摘要：在高纯Al₂O₃粉体中添加质量分数为16%的亚微米ZrO₂粉体,制备Al₂O₃-ZrO₂复合粉体,通过X射线衍射仪、电子探针和扫描电子显微镜分别对样品的相组成和显微结构进行分析,研究不同烧结温度下亚微米ZrO₂粉体对氧化铝陶瓷抗折强度和硬度的影响。结果表明,在1 450℃时无压烧结2 h,Al₂O₃-ZrO₂复相陶瓷的晶粒粒径约为0.5μm,抗弯强度高达797 MPa,提高了46%,维氏硬度为17.9 GPa。

关键词：超细粉体；烧结温度；氧化铝陶瓷；力学性能

Abstract：Al₂O₃-ZrO₂ composite materials were prepared by doping submicron-sized ZrO₂ powders with the mass fraction of 16% into ultra-high purity domestic Al₂O₃ powders.The phase composition and microstructure of samples were analyzed by XRD,electron probe and SEM.The effect of submicron-sized ZrO₂particles on bending strength and hardness of alumina ceramics at different sintering temperatures was researched.The results show that loose sintered at 1 450 ℃ for 2 h,the crystal grain size of Al₂O₃-ZrO₂ composite ceramics is about 0.5 μm.Its bending strength researches 797 MPa,which is increased by 46%.Its hardness is 17.9 GPa.

Keywords：ultrafine particle;sintering temperature;Al₂O₃ ceramics;mechanical property