Microstructure evolution and mechanical properties of TiB-CoNi cermets at different sintering temperatures were investigated. A small amount of liquid phase appeared between 1362 ºC and 1398 ºC. Solid phase sintering mainly occurred below this temperature range, while liquid phase sintering mainly occurred above this temperature range. At around 1460 ºC, dissolution and re-precipitation occurred around TiB particles due to liquid phase migration. Only TiB and CoNi phases were detected on XRD patterns at different sintering temperatures. As the sintering temperature increased, the relative density, fracture toughness, transverse fracture strength, and hardness of cermets increased, while their porosity decreased. The main influencing factors on the properties of cermets sintered at 1460 ºC and above were the interface bonding strength and the grain size, while the porosity was the main influencing factor for cermets sintered below 1460 ºC.

中文翻译：

---

烧结温度对TiB2-20 wt% CoNi金属陶瓷微观结构演变和力学性能的影响

研究了不同烧结温度下 TiB-CoNi 金属陶瓷的微观结构演变和力学性能。 1362℃～1398℃之间出现少量液相。低于该温度范围主要发生固相烧结，高于该温度范围主要发生液相烧结。在 1460 ℃ 左右，由于液相迁移，TiB 颗粒周围发生溶解和再沉淀。在不同烧结温度下的 XRD 图谱上仅检测到 TiB 和 CoNi 相。随着烧结温度的升高，金属陶瓷的相对密度、断裂韧性、横向断裂强度和硬度升高，而孔隙率降低。 1460℃及以上烧结的金属陶瓷性能的主要影响因素是界面结合强度和晶粒尺寸，而1460℃以下烧结的金属陶瓷的主要影响因素是孔隙率。