WC粒度、配碳量对WC-9%Ni硬质合金组织与性能的影响  

Effect of WC Particle Size and Carbon Content on Microstructure and Properties of WC-9%Ni Cemented Carbide

作　　者：江佳阳 廖军[1] 顾金宝[1] 梁靖岳 Jiang Jiayang;Liao Jun;Gu Jinbao;Liang Jingyue(Zigong Cemented Carbide Corp.,Ltd.,Zigong Sichuan 643000,China)

机构地区：[1]自贡硬质合金有限责任公司,四川自贡643000

出　　处：《硬质合金》2023年第4期288-295,共8页Cemented Carbides

摘　　要：采用Ni作为黏结相,通过粉末冶金工艺制备WC-9%Ni(质量分数)硬质合金,通过光学显微镜、硬度仪、X衍射分析仪等仪器,研究WC粒度、配碳量对WC-9%Ni硬质合金组织与性能的影响。结果表明:合金晶粒度受配碳量的影响较小,随WC粒度增大而增大;合金硬度随配碳量增加而降低,随WC粒度增大而降低。费氏粒度1.78μm的WC与费氏粒度2.4μm的WC制备的合金洛氏硬度最高分别为88.6HRA、87.5HRA,维氏硬度HV30最高分别为11.9、11.0 GPa。合金矫顽磁力与比饱和磁化强度极低,合金断裂韧性随配碳量的增加而降低,随WC粒度增加而增加,抗弯强度受配碳量影响较小,随WC粒度增加而降低。WC-9%Ni(mass fraction)cemented carbide was prepared by powder metallurgy process using Ni as binder phase.The effects of WC particle size and carbon content on the microstructure and properties of WC-9%Ni cemented carbide were studied by means of the optical microscope,hardness tester,and X-ray diffraction analyzer.The experimental results show that the grain size of the alloy is less affected by the carbon content and increases with the increase in WC particle size.The hardness of the alloy decreases with the increase in carbon content and the increase in WC particle size.The highest Rockwell hardness of the alloy prepared by WC of 1.78μm and 2.4μm is 88.6HRA and 87.5HRA,respectively,and the highest Vickers hardness HV30 is 11.9 GPa and 11.0 GPa,respectively.The coercive force and specific saturation magnetization of the alloy are extremely low.The fracture toughness of the alloy decreases with the increase in carbon content and increases with the increase in WC particle size.The flexural strength is less affected by the carbon content and decreases with the increase in WC particle size.

关 键 词：WC-9%Ni 配碳量 抗弯强度 晶粒度 弱磁性 

分 类 号：TG135.5[一般工业技术—材料科学与工程]