A hard and thick surface strengthening layer with high interfacial bonding strength was innovatively prepared via self-propagating high temperature synthesis (SHS) combined with hot pressing sintering (HPS) process. The thickness of the surface layer reached 1.1 mm, far exceeding the strengthening layer prepared by the traditional surface modification methods of titanium alloy. The raw materials of the hard layer were carefully designed by mixing powders of Ti, C, B and Ni, and the raw material of the matrix was Ti-6Al-4V powder. During the HPS process (1100°C, 40MPa), the Ti-Ni reaction released a large amount of heat, which promoted the Ti-C reaction and Ti-B reaction. The test results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) suggested that a high amount of Ti₆C_3.75 and TiB were finally generated in the hard layer, and the Vickers hardness value was as high as 1800 HV. Furthermore, the energy dispersive spectrometer (EDS) test results indicated that most Ni atoms diffused to the Ti-6Al-4V side, and NiTi₂ phase was mainly distributed at the interface. Obviously, metallurgical bonding was obtained, accounting for the high interfacial bonding strength of 162 MPa. The present work provided significant insights into the design of novel titanium alloy surface modification process.

通过自蔓延高温合成（SHS）结合热压烧结（HPS）工艺，创新性地制备了具有高界面结合强度的硬而厚的表面强化层。表层厚度达到1.1mm，远超钛合金传统表面改性方法制备的强化层。硬质层原料采用Ti、C、B、Ni粉末混合精心设计，基体原料为Ti-6Al-4V粉末。在HPS过程中（1100℃，40MPa），Ti-Ni反应放出大量热量，促进了Ti-C反应和Ti-B反应。X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 的测试结果表明，大量的 Ti_{最终在硬质层生成6} C _3.75和TiB，维氏硬度值高达1800 HV。此外，能量色散谱仪（EDS）测试结果表明，大部分Ni原子向Ti-6Al-4V侧扩散，NiTi ₂相主要分布在界面处。显然，获得了冶金结合，占 162 MPa 的高界面结合强度。目前的工作为新型钛合金表面改性工艺的设计提供了重要的见解。