热障涂层双层黏结层的高温氧化行为
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摘要
采用箱式电阻炉研究了具有梯度热膨胀系数的(孔隙层+氧化层)双层黏结层结构热障涂层的高温氧化行为。采用气罩等离子喷涂在Inconel 738合金基材上制备60μm厚的孔隙层,通过超音速火焰喷涂(HVOF)在孔隙层上制备120μm厚的氧化层。在1000℃下对黏结层进行不同时间的高温氧化试验。结果表明,黏结层由孔隙层和氧化层组成;喷涂态孔隙层具有典型的层状结构,未出现明显氧化;喷涂态氧化层较为致密,内部弥散分布着细小的α-Al_2O_3颗粒;具有梯度热膨胀系数黏结层表面的热生长氧化物(TGO)生长速率显著低于传统黏结层,且不再遵循抛物线生长规律,而是以对数规律生长;由于生长速率缓慢,尽管在制备过程中消耗了部分Al元素,但在500 h范围内TGO仍然以α-Al_2O_3为主。
High temperature oxidation behavior of( porosity layer + oxidation layer) double-layered bonding thermal barrier coat with gradient thermal expansion coefficient was studied in a box-type resistance furnace. The shrouded plasma spraying was employed to deposit a 60 μm thickness of porosity layer on Inconel 738 superalloy substrate,then an oxidation layer with thickness of 120 μm was sprayed on porosity layer via high-velocity oxygen fuel spraying( HVOF). The high temperature oxidation behavior of the double-layer bond coat was studied based on the different time at 1000 ℃. The results show that the as-sprayed porosity layer has a typical lamellar structure and no obvious oxidation. The as-sprayed oxidation layer contains some dispersive distributed α-Al_2O_3. The growth rate of thermally grown oxide( TGO) on bond coat with gradient thermal expansion coefficient is dramatically lower than that of traditional bond coat. The growth of TGO obeys logarithm law instead of parabola law. In spite of depletion of a fraction of Al element during deposition,the TGO is still dominated byα-Al_2O_3 within the range of 500 h due to the lower growth rate.
High temperature oxidation behavior of( porosity layer + oxidation layer) double-layered bonding thermal barrier coat with gradient thermal expansion coefficient was studied in a box-type resistance furnace. The shrouded plasma spraying was employed to deposit a 60 μm thickness of porosity layer on Inconel 738 superalloy substrate,then an oxidation layer with thickness of 120 μm was sprayed on porosity layer via high-velocity oxygen fuel spraying( HVOF). The high temperature oxidation behavior of the double-layer bond coat was studied based on the different time at 1000 ℃. The results show that the as-sprayed porosity layer has a typical lamellar structure and no obvious oxidation. The as-sprayed oxidation layer contains some dispersive distributed α-Al_2O_3. The growth rate of thermally grown oxide( TGO) on bond coat with gradient thermal expansion coefficient is dramatically lower than that of traditional bond coat. The growth of TGO obeys logarithm law instead of parabola law. In spite of depletion of a fraction of Al element during deposition,the TGO is still dominated byα-Al_2O_3 within the range of 500 h due to the lower growth rate.
引文
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[3]Dong H,Yang GJ,Li C X,et al.Effect of TGO thickness on thermal cyclic lifetime and failure mode of plasma-sprayed TBCs[J].Journal of the American Ceramic Society,2014,97(4):1226-1232.
[4]Zhang B Y,Meng G H,Yang G J,et al.Dependence of scale thickness on the breaking behavior of the initial oxide on plasma spray bond coat surface during vacuum pre-treatment[J].Applied Surface Science,2017,397:125-132.
[5]Meng G H,Zhang B Y,Liu H,et al.Highly oxidation resistant and cost effective MCrAlY bond coats prepared by controlled atmosphere heat treatment[J].Surface and Coatings Technology,2018,347:54-65.
