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首页> 外文期刊>Materials Chemistry and Physics >Aging and thermal behavior of a PVA/Al microspheres slurry for aluminizing purposes
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Aging and thermal behavior of a PVA/Al microspheres slurry for aluminizing purposes

机译：用于镀铝目的的PVA / Al微球浆料的老化和热行为

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摘要

The aging and thermal behavior of an environmentally friendly slurry composed of water, polyviny-lalcohol (PVA) and aluminum microspheres for aluminizing superalloy substrates is studied in this work. Different ratios of the slurry components were characterized at room temperature by Fourier-Transformed Infrared Spectroscopy (FTIR), while for the intermediate (<550℃) and high (<1100℃) temperatures differential scanning calorimetry (DSC) and coupled thermo-gravimetric analysis (TGA)/differential thermal analysis (DTA) techniques were respectively employed. Aging the slurry with time at room temperature confirmed the stability of the solutions up to five days (FTIR). DSC and coupled TGA-DTA allowed to characterize the specific temperature of the organic binder (melting at 220 ℃ and PVA decomposition from 275 ℃), as well as the deshydroxylation (460 ℃), melting (660℃) and oxidation reactions associated with the metallic Al in the slurry. Bonding of Al to PVA was confirmed from the broad temperature intervals at which PVA decomposed when compared to pure PVA. The energetic evolutions with temperature for aged and unaged slurries also seemed to be similar regardless of the Al particle size. It is therefore concluded that the slurries remained very stable with time and their evolution with temperature could allow successful application to aluminize superalloy substrates.
机译：在这项工作中，研究了由水，聚乙烯醇（PVA）和铝微球组成的环保浆液的老化和热行为，该浆液用于铝基高温合金镀铝。在室温下，通过傅立叶变换红外光谱（FTIR）表征了不同比例的浆料组分，而对于中温（<550℃）和高温（<1100℃）的差示扫描量热法（DSC）和热重分析进行了分析。 （TGA）/差热分析（​​DTA）技术被分别采用。在室温下随时间老化浆液，确认溶液的稳定性长达五天（FTIR）。 DSC和偶联的TGA-DTA可以表征有机粘合剂的特定温度（在220℃熔融，从275℃分解PVA），以及脱羟基反应（460℃），熔融（660℃）和与有机溶剂相关的氧化反应。浆液中的金属铝。与纯PVA相比，从PVA分解的宽温度区间可以确认Al与PVA的键合。无论Al粒径如何，老化和未老化浆料的温度随能量的变化似乎也相似。因此得出的结论是，这些浆料随时间保持非常稳定，并且它们随着温度的变化可以成功地应用以对超级合金基材进行铝化。

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  • 来源
    《Materials Chemistry and Physics》 |2012年第1期|360-365|共6页
  • 作者

    B. Rannou; F. Velasco; S.Guzman; V.Kolarik; F.Pedraza;

  • 作者单位

    Universite de La Rochelle-CNRS 3474, Laboratoire des Sciences de l'Ingenieur pour l'Environnement (LaSIE), Avenue Michel Crepeau, 17042 La Rochelle Cedex 1, France,Fraunhofer lnstitutfiir Chemische Technologie ICT.Joseph-von-Fraunhofer-Strafie 7, 76327 Pfinztal, Germany;

    Universidad Carlos Ⅲ de Madrid, Materials Science and Engineering, Dept. Avenidad de la Universidad 30,28911 Leganes (Madrid), Spain;

    Universidad Carlos Ⅲ de Madrid, Materials Science and Engineering, Dept. Avenidad de la Universidad 30,28911 Leganes (Madrid), Spain;

    Fraunhofer lnstitutfiir Chemische Technologie ICT.Joseph-von-Fraunhofer-Strafie 7, 76327 Pfinztal, Germany;

    Universite de La Rochelle-CNRS 3474, Laboratoire des Sciences de l'Ingenieur pour l'Environnement (LaSIE), Avenue Michel Crepeau, 17042 La Rochelle Cedex 1, France;

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

    slurry; ageing; FTIR; DSC; TGA - DTA;

    机译：泥浆;老化;FTIR;DSC;TGA-DTA;

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