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首页> 外文期刊>Journal of Materials Research >Thermogravimetric analysis of the oxidation resistance of ZrB_2-SiC and ZrB_2-Sic-TaB_2-based compositions in the 1500-1900 ℃ range
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Thermogravimetric analysis of the oxidation resistance of ZrB_2-SiC and ZrB_2-Sic-TaB_2-based compositions in the 1500-1900 ℃ range

机译：ZrB_2-SiC和ZrB_2-Sic-TaB_2基组合物在1500-1900℃范围内的热重分析

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摘要

Theoretically dense ZrB_2-SiC two-phase microstructures were isothermally oxidized for ~90 min in flowing air in the range 1500-1900 ℃. Specimens with 30 mol% SiC formed distinctive reaction product layers that were highly protective; 28 mol% SiC-6 mol% TaB_2 performed similarly. At and above 1700 ℃, the composition with only 15 mol% SiC oxidized extensively because of deficient silicate liquid formation. Specimens with 60 mol% SiC were resistant to oxidation up to 1800 ℃; at 1900 ℃, this composition displayed periodic ruptures of the passivating layer by emerging gas bubbles. Oxide coating thicknesses calculated from weight loss data were consistent with those measured from scanning electron microscopy micrographs. A layer of ZrB_2 devoid of SiC was argued to be from preferential removal of SiC by reaction of a silica oxidation product with adjacent unreacted SiC to form escaping gases.
机译：理论上致密的ZrB_2-SiC两相微结构在1500-1900℃的流动空气中被等温氧化90分钟。含有30 mol％SiC的样品形成了具有高度保护性的独特反应产物层。 28 mol％SiC-6 mol％TaB_2的表现相似。在1700℃及更高温度下，由于硅酸盐液体形成不足，仅含15 mol％SiC的组合物被广泛氧化。 SiC含量为60 mol％的试样在1800℃以下具有抗氧化性能。在1900℃时，该成分表现为钝化层周期性地出现气泡破裂。由重量损失数据计算出的氧化物涂层厚度与由扫描电子显微镜显微照片测得的氧化物涂层厚度一致。认为不含SiC的ZrB_2层是通过二氧化硅氧化产物与相邻的未反应的SiC反应形成逸出气体而优先去除SiC而形成的。

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  • 来源
    《Journal of Materials Research》 |2011年第1期|p.96-107|共12页
  • 作者

    Fei Peng; Gregg Van Laningham; Robert F. Speyer;

  • 作者单位

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245;

  • 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);
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