To further improve the mechanical properties of the Ti(C,N)-TiB₂-Co cermets prepared by in-situ reaction hot pressing, the TaC and WC were added in Ti-C-BN-Co system. The effect of varying TaC/(TaC + WC) weight ratio on the microstructure and mechanical properties of the cermets was studied by scanning electron microscope, X-ray diffraction, and tests of Vickers hardness, bending strength, and fracture toughness. The result demonstrated that, as the TaC/(TaC + WC) weight ratio increased, the CoW₂B₂ impurities phase gradually decreased until it disappeared. The main peak ((200)) of Ti(C,N) gradually shifted to the left and the lattice parameters increased. Microstructure analyses of cermets revealed that the porosity increased first and then decreased. The so-fabricated cermets contained three kinds of core-ring structure grains: black core-gray ring, dark gray core-gray ring, and dark gray core-white inner ring with a gray outer ring. As the TaC/(TaC + WC) weight ratio increased, the thickness of the ring phase gradually increased. The Vickers hardness, bending strength, and fracture toughness of the cermets first increase to the maximum and then decrease; when the weight ratio was 0.4, the maximum values were 2052 HV₁₀, 998 MPa, and 7.68 MPa m^1/2, respectively.

为了进一步改善通过原位反应热压制备的Ti（C，N）-TiB ₂ -Co金属陶瓷的机械性能，将TaC和WC添加到Ti-C-BN-Co系统中。通过扫描电子显微镜，X射线衍射以及维氏硬度，弯曲强度和断裂韧性测试，研究了不同的TaC /（TaC + WC）重量比对金属陶瓷的微观结构和力学性能的影响。结果表明，随着TaC /（TaC + WC）重量比的增加，CoW ₂ B ₂杂质相逐渐减少直至消失。Ti（C，N）的主峰（（200））逐渐向左移动，晶格参数增加。金属陶瓷的微结构分析表明，孔隙率先升高然后降低。如此制成的金属陶瓷包含三种类型的芯环结构晶粒：黑色芯灰色环，深灰色芯灰色环和深灰色芯白色内环，外层带有灰色。随着TaC /（TaC + WC）重量比的增加，环相的厚度逐渐增加。金属陶瓷的维氏硬度，弯曲强度和断裂韧性先增大到最大值，然后减小。当重量比为0.4，最大值分别为2052 HV ₁₀，998兆帕，和7.68兆帕米^1/2分别。