WC粉末粒度与形貌对硬质合金中WC晶粒度、晶粒形貌与合金性能的影响

Effect of Particle Size and Morphology of Tungsten Carbide Powder on Grain Size, Grain Morphology and Properties of Cemented Carbide

探讨了粗颗粒与特粗颗粒两种粒度级别以及平面化表面与球化表面两种形貌特征的WC原料对WC-Co硬质合金中WC晶粒度、晶粒形貌以及合金性能的影响。结果表明,分别采用费氏粒度为11.4￣13.4μm,与22.0￣28.3μm两种粒度级别的WC粉末为原料制备合金,尽管两种合金硬度之间存在明显差别,但是两种合金的晶粒度相差很小,在4.0￣4.3μm之间,同属一种粒度级别。WC原料的原始形貌对合金中WC晶粒形貌与合金性能影响很小,碱金属掺杂原料制备的合金中WC晶粒结晶完整性相对较差。因此,高纯原料是制备高性能硬质合金的基础。

Effects of particle size and morphology of tungsten carbide powder, i.e. the coarse and ultra-coarse with Fisher Sub-Sieve Size （11.4-13.4 μm and 22.0-28.3 μm respectively）, flat and spherical surface on the grain size, grain morphology as well as the properties of WC -Co cemented carbide are investigated.Experiments show that there is considerable difference in the hardness of the two alloys, while the grain size difference is quite small. The average grain size of the alloys are between 4.0-4.3 μm. There is little effect of the morphology of tungsten carbide powder on the morphology of tungsten carbide grain and the properties of the alloys. The crystalline perfection of tungsten carbide grain in the alloy can be impaired by tungsten starting material which undergoes the adulteration of alkali metal. Therefore, raw materials with high purity are demanded for the preparation of cemented carbide with high properties.