摘要
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。
The effects of phosphoric acid chemical treatment and composite SlOe coating on oxidation resistance of Ti-6A1-4V alloy were investigated. Results show that, the average oxidation rate of the Ti-6A1-4V alloy treated by phosphoric acid decreases nearly by 75%in comparison with the blank samples at 600℃ after 24h oxidation in air. The oxidation rate of composite SlOe coating sample re- duces one order of magnitude in comparison with the blank sample oxidation for 100h at the same con- dition. The composite SiO2 coating has better anti-oxidation ability than phosphoric acid treatment. The compactness of the oxide scale of the composite SiO2 coating and the phosphoric acid treatment samples increases, and a good adhesion with the substrate is shown, the volume fractions of TiO2 in oxidation films reduce both phosphoric acid chemical treatment and composite SiO2 coating samples. The in-diffusion of O and out-diffusion of Ti are restrained because of the formation of TiP2O7 phase and deposit SiO2 coating.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2013年第5期62-66,72,共6页
Journal of Materials Engineering
基金
辽宁省教育厅科学研究项目(L2011062)
