碳含量对WC-5.7%Co-5.7%Ni-0.13%Cr硬质合金组织与性能的影响  

Effect of Carbon Content on Microstructure and Properties of WC-5.7Co-5.7Ni-0.13Cr Cemented Carbide

作　　者：李敏 甘绪发 张洪刚[1] LI Min;GAN Xu-fa;ZHANG Hong-gang(Zigong Cemented Carbide Co.,Ltd.,Zigong 643011,China)

机构地区：[1]自贡硬质合金有限公司,四川自贡643011

出　　处：《稀有金属与硬质合金》2022年第3期87-92,共6页Rare Metals and Cemented Carbides

摘　　要：制备了配碳量在6.00%~6.16%范围内的WC-5.7%Co-5.7%Ni-0.13%Cr中颗粒硬质合金混合料,再经氢气脱蜡低压烧结一体炉烧结制备了硬质合金样。采用光学显微镜观察合金的金相组织,X射线衍射仪分析合金的物相,扫描电镜观察合金的微观组织,能谱仪测定合金中γ相成分。结果表明,碳含量为6.00%~6.16%的合金无脱碳、渗碳现象;合金抗弯强度、硬度、密度随着碳含量的提高均存在不同程度的下降;合金钴磁比相同粘接剂含量的钨钴合金低很多,且随着碳含量的增加而增大;合金矫顽磁力的变化趋势有别于传统钨钴合金:随着碳含量的增加,矫顽磁力也随之提高。The WC-5.7%Co-5.7%Ni-0.13%Cr medium-grained cemented carbide mixture with carbon content in the range of 6.00%~6.16%was prepared,and then the cemented carbide samples were sintered by hydrogen dewaxing low-pressure sintering integrated furnace.Optical microscope was used to observe the metallographic microstructure of the alloy,X-ray diffractometer was used to analyze the phases of the alloy,scanning electron microscope was used to observe the microstructure of the alloy,and energy disper-sive spectrometer was used to determine the composition ofγphase in the alloy.The results show that there is no decarburization and carburization in the alloy with carbon content of 6.00%~6.16%.The ben-ding strength,hardness and density of the alloy decrease to different extent with the increase of carbon con-tent.The magnetic cobalt ratio of the above alloy is much lower than that of tungsten-cobalt alloy with the same adhesive content,and it increases with the increase of carbon content.The change trend of coercive force of the above alloy is different from that of the traditional tungsten-cobalt alloy:The coercive force in-creases with the increase of carbon content.

关 键 词：硬质合金 WC碳含量 显微组织 力学性能 磁性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]