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本文通过选用碳含量不同的WC原料配制成4组WC-22%Co高钴硬质合金,采用物理性能检测、光学金相等分析方法,对比研究了不同碳含量WC对WC-22%Co高钴硬质合金烧结后的性能和硬质相粒度的影响。结果表明:在所有方案中,原料WC中碳质量分数为5.97%时,合金抗弯强度最高,达到2 590 MPa,但合金金相组织不均匀,粗大WC晶粒数量较多,WC粒度分布最宽;随着原料WC碳含量的增加,合金金相组织趋于均匀化,粗大晶粒数量逐渐减少且WC晶粒粒径离差系数同步减小,并在WC碳质量分数为6.14%时WC晶粒粒径离差系数出现最小值,为0.475 7。
In this paper, four WC-22% Co high-cobalt cemented carbides were prepared by selecting WC raw materials with different carbon contents. Physical properties and optical metallographic analysis were used to study the effects of WC with different carbon contents on WC-22% Co Effect of Co - Carbide Sintering Performance and Hard Phase Particle Size. The results show that the flexural strength of the alloy is 5.990%, and the highest flexural strength is 2.590 MPa. However, the microstructure of the alloy is inhomogeneous, the number of coarse WC grains is large and the distribution of WC particles is the most Wide; With the increase of the carbon content of the raw material WC, the microstructure of the alloy tends to be uniform, the number of coarse grains decreases and the dispersion coefficient of grain size of WC decreases synchronously. When WC mass fraction of WC is 6.14% The minimum value of the grain size deviation coefficient is 0.475 7.