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采用硬质阳极氧化技术为6061蜂窝制备了54μm厚的Al_2O_3硬质涂层,并采用X射线衍射技术测试了不同热载荷后合金表面的残余应力。之后利用扫描电镜对不同热载荷涂层的截面形貌进行了表征,研究了热载荷对涂层和基体残余应力的影响,并基于理论模型对这种残余应力进行了估算。不同热载荷条件下基体表面的残余应力值与估算结果吻合较好。研究结果表明:涂层由γ-Al_2O_3物相组成;在400~500℃范围内,随着热载荷温度的增加,涂层处的裂纹增加,但涂层与基体结合良好;600℃后涂层出现大量裂纹,并且在界面处出现严重的脱层现象。
The hard anodization technology was used to prepare a 54μm Al_2O_3 hard coating for 6061 honeycomb. The residual stress of the alloy surface after different thermal loads was tested by X-ray diffraction. After that, the cross-sectional topography of different heat-loaded coatings was characterized by scanning electron microscopy. The influence of thermal load on the residual stress of the coating and matrix was investigated. The residual stress was estimated based on the theoretical model. The residual stress of the substrate surface under different thermal loading conditions is in good agreement with the estimation results. The results show that the coating is composed of γ-Al 2 O 3 phase. In the temperature range of 400-500 ℃, the cracks at the coating increase with the increase of the heat load temperature, but the coating is well bonded with the substrate. After 600 ℃ coating A large number of cracks appear and severe delamination occurs at the interface.