钨粉粒度和烧结温度对添加La_(2)O_(3)的钨合金性能和组织的影响  

Effect of Particle Size of Tungsten Powder and Sintering Temperature on Properties and Microstructure of Tungsten Alloy with La_(2)O_(3)

作　　者：张俊[1] 杨晓青[1] 李志翔[1] ZHANG Jun;YANG Xiao-qing;LI Zhi-xiang(Research and Development Center of Tungsten and Molybdenum,Chengdu Branch,Zigong Cemented Caibide Co.,Ltd.,Chengdu 610100,China)

机构地区：[1]自贡硬质合金有限责任公司成都分公司钨钼研发中心,四川成都610100

出　　处：《稀有金属与硬质合金》2021年第2期24-28,共5页Rare Metals and Cemented Carbides

摘　　要：通过传统粉末冶金的方法制备了添加0.15%La_(2)O_(3)的92W合金,研究了粗细两种不同粒度钨粉在1 490~1 520℃烧结温度下对制备的高密度92W合金的力学性能和显微组织的影响。结果表明:随着烧结温度的升高,细钨粉制备的合金抗拉强度下降,延伸率增加,冲击韧性先增加后下降;粗钨粉制备的合金抗拉强度先增加后下降,延伸率和冲击韧性增加。因此,采用不同粒度钨粉制备的含La_(2)O_(3)钨合金要获得最佳的综合力学性能应当采用不同的烧结温度。La_(2)O_(3)颗粒在合金组织中存在聚集和偏析,且随着烧结温度的不断升高越来越显著。细钨粉制备的钨合金在较低温度下烧结时,得到的钨晶粒度较粗钨粉制备的合金更粗大,而烧结过程采用较高温度时,得到的结果却相反。The 92 W alloy with 0.15% La_(2)O_(3) was prepared by conventional powder metallurgy method, the effects were investigated of coarse and fine tungsten powder with two different particle sizes sintered at 1 490~1 520 ℃ on mechanical properties and microstructure of the prepared high density 92 W alloy.The results show that with the increase of sintering temperature, the tensile strength of the alloy prepared with fine tungsten powder decreases, elongation increases, and impact toughness increases at first and then decreases, while the tensile strength of the alloy prepared with coarse tungsten powder increases at first and then decreases, and the elongation and impact toughness increase.Thus, different sintering temperatures should be adopted for the best comprehensive mechanical properties of tungsten alloy with La_(2)O_(3) prepared with tungsten powder of different particle sizes.The aggregation and segregation of La_(2)O_(3) particles in the alloy become more and more obvious with the continuous increase of sintering temperature.The grain size of tungsten alloy prepared with fine tungsten powder is coarser than that of the alloy prepared with coarse tungsten powder at lower sintering temperature, but the result is opposite when sintering is carried out at higher temperature.

关 键 词：钨合金 La_(2)O_(3) 烧结温度 钨粉粒度 力学性能 显微组织 

分 类 号：TF125[冶金工程—粉末冶金] TG146.4[冶金工程—冶金物理化学]