题目：Microstructure of Chromia Scales grown in CO₂

报告人：D.J. Young
　　　　　School of Materials Science & Engineering, University of New South Wales,
　　　　　Sydney, Australia

时间：10月23日（周四），15:00-16:30

地点：南区1楼报告厅

Microstructure of Chromia Scales grown in CO₂

D.J. Young

School of Materials Science & Engineering, University of New South Wales, Sydney, Australia

Scales grown on chromia-forming alloys in CO₂ are less protective than those developed during exposure to oxygen or air. Reaction with CO₂ leads to faster chromia scale growth, the more rapid onset of breakaway and internal carburisation of the alloy.  Conventional and laser Raman microscopy studies of Fe-Cr alloys show that local fluctuations in scale thickness are associated with varying degrees of chromium depletion.  Local conversion of Cr₂O₃ to spinel leads to rapid outward iron diffusion and nucleation of Fe-rich oxide nodules. A TEM investigation reveals that reaction in CO₂ produces finer-grained Cr₂O₃, inward scale growth and more rapid scaling, as well as internal carburisation. Appropriate silicon additions to the alloys lead to the formation of a thin, glassy silica layer beneath the chromia, greatly slowed chromia thickening rates and the prevention of carburisation. Atom probe tomography is used to locate carbon within the chromia.

David J. Young 教授是国际高温氧化与腐蚀领域著名专家，在中低温氧化、混合气氛腐蚀、内氧化、富炭环境中金属粉尘化，以及固态扩散等研究方向取得了大量研究成果，并对石油化工工业CO₂气氛高温腐蚀行为开展了大量研究。他单独和合作出版了“High Temperature Oxidation and Corrosion of Metals”、“Diffusion in the Condensed State”等著作，并在一系列科研著作中撰写章节（“Progress in Solid-State Chemistry”、“Determination of Thermodynamic Properties”、“Encyclopedia of Applied Physics”、“Shreir’s Corrosion”等），多次在Gorden Research Conference等会议上作邀请报告，获得英国“U.R. Evans 奖”和美国电化学学会“高温材料杰出成就奖”，发表SCI收录文章350余篇。

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