https://scholars.lib.ntu.edu.tw/handle/123456789/74253
標題: | Analysis of (Cr,Mo) Oxycarbide Films Grown on Stainless Steel via Metalloorganic Chemical Vapor Deposition | 作者: | Lo, Ming-Hung Wei, Wen-Cheng J. |
公開日期: | 1997 | 卷: | 80 | 期: | 4 | 起(迄)頁: | 886-892 | 來源出版物: | Journal of the American Ceramic Society | 摘要: | A mixture of hexacarbonyl of chromium and molybdenum ((Cr,Mo)(CO)6) was used to deposit oxycarbide films on stainless steel at temperatures of 175°-450°C. Through the analysis of deposition kinetics in various temperature regions, the controlling mechanism was determined to be exothermic surface reactions. Activation energies of the low- and medium-temperature regions were determined to be 71.2 and -60.1 kJ/mol, respectively. Some properties - including densities, composition, and crystalline phases - of the films were investigated. Results revealed that the chromium content of coating products increased as the temperature increased. The dominating surface reactions switched as temperature increased, because of the increase of chromium content in the precursor gas. Hence, the coating rate and density increased to a maximum, then decreased as the coating temperature was increased to >275°C. Deposited phases were determined by X-ray diffractometry, and the relationship with film density phases has been discussed, using their microstructural textures from scanning electron microscopy micrographs. Corrosion resistance was measured by an electrochemical method. The films obtained in the low- and medium-temperature regions improved the corrosion resistance of stainless-steel substrates by a factor of 24. In addition, the latter case showed the effect of passive protection and was an optimized selection for corrosive protection. The relationship of the improvement of corrosion resistance, physical properties, and the contribution of composed phases was discussed. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/95368 https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031117621&doi=10.1111%2fj.1151-2916.1997.tb02918.x&partnerID=40&md5=fe9af2535bdb83b3adb195ca2dd1a8e6 |
ISSN: | 00027820 | SDG/關鍵字: | Activation energy; Carbides; Corrosion resistance; Electrochemistry; Film growth; Metallorganic chemical vapor deposition; Protective coatings; Reaction kinetics; Scanning electron microscopy; Stainless steel; Thermal effects; X ray diffraction analysis; Chromium/molybdenum oxycarbide films; Exothermic surface reactions; Ceramic coatings |
顯示於: | 材料科學與工程學系 |
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