Mo添加对TiC-TiN-WC-Ni金属陶瓷显微组织与磁学、力学性能的影响

Effect of Mo Addition on Microstructure, Magnetic and Mechanical Properties of TiC-TiN-WC-Ni Cermets

本文研究了3%~15%Mo添加对TiC-12%TiN-10%WC-25%Ni金属陶瓷显微组织和磁学、力学性能的影响。结果表明,经1 430℃真空烧结1 h后,金属陶瓷都由Ni基粘结相和Ti(C,N)陶瓷颗粒组成。随着Mo含量增加,粘结相中合金元素的总含量增加。陶瓷颗粒通常由黑芯、白色内环和灰色外环组成,当Mo含量为6%~9%时,陶瓷颗粒明显细化。不管Mo含量高低,金属陶瓷室温均呈顺磁性,但室温磁化强度和剩磁随着Mo含量增加而下降。金属陶瓷的抗弯强度在Mo含量为6%时达到峰值,洛氏硬度随着Mo含量增加先略有下降然后略有上升。

The effects of 3% ~15% Mo addition on microstructure, magnetic and mechanical properties of TiC-12%TiN-10% WC-25% Ni cermets were investigated in the present paper. Results show that the cermets consist of Ni-based binder phase and carbonitride ceramic grains after sintering in vacuum at 1 430 ℃ for 1 h. The total content of alloying elements in Ni based binder phase increases with the increase of Mo content. Ceramic grains were generally composed of black core, bright inner rim and gray outer rim. When the content of Mo is 6%~9%, the ceramic grains are obviously refined.Cermets are paramagnetic at room temperature, in despite of Mo content, but the room-temperature M and Mr decrease with the increase of Mo content. Transverse rupture strength of cermets reaches a maximum at 6% Mo content, and Rockwell hardness decreases slightly and then increases slightly with the increase of Mo content.