湿吹砂电弧离子镀AlSiY涂层的抗高温腐蚀性能  

High Temperature Corrosion Resistance of Wet Grit Blasted AIP AlSiY Coating

作　　者：李汉运 王博 彭新[3] 杨霖 袁福河 LI Hanyun;WANG Bo;PENG Xin;YANG Lin;YUAN Fuhe(Technical Center,AECC Shenyang Liming Aeroengine Corporation Ltd.,Shenyang 110043,China;Beihang University,Beijing 100191,China;Shenyang Area 2nd Military Representative Room of Air Force Equipment Department,Shenyang 110043,China;Heat and Surface Treatments Factory,AECC Shenyang Liming Aeroengine Corporation Ltd.,Shenyang 110043,China)

机构地区：[1]中国航发沈阳黎明航空发动机有限责任公司技术中心,沈阳110043 [2]北京航空航天大学,北京100191 [3]空装驻沈阳地区第二军事代表室,沈阳110043 [4]中国航发沈阳黎明航空发动机有限责任公司热表处理厂,沈阳110043

出　　处：《航空制造技术》2022年第15期75-81,共7页Aeronautical Manufacturing Technology

基　　金：国家科技重大专项(2017–Ⅶ–0007–0100)。

摘　　要：为解决和减轻航空发动机及燃气轮机高压涡轮叶片合金表面的高温腐蚀问题,采用空心阴极电弧离子镀技术在DZ22定向凝固镍基高温合金表面沉积AlSiY涂层。结果表明,沉积的AlSiY涂层经过高温真空扩散热处理后由表面层、中间层和薄的内扩散层组成,为β–NiAl单相金属间化合物合金,具有高活度扩散渗铝涂层的组织特征。热腐蚀热重分析以及对涂层截面形貌观察结果说明湿吹砂处理显著改善了涂层抗涂盐及燃气高温腐蚀性能。未湿吹砂处理的AlSiY扩散涂层表面的涂盐和燃气热腐蚀产物皆为Al_(2)O_(3)和NiAl_(2)O_(4),氧化膜较厚且涂层内有孔洞形成,涂层几乎全部退化成了γ′–Ni_(3)Al相。经过湿吹砂处理的AlSiY扩散涂层的涂盐和燃气热腐蚀产物都以Al_(2)O_(3)为主,生成的氧化铝膜薄而致密,显著改善涂层的抗高温热腐蚀性能,从而延长涂层的使用寿命。AlSiY coating was deposited on the directionally solidified DZ22 superalloy using an arc ion plating technique in an aim to resolve or alleviate the high temperature corrosion damage of high pressure turbine blades for aero-engines and gas turbine engines.The attained results demonstrate that the AlSiY coating deposited and vacuum diffusion heat treated at a high temperature consists of an outer,an intermediate and a thin inner diffusion layer,which is typical of a high activity aluminide diffusion coating composed of the singleβ–NiAl intermetallic phase.The results of thermogravimetric analyses and examinations of cross sections demonstrated that the wet grit blasting process improves significantly the corrosion resistance of the AlSiY coating under salt film and hot-gas conditions.A thick oxide scale developed on the as-diffusion heat treated coating consists primarily of Al_(2)O_(3) and NiAl_(2)O_(4) corrosion products under salt film and hot-gas corrosion conditions,and most of the coating degenerated into theγ′–Ni_(3)Al phase with some pores formed inside.Wet grit blasting of the heat treated AlSiY coating is desirable to promote the selective oxidation of aluminium,chromium elements and formation of a thin,denser alumina scale under both corrosion conditions,thereby enhance remarkably the high temperature corrosion resistance and prolong the service life of the arc ion plated AlSiY coating.

关 键 词：电弧离子镀(AIP) 铝化物涂层 AlSiY 热扩散 湿吹砂 高温热腐蚀 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程] TK476[动力工程及工程热物理—动力机械及工程] TG174.4[金属学及工艺—金属表面处理]