AC-HVAF和HVOF制备MCrAlY粘结层的组织结构及高温氧化性能
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摘要
热障涂层金属粘结层的制备工艺影响涂层的微观组织结构及性能。采用活性燃烧-超音速火焰喷涂(AC-HVAF)和传统超音速火焰喷涂(HVOF)2种工艺喷涂制备NiCoCrAlTaY粘结层,并对2种粘结层的组织结构及高温氧化性能进行对比。结果表明:AC-HVAF喷涂层表面半熔颗粒的尺寸为(13.242±1.392)μm,孔隙率为(1.34±0.18)%,氧含量为0.630%,表面粗糙度为(10.12±0.36)μm;HVOF喷涂层表面半熔颗粒的尺寸为(19.438±2.413)μm,孔隙率为(5.96±2.11)%,氧含量为2.300%,表面粗糙度为(11.35±0.43)μm;AC-HVAF制备的NiCoCrAlTaY金属粘结层高温氧化后表面生成了以α-Al2O3为主的热生长氧化物(TGO),而HVOF制备的NiCoCrAlTaY金属粘结层高温氧化后表面生成了以Cr-Ni复合氧化物为主的TGO,AC-HVAF制备的金属粘结层具有更优异的抗氧化性能。
NiCoCrAlTaY bonding coatings were prepared by sprayed active combustion high velocity air fuel( AC-HVAF) and conventional high velocity oxygen fuel( HVOF) processes,and the structures and high temperature oxidation resistance of two kinds of coatings were investigated and compared. Results showed that the AC-HVAF spraying coating exhibited the semi-molten particles with size of( 13. 242 ± 1. 392) μm,the porosity of( 1. 34 ± 0. 18) %,the oxygen content of 0. 630% and the surface roughness of( 10. 12 ± 0. 36) μm. While the HVOF spraying coating showed the semi-molten particles with size of( 19. 438 ± 2. 413) μm,the porosity of( 5. 96 ± 2. 11) %,the oxygen content of 2. 300%and the surface roughness of( 11. 35 ± 0. 43) μm. Besides,the thermal growth oxide( TGO) mainly composed of α-Al2O3 was formed on the surface of AC-HVAF spraying NiCoCrAlTaY bond coating,while TGO mainly composed of Cr-Ni composite oxides was formed on the surface of HVOF spraying NiCoCrAlTaY bond coating.
NiCoCrAlTaY bonding coatings were prepared by sprayed active combustion high velocity air fuel( AC-HVAF) and conventional high velocity oxygen fuel( HVOF) processes,and the structures and high temperature oxidation resistance of two kinds of coatings were investigated and compared. Results showed that the AC-HVAF spraying coating exhibited the semi-molten particles with size of( 13. 242 ± 1. 392) μm,the porosity of( 1. 34 ± 0. 18) %,the oxygen content of 0. 630% and the surface roughness of( 10. 12 ± 0. 36) μm. While the HVOF spraying coating showed the semi-molten particles with size of( 19. 438 ± 2. 413) μm,the porosity of( 5. 96 ± 2. 11) %,the oxygen content of 2. 300%and the surface roughness of( 11. 35 ± 0. 43) μm. Besides,the thermal growth oxide( TGO) mainly composed of α-Al2O3 was formed on the surface of AC-HVAF spraying NiCoCrAlTaY bond coating,while TGO mainly composed of Cr-Ni composite oxides was formed on the surface of HVOF spraying NiCoCrAlTaY bond coating.
引文
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[18]陈慧君,李其连,程旭东,等.TGO对热障涂层失效的作用分析[J].材料保护,2012,45(3):5~7.
[2]胡传顺,王福会,吴维.热障涂层的破坏方式及影响因素[J].石油化工高等学校学报,1999,12(4):77~80.
[3]管恒荣,李美姮,孙晓峰,等.高温合金热障涂层的氧化和失效研究[J].金属学报,2002,38(11):1 133~1 140.
[4]Chen W R,Wu X,Dudzinsky D.Influence of thermal cycle frequency on TGO growth and cracking behaviors of an APSTBC[J].Journal of Thermal Spray Technology,2012,21(6):1 294~1 299.
[5]Dong H,Yang G J,Li C X,et al.Effect of TGO thickness on thermal cyclic lifetime and failure mode of plasmasprayed TBCs[J].Journal of the American Ceramic Society,2014,97(4):1 226~1 232.
[6]Bharat K P,Vivek A,Mann B S.Development of low-oxide MCr Al Y coatings for gas turbine applications[J].Journal ofThermal Spray Technology,2007,16(2):275~280.
[7]Waki H,Kitamura T,Kobayashi A.Effect of thermal treatment on high-temperature mechanical properties enhancement in LPPS,HVOF,and APS Co Ni Cr Al Y coatings[J].Journal of Thermal Spray Technology,2009,18(4):500~509.
[8]Lima C R C,Guileman J M.Adhesion improvements of thermal barrier coatings with HVOF thermally sprayed bond coats[J].Surface and Coatings Technology,2007,201:4 694~4 701.
[9]Zhang G,Kanta A F,Li W Y,et al.Characterizations of AMT-200 HVOF Ni Cr Al Y coatings[J].Materials and Design,2009,30:622~627.
[10]Yuan F H,Chen Z X,Huang Z W,et al.Oxidation behavior of thermal barrier coatings with HVOF and detonationsprayed Ni Cr Al Y bond coats[J].Corrosion Science,2008,50:1 608~1 617.
[11]Toma D,Brandl W,Kster U.The characteristics of alumina scales formed on HVOF-sprayed MCr Al Y coatings[J].Oxidation of Metals,2000,53:125~137.
[12]王勇,崔占仓.AC-HVAF喷涂工艺在电站设备中的应用探讨[J].热喷涂技术,2011,3(1):44~47.
[13]王伟,王炎,向旭东,等.不同方法制备的TBC涂层特性的研究[J].东方汽轮机,2011(3):66~74.
[14]邓春明,邓畅光,况敏,等.等压等离子和超音速火焰喷涂Ni Co Cr Al YTa层的结构和性能[J].材料保护,2011,44(1):52~54.
[15]Tang F,Schoenung J M.Local accumulation of thermally grown oxide in plasma-sprayed thermal barrier coatings with rough top-coat/bond-coat interfaces[J].Scripta Materialia,2005,52:905~909.
[16]Gil A,Shemet V,Vassen R S M,et al.Effect of surface condition on the oxidation behavior of MCr Al Y coatings[J].Surface and Coatings Technology,2006,201:3 824~3 828.
[17]Zhang D B,Gong S K,Xu H B,et al.Effect of bond coat surface roughness on the thermal cyclic behavior of thermal barrier coatings[J].Surface and Coatings Technology,2006,201:649~653.
[18]陈慧君,李其连,程旭东,等.TGO对热障涂层失效的作用分析[J].材料保护,2012,45(3):5~7.