Ta含量对NiCoCrAlY涂层性能的影响  

Effect of Ta on High Temperature Performance of NiCoCrAlY Coatings

作　　者：陈建国 张淑婷 杜开平 欧阳佩旋 Jianguo Chen;Shuting Zhang;Kaiping Du;Peixuan Ouyang(Beijing Aerospace Unmanned Vehicles System Engineering Research Institute,Beijing,100094;School of Mechanical and Materials Engineering,North China University of Technology,Beijing,100144;BGRIMM Technology Group,Beijing 100160)

机构地区：[1]北京航天无人机系统工程研究所,北京,100094 [2]北方工业大学机械与材料工程学院,北京,100144 [3]北京矿冶科技集团有限公司,北京,100160

出　　处：《热喷涂技术》2019年第3期38-43,共6页Thermal Spray Technology

基　　金：北京市教育委员会科技计划重点项目（KZ201910009010）

摘　　要：采用真空雾化的方法制备了Ta含量为0、2%及5%的NiCoCrAlYTa合金粉末,利用超音速火焰喷涂制备了三种涂层,研究了Ta对合金粉末微观组织及物相的影响,绘制了1050℃条件下涂层的高温氧化动力学曲线,研究了500h氧化试验后涂层组织和β相的分布,初步探讨了Ta元素对改善涂层抗氧化性能的作用机理。研究结果表明:Ta通过提高MCrAlY体系抗氧化元素的溶质浓度,促进了氧化膜的形成,随着Ta含量的增加,涂层的内氧化程度降低,涂层抗氧化性能提高。但含Ta涂层在长时间氧化条件下会生成CrTaO4、AlTaO4等尖晶石类氧化物,且Ta的氧化物PBR值较大,对涂层的抗热震性能不利。The NiCoCrAlYTa alloy powder with a Ta concentration of 0,2%and 5%was prepared by vacuum atomization.The coatings were prepared on Ni-based superalloy GH536 by HVOF.The effect of Ta element on the structure and phase of the alloy powder was analyzed.The oxidation kinetics curves of NiCoCrAlYTa coating were described.In addition,the coating structure andβphase distribution after 500 hours oxidation is also discussed.The results show that Ta element changes the concentration of antioxidant elements and coating internal oxidation,which improves the oxidation resistance of NiCoCrAlYTa.However,the coating containing Ta will generate spinel oxides such as CrTaO4 and AlTaO4 in the condition of long-term oxidation,and Ta has a large PBR value,which is adverse to the thermal shock resistance of the coating.

关 键 词：NiCoCrAlYTa 涂层 高温氧化 抗热震性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]