The TiB₂-x vol% TiN-20 vol% (Fe-Ni) system cermets with various volume fraction of TiN were successfully fabricated through gas pressure sintering. The effects of TiN content on the mechanical properties and microstructure of TiB₂-based cermets was explored in detail. The microstructure and compositional analyses of TiB₂-based cermets were investigated by SEM, EPMA, TEM, and X-ray diffraction. The results shown that only TiB₂, TiN and Fe_0.64Ni_0.36 phases in the TiB₂-based cermets, not any other brittle phases such as M₂B, M₂₃B₆ could be found. The TiB₂ grains formed a typical core-rim structure, but the TiN particles didn't. The dominant fracture mode of TiB₂-based cermets transformed from intergranular fracture to transgranular fracture as the TiN content increasing from 0 to 25 vol%. Toughening mechanisms of TiB₂-based cermets transformed from debonding, crack deflection to crack bridging and crack deflection as the TiN content increasing. The properties of TiB₂-based cermets have been greatly enhanced as the TiN content varying from 0 to 25 vol%. The transversal rupture strength, indentation fracture toughness, Vickers hardness, and relative density of TiB₂–20 vol% TiN-20 vol% (Fe-Ni) cermet reached up to 1191.12 ± 40 MPa, 18.77 ± 0.40 MPa m^1/2, 14.40 ± 0.20 GPa, and 99.74 ± 0.20%, respectively.

通过气压烧结成功地制备了具有不同体积分数的TiN的TiB ₂ -x体积％TiN-20体积％（Fe-Ni）系统金属陶瓷。详细探讨了TiN含量对TiB ₂基金属陶瓷力学性能和微观结构的影响。通过SEM，EPMA，TEM和X射线衍射研究了基于TiB ₂的金属陶瓷的微观结构和组成分析。结果表明，在基于TiB ₂的金属陶瓷中，只有TiB ₂，TiN和Fe _0.64 Ni _0.36相，没有发现任何其他脆性相，如M ₂ B，M ₂₃ B ₆。TiB ₂晶粒形成了典型的核-边缘结构，但TiN颗粒却没有。随着TiN含量从0到25 vol％的增加，基于TiB ₂的金属陶瓷的主要断裂模式从晶间断裂转变为跨晶断裂。随着TiN含量的增加，基于TiB ₂的金属陶瓷的增韧机理从脱胶，裂纹变形到裂纹桥接和裂纹变形。当TiN含量从0到25vol％变化时，基于TiB ₂的金属陶瓷的性能已大大提高。TiB ₂ –20体积％TiN-20体积％（Fe-Ni）金属陶瓷的横向断裂强度，压痕断裂韧性，维氏硬度和相对密度达到1191.12±40 MPa，18.77±0.40 MPa m ^1/2，14.40±0.20 GPa和99.74±0.20％。