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为提高钛合金表面力学性能,利用钛合金基体与TiB2粉末之间的原位反应,在TC4钛合金表面激光熔覆原位制备了TiB陶瓷涂层。采用扫描电镜(SEM)和X射线衍射仪(XRD)分析了熔覆层的形貌、显微组织与陶瓷相分布,并用硬度计测试了显微硬度。结果表明,在实验优化的工艺参数下,可制备出无气孔、无裂纹与表面质量较好的熔覆层。熔覆层的显微组织由表及里从块状颗粒转变为细针状组织;TiB2陶瓷相由表及里逐渐减少,而TiB陶瓷相由表及里逐渐增多;熔层表面显微硬度高,并由表及里呈现出梯度变化。
In order to improve the mechanical properties of titanium alloy surface, TiB ceramic coating was prepared in-situ by laser cladding on the surface of TC4 titanium alloy by the in-situ reaction between the titanium alloy substrate and TiB2 powder. The morphology, microstructure and ceramic distribution of the coating were analyzed by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The microhardness was tested by hardness tester. The results show that under the optimal experimental process parameters, the coatings with no pores, no crack and good surface quality can be prepared. The microstructure of the cladding layer from the table and from the massive particles into fine needle-like organization; TiB2 ceramic phase from the table and gradually reduced, while the TiB ceramic phase from the table and gradually increased; melt surface microhardness high , And from the table shows a gradient change.