In this study, Ti(C,N)-WC/Mo₂C-(Ta,Nb)C-Co/Ni cermets with varying [Mo]/([W] + [Mo]) mole ratios and constant [W] + [Mo] content were prepared by using TiO₂ and carbon as substitutes for a part of Ti(C,N). In situ carbothermal reaction took place with subsequent liquid phase sintering. The thermal behavior and outgassing behavior were conducted using differential thermal analysis/thermal gravity analysis (DTA-TG) and mass-spectrometric evolving gas analysis (MS-EGA). The microstructure was investigated by scanning electron microscopy (SEM). After being sintered in N₂ atmosphere, cermets without TiO₂ additions generally showed rimless microstructures with black grains independently distributed from other phases, whereas the cermets with TiO₂ addition showed complete core-rim microstructures. The average grain size generally decreased with increasing Mo content, and increased with increasing TiO₂ substitution. Moreover, the average grain size increased with decreased N₂ pressure from 50 mbar to 10 mbar at any [Mo]/([Mo] + [W]) ratio. The most interesting result was for the Mo-free cermets with 5 mol% TiO₂ and 10 mol% TiO₂ addition sintered in 50 mbar N₂: both the hardness and fracture toughness increased compared with the cermets without TiO₂ addition. The HV-K_IC behavior of the majority of the cermets was superior to the industrial grades.

在这项研究中，Ti（C，N）-WC / Mo ₂ C-（Ta，Nb）C-Co / Ni金属陶瓷具有不同的[Mo] /（[W] + [Mo]）摩尔比和恒定的[W]通过使用TiO ₂和碳代替部分Ti（C，N）来制备+ [Mo]含量。原位碳热反应发生，随后进行液相烧结。使用差示热分析/热重分析（DTA-TG）和质谱演变气体分析（MS-EGA）进行热行为和除气行为。通过扫描电子显微镜（SEM）研究了微观结构。在N ₂气氛中烧结后，不含TiO _2的金属陶瓷添加的金属通常显示无边缘的微结构，黑色晶粒与其他相独立分布，而添加TiO ₂的金属陶瓷则显示完整的核-边缘微结构。平均晶粒尺寸通常随着Mo含量的增加而减小，并且随着TiO ₂取代量的增加而增大。而且，在任何[Mo] /（[Mo] + [W]）比率下，平均晶粒尺寸都随着N ₂压力从50 mbar降低到10 mbar而增加。最有趣的结果是在50 mbar N _2中烧结了添加了5 mol％TiO ₂和10 mol％TiO ₂的无钼金属陶瓷：与没有TiO ₂的金属陶瓷相比，硬度和断裂韧性均提高了加成。大多数金属陶瓷的HV-K _IC性能优于工业级。