脉冲频率及占空比对Ti6Al4V合金微弧氧化膜层微观结构及性能的影响

doi:10.13251/j.issn.0254-6051.2023.06.002

摘要/Abstract

摘要： 研究了脉冲频率及占空比对Ti6Al4V合金在Na₂SiO₃-Na(PO₄)₆电解液体系中制备的微弧氧化膜层微观结构及其性能的影响, 采用扫描电镜、能谱仪、X射线衍射仪、涂层厚度仪、激光共聚焦显微镜及显微硬度计对膜层形貌、元素分布、相组成、厚度、粗糙度及硬度进行测试表征。结果表明, Ti6Al4V合金微弧氧化膜层主要元素组成为Ti、O、Si等, 物相组成主要为Rutile-TiO₂、Anatase-TiO₂及非晶相SiO₂, 随脉冲频率增加, 膜层中Anatase衍射峰强度先降低后增加, Rutile呈相反趋势;随脉冲占空比增大, Anatase衍射峰强度逐渐减小, 而Rutile衍射峰强度逐渐增加。膜层表面均匀分布微米级孔洞, 脉冲频率对膜层微观形貌及粗糙度影响较小, 膜层厚度先增大后减小;随占空比增加, 膜层快速增厚, 但表面逐渐出现微裂纹及局部烧蚀等缺陷, 膜层粗糙度大幅增加, 600 Hz、20%占空比时膜层厚度达45.46 μm, 粗糙度R_a为4.75 μm。随脉冲频率及占空比增加, 膜层显微硬度均呈现先增大后减小的变化规律, 频率600 Hz、占空比20%时达最大值863.2 HV0.5, 相比Ti6Al4V合金提高了149.5%。

关键词: Ti6Al4V合金, 微弧氧化, 脉冲频率, 占空比

Abstract: Effects of pulse frequency and duty ratio on microstructure and properties of microarc oxidation coatings prepared on Ti6Al4V alloy in Na₂SiO₃-Na(PO₄)₆ electrolyte system were studied. The morphology, element distribution, phase composition, thickness, roughness and microhardness of the coatings were characterized by means of scanning electron microscope, energy dispersive spectrometer, X-ray diffractometer, coating thickness meter, laser confocal microscope and microhardness tester. The results show that the main elements of Ti6Al4V alloy microarc oxidation coatings are Ti, O and Si. The phase composition is mainly Rutile-TiO₂, Anatase-TiO₂ and amorphous SiO₂. With the increase of pulse frequency, the intensity of Anatase diffraction peak in the coating decreases first and then increases, whereas Rutile shows the opposite trend. With the increase of pulse duty ratio, the intensity of Anatase diffraction peak decreases, while that of Rutile diffraction peak increases. Micro-holes are uniformly distributed on the surface of the coatings. Pulse frequency has little effect on the microstructure and roughness, and the thickness increases first and then decreases. With the increase of duty ratio, the thickness increase rapidly, but the surface gradually appears microcracks and local ablation defects, causing the roughness increase rapidly. The thickness reaches 45.46 μm and the roughness R_a is 4.75 μm at 600 Hz and 20% duty ratio. With the increase of pulse frequency and duty ratio, the microhardness of coatings increases first and then decreases. The maximum microhardness is 863.2 HV0.5 at 600 Hz and 20% duty ratio, compared with Ti6Al4V alloy, the increase is 149.5%.

Key words: Ti6Al4V alloy, microarc oxidation, pulse frequency, duty ratio

中图分类号:

TG174.41

陈宇科, 原梅妮, 周鹏飞, 杭瑞月, 李茂华. 脉冲频率及占空比对Ti6Al4V合金微弧氧化膜层微观结构及性能的影响[J]. 金属热处理, 2023, 48(6): 9-15.

Chen Yuke, Yuan Meini, Zhou Pengfei, Hang Ruiyue, Li Maohua. Effect of pulse frequency and duty ratio on microstructure and properties of microarc oxidation coating on Ti6Al4V alloy[J]. Heat Treatment of Metals, 2023, 48(6): 9-15.

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