Ti(C0.7N0.3)对（Ti,W,Ta）C-Mo-Ni系金属陶瓷组织与性能的影响

Effects of Ti(C0.7N0.3) addition on the microstructure and properties of （Ti,W,Ta）C-Mo-Ni cermets

以(Ti,W,Ta)C和Ti(C0.7N0.3)固溶体颗粒共同作为硬质相原料,采用粉末冶金工艺制备Ti(C,N)基金属陶瓷材料,研究Ti(C0.7N0.3)添加量对(Ti,W,Ta)C-Mo-Ni系金属陶瓷组织与性能的影响。结果表明,(Ti,W,Ta)C-Mo-Ni系金属陶瓷由黑芯–灰环结构和白芯–灰环结构的2种硬质相和粘结相构成,黑芯相为Ti(C0.7N0.3)颗粒,白芯相为(Ti,W,Ta)C颗粒。随Ti(C0.7N0.3)添加量增加,黑芯–灰环结构增多,环形相变薄。Ti(C0.7N0.3)固溶体的加入对(Ti,W,Ta)C-Mo-Ni系金属陶瓷硬度的影响很小,而抗弯强度随Ti(C0.7N0.3)增加呈先升高后降低趋势。当Ti(C0.7N0.3)添加量(质量分数)为40%时,金属陶瓷的力学性能最优,硬度(HRA)为90.3,抗弯强度为1748 MPa。

The Ti(C,N)-based cermet materials were prepared by powder metallurgy using(Ti,W,Ta)C and Ti(C0.7N0.3)as hard phase materials.The effect of Ti(C0.7N0.3)additions on the microstructures and properties of(Ti,W,Ta)C-Mo-Ni cermets has been studied.The results indicate that the microstructure of(Ti,W,Ta)C-Mo-Ni cermets consist of black core-grey rim structure and white core-grey rim structure.The black cores is Ti(C0.7N0.3)particle and the white cores is(Ti,W,Ta)C particles.With increasing Ti(C0.7N0.3)addition,black cores increase and the rims become thinner.Adding Ti(C0.7N0.3)solid solution has little effect on the hardness of(Ti,W,Ta)C-Mo-Ni cermets,while the bending strength increases first and then decreases with the increase of Ti(C0.7N0.3).When the Ti(C0.7N0.3)content is 40%,the optimal properties of(Ti,W,Ta)C-Ti(C0.7N0.3)-Mo-Ni cermets is obtained,the hardness(HRA)is 90.3 and the bending strength is 1748 MPa,respectively.