首页> 外文会议>Electrical Contacts, 1993., Proceedings of the Thirty-Ninth IEEE Holm Conference on >Influence of oxygen concentration and humidity on palladium oxide formation by a mechanochemical reaction
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Influence of oxygen concentration and humidity on palladium oxide formation by a mechanochemical reaction

机译:氧浓度和湿度对通过机械化学反应形成氧化钯的影响

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Palladium oxide formed on the electrode surfaces of palladium electrical contacts by a mechanochemical reaction during mechanical switching generally causes significant contact resistance rise. In the present paper, the influence of oxygen concentration and humidity on this phenomenon is examined. It has been found that palladium oxide is formed even when the oxygen concentration is less than 0.01% under the condition that influence of aqueous vapor or organic gases is negligible. As the oxygen concentration decreases, both the contact resistance and the palladium oxide formation rate decrease. Experimental results indicate that the presence of water delays or prevents palladium oxide formation. The proposed model for this effect is that water molecules absorbed onto the contact surfaces act to lubricate to smooth the contact spots, thereby minimizing the palladium oxide formation rate.
机译:在机械开关过程中通过机械化学反应在钯电触点的电极表面上形成的氧化钯通常会导致显着的接触电阻上升。在本文中,研究了氧气浓度和湿度对该现象的影响。已经发现即使在水蒸气或有机气体的影响可以忽略的条件下,即使氧浓度小于0.01%,也会形成氧化钯。随着氧浓度的降低,接触电阻和氧化钯的形成速率均降低。实验结果表明,水的存在会延迟或阻止氧化钯的形成。为此效果建议的模型是吸收到接触表面上的水分子起到润滑作用,以使接触点变光滑,从而使氧化钯的形成速率最小化。

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