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COMPOZITES AND MULTIPURPOZE COATINGS
ArticleName Electrophysical properties of Cu – Nb composites. Part 1. Methodology of analysis of electrophysical properties of composites and samples` characteristics
ArticleAuthor Baryshev G. K., Pantsyrnyy V. I., Biryukov A. P., Surin V. I.
ArticleAuthorData

National Research Nuclear University “MEPhI”, Moscow, Russia:

G. K. Baryshev, Post-Graduate Student, e-mail: gkbaryshev@mephi.ru
A. P. Biryukov, Student
V. I. Surin, Assistant Professor

 

“Russian superconductor” JSC, Moscow, Russia:

V. I. Pantsyrnyy, Chief Development Officer

Abstract

This work describes the methodology of analysis of properties of 2-phase metallic-matrix Cu – Nb composites by means of structure-sensitive methods of functional electrophysical diagnostics. The Cu – Nb composite samples had the shape of thin wires (0.2 mm in diameter and 0.2–0.5 m in length). Electrical resistance, thermoelectric power and differential contact potential difference were sequentially measured by datameasuring system. The microstructure of composite was researched at the scanning electronic microscope before the experiments were started. Electrical resistance was measured with 4-point method with further calculation of specific electric resistance and current-voltage characteristic plotting. Differential thermoelectric power of the composite was measured relatively to chromel, copper and technical nickel. The wires with diameter from 0.1 mm (Ni) to 0.23 mm (Cu) were used as comparing electrodes. In the process of contact potential measuring, there was used a mobile sensor, which makes possible to carry out measurings at various positions of the sample in conditions of straining relaxation (at given deformation value). Stepwise straining was realized at room temperature with the step height of ~10–3 and holding time of 6–7 min. Angular rate of the stressing system reached up to ~1 degree per second. The contact potential of measuring probe was made of steel. The reference probe was taken away from the measuring base. The
Cu – Nb composite contact potential was measured at five positions at the distance of 2, 12, 22, 32 and 42 sm from the reference point, which made it possible to carry out the analysis of dynamics of changing of inherent stress along the sample.

keywords Cu – Nb composites, functional electrophysical diagnostics, surface deformation activity, contact potential, electrical resistance, thermoelectric power, electrophysical properties of wires, information measuring system
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