涡轮叶片NiCoCrAlYTa涂层抗高温氧化和腐蚀性能测试研究  

High Temperature Oxidation and Corrosion Property Test of NiCoCrAlYTa Coating on Turbine Blade

作　　者：刘德林 牟仁德 陆峰 LIU De-lin;MU Ren-de;LU Feng(Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室,北京100095

出　　处：《装备环境工程》2018年第11期54-59,共6页Equipment Environmental Engineering

摘　　要：目的保障涡轮叶片的安全可靠应用,研究NiCoCrAlYTa涂层的高温氧化和燃气热腐蚀行为。方法针对有无涂层的涡轮叶片试样,分别进行1050℃/100 h的抗氧化试验和950℃/100 h的燃气热腐蚀试验,同时分析试验后合金基体和涂层的微观形貌。结果抗氧化试验后,无涂层试样的平均氧化皮脱落量和平均氧化速率分别是带涂层试样的10倍和3倍左右,无涂层试样叶身表面可见大量氧化皮脱落形成的凹坑,带涂层试样的涂层完好,基体未见氧化特征。燃气热腐蚀试验后,无涂层试样的腐蚀速率是带涂层试样的3倍,无涂层试样叶身表面可见较多腐蚀坑,有涂层试样的涂层未被明显腐蚀。结论 NiCoCrAlYTa涂层在经过长时间高温氧化和腐蚀后仍能形成完整的Al_2O_3膜,从而起到较好的保护作用。Ta、Y等元素对Al_2O_3氧化膜的形成及质量具有促进作用。Objective To insure security application of turbine blade and study temperature oxidation and corrosion behav-iors of NiCoCrAlYTa coating. Methods For turbine blades with coating and without coating, the anti-oxidation test at 1050 ℃for 100 hours and gas hot-corrosion test at 950 for 100 hours were carried out. After tests, microscopic features of substrate ℃and coating were observed and analyzed. Results The average amount of oxide peeling and average oxidation rate of uncoated samples were 10 times and 3 times that of coated samples after anti-oxidation test. There were pits on the surface of the un-coated samples. The coating of the coated samples was intact and the substrate had no oxidation characteristics. After gas hot-corrosion test, the corrosion rate of uncoated samples was 3 times that of coated samples; and there were a large number of corrosion pits on the surface of uncoated samples. The coating of the coated samples was significantly corroded. Conclusion After a long period of high temperature oxidation and corrosion, the NiCoCrAlYTa coating can still form a complete Al2O3 ox-ide film, which can play a good protective role. Tantalum and yttrium elements can promote the formation and quality of the Al2O3 oxide film.

关 键 词：NICOCRALYTA涂层 高温氧化 燃气热腐蚀 Al2O3膜 

分 类 号：TG174.442[金属学及工艺—金属表面处理]