烧结工艺对纳米晶无黏结相硬质合金组织与性能的影响  

Effect of Sintering Process on Microstructure and Properties of Nanocrystalline Binderless Cemented Carbides

作　　者：张玉琪 吴翔[1] 董凯林[1] 叶红云 何炀 Zhang Yuqi;Wu Xiang;Dong Kailin;Ye Hongyun;He Yang(Zigong Cemented Carbide Co.,Ltd.,Zigong Sichuan 643011,China)

机构地区：[1]自贡硬质合金有限责任公司,四川自贡643011

出　　处：《硬质合金》2024年第6期535-543,共9页Cemented Carbides

摘　　要：采用传统粉末冶金工艺通过真空高温烧结和真空预烧+热等静压处理工艺制备了纳米晶无黏结相硬质合金,利用维氏硬度计、扫描电镜和湿砂轮式磨损试验机研究了烧结温度和烧结压力对合金微观组织和力学性能的影响。结果表明:提高烧结温度导致合金中出现了晶粒异常长大现象,而提高烧结压力获得了高致密均匀的组织结构。采用真空预烧+热等静压处理工艺制备的纳米晶无黏结相硬质合金具有优异的力学性能,硬度为29.01 GPa,断裂韧性为8.2 MPa·m^(1/2),磨粒磨损值为0.06 cm^(3)/(10^(5)·r)。Nanocrystalline binderless cemented carbides were prepared by traditional powder metallurgy process through vacuum high-temperature sintering and vacuum pre-sintering+hot isostatic pressing.The effects of sintering temperature and sintering pressure on the microstructure and mechanical properties of the cemented carbides were studied by Vickers hardness tester,scanning electron microscope,and wet grinding wheel wear tester.The results show that increasing the sintering temperature leads to abnormal grain growth in the cemented carbides,and increasing the sintering pressure results in a high-density and uniform microstructure.The nanocrystalline binderless cemented carbide prepared by vacuum pre-sintering+hot isostatic pressing has excellent mechanical properties.The hardness is 29.01 GPa;the fracture toughness is 8.2 MPa·m^(1/2),and the abrasive wear value is 0.06 cm^(3)/(10^(5)·r).

关 键 词：无黏结相硬质合金 热等静压 微观组织 性能 

分 类 号：TG1[金属学及工艺—金属学]