Fabrication of nitrogen-containing coatings in reed switches by pulsed ion-plasma treatment

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• 作者：I. A. Zeltser ; V. S. Gurov ; N. B. Rybin…
• 关键词：arc discharge ; energy dispersive X ; ray microanalysis ; ion ; plasma treatment ; nitrogenated coatings ; reed switch ; scanning electron microscopy
• 刊名：Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：10
• 期：5
• 页码：1106-1118
• 全文大小：5,478 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Surfaces and Interfaces and Thin Films
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1819-7094
• 卷排序：10

文摘

We focus on the detailed characterization of the coatings produced by pulsed ion-plasma treatment on contact surfaces of permalloy (iron-nickel) blades directly in nitrogen-filled reed switches. The measurements of electrical resistance, breakdown voltage and return factor of reed switches were carried out in situ prior to and after ion-plasma treatment, and the morphology and elemental (chemical) composition of the coatings were monitored ex situ by means of scanning electron microscopy and energy dispersive X-ray microanalysis. The main processes occurring on the contact surfaces in the course of ion-plasma treatment were discussed in the frame of anomalous glow and arc discharges theories by Mesyats. It was shown that ionplasma treatment allows fabrication of erosion- and corrosion-resistant nitrogenated iron-nickel coatings with the electrical resistance of 0.1 Ohm. In the optimal symmetrical mode with the processing time of ca. 7 min the nitrogen concentration in the coatings was estimated of 20 at %. Higher and lower nitrogen content and the presence of oxygen in the coatings showed negative influence on the electrical resistance, which determines the quality of reed switches. Prototype models of the reed switches with nitrogenated coatings successfully passed switchgear reliability tests and demonstrated the competitive capacity as regards the standard reed switches with electroplating coatings based on the noble metals.