摘要
基于国外定向凝固氧化物/氧化物共晶复合陶瓷的晶体生长动力学行为的研究成果,阐述其动力学机制,分析动力学因素对微观结构形态的影响,探讨晶体生长热力学、动力学行为与微观结构形态之间的关系,同时结合以燃烧合成、快速凝固技术制备的新型高强韧Al2O3/ZrO2(Y2O3)共晶复合陶瓷,探讨共晶复合陶瓷在快速凝固条件下的晶体生长动力学行为。结合定向凝固与快速凝固两种晶体生长机制,得知过冷度、凝固界面前沿的温度梯度是影响晶体生长方式的重要因素,且受二者决定的凝固速率(即晶体生长速率)则决定材料的最终微观结构与形态。
Based on the studies of kinetic behaviors of crystal growth of directionally solidified oxide/oxide eutectic composite ceramics, the kinetic mechanisms are introduced, and the influences of kinetic parameters on the microstructure as well as the correlation of thermodynamic behavior, kinetic behaviors and the morphologies of the microstructures are discussed; meanwhile, by combining with a new high-performance A12O3/ZrO2（Y2O3） eutectic composite ceramics prepared by combustion synthesis and rapid solidification, the kinetic behaviors of crystal growth of eutectic composite ceramics are investigated under rapid solidification. As for mechanisms of crystal growth under the different conditions of directional solidification and rapid solidification, it is obtained that the degree of under-cooling and solidification thermal gradient are two important factors to play the predominant roles in crystal growth, whereas final microstrures of the materials are dependent on the solidification rate （growth velocity of the crystal） controlled by the above two factors.
出处
《粉末冶金材料科学与工程》
EI
2007年第5期290-295,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(50672131)
国防预先研究资助项目(51312010708)
