Al基涂层和Ni-Cr基涂层抗蒸汽氧化性能研究
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摘要
对T91+Al基涂层和T91+Ni-Cr基涂层在600℃/27 MPa蒸汽参数下的氧化性能进行了研究,氧化1 300 h后,利用扫描电子显微镜(SEM)和能谱仪(EDS)分析了氧化膜表面及横截面形貌、微观组织结构和元素分布。结果表明:Al基涂层和Ni-Cr基涂层的抗蒸汽氧化性能显著优于T91钢试样,且Al基涂层的抗蒸汽氧化性能优于Ni-Cr基涂层;蒸汽氧化过程中Al基涂层表面形成了以Al的氧化物(Al氧化物为主,一定量的Si氧化物和Cr氧化物)为主的连续致密氧化膜;蒸汽氧化过程中Ni-Cr基涂层表面形成了富Ni和Cr的氧化膜。
The steam oxidation resistance of Al-based and Ni-Cr-based coatings over T91 base metal was investigated at 600 ℃/27 MPa for 1 300 h using scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS) to analyze the surface morphology, cross-section morphology, microstructure and chemical composition of the oxide films. Results show that the oxidation resistance of above coatings is significantly higher than T91 base metal, and that of Al-based coating is better than Ni-Cr-based one. In the process of steam oxidation, a continuous dense layer of aluminum rich oxides with a certain amount of chromium oxide and silicon oxide form on the surface of Al-based coating, while a(Ni,Cr)-rich oxide layer forms on the Ni-Cr-based coating.
The steam oxidation resistance of Al-based and Ni-Cr-based coatings over T91 base metal was investigated at 600 ℃/27 MPa for 1 300 h using scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS) to analyze the surface morphology, cross-section morphology, microstructure and chemical composition of the oxide films. Results show that the oxidation resistance of above coatings is significantly higher than T91 base metal, and that of Al-based coating is better than Ni-Cr-based one. In the process of steam oxidation, a continuous dense layer of aluminum rich oxides with a certain amount of chromium oxide and silicon oxide form on the surface of Al-based coating, while a(Ni,Cr)-rich oxide layer forms on the Ni-Cr-based coating.
引文
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[3] 马云海,郑开云.四种锅炉管材料650 ℃/26 MPa的蒸汽氧化研究[J].动力工程学报,2015,35(6):509-516.MA Yunhai,ZHENG Kaiyun.Study on steam oxidation of 4 boiler tube materials at 650 ℃/26 MPa[J].Journal of Chinese Society of Power Engineering,2015,35(6):509-516.
[4] VOGLEWEDE B,RANGEL V R,VARMA S K.The effects of uncommon silicides on the oxidation behavior of alloys from the Nb-Cr-Si system[J].Corrosion Science,2012,61:123-133.
[5] HONG Zhen,ZHANG Hu,WENG Junfei,et al.Oxidation behavior of Nb-24Ti-18Si-2Al-2Hf-4Cr and Nb-24Ti-18Si-2Al-2Hf-8Cr hypereutectic alloys at1 250 ℃[J].Rare Metals,2017,36(3):168-173.
[6] ESPARZA N,RANGEL V,GUTIERREZ A,et al.A comparison of the effect of Cr and Al additions on the oxidation behaviour of alloys from the Nb-Cr-Si system[J].Materials at High Temperatures,2016,33(2):105-114.
[7] SU Linfen,JIA Lina,JIANG Kaiyong,et al.The oxidation behavior of high Cr and Al containing Nb-Si-Ti-Hf-Al-Cr alloys at 1 200 and 1 250 ℃[J].International Journal of Refractory Metals and Hard Materials,2017,69:131-137.
[8] YAMAMOTO Y,BRADY M P,LU Z P,et al.Creep-resistant,Al2O3-forming austenitic stainless steels[J].Science,2007,316(5823):433-436.
[9] HOLCOMB G R.Calculation of reactive-evaporation rates of chromia[J].Oxidation of Metals,2008,69(3/4):163-180.
[10] VENKATRAMAN M,NEUMANN J P.The Cr-P (chromium-phosphorus) system[J].Journal of Phase Equilibria,1990,11(5):430-434.
[11] SUNDARARAJAN T,KURODA S,ITAGAKI T,et al.Steam oxidation resistance of Ni-Cr thermal spray coatings on 9Cr-1Mo steel.Part 1:80Ni-20Cr[J].ISIJ International,2003,43(1):95-103.
[12] SUNDARARAJAN T,KURODA S,ITAGAKI T,et al.Steam oxidation resistance of Ni-Cr thermal spray coatings on 9Cr-1Mo steel.Part 2:50Ni-50Cr[J].ISIJ International,2003,43(1):104-111.
[13] ZHANG Y,PENG X,WANG Fengyu.Development and oxidation at 800 ℃ of a novel electrodeposited Ni-Cr nanocomposite film[J].Materials Letters,2004,58(6):1134-1138.
[14] BALA N,SINGH H,PRAKASH S.High-temperature oxidation studies of cold-sprayed Ni-20Cr and Ni-50Cr coatings on SAE 213-T22 boiler steel[J].Applied Surface Science,2009,255(15):6862-6869.
[15] SUNDARARAJAN T,KURODA S,ABE F.Steam oxidation resistance of two-layered Ni-Cr and Al APS coating for USC boiler applications[J].Corrosion Science,2005,47(5):1129-1147.
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