[6]陈焕涛,张小锋,周克崧,等.温度梯度热循环下纳米7YSZ陶瓷层结构演变[J].表面技术,2017,46(6):256-262.Chen Huantao,Zhang Xiaofeng,Zhou Kesong,et al.Structure evolution of nano-7YSZ ceramic coating during gradient thermal cycle[J].Surface Technology,2017,46(6):256-262.
[7]Dong H,Yao J T,Li X,et al.The sintering behavior of plasmasprayed YSZ coating over the delamination crack in low temperature environment[J].Ceramics International,2018,44(3):3326-3332.
[8]Dong H,Yang G J,Li C J,et al.The influence of temperature gradient across YSZ on thermal cyclic lifetime of plasma-sprayed thermal barrier coatings[J].Ceramics International,2018,41(9):11046-11056.
[9]张新格,邓畅光,邓春明,等.不同工艺制备的Ni-Cr-Al-Y合金涂层及性能[J].金属热处理,2015,40(8):79-83.Zhang Xinge,Deng Changguang,Deng Chunming,et al.Ni-Cr-Al-Yalloy coatings prepared by different technologies and their properties[J].Heat Treatment of Metals,2015,40(8):79-83.
[10]车畅,吴国清,齐红宇,等.等离子热障涂层不同温度的氧化行为研究[J].金属热处理,2009,34(1):60-63.Che Chang,Wu Guoqing,Qi Hongyu,et al.Oxidation behavior of plasma sprayed thermal barrier coatings at different temperatures[J].Heat Treatment of Metals,2009,34(1):60-63.
[11]邝子奇,陈文龙,刘敏,等.粘结层预处理对PS-PVD沉积7YSZ热障涂层氧化行为的影响[J].表面技术,2017,46(3):84-90.Kuang Ziqi,Chen Wenlong,Liu Min,et al.Effect of bond coats pretreatment on oxidation behavior of 7YSZ thermal barrier coating deposited by plasma spray-physical vapor deposition[J].Surface Technology,2017,46(3):84-90.
[12]Li C J,Li Y,Yang G J,et al.A novel plasma-sprayed durable thermal barrier coating with a well-bonded YSZ interlayer between porous YSZ and bond coat[J].Journal of Thermal Spray Technology,2012,21(3/4):383-390.
[13]Jiang J,Zou Z,Wang W,et al.Effect of internal oxidation on the interfacial morphology and residual stress in air plasma sprayed thermal barrier coatings[J].Surface and Coatings Technology,2018,334:215-226.
[14]Chen W R,Wu X,Marple B R,et al.TGO growth behavior in TBCs with APS and HVOF bond coats[J].Surface and Coatings Technology,2008,202(12):2677-2683.
[15]董会,杨冠军,雒晓涛,等.混合氧化物对等离子喷涂热障涂层热循环寿命的影响[J].中国表面工程,2015,28(1):21-28.Dong Hui,Yang Guanjun,Luo Xiaotao,et al.Effects of mixed oxides on thermal cyclic lifetime of plasma-sprayed thermal barrier coatings[J].China Surface Engineering,2015,28(1):21-28.
[16]范晋楷,李晓泉,张保森,等.热喷涂热障涂层的热生长氧化层的生长和演变[J].金属热处理,2018,43(2):86-90.Fan Jinkai,Li Xiaoquan,Zhang Baosen,et al.Growth and evolution of thermally grown oxides in thermal barrier coating produced by thermal spraying[J].Heat Treatment of Metals,2018,43(2):86-90.
[17]李运初,毛杰,邓子谦,等.低温超音速火焰喷涂MCrAlY涂层的高温氧化[J].金属热处理,2017,42(6):51-55.Li Yunchu,Mao Jie,Deng Ziqian,et al.High temperature oxidation of MCrAlY coating prepared by low temperature high velocity oxygenfuel spraying[J].Heat Treatment of Metals,2017,42(6):51-55.
[18]曾晓雁,吴懿平.表面工程学[M].2版.北京:机械工业出版社,2018:26.Zeng Xiaoyan,Wu Yiping.Surface Engineering[M].Second Edition.Beijing:Mechanical Industry Press,2018:26.