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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。
Using Ti and h-BN as raw materials, the laser cladding method was used in the Ti-3Al- TiV / TiN composite coatings were synthesized in-situ on the surface of 2V coatings. The microstructure of the coatings was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron probe spectroscopy (EPMA) and transmission electron microscopy (TEM) , Hardness and friction test to test the physical properties of the coating. The results show that: 1) the content of B element has an important influence on the microstructure and distribution of the coating; 2) nucleation and growth occur when the B element in the bath satisfies the concentration of TiB, Grain boundary and nucleation and growth; 3) With the increase of BN content, the microhardness and tribological properties of the cladding layer increase, the maximum hardness reaches 5 times of the matrix, the friction loss per unit time of the cladding layer is not To half the amount of substrate wear.