Internal oxidation of Ag–VC composites

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• 作者：Polona Š ; kraba ; Ladislav Kosec ; Milan Bizjak ; Rebeka Rudolf ; Nebojš ; a Ž ; . Romč ; ević ; Gorazd Kosec ; Borut Kosec ; Zorica Ž ; . Lazarević ; Jož ; e Roth ; Ivan An
• 关键词：A. Metal matrix composites ; A. Silver ; B. SEM ; B. X-ray diffraction ; C. Internal oxidation
• 刊名：Corrosion Science
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：53
• 期：1
• 页码：127-134
• 全文大小：1477 K

文摘

The internal oxidation (IO) of Ag–VC composites containing 5 vol. % of carbide was examined at three oxidation temperatures (350, 400, 600 °C). Two mechanisms were observed due to the formation of double oxides with relatively low-melting points. At temperatures below the lowest eutectic point in situ, or diffusion less IO, was observed with the formation and growth of oxide layers surrounding the initial carbide. At temperatures above the eutectic point IO resulted in the formation of liquid oxide pools, which grew in size and developed into a network of oxides within the metal matrix. The kinetics confirmed the presence of two distinct mechanisms.