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首页> 外文期刊>Plasma processes and polymers >Plasma-Immersion-Ion-Implantation of Fluorine to Protect TiAl-Components against High-Temperature Oxidation
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Plasma-Immersion-Ion-Implantation of Fluorine to Protect TiAl-Components against High-Temperature Oxidation

机译:氟离子注入-离子注入以保护TiAl组分免受高温氧化

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摘要

Titanium aluminides are promising light weight materials for several high-temperature applications, e.g., in aero engines but due to their insufficient oxidation resistance at temperatures above roughly 800 ℃ they cannot be used yet despite of their good mechanical high-temperature properties. The oxidation behavior of TiAl-alloys can be improved significantly by adding small amounts of fluorine into the subsurface zone of the components (microalloying). One possibility to apply fluorine to the surface of complex TiAl-components is the PI~3-technique (plasma-immersion-ion-implantation). The use of an Ar/CH_2F_2-plasma for the F-PI~3 into small coupons led to a positive effect which was as good as the beamline implantation of elemental fluorine gas into samples of the same geometry. Turbine blades, as examples for real TiAl-components, were implanted with an optimum set of parameters. Post-exposure investigations like scanning electron microscopy revealed a thin protective alumina scale on the surface of the implanted samples in contrast to a thick mixed oxide scale (TiO_2/ Al_2O_3) growing on untreated samples during high-temperature oxidation in air. The high-temperature oxidation resistance of several TiAl-alloys was improved by plasma-immersion-ion-implantation of fluorine. Small coupons showed a much lesser oxidation during high-temperature exposure after fluorine treatment than untreated samples. The performance of turbine blades for the low pressure compressor of a new generation of jet engines was also improved. Fluorine treated samples are covered with a thin, protective alumina scale after high-temperature exposure in air instead of a fast growing, nonprotective mixed oxide (TiO_2/Al_2O_3) scale which is found on untreated samples.
机译:铝化钛是有希望的轻质材料,可用于多种高温应用,例如在航空发动机中,但是由于它们在大约800℃以上的温度下抗氧化性不足,尽管它们具有良好的机械高温性能,但仍无法使用。通过将少量的氟添加到部件的亚表面区域(微合金化),可以显着改善TiAl合金的氧化行为。将氟施加到复杂的TiAl组分表面的一种可能性是PI〜3技术(等离子浸没离子注入)。将Ar / CH_2F_2-等离子用于F-PI〜3到小试样中,产生了积极的效果,与将元素氟气体束流注入相同几何形状的样品中一样好。涡轮叶片作为真实TiAl组件的示例,已植入一组最佳参数。曝光后的研究(如扫描电子显微镜)表明,在空气中高温氧化过程中,未经处理的样品上会生长出较厚的混合氧化物水垢(TiO_2 / Al_2O_3),而在注入的样品表面上的氧化铝保护层较薄。通过等离子浸没-离子注入氟改善了几种TiAl合金的高温抗氧化性。与未经处理的样品相比,小试样在氟处理后的高温暴露过程中的氧化作用要小得多。用于新一代喷气发动机的低压压缩机的涡轮叶片的性能也得到了改善。经过氟处理的样品在空气中高温暴露后用薄的保护性氧化铝垢覆盖,而不是在未经处理的样品中发现快速生长的无保护性混合氧化物(TiO_2 / Al_2O_3)垢。

著录项

  • 来源
    《Plasma processes and polymers》 |2009年第7期|434-439|共6页
  • 作者单位

    DECHEMA e.V. Karl-Winnacker-lnstitut, Theodor-Heuss-Allee 25, D-60486 Frankfurt/Main, Germany;

    Forschungszentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, Bautzener Landstr. 128, D-01328 Dresden, Germany;

    DECHEMA e.V. Karl-Winnacker-lnstitut, Theodor-Heuss-Allee 25, D-60486 Frankfurt/Main, Germany;

    Forschungszentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, Bautzener Landstr. 128, D-01328 Dresden, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fluorine; ion implantation; oxidation; titanium aluminides;

    机译:氟;离子注入氧化铝化钛;

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