两种粒度WC配比与球磨时间对WC-20%Co粗晶合金显微组织的影响

Effects of WC Ratio and Milling Time on Microstructure of WC-20%Co Cemented Carbide

为同时改善粗晶硬质合金的硬度和断裂韧性,本文分别采用粗颗粒(10μm)和中颗粒(4μm)WC为原料,制备了不同粗颗粒WC含量的粗晶WC-20%Co硬质合金,利用光学显微镜和扫描电镜研究了不同WC配比和湿磨时间对合金显微组织结构的影响规律。结果表明:随着粗WC的含量的增加,粗颗粒WC生长对细颗粒WC消耗量增加,合金由非均匀结构向均匀结构转变,WC晶粒粒度分布范围变窄小,WC晶粒异常长大的趋势受到抑制;随着球磨时间的增加,合金中WC晶粒的异常长大趋势增加,粗WC的含量达到80%时,可以抑制WC晶粒的异常长大。

In order to simultaneously improve the hardness and fracture toughness of the coarse-grained cemented carbide, in this paper, coarse-grained WC-20%Co cemented carbide with different coarse particle WC content was prepared by using coarse particle（10 μm） and medium particle（4 μm） WC as raw materials, and the effects of different WC ratios and wet milling time on the microstructure of the alloy were investigated by optical microscopy and scanning electron microscopy. The results show that with the increase of the amount of coarse WC, it increases the consumption of fine particles WC,and the alloy changes from a non-uniform structure to a uniform structure, the particle size distribution range of WC grains becomes narrower, and the tendency of WC grains to grow abnormally is suppressed. As the ball milling time increases, the abnormal growth tendency of WC grains in the alloy increases, However,when the addition amount of coarse WC reaches 80%, the abnormal growth of WC grains can be suppressed.