采用等离子喷涂工艺在灰铸铁基体上制备了4种TiO₂含量不同的Al₂O₃-TiO₂涂层，运用X射线衍射技术，并结合Rietveld全谱拟合方法，对不同涂层中的物相进行定量分析；采用显微硬度测试和拉伸试验研究TiO₂含量对涂层力学性能的影响。结果表明：Al₂O₃-3% TiO₂涂层中存在大量的γ-Al₂O₃相、α-Al₂O₃相以及少量的非晶相；在Al₂O₃-13% TiO₂涂层中，非晶相含量出现最大值，并有Al₂TiO₅相形成；随着TiO₂含量进一步增加，非晶相含量降低，Al₂TiO₅相含量增加，在Al₂O₃-40% TiO₂涂层中只存在α-Al₂O₃和Al₂TiO₅相；随着TiO₂含量增加，涂层的显微硬度降低，但涂层的结合强度升高，这与涂层中Al₂TiO₅相的含量有关。

Four kinds of Al₂O₃-TiO₂ coatings with different TiO₂ contents were prepared on cast iron substrate by plasma spraying. X-ray diffraction (XRD) technique combined with the Rietveld whole pattern fitting method was used to determine the phase's content in different coatings. The effects of TiO₂ content on mechanical properties of the coatings were investigated by means of the microhardness measurement and tensile testing. The results indicate that there are a large amount of γ-Al₂O₃, α-Al₂O₃ and a small quantity of amorphous phase in Al₂O₃-3wt%TiO₂ coating; the maximum value of the amorphous content appears, and Al₂TiO₅ phase forms in Al₂O₃-13wt%TiO₂ coating. With the further increase of the TiO₂ content, the amount of the amorphous phase decreases, and Al₂TiO₅ phase's content increases in coatings. There are only α-Al₂O₃ and Al₂TiO₅ phases in the Al₂O₃-40wt%TiO₂ coating. The microhardness of the coatings decrease but the adhesion strength enhance with the increase of TiO₂ contents, this can be attributed to the formation of the Al₂TiO₅ phase.