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首页> 外文期刊>Applied Surface Science >The wetting behaviour of silver on carbon, pure and carburized nickel, cobalt and molybdenum substrates
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The wetting behaviour of silver on carbon, pure and carburized nickel, cobalt and molybdenum substrates

机译：银在碳，纯和渗碳镍，钴和钼基材上的润湿行为

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摘要

Properties such as thermal and electrical conductivity or the expansion behaviour of silver matrix composites with carbon based inclusions are strongly affected by the contact angle between carbon and silver. In order to promote wetting of carbon, insertion of metallic interlayers such as nickel, cobalt or molybdenum is a feasible approach. This paper presents contact angle measurements done with the sessile drop method on carbon substrates (glassy carbon, polycrystalline graphite) and on pure nickel, cobalt and molybdenum foils. The ability of these interlayer elements to lower the high contact angles of silver on glassy carbon (117°) and polycrystalline graphite (124°) under vacuum conditions was verified. Unlike nickel (30°) and cobalt (26°), molybdenum (107°) nevertheless was not wettable by liquid silver (at 1273 K) under vacuum conditions. ToF-SIMS was used to identify oxygen on the surface, causing higher contact angles than expected. After oxide reduction a contact angle of 18° on molybdenum was detected. Fuerthermore, the influence of carbon diffusion on the contact angle was investigated by gas phase carburization of the metal foils. ToF-SIMS and XRD identified dissolved carbon (Ni, Co) and carbide formation (Mo). However, only nickel and cobalt showed a slight decrease of the contact angle due to carbon uptake.
机译：具有碳基夹杂物的银基复合材料的性能（如导热性和导电性）或膨胀行为会受到碳与银之间的接触角的强烈影响。为了促进碳的润湿，插入金属中间层如镍，钴或钼是可行的方法。本文介绍了使用无滴法在碳基材（玻璃碳，多晶石墨）以及纯镍，钴和钼箔上进行的接触角测量。这些中间层元件在真空条件下具有降低银在玻璃碳（117°）和多晶石墨（124°）上的高接触角的能力。与镍（30°）和钴（26°）不同，钼（107°）在真空条件下不能被液态银（在1273 K下）润湿。 ToF-SIMS用于识别表面上的氧气，从而导致比预期更高的接触角。氧化物还原后，检测到与钼的接触角为18°。此外，通过金属箔的气相渗碳研究了碳扩散对接触角的影响。 ToF-SIMS和XRD确定了溶解的碳（Ni，Co）和碳化物的形成（Mo）。但是，由于碳的吸收，只有镍和钴的接触角略有减小。

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  • 来源
    《Applied Surface Science》 |2010年第14期|p.4697-4701|共5页
  • 作者

    Robert C. Hula; Christian Edtmaier; Markus Holzweber; Herbert Hutter; Christoph Eisenmenger-Sittner;

  • 作者单位

    Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164, A-1060 Wien, Austria;

    Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164, A-1060 Wien, Austria;

    Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164, A-1060 Wien, Austria;

    Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164, A-1060 Wien, Austria;

    Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A 1040 Wien, Austria;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    contact angle; sessile drop method; silver; carbon; MMC; interface thermal conductance;

    机译：接触角固着法银;碳;MMC;界面导热;

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