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Reduction kinetics of oxides in PM steels

机译：PM钢中氧化物的还原动力学

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摘要

Efficient reduction of surface oxides formed during water atomization of PM steels is critical in order to obtain stronger necks and to achieve the required mechanical properties for sintered parts. In this work dry oxidation behavior and reduction kinetics were evaluated for pure iron (ASC 100.29) and low chromium steel (Astaloy CrM) through microstructural characterization and temperature programmed reduction (TPR) respectively. DRX analysis at several incident angles and optical microscopy evidenced different oxide layer structures for both sintered materials after pre-oxidation treatment in air at 700°C for 45 minutes. TPR runs were carried out with 90%Ar-10%H_2 atmosphere at constant heating rates on pre-oxidized powders with or without admixed graphite. The obtained TPR peaks sequences and the corresponding activation energies and pre-exponential factors indicates significant influence of chromium and carbon content during the reduction processes. TPR is shown as a valuable technique to understand solid-gas interactions phenomena during sintering and powder fabrication.
机译：为了获得更坚固的颈部并获得烧结零件所需的机械性能，有效还原PM钢水雾化过程中形成的表面氧化物至关重要。在这项工作中，分别通过微结构表征和程序升温还原（TPR）对纯铁（ASC 100.29）和低铬钢（Astaloy CrM）的干氧化行为和还原动力学进行了评估。在多个入射角进行的DRX分析和光学显微镜证明，在700°C的空气中进行45分钟的预氧化处理后，两种烧结材料的氧化物层结构不同。 TPR试验是在90％Ar-10％H_2气氛下以恒定加热速率对有或没有混合石墨的预氧化粉末进行的。所获得的TPR峰序列以及相应的活化能和指数前因子表明，还原过程中铬和碳含量的显着影响。 TPR被显示为了解烧结和粉末制造过程中固-气相互作用现象的一种有价值的技术。

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  • 来源
  • 会议地点 Florence(IT);Florence(IT)
  • 作者

    P. Ortiz; J.SPenuela; O. Gamba; S. Moreno;

  • 作者单位

    CIPP-CIPEM. Department of Chemical Engineering. University of Los Andes, Carrera 1E N° 19A-40. Of 778. Edificio Mario Laserna. Bogota, Colombia;

    rnCIPP-CIPEM. Department of Chemical Engineering. University of Los Andes, Carrera 1E N° 19A-40. Of 778. Edificio Mario Laserna. Bogota, Colombia;

    rnEstado Solido y Catalisis Ambiental, Departamento de Quimica, Facultad de Ciencias,Universidad Nacional de Colombia, AK 30 No. 45-03, Bogota, Colombia;

    rnEstado Solido y Catalisis Ambiental, Departamento de Quimica, Facultad de Ciencias,Universidad Nacional de Colombia, AK 30 No. 45-03, Bogota, Colombia;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 粉末冶金（金属陶瓷工艺）;
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