WC原料粒度对超粗晶硬质合金组织与性能的影响  

Effect of WC Raw Material Particle Size on Microstructure and Properties of Ultra-coarse Grained Cemented Carbide

作　　者：王涵 叶金文[1] Wang Han;Ye Jinwen(College of Materials Science and Engineering,Sichuan University,Chengdu 610000,China)

机构地区：[1]四川大学材料科学与工程学院,成都市610000

出　　处：《工具技术》2022年第11期13-18,共6页Tool Engineering

基　　金：国家重点研发计划(2017YFB0305900)。

摘　　要：通过纳米粉末活化法制备了超粗晶硬质合金,并采用扫描电镜、万能试验机和维氏硬度计等检测方法对其进行微观组织及力学性能的表征,研究了WC原料粒度对超粗晶硬质合金微观组织和力学性能的影响。结果表明:随着烧结温度的升高,合金中的WC平均晶粒尺寸增大,WC晶粒间邻接度先减小后基本不变,Co相平均自由程先减小后基本不变,抗弯强度先增大后减小,硬度减小;随着WC原料粒度的增大,合金中的WC平均晶粒尺寸增大,WC晶粒间邻接度增大,Co相平均自由程增大,抗弯强度减小,硬度减小;当WC原料粒度为12~15μm、烧结温度为1450℃时,可以制备出平均晶粒尺寸6.80μm、抗弯强度2735MPa的超粗晶硬质合金。In this paper, ultra-coarse-grained cemented carbide is prepared by the nano-powder activation method, the microstructure and mechanical properties are characterized by scanning electron microscope, universal testing machine and vickers hardness tester, the effects of WC raw material particle size on the microstructure and mechanical properties of ultra-coarse-grained cemented carbide are studied.The results show that with the increase of the sintering temperature, the mean grain size of WC is increased, the contiguity of WC grains first decrease and then basically unchange, the mean free path of Co phase first decreases and then basically unchange, the bending strength first increases and then decreases, and the hardness decreases.With the increase of the particle size of the WC raw material, the mean grain size of WC is increased, the contiguity of the WC grains is increased, the mean free path of the Co phase increases, the bending strength and the hardness are decreased.When the particle size of the WC raw material is 12~15μm and the sintering temperature is 1450℃,the ultra-coarse-grained cemented carbide with the mean grain size of 6.80μm and the bending strength of 2735 MPa can be prepared.

关 键 词：超粗晶硬质合金 原料粒度 CO含量 烧结温度 力学性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程] TH162.1[金属学及工艺—合金]