National Taiwan Ocean University Institutional Repository:Item 987654321/23452
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题名: Annealing and oxidation study of Mo–Ru hard coatings on tungsten carbide
作者: Yung-I Chen;Li-Chun Chang;Jyh-Wei Lee;Chih-Hsiung Lin
贡献者: NTOU:Institute of Materials Engineering
國立臺灣海洋大學:材料工程研究所
关键词: Annealing;Oxidation;Mo–Ru;XPS
日期: 2009-11-02
上传时间: 2011-10-20T08:06:17Z
出版者: Thin Solid Films
摘要: Abstract:As a protective hard coating on glass molding dies, Mo–Ru coatings were fabricated on binderless tungsten carbide substrates by RF magnetron sputtering. The Mo–Ru deposits were deposited at 550 °C, which revealed a columnar structure with a major axis perpendicular to the substrate. To evaluate the performance of hard coating in a realistic glass molding environment, the annealing effect was studied by heating the samples at 600 °C under the atmosphere constructed with a steady flow of nitrogen and controlled oxygen content of 12 ppm. The oxygen was absorbed into the Mo–Ru deposits, which affected the phase stability and mechanical properties. The Auger electron spectroscopy depth profiles certified the difference of oxidation resistance between Mo-rich and Ru-rich deposits. The X-ray photoelectron spectroscopy proved the valence variation of Mo in the near surface, accompanied by the introduction of oxygen ions. A scale of MoO3 and a Mo-depleted transition zone near the surface were pointed out by the transmission electron microscopy investigation on the Mo-rich deposit. On the other hand, the Ru-rich deposits absorbed oxygen in a less content and behaved higher hardness after annealing in the glass molding atmosphere, and became an appropriate protective coating for the die material.
關聯: 518(1), pp.194-200
URI: http://ntour.ntou.edu.tw/handle/987654321/23452
显示于类别:[材料工程研究所] 期刊論文

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