Synthesis of molybdenum borides and molybdenum silicides in molten salts and their oxidation behavior in an air–water mixture
Synthesis of molybdenum borides and molybdenum silicides in molten salts and their oxidation behavior in an air–water mixture
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DOI：
10.1016/j.surfcoat.2004.05.021
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发表时间：
2005-05
影响因子：
5.4
通讯作者：
S. Kuznetsov;S. Kuznetsova;E. Rebrov;M.J.M. Mies;M. Croon;J. Schouten
中科院分区：
文献类型：
--
作者：
S. Kuznetsov;S. Kuznetsova;E. Rebrov;M.J.M. Mies;M. Croon;J. Schouten
研究了钼硼体系和钼硅体系中各种镀层的形成。在850 ~ 1050℃的惰性气体气氛下进行熔盐渗硼和硅化处理7 h， x射线衍射分析证实了Mo板表面存在硼化物（Mo2B、MoB、Mo2B5）和硅化物（MoSi2、Mo5Si3）相。利用表面的波长色散光谱（WDS）和从表面到内部的线扫描分析确定了元素的分布。根据工艺类型（扩散或电化学）和温度的不同，衬底上形成的保护层厚度在6 ~ 40 μm之间。在空气-水混合物中，在500-700°C的温度范围内，长达400 h的时间内，研究了所得相的抗氧化性。与纯钼相比，涂层板的氧化行为有所改善。
The formation of various coatings in molybdenum–boron and molybdenum–silicon systems was investigated. Boronizing and siliciding treatments were conducted in molten salts under inert gas atmosphere in the 850–1050 °C temperature range for 7 h. The presence of boride (e.g. Mo2B, MoB, Mo2B5) and silicide (MoSi2, Mo5Si3) phases, formed on the surface of Mo plates, was confirmed by X-ray diffraction analysis. The distribution of elements was determined by means of wavelength dispersive spectroscopy (WDS) spectra of the surface and line-scan analyses from surface to interior. Depending on the process type (diffusional or electrochemical) and temperature, the thickness of the protective layers formed on the substrate ranged from 6 to 40 μm. The oxidation resistance of obtained phases was investigated in an air–water mixture in the temperature range of 500–700 °C for a period up to 400 h. An improved oxidation behavior of coated plates in comparison with that of pure molybdenum was observed.