γ-Al2O3 nanometer ceramic powders under different explosive pressures at the preheated temperature of about 0.5Tm. The crystal types for the studied ceramic powders were analyzed by using the X-ray diffraction data, and their microstructures were observed with a high-resolution scanning electronic microscope. The experimental results show as followings： （1）when the shock pressure reaches 13.1 GPa, the γ-Al2O3 nanometer powders are well sintered to α-AlzO3 crystal type;（2）the crystal grains in the sintered bulk are combined tightly with each other and the average grain size is around 100 nm, but the γ-Al2O3 nanometer powders cannot be changed into a-Al2O3 crystal type when the shock pressure decreases to 9.35 GPa.
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