真空预氧化处理对热障涂层静态氧化行为的影响  

Effect of Vacuum Pre-oxidation Treatment on Oxidation Behavior of Thermal Barrier Coating

作　　者：杜仲[1] 王全胜[1] 柳彦博[1] 李云凯[1] 

机构地区：[1]北京理工大学材料学院,北京100081

出　　处：《航空材料学报》2015年第5期27-31,共5页Journal of Aeronautical Materials

摘　　要：利用超音速火焰喷涂技术在DZ40M合金表面制备了Ni Co Cr Al Y粘结层,采用等离子喷涂技术在粘结层表面制备了陶瓷面层,并对整体热障涂层进行了真空预氧化处理。通过高温静态氧化实验研究了真空预氧化对热障涂层的氧化行为的影响。结果表明:真空预处理可在MCr Al Y粘结层和陶瓷面层的界面处形成连续、致密的α-Al2O3层;在1050℃下氧化800h后,喷涂态涂层TGO中除α-Al2O3外,还生成了大量尖晶石氧化物,而预氧化涂层TGO则以α-Al2O3为主;预氧化处理有效抑制了涂层在高温氧化过程中尖晶石氧化物的形成,从而降低了整体氧化膜的生长速率。Ni Co Cr Al Y bond coating was prepared by high velocity oxy-fuel（ HVOF） spray and top coating was prepared by plasma spray. Pre-oxidation was conducted before the high temperature isothermal oxidation. Effect of vacuum pre-oxidation on the oxidation behavior of thermal barrier coatings was studied by high temperature static oxidation experiment. The results show that a dense and continuous α-Al2O3 film is formed after the pre-oxidation treatment. After oxidation for 800 h at 1050℃,a TGO,composed of α-Al2O3 and a large amout of spinel-type oxides,was formed in as-sprayed coating. On the contrary,a TGO,mainly composed of α-Al2O3,is formed in the coating after pre-oxidation treatment. Pre-oxidation treatment can postpone the formation of spinel oxide effectively and then slow down the growth rate of thermally grown oxide（ TGO）.

关 键 词：热障涂层 真空预处理 高温氧化 热生长氧化物 

分 类 号：TG174.422[金属学及工艺—金属表面处理]