Different amounts of LaB₆ (0, 0.5, 1.0, 1.5, 2.0 and 2.5 wt%) were added into Ti-6Al-4V + B₄C powder mixtures for fabricated TiC+TiB_x reinforced titanium matrix composite coatings on Ti-6Al-4V surfaces by laser cladding processing. The effects of LaB₆ addition on the phase composition, microstructure, microhardness, and wear resistance of the coatings were investigated in detail. XRD and SEM results proved that the coatings mainly comprised three kinds of reinforcements such as granular TiC, rod-like TiB₂, and acicular TiB. With LaB₆ added, La₂O₃ formed in the grain boundary of rod-like TiB₂ through in-situ reaction and impeded the TiB₂ growth. The SEM showed that an appropriate amount (≤2.0 wt%) of LaB₆ addition significantly refined the coarse rod-like TiB₂ phases that were distributed in the upper area of the coatings, however, the excessive LaB₆ (≥2.5 wt%) addition reduced the grains refinement effect. The microhardness of the coating was increased with the microstructure refined. And the coating with 2 wt% LaB₆ addition had the highest microhardness (1243.4 HV_0.2) which increased to 1.23 times more than that of the coating without LaB₆ addition, while the wear mass loss was the least (0.97 × 10⁻³ g) which decreased to 29.3% that of the coating without LaB₆ addition.

将不同量的LaB ₆（0、0.5、1.0、1.5、2.0和2.5 wt％）添加到Ti-6Al-4V + B ₄ C粉末混合物中，以在Ti-6Al-上制造TiC + TiB _x增强钛基复合涂层4V表面经过激光熔覆处理。详细研究了LaB _6的添加对涂层的相组成，显微组织，显微硬度和耐磨性的影响。XRD和SEM结果表明，涂​​层主要包括颗粒状TiC，棒状TiB ₂和针状TiB三种增强材料。添加LaB _6后，在棒状TiB ₂的晶界形成La ₂ O ₃。通过原位反应并阻碍了TiB _2的生长。SEM显示，适量（≤2.0wt％）的LaB ₆添加可显着细化分布在涂层上部区域的粗棒状TiB ₂相，然而，过量的LaB ₆（≥2.5wt％）另外降低了晶粒细化效果。随着组织的细化，涂层的显微硬度增加。添加2 wt％LaB ₆的涂层具有最高的显微硬度（1243.4 HV _0.2），是不添加LaB ₆的涂层的1.23倍，而磨损质量损失最小（0.97×10 ^-3） g）降低到不添加LaB ₆的涂层的29.3％。