利用冷喷涂技术制备CoNiCrAIY涂层,并对涂层进行真空预氧化处理.结合X射线衍射,扫描电镜,能谱分析和透射电镜等方法分析了CoNiCrAlY涂层真空预氧化前后的微观组织结构,并研究了喷涂态涂层和真空预氧化涂层在900℃的75％ Na2 SO4+ 25％ NaCl(质量分数,下同)熔盐中的热腐蚀行为和机理.结果表明:冷喷涂CoNiCrAlY涂层呈纳米晶结构,含氧量为0.12％,孔隙率小于0.28％(体积分数).真空预氧化处理改善了涂层粒子间的结合,使涂层更加致密,并在涂层表面生成厚约0.26μm连续、致密的α-Al2O3氧化膜；喷涂态涂层和真空预氧化涂层在热腐蚀150h后表面均生成了以α-Al2O3为主的致密连续氧化膜,保护了基体免受腐蚀破坏；真空预氧化处理有效减缓了S和Cl等元素向涂层内扩散的速率,使涂层的抗腐蚀性能提高了近一倍.
参考文献
| [1] | Rabiei A.;Evans A.G. .FAILURE MECHANISMS ASSOCIATED WITH THE THERMALLY GROWN OXIDE IN PLASMA-SPRAYED THERMAL BARRIER COATINGS[J].Acta materialia,2000(15):3963-3976. |
| [2] | Nitin P. Padture;Maurice Gell;Eric H. Jordan .Thermal Barrier Coatings for Gas-Turbine Engine Applications[J].Science,2002(5566):280-284. |
| [3] | J.R. Nicholls .Advances in Coating Design for High-Performance Gas Turbines[J].MRS bulletin,2003(9):659-670. |
| [4] | Hamid Assadi;Frank Gartner;Thorsten Stoltenhoff .Bonding mechanism in cold gas spraying[J].Acta materialia,2003(15):4379-4394. |
| [5] | Richer, P.;Yandouzi, M.;Beauvais, L.;Jodoin, B. .Oxidation behaviour of CoNiCrAlY bond coats produced by plasma, HVOF and cold gas dynamic spraying[J].Surface & Coatings Technology,2010(24):3962-3974. |
| [6] | CHEN W R;IRISSOU E;WU X et al.The oxidation behavior of TBC with cold spray CoNiCrA1Y bond coat[J].Journal of ThermalSprayTechnology,2011,20(1 2):132-138. |
| [7] | ZHANG Q;LI C J;LI C X et al.Study of oxidation behaveior of nanostructured NiCrAlY bond coatings deposited by cold spraying[J].Surface and Coatings Technology,2008,202(14):33783384. |
| [8] | STEENKISTE T H V;SMITH J R;TEETS R E .Aluminum coating via kinetic spray with relatively large powder particles[J].Surface and Coatings Technology,2002,154(2-3):237252. |
| [9] | GOEBE J A;PETTIT F S .Na2SO4-induced accelerated oxidation(hot corrosion)of nickel[J].Metallurgical and Materials Transactions,1970,1(07):1943-1954. |
| [10] | ROBERT A RAPP .Hot corrosion of materials:a fluxing mecha nism[J].Corrosion Science,2002,44(02):209221. |
| [11] | S.M. Jiang;X. Peng;Z.B. Bao;S.C. Liu;Q.M. Wang;J. Gong;C. Sun;Bao;S;C;Liu;Q;M;Wang;J;Gong;C;Sun .Preparation And Hot Corrosion Behaviour Of A Mcraly + Alsiy Composite Coating[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2008(11):3213-3220. |
| [12] | HIRAMATSU N;UEMATSU Y;TANAKA T et al.Effect of al loy elements on NaCl-induced hot corrosion of stainless steels[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1989,120-121:319-329. |
| [13] | 梁英教;车英昌.无机物热力学数据手册[M].沈阳:东北大学出版社,1993 |
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