Titanium alloy is a major structural material with excellent high specific strength in aerospace applications. Cubic boron nitride (cBN) is a synthetic wear-resistant material with high hardness, similar to that of diamond, that is used in mechanical cutting and grinding. In addition, the thermal stability of cubic boron nitride particles is much better than that of diamond. In order to further enhance the wear resistance of the Ti6Al4V alloy, the laser cladding (LC) technology characteristics of metallurgical bonding were used to prepare cubic boron nitride/Ti6Al4V and Ni-plated cubic boron nitride/Ti6Al4V composite coatings on Ti6Al4V substrates in this paper. However, in the laser molten pool, it is difficult to retain the raw properties of cubic boron nitride particles under laser radiation. Both composite coatings were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The microstructures and interface bonding between cubic boron nitride particles and the Ti6Al4V matrix were examined using SEM, and the wear resistance and the worn track morphology of the composite coatings were evaluated using the ball-on-disc wear test and step profiler (WTM-2E). The results indicated that the Ni-plated cubic boron nitride/Ti6Al4V composite coating showed fewer thermal defects in comparison with the cubic boron nitride/Ti6Al4V coating. The Ni plating on the surface of cubic boron nitride particles was able to avoid the generation of thermal cracking of the cubic boron nitride particles in the composite coating. The TiN reaction layer was formed between the cubic boron nitride particles and Ti6Al4V matrix, which effectively prevented the further decomposition of the cubic boron nitride particles. The XRD and XPS results confirmed that the TiN reaction layer formed between the cubic boron nitride particles and Ti6Al4V. The Ni plating on the surface of the cubic boron nitride particles was also beneficial for increasing the wear resistance of the composite coating.

中文翻译：

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用Ti6Al4V基底激光熔覆制备的纯硬或镀镍立方氮化硼颗粒增强的Ti6Al4V复合涂层的组织演变和耐磨性比较

钛合金是一种主要的结构材料，在航空航天应用中具有出色的高比强度。立方氮化硼（cBN）是一种高硬度的合成耐磨材料，类似于金刚石，用于机械切割和研磨。另外，立方氮化硼颗粒的热稳定性比金刚石好。为了进一步提高Ti6Al4V合金的耐磨性，本文利用冶金学的激光熔覆（LC）技术特征在Ti6Al4V基底上制备立方氮化硼/ Ti6Al4V和镀镍立方氮化硼/ Ti6Al4V复合涂层。 。但是，在激光熔池中，难以在激光辐射下保持立方氮化硼颗粒的原始性质。使用扫描电子显微镜（SEM），能量色散光谱（EDS），X射线衍射（XRD）和X射线光电子能谱（XPS）对两种复合涂层进行了分析。使用SEM检查立方氮化硼颗粒与Ti6Al4V基体之间的微观结构和界面结合，并使用圆盘球磨耗试验和阶梯轮廓仪（WTM-2E）评估复合涂层的耐磨性和磨损痕迹形态）。结果表明，与立方氮化硼/ Ti6Al4V涂层相比，镀镍的立方氮化硼/ Ti6Al4V复合涂层的热缺陷更少。在立方氮化硼颗粒表面镀镍能够避免在复合涂层中产生立方氮化硼颗粒热裂。TiN反应层形成在立方氮化硼颗粒和Ti6Al4V基体之间，有效地阻止了立方氮化硼颗粒的进一步分解。XRD和XPS结果证实在立方氮化硼颗粒和Ti6Al4V之间形成了TiN反应层。立方氮化硼颗粒表面的镍镀层也有利于增加复合涂层的耐磨性。