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High Temperature Oxidation of a Ti_3Al Alloy in Argon-5% SO_2 Environment

机译:Ti_3Al合金在氩5%SO_2环境中的高温氧化

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摘要

High temperature corrosion behavior of a Ti_3Al alloy was studied in an argon-5% SO_2 environment in the temperature range of 1123-1273 K using a thermogravimetric (TGA) apparatus. Results of experiments in the form of weight gained per unit surface area as a function of time were analyzed to determine the reaction kinetics. Weight gain curves followed the parabolic rate law. Activation energy of 313 kJ was obtained from the plot of logarithm of parabolic rate constant (k_p) versus 1/T. Effective activation energy of oxidation of Ti_3Al alloy in argon-5% SO_2 was comparable to that obtained for oxidation of a similar binary alloy in pure oxygen. The treated alloy was characterized for the type and morphology of phases present on the surface of the alloy using X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) equipped with an Energy Dispersive X-ray analyzer (EDX). The XRD analysis revealed the presence of TiO_2 and Al_2O_3 as the products of oxidation. No sulfides were formed in the temperature range of experiments due to very low sulfur pressure in the gaseous environment. At all the temperatures of this study the oxide scale was not adherent to the alloy.
机译:使用热重分析仪(TGA),研究了Ti_3Al合金在5%氩气下的SO_2环境中在1123-1273 K温度范围内的高温腐蚀行为。分析以每单位表面积获得的重量作为时间的函数形式的实验结果,以确定反应动力学。体重增加曲线遵循抛物线速率定律。从抛物线速率常数(k_p)对1 / T的对数图可得出313 kJ的活化能。 Ti_3Al合金在5%氩气中氧化的有效活化能与在纯氧中类似二元合金的氧化有效活化能相当。使用配备有能量色散X射线分析仪(EDX)的X射线衍射(XRD)和扫描电子显微镜(SEM),对处理后的合金的特征在于存在于合金表面的相的类型和形态进行表征。 XRD分析表明存在作为氧化产物的TiO_2和Al_2O_3。由于气体环境中的硫压非常低,因此在实验温度范围内未形成硫化物。在该研究的所有温度下,氧化皮均未附着在合金上。

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  • 来源
    《High temperature materials and processes》 |2004年第2期|p.93-101|共9页
  • 作者

    D. Mantha; X. Wen; R. G. Reddy;

  • 作者单位

    Department of Metallurgical and Materials Engineering The University of Alabama, Tuscaloosa, AL 35487-0202, U. S. A.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 金属学与热处理;
  • 关键词

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