Owing to the denitrification behavior of Ti(C,N)-based cermets during the sintering process, nitrogen atmosphere sintering is essential for the fabrication of high-quality products. Disclosing the roles of the sintering atmosphere on the microstructure and properties of cermet is of significance. Herein, Ti(C,N)-based cermets were fabricated under six types of sintering atmosphere. Effects of sintering atmosphere on the microstructure, coercive force (Hc), specific saturation magnetization (Ms (%)), and mechanical properties of cermets were investigated. More rimless Ti(C,N) grains with increased fraction of black cores were formed with increasing the nitrogen partial pressure. Three types of gradient structure of cermets were confirmed caused by the different nitrogen activity at the liquid sintering state. Vacuum sintering induced the formation of thicker rims on smaller Ti(C,N) cores at the surface due to the low nitrogen potential, while fcc solid solutions rich in N was formed in nitrogen atmosphere. Vacuum sintered cermets showed the lowest Hc and Ms. (%) of 3.66 KA/m and 2.13%, owing to the denitrification process. High-quality Ti(C,N)-based cermets were achieved via the solid-state nitrogen atmosphere sintering, benefiting from the optimized core-rim structure, i.e. moderate thickness of rims and certain amount of black Ti(C,N) cores.

由于在烧结过程中基于Ti（C，N）的金属陶瓷的反硝化行为，氮气气氛烧结对于制造高质量产品至关重要。揭示烧结气氛对金属陶瓷的微观结构和性能的作用具有重要意义。在此，在六种烧结气氛下制造了基于Ti（C，N）的金属陶瓷。研究了烧结气氛对金属陶瓷的组织，矫顽力（Hc），比饱和磁化强度（Ms（％））和机械性能的影响。随着氮分压的增加，形成了更多的无核Ti（C，N）晶粒，且黑芯分数增加。在液态烧结状态下，由于氮气活性的不同，确定了三种金属陶瓷的梯度结构。真空烧结由于氮势低而在较小的Ti（C，N）核表面上形成了较厚的边沿，而富氮的fcc固溶体在氮气氛中形成。由于进行了反硝化过程，真空烧结金属陶瓷的Hc和Ms.（％）最低，为3.66 KA / m和2.13％。通过固态氮气氛烧结获得了高质量的Ti（C，N）基金属陶瓷，这得益于优化的芯-边缘结构，即适中的边缘厚度和一定数量的黑色Ti（C，N）芯。