WC粉末特性对YG22硬质合金性能的影响

Effects of WC Powder Characteristics on the Properties of YG22 Cemented Carbide

分别采用由三种不同工艺生产的WC粉末为原料制备YG22硬质合金,并研究WC粉末特性对所制备合金中WC的晶粒度及其分布,以及合金硬度、抗弯强度、冲击韧性、磁力等性能的影响。结果表明:在相同制备条件下,当合金中WC晶粒度相当时,采用晶形发育良好、组织缺陷少的WC粉末所制备的合金,其WC晶粒度分布较均匀,且合金硬度、抗弯强度、冲击韧性均优于采用晶形发育较差、组织缺陷较多的WC粉末所制备的合金;为改善YG22合金性能,在选择原料时既要考虑WC粉末的粒度及其分布,也要考虑WC粉末内部显微组织的发育情况。

Different YG22 cemented carbides were prepared with WC powders synthesized by three different methods. Meanwhile,the investigation was made of the effects of WC powder characteristics on WC grain size and its distribution, hardness, bending strength, impact toughness and coercive force of the cemented carbides. The results show that under the conditions of same preparation process and same carbide grain size,well-developed crystalline WC powder with less microstructure defects can prepare better cemented carbide, with more uniform grain size and higher hardness, bending strength and impact toughness than the poorly-developed crystalline WC powder with more microstructure defects. In order to improve the properties of YG22 cemented carbides, the particle size and its distribution, as well as the microstructure development of WC powders should be considered when choosing the raw materials.