Al2O3掺杂对Ce-ZrO2陶瓷微观结构和性能的影响

Al₂O₃掺杂对Ce-ZrO₂陶瓷微观结构和性能的影响

基金项目:

山东省中青年科学家奖励基金项目（2005SB08006）

详细信息

Institute of Materials Science and Engineering of Ocean University of China, Qingdao 266100, China

摘要: 在m-ZrO₂中添加不同摩尔质量分数的亚微米Al₂O₃,真空热压烧结成复合陶瓷。通过X-射线衍射和扫描电镜以及能谱对复合陶瓷进行表征,并对材料的密度及力学性能进行了检测和分析。实验结果表明:Al₂O₃的加入提高了烧结密度,强化了材料的晶界,部分Al₂O₃颗粒嵌入到ZrO₂基体晶粒内,形成“晶内型”结构;复合材料中存在多种增韧机制。相对于无掺杂的ZrO₂,添加Al₂O₃后的材料硬度,抗弯强度和断裂韧性都有所提高。
- Ce-ZrO₂ /
- Al₂O₃掺杂 /
- 微观形貌 /
- 晶内结构 /
- 增韧机制
Abstract: Sub-micron Al₂O₃ was added into CeO₂-ZrO₂ to form precursors powder which was hot press-sintered in vacuum atmosphere to form composite ceramics.The crystalline phase and structure of sintered ceramics were characterized with X-ray diffraction and scanning electron microscopy.The density and mechanical properties were also tested.The experimental results indicated that the Al₂O₃ enhanced the density,strengthened the material grains boundary,and part of Al₂O₃ has merged to the matrix particle,formed the transgranular structure.Compared to non-doped ZrO₂,the hardness,bending strength and the fracture toughness of the Al₂O₃ doped ceramics were improved.
- Ce-ZrO₂ /
- Al₂O₃-doping /
- Microstructure /
- Intracrystalline structure /
- Toughness mechanism