真空烧结温度对WC-TiC-TaC-Co硬质合金组织和性能的影响  

Effect of vacuum sintering temperature on microstructure and properties of WC-TiC-Ta C-Co cemented carbide

作　　者：陈慧[1] 彭玲玲[1] 姜中涛[1] 邓莹[1] 涂铭旌[1] 

机构地区：[1]重庆文理学院重庆市高校微纳米材料工程与技术重点实验室,重庆402160

出　　处：《粉末冶金工业》2015年第3期33-36,共4页Powder Metallurgy Industry

基　　金：重庆市自然科学基金资助项目(CSTC2012JJYS0003);重庆市教委项目(KJ131216);重庆文理学院校级项目(Y2012CJ61;R2012CJ17)

摘　　要：采用高能球磨、真空烧结工艺制备WC-13(TiC+TaC)-8Co-1(VC+Cr3C2)硬质合金,研究了不同烧结温度对WC-TiC-TaC-Co硬质合金微观组织、力学性能和磁性能的影响。结果表明,提高烧结温度有利于提高合金的致密度,但是过高的烧结温度会导致晶粒长大,使合金致密度下降;合金的硬度、抗弯强度和矫顽力随着真空烧结温度的提高先增大后减小;相对磁饱和强度随着烧结温度的升高呈现下降的趋势;1 400℃烧结的合金综合性能较好,合金的相对密度99.6%、抗弯强度1 992 MPa,硬度92.3 HRA,矫顽力34.3 k A/m,相对磁饱和强度为76.5%。WC-13（TiC ＋TaC）-8Co-1（VC ＋Cr3C2） cemented carbide was prepared by high energy ball milling and vacuum sintering process.The effect of sintering temperature on the microstructure,mechanical and magnetic properties of the WC-TiC-TaC-Co cemented carbide was investigated.Experimental results show that the alloy density increases with the improving sintering temperature,but too high sintering temperature leads to grain growth,thus the alloy density decreases.The hardness,bend strength and coercive force of samples increase firstly and then decrease with vacuum sintering temperature increasing.The relative saturation magnetic induction intensity of samples decreases with increasing sintering temperature.When sintered at 1 400 ℃,the alloy has better properties with the relative density of 99.6％,bend strength of 1 992 MPa,hardness of 92.3 HRA,coercive force of 34.3 kA/m and relative saturation magnetic induction intensity of 76.5％.

关 键 词：硬质合金 真空烧结 组织 性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]