High temperature oxidation behavior and mechanism of Ti₃SiC₂–SiC nanocomposites in air

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• 作者：Jianfeng Zhang ; Lianjun Wang ; Wan Jiang ; Lidong Chen
• 关键词：A. Ti₃SiC₂ ; B. Ultra-fine SiC ; C. Oxidation mechanism
• 刊名：Composites Science and Technology
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：68
• 期：6
• 页码：1531-1538
• 全文大小：1716 K

文摘

In this work, the oxidation kinetics and morphology of the oxide phases of Ti₃SiC₂–SiC nanocomposites in air from 1000 to 1400 °C is reported. The incorporation of ultra-fine SiC were found to have beneficial effects on the oxidation behavior of Ti₃SiC₂, and the weight gain decreased with the increment of SiC. The parabolic rate constant of Ti₃SiC₂–30 vol. % SiC composite oxidized at 1200 °C for 12 h decreased about one order of magnitude compared to that of the monolithic Ti₃SiC₂. At the same time, the thickness of the oxide scale as well as the oxide surface grain size of Ti₃SiC₂–30 vol. % SiC composite changed little with the prolonging oxidation time. At above 1200 °C, however, the oxidation process speeded up, and the adhesive and protective oxide scales were destroyed. The worsening oxidation resistance of Ti₃SiC₂ and the passive–active oxidation transition of ultra-fine grain size of SiC were the possible reasons.