基于超重力下燃烧合成Al_2O_3/ZrO_2(4Y),通过调整超重力大小,研究超重力对复合陶瓷凝固组织与性能的影响.结果表明:随着超重力增加,陶瓷共晶团从胞状结构转化为棒状结构,且棒状共晶团得以细化,其体积分数与长径比增加.性能显示:随着超重力增加,陶瓷相对密度显著提高,陶瓷硬度与弯曲强度因棒状共晶团细化、内部缺陷尺寸减小而得以增大,同时因棒状共晶团细化及分布于共晶团边界上ZrO_2四方相细化、球化,陶瓷断裂韧性也随之升高.
Based on preparation of Al_2O_3/ZrO_2(4Y) by combustion synthesis under high gravity, the influences of high gravity on solidification microstructures and properties of the materials were investigated by changing the level of high gravity. The results indicated that with increasing of the level of high gravity, the micromorphologies of the ceramic eutectics transformed from the cells to the rod-shaped colonies, which were refined, and their volume fraction and aspect ratio increased. The mechanical properties showed with increasing of the level of high gravity, the relative density of the ceramics increased, while the hardness and flexural strength of the ceramics increased because of the refinement of the rod-shaped colonies and the decrease of the flaw size, and the fracture toughness of the ceramics also increased due to the refining of rod-shaped colonies and refining, sphericizing of tetragonal ZrO_2 phases at inter-colony regions.
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