Property and Microstructure of Machinable B4C/BN Nanocomposites

摘要：

　　The B4C/BN nanocomposites were fabricated by hot-pressing sintering of the B4C/BN nanocomposite powders at 1850℃ for 1 h under the pressure of 30MPa.The composite powders with the microstructure of B4C particles coated with nano-sized BN particles were prepared by the chemical reaction of H3BO3 and CO(NH2)2 on the surface of B4C particles at high temperature.The microstructure investigation of the nanocomposites sintered samples showed that the nano-sized h-BN particles were homogenously distributed in the B4C matrix.With the increasing content of h-BN,the density of the B4C/BN nanocomposites decreased gradually; the fracture strength and fracture toughness of the B4C/BN nanocomposites decreased gradually,the strength and toughness of the B4C/BN nanocomposites with the h-BN content of 10wt% and 20wt% achieved high values.The Vickers hardness of the B4C/BN nanocomposites decreased remarkably with the increasing content of h-BN,while the machinability of the B4C/BN nanocomposites was significantly improved.The B4C/BN nanocomposites with the h-BN content more than 20wt% exhibited excellent machinability.

关键词： Boron carbide Nano-sized h-BN Mechanical property Machinability

作者: Tao Jiang Zhihao Jin Jianfeng Yang Guanjun Qiao

作者单位: State Key Laboratory for Mechanical Behavior of Materials,Xian Jiaotong University,Xian 710049,P.R.China

会议类型: 国际会议

会议名称: The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))

会议地点: 长沙

会议语种:英文

页码: 936-939

在线出版日期: 2007-05-10（万方平台首次上网日期，不代表论文的发表时间）