TiC含量对WC-TiC-TaC硬质合金材料微观组织及力学性能的影响（英文）  

Effects of TiC Content on Microstructure and Mechanical Property of WC-TiC-TaC Cemented Carbides

作　　者：高姣姣[1] 姜龙凯 宋金鹏[1] 梁国星[1] 安晶[1] 谢俊彩 曹磊[1] 吕明[1] 

机构地区：[1]太原理工大学机械工程学院,精密加工山西省重点实验室,太原030024

出　　处：《无机材料学报》2017年第8期891-896,共6页Journal of Inorganic Materials

基　　金：National Natural Science Foundation of China(51405326,51575375);Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2014122)

摘　　要：本研究采用真空热压烧结技术,在1600℃下制备了WC-TiC-TaC硬质合金材料,研究了TiC含量对其微观组织及力学性能的影响。结果表明,随着TiC含量的增多,硬质合金材料的晶粒显著增大。当TiC的含量从10wt%增加到25wt%时,硬质合金材料的硬度逐渐增大,最高可达19.81 GPa,这是由于TiC的硬度高于基体WC的硬度;与此同时,硬质合金材料的抗弯强度和断裂韧度逐渐减小。当TiC的含量为10wt%时,材料的抗弯强度有最大值,其值为1147.24 MPa,这是由于在材料内部形成了均匀、细小的晶粒组织;在此含量下,复合材料的增韧机理为细晶增韧、裂纹偏转、裂纹分支、裂纹桥接和韧窝增韧,其断裂韧度有最大值,为14.60 MPa·m^(1/2)。WC-TiC-TaC cemented carbides were fabricated by hot-pressed sintering at 1600℃. Effects of TiC content on the microstructure and mechanical properties of these cemented carbides were investigated. It was found that when TiC content was increased from 10wt% to 25wt%, both the average grain size and the Vickers hardness increased pro- gressively, but both the flexural strength and the fracture toughness decreased gradually. The increase of Vickers hard- ness was attributed to the increase of TiC content and the hardness of TiC was higher than that of WC. The value of the highest Vickers hardness was 19.81 GPa. This work also showed that the highest flexural strength （1147.24 MPa） was ascribed to the fine and homogeneous grains, and that the highest fracture toughness （14.60 MPa.m1/2） was due to the intensive coupled mechanism of the fine-grain toughening, crack deflection, crack branching, crack bridging, and toughness dimples.

关 键 词：WC-TiC-TaC硬质合金 热压烧结 微观结构 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]