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采用电弧离子镀(AIP)技术在Ti62421s钛合金基体表面沉积CrN涂层。测定了Ti62421s钛合金和CrN涂层/钛合金基体试样在700~900℃氧化时的动力学曲线,进而通过扫描电镜(SEM)、能谱(EDS)分析与X射线衍射分析(XRD)研究Ti62421s钛合金及CrN涂层/钛合金界面在800℃及900℃氧化前后的显微组织和物相组成。结果表明:在700~900℃静态空气中氧化200h过程中,CrN涂层对钛合金基体有很好的保护作用。在800℃和900℃静态空气中氧化200 h后,Ti62421s钛合金表面形成TiO2、Al2O3氧化膜。CrN涂层/钛合金基体试样在800℃氧化200 h后,CrN涂层表面生成片层状Cr2O3膜;在900℃氧化200 h后,涂层中发生CrN向Cr2N的相转变,涂层的抗氧化能力降低。800℃和900℃分别氧化200 h后,CrN涂层/钛合金基体界面处形成Ti2N相。
CrN coating was deposited on the surface of Ti62421s titanium alloy by arc ion plating (AIP). The kinetic curves of Ti62421s and CrN coated / titanium alloy substrates at 700-900 ℃ were measured. The kinetic curves of the samples were analyzed by SEM, EDS and X-ray diffraction (XRD) Microstructure and Phase Composition of Ti62421s Titanium Alloy and CrN Coating / Titanium Alloy Interface before and After Oxidation at 800 ℃ and 900 ℃. The results show that the CrN coating has a good protective effect on the titanium alloy substrate during oxidation in static air at 700-900 ℃ for 200 h. After being oxidized in static air at 800 ℃ and 900 ℃ for 200 h, TiO2 and Al2O3 films were formed on the surface of Ti62421s titanium alloy. CrN coating / titanium alloy substrate samples after oxidation at 800 ℃ for 200 h, the surface CrN coating lamellar Cr2O3 film; oxidation at 900 ℃ for 200 h, the coating occurs CrN to Cr2N phase transition coating Antioxidant ability is reduced. After oxidation at 800 ℃ and 900 ℃ for 200 h, the Ti2N phase was formed at the interface of CrN coating / titanium alloy substrate.