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首页> 外文期刊>Materials at High Temperatures >Effect of test atmosphere composition on high-temperature oxidation behaviour of CoNiCrAlY coatings produced from conventional and ODS powders
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Effect of test atmosphere composition on high-temperature oxidation behaviour of CoNiCrAlY coatings produced from conventional and ODS powders

机译:试验大气组合物对由常规和ODS粉末产生的同胞涂层高温氧化行为的影响

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摘要

The oxidation behaviour of free-standing CoNiCrAlY coatings produced by low-pressure plasma spraying using conventional powder and oxide dispersion strengthened (ODS) powder containing 2 wt. % Al-oxide dispersion was investigated. Thermogravimetric experiments at 1100 degrees C in Ar-20%O-2 and Ar-4%H-2-2%H2O showed lower oxidation rates of the ODS than the conventional coating. In the latter material the scale growth was enhanced by extensive Y-incorporation of Y/Al-mixed oxide precipitates in the scale and apparently by Y-segregation to oxide grain boundaries. In the ODS coating the alumina dispersion bonded Y in the form of Y-aluminate thereby effectively suppressing scale 'overdoping'. SEM/EBSD studies of all alumina scales revealed a columnar grain structure with the lateral grain size increasing approximately linearly with depth from the oxide/gas interface. For both coatings the alumina scale growth was slower in Ar-H-2-H2O than in Ar-O-2. The result is believed to be related to a lower oxygen potential gradient and to slower grain boundary diffusion in the scale forming in H-2/H2O containing gas.
机译:通过使用常规粉末和氧化物分散体产生的低压等离子体喷涂产生的独立式外皮涂层的氧化行为强化(ODS)含有2wt的粉末。研究了%氧化物分散体。在Ar-20%O-2和Ar-4%H-2-2%H 2 O中的热重试验在1100℃和Ar-4%H-2-2%H 2 O中显示出低于常规涂层的氧化率。在后一种材料中,通过广泛的Y掺入氧化物沉淀物的广泛的Y掺入,并且显然通过Y-偏析对氧化物晶界来增强了规模的生长。在ODS中,涂覆氧化铝分散体以Y-铝酸盐的形式键合Y,从而有效地抑制了尺度的“覆盖”。所有氧化铝鳞片的SEM / EBSD研究揭示了柱状晶粒结构,横向晶粒尺寸随着氧化物/气体界面的深度大致线性增加。对于涂层的涂层,氧化铝量表在Ar-H-2-H 2 O中较慢比Ar-O-2更慢。结果被认为与较低的氧潜在梯度相关,并且在含H-2 / H 2 O的气体中形成的尺度较慢的晶界扩散。

著录项

  • 来源
    《Materials at High Temperatures》 |2018年第3期|共11页
  • 作者单位

    Forschungszentrum Julich Inst Energy &

    Climate Res IEK Microstruct &

    Properties Mat IEK2 Julich Germany;

    Forschungszentrum Julich Inst Energy &

    Climate Res IEK Mat Synth &

    Proc IEK1 Julich Germany;

    Forschungszentrum Julich Inst Energy &

    Climate Res IEK Mat Synth &

    Proc IEK1 Julich Germany;

    Forschungszentrum Julich Inst Energy &

    Climate Res IEK Mat Synth &

    Proc IEK1 Julich Germany;

    Forschungszentrum Julich Inst Energy &

    Climate Res IEK Microstruct &

    Properties Mat IEK2 Julich Germany;

    Forschungszentrum Julich Inst Energy &

    Climate Res IEK Microstruct &

    Properties Mat IEK2 Julich Germany;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

    Oxidation; alumina scale; oxygen diffusion; ODS coating;

    机译:氧化;氧化铝量表;氧气扩散;ODS涂层;

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