稀土氧化物对原位合成PcBN复合材料性能及显微结构的影响  

Effect of rare earth oxides on properties and microstructure of in-situ synthesized PcBN composite

作　　者：钟生林 吴一[1] 王鹏[1] 李之凯 陈川 ZHONG Sheng-lin;WU Yi;WANG Peng;LI Zhi-kai;CHEN Chuan(College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,P.R.China)

机构地区：[1]桂林理工大学材料科学与工程,广西桂林541004

出　　处：《超硬材料工程》2018年第6期1-5,共5页Superhard Material Engineering

基　　金：广西创新驱动发展专项资金项目(桂科AA17204020);广西超硬材料重点实验室开放研究课题(2017-K-01)

摘　　要：将cBN、Al、Ti微粉添加不同稀土氧化物进行混料,采用高温(1400℃)、高压(5.5GPa)原位合成聚晶立方氮化硼(PcBN)复合材料。通过X射线衍射仪(XRD)、场发射扫描电子显微镜(SEM)研究了添加Y2O3、Gd2O3、Nd2O3对PcBN复合材料物相和显微结构的影响,测试并分析了不同稀土氧化物对该体系中各试样相对密度和力学性能的影响。结果表明:添加稀土氧化物可以提高样品的致密度和显微硬度,其中添加Gd2O3比添加Y2O3和Nd2O3更有利于促进TiB2棒晶的形成,获得综合力学性能最佳的PcBN,其显微硬度为33.21GPa、抗弯强度为885.42MPa。The polycrystalline cubic boron nitride(PcBN)composites were synthesized in situ by using mixed cBN,Ti,Al and Re2O3 powders with different rare earth oxides at high temperature(1400℃)and high pressure(5.5 GPa).The phase of PcBN composites with Y2O3,Gd2O3 and Nd2O3 was analyzed by X-ray diffraction,and the microstructure of samples was observed by scanning electron microscope.The effects of different rare earth oxides on the relative density and mechanical properties of each sample were tested and analyzed.The results shew that the addition of rare earth oxides increased the density and microhardness of the samples.It was more conducive to promoting the formation of TiB 2 rod crystals in the system by adding Gd2O3 than by adding Y2O3 and Nd2O3.PcBN added with Gd2O3 had the best comprehensive mechanical properties with the microhardness of 33.21GPa and the bending strength of 885.42 MPa.

关 键 词：聚晶立方氮化硼(PcBN) 稀土氧化物 二硼化钛(TiB2) 棒晶 

分 类 号：TQ164[化学工程—高温制品工业] TB333[一般工业技术—材料科学与工程]