Oxidation behavior of Ti3AlC2 at 1000-1400°C in air
Oxidation behavior of Ti3AlC2 at 1000-1400°C in air
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DOI：
10.1016/s0010-938x(02)00177-4
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发表时间：
2003-05-01
影响因子：
8.3
通讯作者：
Zhou, YC
中科院分区：
文献类型：
--
作者：
Wang, XH;Zhou, YC
采用热重分析（TGA）、XRD、SEM和能谱分析（EDS）等手段研究了体块Ti3AlC2在1000 ~ 1400℃空气中暴露20 h的等温氧化行为。结果表明，Ti3AlC2具有优异的抗氧化性能。Ti3AlC2的氧化一般遵循抛物线速率规律，其速率常数k(p)随着温度从1000℃升高到1400℃，从4.1 × 10（-11）增加到1.7 × 10(-8) kg(2) m(-4) s（-1）。在温度低于1300℃时形成的鳞片致密、粘连、耐循环氧化且呈层状。在温度低于1300℃时形成的这些鳞片的内层是连续的α - al2o3。当温度低于1200℃时，外层由金红石型TiO2变为1300℃时Al2TiO5和TiO2的混合物。在1400℃氧化的样品中，水垢由Al2TiO5和α - al2o3的混合物组成，而在较低温度下，水垢与基体的附着力较小。氧化膜/基体上一氧化碳的作用参与了连续Al2O3层的形成。(C) 2002 Elsevier Science Ltd.版权所有。
The isothermal oxidation behavior of bulk Ti3AlC2 has been investigated at 1000-1400 degreesC in air for exposure times up to 20 h by means of TGA, XRD, SEM and EDS. It has been demonstrated that Ti3AlC2 has excellent oxidation resistance. The oxidation of Ti3AlC2 generally followed a parabolic rate law with parabolic rate constants, k(p) that increased from 4.1 x 10(-11) to 1.7 x 10(-8) kg(2) m(-4) s(-1) as the temperature increased from 1000 to 1400 degreesC. The scales formed at temperatures below 1300 degreesC were dense, adherent, resistant to cyclic oxidation and layered. The inner layer of these scales formed at temperatures below 1300 degreesC was continuous alpha-Al2O3. The outer layer changed from rutile TiO2 at temperatures below 1200 degreesC to a mixture of Al2TiO5 and TiO2 at 1300 degreesC. In the samples oxidized at 1400 degreesC, the scale consisted of a mixture of Al2TiO5 and, predominantly, alpha-Al2O3, while the adhesion of the scales to the substrates was less than that at the lower temperatures. Effect of carbon monoxide at scale/substrate was involved in the formation of the continuous Al2O3 layers. (C) 2002 Elsevier Science Ltd. All rights reserved.