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首页> 外文会议>High temperature ceramic matrix compositei III >Development of Lanthanumhexaluminate Fiber-Coating via Sol-Gel-Route Using Inorganic and Organic Precursors
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Development of Lanthanumhexaluminate Fiber-Coating via Sol-Gel-Route Using Inorganic and Organic Precursors

机译：使用无机和有机前体通过溶胶-凝胶法开发六铝酸镧纤维涂层

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摘要

Oxide based fiber-reinforced composites are attractive materials in applications where long-term oxidation and high temperature stability are of primary importance. In such materials strong interfacial reactions are unavoidable due to the high diffusion rates of oxides. An interphase material which provides crack deflection or crack bridging, and thereby fiber pull-out, needs to be developed.rnLanthanumhexaluminate (LaAl_(11)O_(18)) is thus an interesting interphase material and the sol-gel process is an effective way to coat fiber yarns with a thin (< 500 nm) layer. Sols can be prepared from both organic and inorganic precursors. In this study, sols were prepared using various combinations of La(NO_3)_3, Al(NO_3)_3, Al-sec-butylate, Lanthanum oxalate, Lanthanum-2,4-pentanedionate and Lanthanum acetate. Subsequent gelation, drying and crystallization behavior were observed. The formation of LaAlO_3 could be suppressed by changing the starting materials. An all-organic precursor route resulted in the formation of LaAl_(11)O_(18) at significantly lower temperatures. LaAl_(11)O_(18) coatings on fibers were microstructurally characterized.
机译：氧化物基纤维增强复合材料在长期氧化和高温稳定性至关重要的应用中是有吸引力的材料。在这种材料中，由于氧化物的高扩散速率，不可避免的是强烈的界面反应。需要开发出提供裂纹挠曲或裂纹桥接，从而拉出纤维的相间材料。六铝酸镧（LaAl_（11）O_（18））是一种有趣的相间材料，溶胶-凝胶法是一种有效的方法用薄的（<500 nm）层涂覆纤维纱。可以从有机和无机前体制备溶胶。在这项研究中，使用La（NO_3）_3，Al（NO_3）_3，仲丁酸铝，草酸镧，镧-2,4-戊二酮酸酯和乙酸镧的各种组合制备溶胶。观察到随后的胶凝，干燥和结晶行为。通过改变原料可以抑制LaAlO_3的形成。全有机前体途径导致在明显较低的温度下形成LaAl_（11）O_（18）。对纤维上的LaAl_（11）O_（18）涂层进行了微观结构表征。

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  • 来源
  • 会议地点 Osaka(JP);Osaka(JP);Osaka(JP);Osaka(JP)
  • 作者

    L. Mayer; B. Saruhan; H. Schneider;

  • 作者单位

    German Aerospace Center, Institute for Materials Research, D-51147 Koeln (Cologne), Germany;

    German Aerospace Center, Institute for Materials Research, D-51147 Koeln (Cologne), Germany;

    German Aerospace Center, Institute for Materials Research, D-51147 Koeln (Cologne), Germany;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TQ174.58;
  • 关键词

    fiber-coating; sol-gel; precursor;

    机译：纤维涂层溶胶凝胶前体;

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