锆溶胶制备及其对刚玉莫来石复相陶瓷性能的影响

EFFECTS OF ZIRCONIA SOL ON THE PROPERTIES OF CORUNDUM -MULLITE DUPLEX CERAMICS

采用溶胶-凝胶法合成了锆溶胶,并在刚玉-莫来石质材料中引入ZrO2,分析了ZrO2溶胶对刚玉-莫来石复相陶瓷性能的影响特征。研究结果表明,ZrO2在主体材料中形成纳米包裹薄膜,ZrO2的分布可控和均匀掺入,不仅提高复相陶瓷的抗热震性、高温强度及蠕变性,而且还使微观结构可控、晶粒尺寸均匀。加入ZrO2溶胶产生氧化锆粒子的应力诱导相变增韧和微裂纹增韧是刚玉-莫来石质材料热震稳定性提高的主要原因。

Zirconia sol （ZrO2） was added into corundum-mullite materials by sol-gel technology, and the effect mechanism of silica sol on the properties of corundum-mullite ceramics was investigated. It is found that the addition of ZrO2 led by sol-gel can form sub-μm film on corundum-mullite particles, improve homogeneous distribution of ZrO2 in the materials and control the microstructure of the materials. ZrO2 can increase thermal shock resistance, high modulus of rupture and creep property of mullite-corundum duplex ceramic. The stress-induced-phase- transformation of ZrO2 and micro-cracks are the main reasons for improving thermal shock resistance of corundum-mullite duplex ceramic.