W+Co+C(碳黑)制备板状晶硬质合金及其性能研究

采用经球磨扁平化处理的W粉末为原料,添加适量Co、C(碳黑)、成型剂及纳米W粉制备板状晶硬质合金,研究了烧结温度、时间和添加纳米W粉,对板状晶硬质合金显微组织结构和性能的影响。结果表明,球磨预处理中颗粒W粉末可获得扁平化程度高的薄片状W粉末,以其为原料制备的WC-12%Co(质量分数)板状晶合金相对密度达97%,合金硬度呈现出明显的各向异性;添加纳米W粉或提高烧结温度、延长烧结时间,均有利于压坯烧结收缩致密化,生成更多的板状WC晶粒。

Properties of Plate-like Grain Cemented Carbides prepared from W C Co base mixed powder

The WC-12wt%Co plate-like grain cemented carbides were prepared from plate-like W Co C (carbon black) base mixed powders. Effects of addition of nanometer tungsten powders and sintering processes on the microstructures and properties of plate-like grain cemented carbides were researched. It showed that the relative density of the WC-12wt%Co plate-like WC grain cemented carbides were near complete densification reached to 97%, the hardness of the alloys were exhibited obvious anisotropy, increasing the sintering temperature and prolonging sintering time or addition of nanometer tungsten powders were favor to sintering densification and the formation of more plate-like WC grains.