热扩散处理电弧离子镀铝涂层的结构及其抗氧化性能
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摘要
为了提高抗氢钢的抗高温氧化能力,采用电弧离子镀在抗氢钢上沉积Al涂层,通过高温热扩散处理,制备得铝基复合涂层。试验了不同温度对铝基复合涂层性能的影响,采用X射线光电子能谱仪(XPS)、X射线能谱仪(EDS)、X射线衍射仪(XRD)和扫描电镜(SEM)等分别测试了涂层的成分、晶体结构及表面、剖面形貌,通过高温氧化试验测试了涂层的抗高温氧化性能。结果表明:电弧离子镀Al涂层经热扩散处理后,剖面结构为分层分布,表层为Al2O3层,700℃处理后的厚度约0.7μm,为非晶态;950℃处理后的厚度约为2.2μm,为α相。内层为热扩散层,700℃形成成分含量不同的两层热扩散层,由FeNiAl5、FeAl3、Fe4Al13及Ni2Al3等多种富铝相组成;950℃形成热稳定相立方体的FeAl和NiAl相。
Aluminium coatings were deposited by arc ion plating on hydrogen resistance steel.Thermal diffusion treatment of Al coatings is used to improve the high-temperature oxidation resistance for hydrogen resistance steel.The influence of different thermal diffusion temperatures on performance of Al coatings was researched.The composition,structure and morphology of Al coatings were analyzed by X-ray photoelectric spectroscopy(XPS),energy dispersive spectrometer(EDS),X-ray diffraction(XRD)and scanning electron microscope(SEM).The high-temperature oxidation resistance performance was tested.The Al coatings treated by thermal diffusion is multi-layers.The thickness of the outer amorphous Al2O3 layer is about 0.7μm after thermal diffusing at 700℃for 4h,while the thickness of the outerα-phase Al2O3 layer is about 2.2μm after thermal diffusing at 950℃for 2h.The inner diffusion layer contains mainly Al,Fe,Ni and Cr,indicating that this is essentially an intermetallic zone.After thermal diffusing at 700℃for 4h,the double diffusion layers with different composition contents are formed and contains different Al-rich intermetallic phases,such as,FeNiAl5,FeAl3,Fe4Al13 and Ni2Al3.After thermal diffusion treatment at 950℃,the single diffusion layer with uniformity distribution of composition content is formed and contains FeAl and NiAl phases.
Aluminium coatings were deposited by arc ion plating on hydrogen resistance steel.Thermal diffusion treatment of Al coatings is used to improve the high-temperature oxidation resistance for hydrogen resistance steel.The influence of different thermal diffusion temperatures on performance of Al coatings was researched.The composition,structure and morphology of Al coatings were analyzed by X-ray photoelectric spectroscopy(XPS),energy dispersive spectrometer(EDS),X-ray diffraction(XRD)and scanning electron microscope(SEM).The high-temperature oxidation resistance performance was tested.The Al coatings treated by thermal diffusion is multi-layers.The thickness of the outer amorphous Al2O3 layer is about 0.7μm after thermal diffusing at 700℃for 4h,while the thickness of the outerα-phase Al2O3 layer is about 2.2μm after thermal diffusing at 950℃for 2h.The inner diffusion layer contains mainly Al,Fe,Ni and Cr,indicating that this is essentially an intermetallic zone.After thermal diffusing at 700℃for 4h,the double diffusion layers with different composition contents are formed and contains different Al-rich intermetallic phases,such as,FeNiAl5,FeAl3,Fe4Al13 and Ni2Al3.After thermal diffusion treatment at 950℃,the single diffusion layer with uniformity distribution of composition content is formed and contains FeAl and NiAl phases.
引文
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[12]罗新民,许勇,陈康敏.1Cr18Ni9Ti不锈钢渗铝层结构及其抗氧化性能[J].金属热处理,2008,33(12):42-45.
[2]Musil J,Blazek J,Zeman P,et al.Thermal stability of alumina thin films containingγ-Al2O3phase prepared by reactive magnetron sputteing[J].Applied Surface Science,2010,257(3):1058-62.
[3]汤梅,李弢,古宏伟,等.不锈钢基体上制备Al2O3涂层的研究[J].稀有金属,2008,32(5):593-597.
[4]Serra E,Glasbrenner E,Perujo A.Hot-dip aluminium deposit as a permeation barrier for MANET steel[J].Fusion Engineering and Design,1998,41(1/2/3/4):149-155.
[5]Han S L,Li H L,Wang S M,et al.Influence of silicon on hot-dip aluminizing process and subsequent oxidation for preparing hydrogen/tritium permeation barrier[J].International Journal of Hydrogen Energy,2010,35(7):2689-93.
[6]Kobayashi S,Yakou T.Control of intermetallic compound layers at interface between steel and aluminum by diffusiontreatment[J].Materials Science and Engineering A,2002,338(1/2):44-53.
[7]吴向清,田进,谢发勤,等.多弧离子镀铝对TiAl合金高温抗氧化性能的影响[J].中国表面工程,2009,22(5):50-55.
[8]银陈,陈长安,张鹏程.PECVD制备Al-Al2O3复合阻氢涂层的研究[J].表面技术,2008,37(3):41-44.
[9]Segda B G,Jacquet M,Besse J P.Elaboration,characterization and dielectric properties study of amorphous alumina thin films deposited by r.f.magnetron sputtering[J].Vacuum,2001,62(1):27-38.
[10]Song R G.Hydrogen permeation resistance of plasmasprayed Al2O3and Al2O3-13wt.%TiO2ceramic coatings on austenitic stainless steel[J].Surface&Coatings Technology,2003,168(2/3):191-194.
[11]蒋利,骆心怡,陶杰,等.316L不锈钢表面氧化铝梯度涂层的制备[J].机械工程材料,2008,32(12):40-43.
[12]罗新民,许勇,陈康敏.1Cr18Ni9Ti不锈钢渗铝层结构及其抗氧化性能[J].金属热处理,2008,33(12):42-45.