TiCN的添加对WC-Co硬质合金性能的影响

Effect of TiCN Addition on Properties of WC-Co Cemented Carbide

采用粉末冶金+高温液相烧结制备得到TiCN含量(质量分数)分别为0,0.5%,1.0%,1.5%,2.0%的WC-Co硬质合金,研究了TiCN含量对该硬质合金微观形貌、致密性能和力学性能的影响。结果表明:当TiCN含量不大于1.0%时,硬质合金的晶粒尺寸分布均匀,孔隙、微裂缝和杂质偏析等缺陷相对较少,而大于1.0%时,缺陷数量增多,缺陷尺寸变大;随TiCN含量的增加,硬质合金的致密性能降低,维氏硬度先增大后减小,抗弯强度和断裂韧度均先降低后略有增大再降低;当TiCN含量为1.0%时,硬质合金的综合性能最佳。

WC-Co cemented carbides were prepared by powder metallurgy and high temperature liquid sintering with TiCN content of 0,0.5 wt%,1.0 wt%,1.5 wt%,2.0 wt%,respectively.The effects of TiCN content on the micromorphology,densification performance and mechanical properties of the cemented carbide were studied.The results show that when TiCN content was no more than 1.0 wt%,the grain size of the cemented carbide distributed evenly and less defects such as holes,microcracks and impurity segregation were observed;when higher than 1.0 wt%,the amount of defects increased and the size bacame larger.With the increase of TiCN content,the densification performance of the cemented carbide decreased;the Vickers hardness increased and then decreased;the bending strength and fracture toughness first decreased then increased slightly and then decreased.When the TiCN content was 1.0 wt%,the comprehensive performance of the cemented carbide was the best.