Al涂层修复对DD5合金性能的影响  

Effect of Al Coating Repair on Properties of DD5 Alloy

作　　者：蔡妍 李建平 汤智慧 牟仁德 CAI Yan;LI Jian-ping;TANG Zhi-hui;MU Ren-de(Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,Beijing Institute of Aeronautical Materials,AECC,Beijing 100095,China)

机构地区：[1]中国航发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》2020年第11期108-113,共6页Equipment Environmental Engineering

基　　金：财政部稳定支持基础研究项目(KZ0C190540)。

摘　　要：目的研究Al涂层修复对DD5合金性能的影响。方法采用化学气相沉积技术(CVD)在二代单晶镍基高温合金DD5上制备了Al涂层,通过化学方法完全退除基体上的涂层,采用HB 5258进行1100℃热冲击试验,通过试验过程中试样质量变化来评价涂层的热态结合力,并且通过高温持久、高温瞬时拉伸等力学实验来评价涂层退除再涂覆后对基体合金的力学性能的影响,通过扫描电镜(SEM)分析涂层退除前后表面形貌。结果DD5合金试样和Al涂层试样在退除溶液中退除60 min后,涂层/合金界面微观组织形貌、成分基本不变;退除再涂覆后Al涂层在“空冷”条件下进行1100℃试验,热冲击次数大于2000次,涂层试样表面没有出现明显的涂层剥落;涂层退除再涂覆对合金的力学性能不造成明显影响。结论Al涂层修复对Al涂层和DD5合金性能基本无影响。The work aims to observe the effect of Al coating repair on properties of DD5 alloy.Al coatings were deposited on the DD5 single crystal alloy substrate by CVD.The coatings on the substrate were fully removed via chemical methods.The high temperature thermal shock test was carried out at 1100℃through HB 5258.The thermal adhesion of coatings was assessed through mass change during test.Through mechanical experiments such as high-temperature durability and high-temperature instantaneous tension,the influence of coating removal and recoating on the mechanical properties of substrate alloy was evaluated.The coatings before and after removal were characterized by scanning electron microscopy.The microstructure and elements at Al coating/DD5 alloy interface did not change after removal for 60 min in removing solution.The Al coatings after removal and recoating were tested at 1100℃under the condition of“air cooling”,and when the thermal shock times were more than 2000,there was no obvious coating spalling on the surface of the coating sample.Coating removal and recoating had no obvious influence on the mechanical properties of the alloy.Al coating repair apparently has no effect on properties of DD5 alloy.

关 键 词：AL涂层 CVD DD5合金 退除工艺 化学法 

分 类 号：TG174.4[金属学及工艺—金属表面处理]