Pt/Zr共改性铝化物涂层的抗高温氧化性能研究  

High Temperature Oxidation Resistance of Pt/Zr-modified Aluminide Coating

作　　者：范其香[1] 王铁钢[1] 谭晓晓[2] 霍文国[1] FAN Qixiang;WANG Tiegang;TAN Xiaoxiao;HUO Wenguo(Tianjin University of Technology and Education,Tianjin Key Laboratory of High Speed Cutting and Precision Machining,Tianjin 300222,China;Shanghai University of Engineering Science,School of Materials Engineering,Shanghai 201620,China)

机构地区：[1]天津职业技术师范大学天津市高速切削与精密加工重点实验室,天津300222 [2]上海工程技术大学材料工程学院,上海201620

出　　处：《腐蚀科学与防护技术》2018年第4期395-400,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金(51501130和51501109);天津市应用基础与前沿技术研究计划(15JCZDJC39700和14JCQNJC05100);天津市高等学校创新团队培养计划(TD13-5096)~~

摘　　要：采用电镀Pt和化学气相沉积Al-Zr共渗两步法制备了一种Pt/Zr共改性铝化物涂层,并对其进行了组织结构表征和1000℃抗高温氧化性能测试。结果表明:Pt/Zr共改性铝化物涂层外层主要相为β-(Ni,Pt)Al,同时含有少量的PtAl_2和PtZr相。在1000℃氧化300 h后,Pt改性铝化物涂层和Pt/Zr共改性铝化物涂层中均有大量的有益相β-NiAl存在,表现出很好的抗高温氧化性能;Pt/Zr共改性铝化物涂层比单一的Pt改性铝化物涂层具有更低的氧化速率,其表面氧化膜也更加致密,这是因为在保护性的Al2O3膜下方形成了条状的富Zr氧化物,可以起到钉扎的作用。A Pt/Zr-modified aluminide coating on a directionaly solidified Ni-based superalloy was prepared via a two-step process, namely a Pt thin layer was firstly electrodeposited on the alloy and then which was zirconium-aluminized through pack cementation. The isothermal oxidation behavior of the alloy with Pt/Zr-modified aluminide coating at 1000 ℃ was examined in air, and results showed that the main phase in the outer part of the Pt/Zr-modified aluminide coating was β-（Ni, Pt） Al phase with little PtAl2 and PtZr phases. There was abundant beneficial β-NiAl phase remaining in both the Pt-modified aluminide coating and Pt/Zr-modified aluminide coating indicating that the two coatings possessed good oxidation resistance. But the Pt/Zr-modified aluminide coating possessed lower oxidation rate and denser oxide scale than the Pt-modified aluminide coating, which might be due to that some strip-like oxide pegs rich in Zr formed beneath the alumina scale and which played a role in anchoring the oxide scale.

关 键 词：镍基高温合金 Pt改性铝化物涂层 ZR 组织形貌 抗高温氧化性能 

分 类 号：TG174[金属学及工艺—金属表面处理]