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 Al2 O3-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：Al2 O3-3％TiO2涂层中存在大量的γ-Al2 O3相、α-Al2 O3相以及少量的非晶相；在Al2 O3-13％TiO2涂层中,非晶相含量出现最大值,并有Al2 TiO5相形成；随着TiO2含量进一步增加,非晶相含量降低,Al2 TiO5相含量增加,在Al2 O3-40％TiO2涂层中只存在α-Al2 O3和Al2 TiO5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Al2 TiO5相的含量有关。
Four kinds of Al2 O3-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 ofγ-Al2 O3 ,α-Al2 O3 and a small quantity of amorphous phase in Al2 O3-3wt%TiO2 coating;the maximum value of the amorphous content appears,and Al2 TiO5 phase forms in Al2 O3-13wt%TiO2 coating.With the further increase of the TiO2 content,the amount of the amorphous phase decreases,and Al2 TiO5 phase′s content increases in coatings.There are onlyα-Al2 O3 and Al2 TiO5 phases in the Al2 O3-40wt%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 Al2 TiO5 phase.
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