Preparation, Microstructure and Mechanical Properties of Nanocomposite Ceramics

摘要：

Different techniques were adopted in the preparation of micron-nanometer composite powder. Alumina-zirconia nanocom -posites were prepared by SPS sintering. The fracture mechanism, microstructure and mechanical properties were also studied, and it indicated that alumina-zirconia nanocomposites whose fracture mode is intercrystalline fracture can be obtained by SPS sintering with nano composite powder prepared by mechanically mixed dispersion. The fracture mode of 25wt percent zirconia/alumina composites treated by heterocoagulation system method transforms from conventional intercrystalline fracture to intercrystalline-transcrystalline fracture. The refinement of grain and the formation of transgranular structure increase the mechanical properties of matrix, so the intensity and fracture toughness of sample sintered by SPS reaches 600MPa and 7.6 MPa·m1/2, which are 50 percent and 26 percent higher than alumina-zirconia micro composites of the same component. The research lays a foundation for farther research on the grinding characteristic of nanocomposite ceramics.

关键词： alumina-zirconia nanocomposites fracture mechanism microstructure mechanical properties

作者: ZHAO Bo WANG Quancai WU Yan

作者单位: School of Mechanic and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China School of Mechanic and Power Engineering, Shanghai Jiaotong University, Shanghai 200003, China

会议类型: 国际会议

会议名称: The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)

会议地点: 河南焦作

会议语种:英文

页码: 2689-2693

在线出版日期: 2007-04-17（万方平台首次上网日期，不代表论文的发表时间）