采用预置粉末式激光熔覆法在钛合金(Ti-6Al-4V)表面开展了 Al2 O3-13%(质量分数)TiO2涂层的研究。利用光学显微镜(OM)、扫描电子显微镜(SEM)、X 射线衍射分析仪(XRD)和显微硬度计研究了激光熔覆熔池的特征和涂层的显微结构,分析了涂层的成分分布、相组成和显微硬度分布情况。预置粉末激光熔覆制备的 Al2 O3-13%(质量分数)TiO2涂层界面结合良好,涂层组织均匀,没有明显的裂纹和气孔。激光熔覆涂层表现出明显流线型特征,熔覆层截面分为热影响区、扩散结合区和涂层区。涂层由 Ti、AlTi3、α-Al2 O3和γ-Al2 O3等相组成。涂层的显微硬度达到1000~1300 HV0.3,比基体硬度360~390 HV0.3高2倍。
The preparation of Al2 O3-13wt%TiO2 coating was studied on the surface of Ti-6Al-4V alloy by laser cladding with preset powder.Optical microscope (OM),scanning electron microscope (SEM),X-ray diffractometer (XRD)and vickers microhardness tester were used to examine the characteristics of the molten pool,the microstruc-ture,composition distribution,phase constituents and microhardness of the coating.The microstructure of the coating was uniform without obvious cracks and pores.Laser cladding coatings presented streamlined features.The coating section is divided into heat affected zone,diffusion zone and coating zone.The coating consists of Ti,AlTi3 ,α-Al2 O3 and γ-Al2 O3 phase.The microhardness of the substrate is 360 - 390 HV0.3 ,while the coatings reach 1000 - 1300 HV0.3 ,which is about two times higher than that of the substrate.
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