以Ti和h-BN 为原料，在不同配比(Ti与BN 物质的量比分别为16∶1, 8∶1, 4∶1)的情况下，采用激光熔覆的方法在Ti-3Al-2V 的表面原位合成TiB/TiN 复合强化涂层，利用X-射线衍射(XRD)、扫描电子显微镜(SEM)、电子探针(EPMA)和透射电子显微镜(TEM)分析涂层显微组织结构，采用硬度和摩擦实验检测涂层物理性能。检测结果表明：1) B 元素的含量对涂层显微结构和分布状态有重要影响；2) 当熔池中B 元素满足形成TiB 的浓度时发生形核与生长，TiB 优先沿着TiN 晶粒晶界处形核和生长；3) 随着BN 含量的增加，熔覆层的显微硬度与耐摩擦性能增加，最大的硬度达到基体的5倍，单位时间内熔覆层的摩擦损失量不到基体磨损量的一半。

TiN-TiB/Ti based composite coating is prepared on Ti-3Al-2V by laser cladding using different molar ratios of Ti and BN, the molar ratios of Ti to BN are 16:1, 8∶1 and 4∶1, respectively. The coating is evaluated and characterized by means of X- ray diffraction (XRD), scanning electron microscope (SEM), electron probe microanalyzer (EPMA) and transmission electron microscope (TEM), micro- hardness tester and wear testing machine. The results reveal that: 1) B content has great effect on the microstructure and distribution of phase TiB; 2) TiB nucleates and grows when solubility of B is satisfied to form TiB. Besides, TiB tends to grow on the surface of TiN or grain boundary; 3) with increased BN content, the microhardness and friction performance is improved. The maximal hardness is about 5 times of the substrate. The wear depth is less than half of that of the substrate.