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首页> 外文学位 >Evaluation of the effectiveness of alkaline-earth metal oxides in inhibiting vanadium-induced hot corrosion of yttria-stabilized zirconia thermal barrier coatings (TBCs)
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Evaluation of the effectiveness of alkaline-earth metal oxides in inhibiting vanadium-induced hot corrosion of yttria-stabilized zirconia thermal barrier coatings (TBCs)

机译：评价碱土金属氧化物抑制钒稳定的氧化钇稳定的氧化锆热障涂层（TBC）的有效性

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摘要

Vanadium-induced hot corrosion is an accelerated high temperature corrosion of yttria stabilized zirconia (YSZ) ceramic topcoat in Thermal Barrier Coatings (TBCs) of gas turbine engines. It occurs due to YSZ interaction with fused vanadium salt that results from the usage of fuel contaminated with vanadium. The hot corrosion causes spallation and degradation of the topcoat due to reaction of yttria stabilizer (Y2O3) with the vanadium salt based on Lewis-acid mechanism and presence of molten acidic salts; and transformation of the yttria stabilized zirconia from tetragonal zirconia phase to monoclinic.;The use of alkaline earth-metal oxides (MgO and CaO) to inhibit vanadium-induced hot corrosion of YSZ has been investigated experimentally using powder and as-sprayed samples. Samples with alkaline-metal/vanadium-oxide molar concentrations of 1, 2, 3 and 5 were subjected to 900°C isothermal heating for up to 100hrs and subsequent cooling in laboratory air. Characterizations by colour spectrum, XRD, SEM, EDS and X-ray mapping analyses were carried out to estimate the phase distribution. Samples with low molar concentrations of 1 and 2 indicated degradation and destabilization of the 8YSZ within short period of heating while those with high molar concentration ratios showed inhibition effect of vanadium-induced hot corrosion. CaO showed better inhibition when compared to MgO of the same molar concentration to V2O 5. Samples with MgO/V2O5=5, CaO/V2O 5=3 and CaO/V2O5=5 molar concentrations displayed high inhibition efficiencies. The mechanism of inhibition is found to be consistent with Lewis-acid mechanism.
机译：钒引起的热腐蚀是燃气涡轮发动机的热障涂层（TBC）中氧化钇稳定的氧化锆（YSZ）陶瓷面漆的加速高温腐蚀。它的发生是由于YSZ与熔融钒盐的相互作用，这是由于使用受钒污染的燃料而产生的。由于基于路易斯酸机理的氧化钇稳定剂（Y2O3）与钒盐的反应以及熔融酸性盐的存在，热腐蚀导致面漆散裂和降解。碱土金属氧化物（MgO和CaO）用于抑制钒诱导的YSZ热腐蚀的研究已通过粉末和喷雾样品进行了实验研究。将碱金属/钒氧化物摩尔浓度分别为1、2、3和5的样品进行900°C等温加热长达100小时，然后在实验室空气中冷却。通过色谱，XRD，SEM，EDS和X射线映射分析进行表征，以估计相分布。摩尔浓度为1和2的样品表明在短时间内加热会降低8YSZ的稳定性，而摩尔浓度比较高的样品则表现出钒诱导的热腐蚀的抑制作用。与摩尔浓度与V2O 5相同的MgO相比，CaO表现出更好的抑制作用。MgO / V2O5 = 5，CaO / V2O 5 = 3和CaO / V2O5 = 5摩尔浓度的样品显示出高抑制效率。发现抑制机理与路易斯酸机理一致。

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  • 作者

    Gbadamosi, Aliyu Arisekola.;

  • 作者单位

    King Fahd University of Petroleum and Minerals (Saudi Arabia).;

  • 授予单位 King Fahd University of Petroleum and Minerals (Saudi Arabia).;
  • 学科 Mechanical engineering.
  • 学位 M.S.
  • 年度 2013
  • 页码 197 p.
  • 总页数 197
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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