真空热处理对热障涂层寿命及静态氧化行为的影响  

Effect of Vacuum Heat Treatment on Life and Static Oxidation Behavior of Thermal Barrier Coatings

作　　者：王攀 苏庆 王喆锦 段士昌 毛高翔 霍达 WANG Pan;SU Qing;WANG Zhejin;DUAN Shichang;MAO Gaoxiang;HUO Da(Shaanxi Huaqin Technology Industry Co.,Ltd.,Xi'an 710061,China;93147 Troops of the Chinese People's Liberation Army,Guiyang 550000,China)

机构地区：[1]陕西华秦科技实业股份有限公司,陕西西安710061 [2]中国人民解放军93147部队,贵州贵阳550000

出　　处：《热加工工艺》2025年第5期147-153,共7页Hot Working Technology

基　　金：工业与信息化部先进基础工艺人才项目(MIIT-TYBZ2412150055)。

摘　　要：分别采用大气等离子喷涂技术和超音速火焰喷涂技术在GH2747合金表面制备粘结层,采用大气等离子喷涂技术制备陶瓷层。通过等温热循环和高温静态氧化试验研究了不同工艺粘结层的热循环寿命及热生长氧化物层的生长情况。结果表明:使用超音速火焰喷涂制备的粘结层致密度大于大气等离子喷涂技术制备的粘结层,经过1050℃×2 h真空热处理后,粘结层表面形成了0.3~0.4μm厚的Al_(2)O_(3)膜。对比高温静态氧化后的粘结层组织成分和热生长氧化物层厚度得出,粘结层表面预先形成连续致密的α-Al_(2)O_(3),可以有效减缓氧气的流入,降低热生长氧化物层的生长速率,抑制混合氧化物过早的生成。致密结构的粘结层内部的氧化速率更慢,超音速火焰喷涂制备的粘结层抗氧化性强于大气等离子喷涂技术制备的粘结层。在热循环过程中,热生长氧化物层增厚和混合氧化物生成是导致涂层失效的主要因素,粘结层抗氧化性能越好,涂层的热循环寿命越大。The bonding layer was prepared on the surface of GH2747 alloy by atmospheric plasma spray(APS)and high velocity oxy-fuel spraying(HVOF),respectively,and the ceramic layer was prepared by APS.The thermal cycle life of the bonding layer and the growth of TGO(thermally grown oxide)by different processes were investigated by isothermal thermal cycling and high temperature static oxidation tests.The results show that the densification of the bonding layer prepared with HVOF is larger than that of the bonding layer prepared with APS,and a 0.3μm-0.4μm thick Al_(2)O_(3)film is formed on the surface of the bonding layer after 1050℃×2 h vacuum heat treatment.Comparing the structure composition and TGO thickness of the bonding layer after high-temperature static oxidation,it is concluded that the continuous and denseα-Al_(2)O_(3)on the surface of the bonding layer can effectively slow down the inflow of oxygen,reduce the growth rate of TGO,and inhibit the premature generation of mixed oxides;the internal oxidation rate of the bonding layer with a dense structure is slower,and the antioxidant property of the HVOF bonding layer is stronger than that of the bonding layer prepared by APS.The thickening of TGO and the generation of mixed oxides during thermal cycling are the main factors leading to the coating failure,and the better the antioxidant performance of the binder layer,the greater the thermal cycling life of the coating.

关 键 词：热障涂层 真空热处理 高温氧化 等离子喷涂 超音速火焰喷涂 

分 类 号：TG174.4[金属学及工艺—金属表面处理]