论文部分内容阅读
结合相图热力学计算,使用DICTRA软件计算模拟Co-W-Ti-C-N、Co-W-Ti-Nb-C-N和Co-W-Ti-Ta-C-N体系梯度硬质合金梯度层形成过程,对比计算模拟和实测的梯度硬质合金中Co含量的距离变化曲线。通过分析各相体积分数及组元成分随距离的分布研究烧结时间、烧结温度、Co含量和Ti含量对梯度层厚度的影响。结果表明:计算模拟与实验数据吻合较好。延长烧结时间、升高烧结温度和增加Co含量均会促进梯度层厚度的增加,而增加Ti含量则会抑制梯度层厚度的增加。
Combined with thermodynamic calculation of phase diagram, the formation process of gradient cemented carbide gradient layer in Co-W-Ti-CN, Co-W-Ti-Nb-CN and Co-W-Ti-Ta-CN system was simulated by DICTRA software. Curve of the distance of Co content in simulated and measured gradient cemented carbide. The effects of sintering time, sintering temperature, Co content and Ti content on the thickness of the gradient layer were investigated by analyzing the volume fraction of each phase and the component distribution with distance. The results show that the calculated data agree well with the experimental data. Prolonging the sintering time, increasing the sintering temperature and increasing the content of Co all promote the increase of the gradient layer thickness, while increasing the Ti content will suppress the increase of the gradient layer thickness.