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材料工程  2013 

磷酸表面处理复合SiO2涂层对Ti-6Al-4V合金抗氧化性能的影响

DOI: 10.3969/j.issn.1001-4381.2013.05.013

Keywords: 磷酸处理,SiO2涂层,等温氧化,Ti-6Al-4V合金

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Abstract:

研究磷酸表面处理和复合SiO2涂层对Ti-6Al-4V合金600℃下空气中抗氧化性能的影响。结果表明600℃氧化24h后,磷酸表面处理使Ti-6Al-4V合金平均氧化速率下降了近75%,复合非晶SiO2涂层样品600℃等温氧化100h后,平均氧化速率比空白样品降低一个数量级,抗氧化性能与单独的磷酸处理比较进一步提高。磷酸表面处理和复合SiO2涂层样品的氧化膜致密性增强且与基体的黏附性良好,二者氧化膜中TiO2的体积分数均低于空白样品。磷酸表面处理形成的TiP2O7层与SiO2涂层共同抑制了O的内扩散和Ti的外扩散。

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