Xiu Ziyang, Ju Boyu, Zhan Junhai, Chen Weidi, Yin Aiping, Zhu Xiaolin, Wang Pengjun, Wu Ping, Yang Wenshu
State Key Laboratory of Advanced Welding and Jointing, Harbin Institute of Technology, Harbin 150001, China.
Shanghai Aerospace System Engineering Research Institute, Shanghai 201108, China.
Materials (Basel). 2023 Jul 26;16(15):5259. doi: 10.3390/ma16155259.
Composite structure design is an important way to improve reinforcement strengthening efficiency. The dispersion of the external reinforcement is often not uniform enough, however, and it is agglomerated in the matrix, which cannot uniformly and effectively bear the load. The interconnected reinforcement network prepared by the in-situ self-growth method is expected to obtain higher material properties. In this paper, the TiN shell was formed on the surface of Ti powder by the in-situ nitriding method, and then the network TiN/Ti composites were prepared by sintering. In the control group, TiN was dispersed by mechanical ball milling, and it was found that TiN powder was coated on the surface of Ti particles, and the sintered TiN/Ti composites formed a discontinuous structure with a great deal of TiN agglomeration. A uniform TiN nitride layer of 5~7 μm was formed on the surface of Ti powder by the in-situ nitriding method, and a connected TiN network was formed in the sintered Ti-N/Ti composites. The composites prepared by nitriding have higher compressive strength, hardness, and plasticity. The hardness of the Ti-N/Ti composite is 685.7 HV and the compressive strength is 1468.5 MPa. On this basis, the influence of the connected TiN structure on the material properties was analyzed, which provided theoretical guidance for the structural design of the network structure-reinforced titanium matrix composites.
复合结构设计是提高增强强化效率的重要途径。然而，外部增强材料的分散往往不够均匀，在基体中会发生团聚，无法均匀有效地承受载荷。通过原位自生长法制备的相互连接的增强网络有望获得更高的材料性能。本文通过原位氮化法在Ti粉表面形成TiN壳层，然后通过烧结制备网络状TiN/Ti复合材料。在对照组中，通过机械球磨分散TiN，发现TiN粉末包覆在Ti颗粒表面，烧结后的TiN/Ti复合材料形成了大量TiN团聚的不连续结构。通过原位氮化法在Ti粉表面形成了5~7μm的均匀TiN氮化物层，在烧结后的Ti-N/Ti复合材料中形成了相互连接的TiN网络。氮化制备的复合材料具有更高的抗压强度、硬度和塑性。Ti-N/Ti复合材料的硬度为685.7 HV，抗压强度为1468.5 MPa。在此基础上，分析了连接的TiN结构对材料性能的影响，为网络结构增强钛基复合材料的结构设计提供了理论指导。
