Ni-CeO_2复合镀层厚度对δ-Ni_2Al_3-CeO_2/Ni-CeO_2涂层体系扩散行为的影响
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摘要
在Ni基体电沉积不同厚度的Ni-CeO_2复合镀层并对其进行620°C低温渗铝,制备了剩余复合镀层厚度分别约为10和45μm厚的δ-Ni_2Al_3-CeO_2/Ni-CeO_2涂层体系。1000°C真空退火5 h后,以上两种涂层体系均可在铝化物/镀层界面形成CeO_2富集层。但剩余复合镀层厚度为10μm的涂层体系由于氧化物富集程度不足,涂层退化程度较剩余复合镀层厚度为45μm的涂层体系严重。可见,在镀层氧化物颗粒含量一定的情况下,渗铝后剩余镀层厚度是影响扩散障有效性的重要因素。
Ni-CeO_2 composite films with different thicknesses were electrodeposited on Ni substrate and then aluminized at 620 ℃. Accordingly, two coating(δ-Ni_2Al_3-CeO_2/Ni-CeO_2) systems consisted of an outer portion of δ-Ni_2Al_3-CeO_2 and an inner portion of remaining Ni-CeO_2 films of ca 10 and 45 μm respectively in thickness were prepared. After vacuum annealing at 1000 ℃ for 5 h, the above two coating systems all formed a CeO_2-rich layer in between the outer aluminide coating and the inner Ni-CeO_2 film. However, the degradation of the coating system with the inner Ni-CeO_2 film of 10 μm was more serious than that of 45 μm due to the insufficient oxides enrichment at the interface of aluminide/Ni-CeO_2. It can be seen that the thickness of the remaining inner Ni-CeO_2 film after aluminizing is an important factor responsible to the effectiveness of diffusion barrier for the prepared Ni-CeO_2 film containing a designed amount of CeO_2 particles.
Ni-CeO_2 composite films with different thicknesses were electrodeposited on Ni substrate and then aluminized at 620 ℃. Accordingly, two coating(δ-Ni_2Al_3-CeO_2/Ni-CeO_2) systems consisted of an outer portion of δ-Ni_2Al_3-CeO_2 and an inner portion of remaining Ni-CeO_2 films of ca 10 and 45 μm respectively in thickness were prepared. After vacuum annealing at 1000 ℃ for 5 h, the above two coating systems all formed a CeO_2-rich layer in between the outer aluminide coating and the inner Ni-CeO_2 film. However, the degradation of the coating system with the inner Ni-CeO_2 film of 10 μm was more serious than that of 45 μm due to the insufficient oxides enrichment at the interface of aluminide/Ni-CeO_2. It can be seen that the thickness of the remaining inner Ni-CeO_2 film after aluminizing is an important factor responsible to the effectiveness of diffusion barrier for the prepared Ni-CeO_2 film containing a designed amount of CeO_2 particles.
引文
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[2]Song T,Tan X X,Tan Z J,et al.High temperature protective coatings with reactive element[J].Surf.Technol.,2017,46(8):201(宋涛,谭晓晓,谭志俊等.活性元素改性高温防护涂层的研究现状[J].表面技术,2017,46(8):201)
[3]Tan X,Peng X,Wang F.The effect of grain refinement on the adhesion of an alumina scale on an aluminide coating[J].Corros.Sci.,2014,85:280
[4]Hou P Y,Tolpygo V K.Examination of the platinum effect on the oxidation behavior of nickel-aluminide coatings[J].Surf.Coat.Technol.,2007,202:623
[5]Tan X X,Ma L Y.Research progress of the high temperature oxidation resistance of oxide dispersion strengthened superalloys[J].Mater.Rev.,2017,31(11):121(谭晓晓,马利影.氧化物弥散强化高温合金抗氧化性能的研究进展[J].材料导报,2017,31(11):121)
[6]Wang X,Peng X,Tan X,et al.The reactive element effect of ceria particle dispersion on alumina growth:A model based on microstructural observations[J].Sci.Rep.,2016,6:29593
[7]Narita T.Diffusion barrier coating system concept for high temperature applications[J].Can.Metall.Q.,2011,50:278
[8]Narita T,Thosin K Z,Fengqun L,et al.Development of Re-based diffusion barrier coatings on nickel based superalloys[J].Mater.Corros.,2005,56:923
[9]Cavaletti E,Naveos S,Mercier S,et al.Ni-W diffusion barrier:its influence on the oxidation behaviour of aβ-(Ni,Pt)Al coated fourth generation nickel-base superalloy[J].Surf.Coat.Technol.,2009,204:761
[10]Haynes J A,Zhang Y,Cooley K M,et al.High-temperature diffusion barriers for protective coatings[J].Surf.Coat.Technol.,2004,188/189:153
[11]Li W Z,Wang Q M,Sun C.Development of diffusion barrier in high temperature coating systems[J].Mater.Rev.,2009,23(5):30(李伟洲,王启民,孙超.高温防护涂层扩散阻挡层的研究进展[J].材料导报,2009,23(5):30)
[12]Al Jabbari Y S,Fehrman J,Barnes A C,et al.Titanium nitride and nitrogen ion implanted coated dental materials[J].Coatings,2012,2:160
[13]Wang Q M,Wu Y N,Guo M H,et al.Ion-plated Al-O-N and CrO-N films on Ni-base superalloys as diffusion barriers[J].Surf.Coat.Technol.,2005,197:68
[14]Li H Q,Wang Q M,Jiang S M,et al.Ion-plated Al-Al2O3films as diffusion barriers between NiCrAlY coating and orthorhombicTi2AlNb alloy[J].Corros.Sci.,2010,52:1668
[15]Müller J,Neuschütz D.Efficiency ofα-alumina as diffusion barrier between bond coat and bulk material of gas turbine blades[J].Vacuum,2003,71:247
[16]Tan X,Peng X,Wang F.The mechanism for self-formation of a CeO2diffusion barrier layer in an aluminide coating at high temperature[J].Surf.Coat.Technol.,2013,224:62
[17]Xu C,Peng X,Wang F.Cyclic oxidation of an ultrafine-grained and CeO2-dispersedδ-Ni2Al3coating[J].Corros.Sci.,2010,52:740
[18]Tan X X,Peng X.Aδ-Ni2Al3-Cr2O3/Ni-Cr2O3coating system with ability of self-formation of a diffusion barrier of Al2O3at high temperature[J].Corros.Sci.Prot.Technol.,2015,27:49(谭晓晓,彭晓.一种可内生Al2O3扩散障的δ-Ni2Al3-Cr2O3/NiCr2O3涂层体系[J].腐蚀科学与防护技术,2015,27:49)
[19]Paul A,Kodentsov A A,van Loo F J J.On diffusion in theβ-NiAl phase[J].J.Alloy.Compd.,2005,403:147
[20]Shankar S,Seigle L.Interdiffusion and intrinsic diffusion in the NiAl(δ)phase of the Al-Ni system[J].Metall.Mater.Trans.,1978,9A:1467