Ni含量对粗晶WC-Co-Ni硬质合金组织和性能的影响

Effect of Ni Content on the Microstructure and Properties of WC-Co-Ni Cemented Carbide

以WC-10%(Co+Ni)硬质合金为研究对象,在相同含量的Co+Ni粘结相中采用不同的钴镍比来研究Ni含量对WC-Co-Ni硬质合金组织和性能的影响。结果表明随Co+Ni粘结相中的镍含量的增加,合金中显微组织结构中的粘结相的分布均匀性变差;WC晶粒的尺寸和圆度增大。合金的强度性能结果表明WC-(Co+Ni)硬质合金在粘结相质量分数为60%Co-40%Ni时抗弯强度出现最大值;随Ni含量的增加,WC-(Co+Ni)硬质合金的硬度值相差不大,但呈下降趋势;合金的密度几乎没有变化;合金的钴磁降低,磁力呈现先增后降。

In this paper the effect of the Ni content in Co-Ni binder on the microstructure and properties of WC-Co- Ni cemented carbide processed by conventional powder metallurgy was studied. The results show that, with the increase of the nickel content in Co-Ni binder, the distribution of binder phase becomes inhomogenous and the size and roundness of the WC grain in alloy increases. The transverse flexural strength of the alloy appears maximum value in WC-（60wt%Co- 40wt%Ni ） cemented carbide. Meanwhile, with the increase of Ni content, the hardness decreases, the density is almost the same, the cobalt magnetism drops and the coercive force first grows and then reduces.