摘要
WC原料粒度是影响硬质合金组织和性能的关键因素之一。本文通过混合两种粒度WC粉末获得双峰分布的WC原料来制备WC-8%Co-4%Ni(质量分数)合金,研究了不同粒度WC组合和不同烧结温度对合金组织结构与性能的影响。结果表明:粗、细WC按一定配比可以制备非均匀结构的双晶硬质合金,粗、细WC颗粒粒径相差越大,烧结温度越高,粗颗粒WC晶粒更容易粗化;0.8μm WC和20μm WC以质量比7:3混合制备的双晶结构硬质合金硬度HRA为87.5、断裂韧性为18 MPa·m^(1/2),相较于0.8μm WC粉制备的单晶结构硬质合金,硬度降幅不大但断裂韧性提高明显。
The particle size of WC raw materials is one of the key factors affecting the microstructure and properties of cemented carbides. In this paper, WC-8%Co-4%Ni(mass fraction) alloys were prepared by bimodally distributed WC raw materials obtained through mixing WC powder of two different particle sizes, and the effects of different particle size combinations and sintering temperature on the microstructure and properties of the alloys were studied. The results show that the bicrystal cemented carbides with non-uniform structure can be prepared by coarse and fine WC in a certain proportion. A larger difference in the particle size between coarse and fine WC and a higher sintering temperature lead to the easier coarsening of the coarse WC grains. Mixing WC powder with particle sizes of 0.8 μm and 20 μm in a mass ratio of 7:3 can achieve the preparation of bicrystal cemented carbides with the hardness HRA is 87.5 and fracture toughness is18 MPa·m1/2. The hardness decreases slightly while the fracture toughness increases significantly compared with those of single crystal cemented carbides prepared with WC powder of 0.8 μm.
作者
阳建宏
杨开明
刘海军
夏艳萍
汤郡
龙坚战
Yang Jianhong;Yang Kaiming;Liu Haijun;Xia Yanping;Tang Jun;Long Jianzhan(Zhuzhou Cemented Carbide Group Co.,Ltd.,Zhuzhou Hunan 412000,China;State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China)
出处
《硬质合金》
CAS
2022年第1期37-42,共6页
Cemented Carbides
基金
湖南创新型省份建设专项项目《先进高强度优特钢轧制用关键硬质合金轧辊材料研究及应用示范》(2019GK2052)。
关键词
WC粒度
双晶硬质合金
组织结构
性能
WC particle size
bicrystal cemented carbides
microstructure
properties
