Mo-Si-B合金表面包埋渗Si-Al涂层的组织及氧化膜结构研究
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摘要
采用包埋渗Si-Al的方法在Mo-9Si-8B(at%)合金表面制备抗氧化涂层,然后在1250℃下进行5 h氧化;同时制备包埋渗Si和Si-B涂层以进行对比。运用扫描电镜(SEM)和能谱仪(EDS)分析该涂层的组织和结构,利用X射线衍射仪(XRD)确定涂层的相组成,采用波谱仪(WDS)分析涂层中的B元素。结果表明:包埋渗Si和Si-B涂层都主要由MoSi_2外层和MoB内层组成,但Si-B共渗涂层内层更厚;Si-Al共渗在基体表面形成Al改性MoSi_2涂层,由Mo(Si,Al)_2外层和MoB内层组成。对三种涂层在1250℃下氧化5 h,前两种涂层表面氧化膜主要由SiO_2和Mo_8O_(23)组成,而Si-Al共渗涂层表面氧化膜主要由SiO_2、Al_2SiO_5和Mo_8O_(23)组成。
The anti-oxidation coating was prepared on the surface of Mo-9Si-8B(at%) alloy by pack cementation Si-Al and then oxidation at 1250 ℃ for 5 h, and Si and Si-B coatings were prepared for comparison at the same time. The scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) were used to analyze the microstructure and structure of the coating, and X-ray diffractometer(XRD) was used to determine the constituent phase of the coating. B element in the coatings was determined by wave dispersive spectroscopy(WDS). The results show that Si deposition coating and Si-B co-deposition coating consist of MoSi_2 outer layer and MoB inner layer, but the Si-B co-deposition coating has thicker inner layer; it forms Al-modified MoSi_2 coating on the surface of the substrate by Si-Al co-deposition, which consists of Mo(Si,Al)_2 outer layer and MoB inner layer. These three coatings are oxidized at 1250 ℃ for 5 h, the oxidation film on the first two coatings is mainly composed of SiO_2 and Mo_8O_(23), while the oxidation film on the Si-Al co-deposition coating is mainly composed of SiO_2, Al_2SiO_5 and Mo_8O_(23).
The anti-oxidation coating was prepared on the surface of Mo-9Si-8B(at%) alloy by pack cementation Si-Al and then oxidation at 1250 ℃ for 5 h, and Si and Si-B coatings were prepared for comparison at the same time. The scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) were used to analyze the microstructure and structure of the coating, and X-ray diffractometer(XRD) was used to determine the constituent phase of the coating. B element in the coatings was determined by wave dispersive spectroscopy(WDS). The results show that Si deposition coating and Si-B co-deposition coating consist of MoSi_2 outer layer and MoB inner layer, but the Si-B co-deposition coating has thicker inner layer; it forms Al-modified MoSi_2 coating on the surface of the substrate by Si-Al co-deposition, which consists of Mo(Si,Al)_2 outer layer and MoB inner layer. These three coatings are oxidized at 1250 ℃ for 5 h, the oxidation film on the first two coatings is mainly composed of SiO_2 and Mo_8O_(23), while the oxidation film on the Si-Al co-deposition coating is mainly composed of SiO_2, Al_2SiO_5 and Mo_8O_(23).
引文
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[4] Krüger M, Franz S, Saage H, et al.Mechanically alloyedMo-Si-B alloys with a continuousα-Mo matrix and improvedmechanical properties[J].Intermetallics,2008,16(7):933-941.
[5] Lemberg J A, Ritchie R O.Mo-Si-B alloys for ultrahigh-tem-perature structural applications[J].Advanced Materials,2012,24(26):3445-3480.
[6] Heilmaier M, Krüger M, Saage H, et al.Metallic materialsfor structural applications beyond nickel-based superalloys[J].JOM,2009,61(7):61-67.
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[8] Burk S, Gorr B, Krüger M, et al.Oxidation behavior ofMo-Si-B-(X)alloys:Macro-and microalloying(X=Cr,Zr,La2O3)[J].JOM,2011,63(12):32-36.
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[11] Maruyama T, Yanagihara K.High temperature oxidation andpesting of Mo(Si, Al)2[J].Materials Science&Engineering A,1998,239-240(1):828-841.
[12] Jackson J E, Olson D L, Mishra B, et al.Deposition andcharacterization of Al-Si metallic TBC precursor on Mo-Si-Bturbine materials[J].International Journal of Hydrogen Energy,2007,32(16):3789-3796.
[13]张厚安,庞佑霞,李颂文,等.关于Mo Si2氧化相低温化学稳定性图的建立与分析[J].稀有金属,2000,24(6):423-426.
[14]李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001:73-74.
[15] Jedliński J, Borchardt G, Mrowec S.Transport properties ofalumina scales on theβ-NiAl intermetallic[J].Solid State Ionics,1992,50(1/2):67-74.