稀土对PCBN复合材料显微结构及性能的影响  

Effect of rare earth on microstructure and properties of PCBN composites synthesized

作　　者：罗涛[1] 江文清[1] 吴金会[1] 刘晓红[1] LUO Tao;JIANG Wenqing;WU Jinhui;LIU Xiaohong(Jiu Jiang Vocational and Technical College,Jiujiang 332000,China)

机构地区：[1]九江职业技术学院,江西九江332007

出　　处：《粉末冶金工业》2020年第6期55-59,共5页Powder Metallurgy Industry

摘　　要：以稀土Eu2O3和Pr2O3作为cBN-Al-Ti体系的添加剂,在高温(1 600℃)、高压(5.5 GPa)条件下烧结制备PCBN复合材料。研究了稀土对PCBN物相、显微组织形貌、气孔率及力学性能的影响。结果表明,稀土Eu2O3和Pr2O3的添加不仅改善增强相TiB2的组织形貌和降低样品的气孔率,而且提高了烧结体的硬度和抗弯强度。当添加稀土Pr2O3时,PCBN获得最佳力学性能,其显微硬度达40.15GPa,抗弯强度达801.24 MPa。PCBN composites were prepared by sintering rare earth Eu2O3 and Pr2O3 as additives in the c BN-Al-Ti system at high temperature(1600℃) and high pressure(5.5 GPa). The effects of rare earth on the phase,microstructure,porosity and mechanical properties of PcBN were studied. The results show that the addition of Eu2O3 and Pr2O3 not only improves the morphology of the reinforced phase TiB2 and reduces the porosity of the sample,but also increases the hardness and bending strength of the sintered body. When adding rare earth Pr2O3,PCBN obtains the best mechanical properties,its microhardness reaches 40.15 GPa,and its bending strength reaches 801.24 MPa.

关 键 词：CBN 高温高压 PCBN 稀土氧化物 TIB2 

分 类 号：TB332[一般工业技术—材料科学与工程]