To solve the poor sinterability and wettability between TiN ceramic and pure metal via using coated composite powders, dense TiN‐Ni cermets with uniform microstructure and fine grains were developed at a low sintering temperature of 1300℃ in this work. TiN powders were firstly activated in a strong acid solution, in order to achieve a step‐like surface; Ni‐coated TiN powders showed an uniform and controllable morphology. Two types of TiN‐Ni cermets based on conventional milled powders and Ni‐coated TiN composite powders were fabricated by spark plasma sintering (SPS), and used for the comparison concerning the sintering behavior, microstructure and related mechanical properties. Results showed that Ni‐coated TiN composite powders helped to improve the sinterability between ceramic and metal, which is rather beneficial to obtain dense TiN‐Ni cermets with homogeneous microstructure and high mechanical properties. Compared to those of conventional TiN‐Ni, the relative density, Rockwell hardness and fracture toughness increased from 84.9% to 96.6%, 80.2 to 84.3, and 10.2 MPa·m^1/2 to 14.7 MPa·m^1/2, with a rather low sintering temperature of 1300 ℃, respectively.

中文翻译：

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使用镀镍的TiN粉末可提高烧结性，微观结构和机械性能的致密TiN-Ni金属陶瓷

为了通过使用涂层复合粉末解决TiN陶瓷与纯金属之间的差的可烧结性和润湿性，本工作在1300℃的低烧结温度下开发了具有均匀组织和细晶粒的致密TiN-Ni金属陶瓷。首先在强酸溶液中活化TiN粉末，以形成阶梯状的表面；镀镍的TiN粉末显示出均匀且可控的形貌。通过火花等离子体烧结（SPS）制备了两种基于传统研磨粉和Ni涂层TiN复合粉的TiN-Ni金属陶瓷，并用于比较烧结性能，微观结构和相关的机械性能。结果表明，镀镍的TiN复合粉末有助于改善陶瓷与金属之间的烧结性，这对于获得具有均匀的微观结构和高机械性能的致密TiN-Ni金属陶瓷是非常有益的。与传统的TiN-Ni相比，相对密度，洛氏硬度和断裂韧性分别从84.9％增加到96.6％，80.2增加到84.3和10.2 MPa·m^1/ 2〜14.7 MPa·m ^1/2，烧结温度较低，分别为1300℃。