摘要
对纳米γ-Al2O3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13.1 GPa时可得到晶粒间结合致密且晶粒度在100 nm左右的α-Al2O3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。
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.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2008年第3期220-224,共5页
Explosion and Shock Waves
基金
国家自然科学基金项目(10572034)
辽宁省自然科学基金项目(20042161)
关键词
爆炸力学
Α-AL2O3
预热爆炸压实
纳米陶瓷
晶型分析
微观组织
mechanics of explosion
α-Al2O3
preheated explosive consolidation
nanometer ceramic
crystal type analysis
microstructure
