包埋工艺对钼表面Si-B-Y复合涂层氧化行为的影响
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摘要
在纯钼基体表面分别采用共渗包埋法和两步包埋法两种工艺制备了Si-B-Y复合涂层。采用XRD和SEM分析了两种包埋工艺制备的Si-B-Y复合涂层的物相组成及截面形貌;评价了涂层在1150℃大气环境下的循环抗氧化性能。结果表明:两种包埋工艺制备的Si-B-Y复合涂层与基体结合紧密,且两步包埋工艺制备的涂层更加致密;经1150℃循环氧化275 h后,两步包埋法制备的涂层孔洞层厚约10μm,仅为共渗涂层孔洞层厚的1/5,具有良好的抗热震性能;两种复合涂层在1150℃循环氧化前105 h过程中均遵循抛物线氧化规律,其中两步包埋法制备的Si-B-Y复合涂层的氧化速率常数为1.20×10~(-4)mg~2/(cm~4·h),较共渗包埋涂层(5.60×10~(-4)mg~2/(cm~4·h))低近78%,这说明两步包埋法所得Si-B-Y复合涂层的高温抗氧化性能较共渗包埋法的优异。
Si-B-Y composite coatings were prepared by co-infiltration embedding process and two-step embedding process on the surface of pure molybdenum substrate. SEM, EDS and XRD were used to analyze the phase composition and cross-section structure of different Si-B-Y composite coatings. The high temperature oxidation resistance was evaluated at 1150 ℃ in atmospheric environment. The results show that Si-B-Y composite coatings prepared by different embedding processes are tightly bonded with the Mo substrate. Moreover, the coating prepared by two-step embedding process is denser than that of co-infiltration process. After oxidation at 1150 ℃ for 275 h, the thickness of the porous layer in the coating prepared by the two-step embedding process is about 10 μm, which is only 1/5 of the porous layer in the coating prepared by the co-infiltration embedding process and has good thermal shock resistance. Both the composite coatings follow the parabolic oxidation pattern during a cycle of 105 h at 1150 ℃. The oxidation rate Kpof Si-B-Y composite coating prepared by the two-step embedding process determined over 105 h at 1150° C is found to be 1.20×10~(-4)mg~2/(cm~4·h), which is nearly 78%lower than that of co-infiltration embedding coating(5.60×10~(-4)mg~2/(cm~4·h)). The Si-B-Y composite coating prepared by two-step embedding process shows more excellent high-temperature oxidation resistance than that of co-infiltration process.
Si-B-Y composite coatings were prepared by co-infiltration embedding process and two-step embedding process on the surface of pure molybdenum substrate. SEM, EDS and XRD were used to analyze the phase composition and cross-section structure of different Si-B-Y composite coatings. The high temperature oxidation resistance was evaluated at 1150 ℃ in atmospheric environment. The results show that Si-B-Y composite coatings prepared by different embedding processes are tightly bonded with the Mo substrate. Moreover, the coating prepared by two-step embedding process is denser than that of co-infiltration process. After oxidation at 1150 ℃ for 275 h, the thickness of the porous layer in the coating prepared by the two-step embedding process is about 10 μm, which is only 1/5 of the porous layer in the coating prepared by the co-infiltration embedding process and has good thermal shock resistance. Both the composite coatings follow the parabolic oxidation pattern during a cycle of 105 h at 1150 ℃. The oxidation rate Kpof Si-B-Y composite coating prepared by the two-step embedding process determined over 105 h at 1150° C is found to be 1.20×10~(-4)mg~2/(cm~4·h), which is nearly 78%lower than that of co-infiltration embedding coating(5.60×10~(-4)mg~2/(cm~4·h)). The Si-B-Y composite coating prepared by two-step embedding process shows more excellent high-temperature oxidation resistance than that of co-infiltration process.
引文
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[3]白晓东,岳坤,周小军.钽及钽合金高温抗氧化涂层研究进展[J].企业技术开发,2017,36(1):39-41.
[4]张勇,王雄禹,于静,等.高温应用钼及钼合金表面改性研究进展[J].材料导报,2017,31(7):83-87.
[5]Uzunonat Y,Uzgur S C,Diltemiz S F,et al.Mo Si2composites for high temperature structural applications[J].Advanced Materials Research,2011:103-107.
[6]Yang Y,Chang Y A.Thermodynamic modeling of the Mo-Si-B system[J].Intermetallics,2005,13(2):121-128.
[7]Zhang P,Guo X,Zhang C,et al.Deposition and oxidation behavior of Mo(Si,Al)2/MoB layered coatings on TZM alloy[J].International Journal of Refractory Metals&Hard Materials,2017,67:32-39.
[8]Perepezko J H,Sakidja R.Oxidation-resistant coatings for ultra-high-temperature refractory Mo-based alloys[J].JOM,2010,62(10):13-19.
[9]Dai L,Yu Y,Zhou H,et al.In-situ synthesis of MoSi2,coating on molybdenum substrate by electro-deoxidation of a SiO2,layer in molten salt[J].Ceramics International,2015,41(10):13663-13670.
[10]Wang Y,Yan J,Wang D,et al.High temperature oxidation and microstructure of Mo Si2/MoB composite coating for Mo substrate[J].International Journal of Refractory Metals&Hard Materials,2017:60-64.
[11]Kuznetsov S A,Rebrov E V,Mies M J M,et al.Synthesis of protective Mo-Si-B coatings in molten salts and their oxidation behavior in an air-water mixture[J].Surface&Coatings Technology,2006,201(3/4):971-978.
[12]Lange A,Heilmaier M,Sossamann T A,et al.Oxidation behavior of pack-cemented Si-B oxidation protection coatings for Mo-Si-B alloys at 1300℃[J].Surface&Coatings Technology,2015,266:57-63.
[13]Tian X,Guo X,Sun Z,et al.Effects of Y2O3/Y on Si-Bco-deposition coating prepared through HAPC method on pure molybdenum[J].稀土学报(英文版),2016,34(9):952-957.
[14]Chakraborty S P,Banerjee S,Sharma I G,et al.Development of silicide coating over molybdenum based refractory alloy and its characterization[J].Journal of Nuclear Materials,2010,403(1):152-159.
[15]田晓东,郭喜平,尹忠奇,等.纯钼表面包埋Si-B共渗涂层的显微组织及低温氧化行为[J].材料热处理学报,2014,35(8):171-175.
[16]王刚.抗低温氧化型二硅化钼基复合材料研究[D].上海:中国科学院上海硅酸盐研究所,2004.
[17]Yoon J K,Kim G H,Byun J Y,et al.Simultaneous growth mechanism of intermediate silicides in Mo Si2/Mo system[J].Surface&Coatings Technology,2001,148(2/3):129-135.