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MICROSTRUCTURE EVOLUTION DURING OXIDATION OF MgO-SiC COMPOSITES

机译：MgO-SiC复合材料氧化过程中的微观结构演变

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摘要

1. Oxidation of SiC-MgO composites leads to three oxidation product scales: a dark layer, a porous white layer, and a columnar grain growth surface layer.rn2. The columnar growth layer exhibits a strong <200> texture.rnSc_2O_3 doping enhances the oxidation of MgO-SiC composites and increases the thickness of the surface grain growth layer.rn3. SIMS data indicate that ~(18)O enrichment occurs only in the grain growth layer.rn4. TEM investigation of the dark region shows the presence of partially oxidized SiC in contact with graphite and Mg_2SiO_4 which is consistent with models and observations of oxidation in similar composite systems.rn5. Elemental silicon in contact with large regions of graphite has been observed but is not easily explained by conventional models. It is postulated that the silicon is either an unexpected intermediate oxidation product or a relic of the starting SiC.
机译：1.氧化SiC-MgO复合材料会导致三种氧化产物鳞片：深色层，多孔白色层和柱状晶粒生长表面层。柱状生长层表现出很强的<200>织构。rnSc_2O_3掺杂增强MgO-SiC复合材料的氧化并增加表面晶粒生长层的厚度。 SIMS数据表明〜（18）O富集仅发生在晶粒生长层。 TEM对暗区的研究表明，存在与石墨和Mg_2SiO_4接触的部分氧化的SiC，这与相似的复合体系中的氧化模型和观察结果一致。已经观察到与大面积石墨接触的元素硅，但是用常规模型不容易解释。据推测，硅要么是意想不到的中间氧化产物，要么是起始SiC的残留物。

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  • 来源
  • 会议地点 Berkeley CA(US)
  • 作者

    D. J. Aldrich; M. E. F. Carney; D. W. Readey;

  • 作者单位

    Colorado Center for Advanced Ceramics Colorado School of Mines Golden, CO 80401;

    Colorado Center for Advanced Ceramics Colorado School of Mines Golden, CO 80401;

    Colorado Center for Advanced Ceramics Colorado School of Mines Golden, CO 80401;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TQ174.01;
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