Copper–Tin Materials for Tribotechnical Purposes View Full Text


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Article Info

DATE

2020-05

AUTHORS

T. F. Grigoreva, S. A. Kovaleva, V. I. Zhornik, S. V. Vosmerikov, P. A Vityaz, N. Z. Lyakhov

ABSTRACT

The products of mechanochemical synthesis in the Cu–20% Sn system at various stages of mechanical treatment were studied by X-ray diffraction, micro X-ray spectral analysis, and electron microscopy in backscattered electrons. At the initial stage (40 s), an intermetallic compound Cu6.26Sn5 is formed, the formation of a solid solution of tin in copper begins with an increase in the processing time, and after 20 min of treatment, a solid solution Cu(Sn) with nanoscale crystallites becomes the only product of synthesis. The products of mechanochemical synthesis of the Cu–20% Sn system were consolidated by electrocontact sintering. Sintering of mechanocomposites after treatment up to 8 min occurs by the liquid-phase mechanism. The coatings formed during sintering have a small number of pores, microhardness of 1460 MPa, and low wear intensity under dry friction (0.0049 mg/m). Electrocontact sintering of mechanocomposites with the structure of a solid solution Cu(Sn) formed after 20 min of mechanical treatment passes through the mechanism of solid-phase sintering and ends with formation of a homogeneous alloy Cu(Sn) with a significant number of discontinuities. The coating is characterized by high microhardness (2350 MPa) and increased wear intensity (0.087 mg/m). Combining precursors obtained by mechanical treatment for 40 s and 20 min in a ratio of 40 : 60 (wt %) allowed forming a coating with a high microhardness, low wear intensity, and low friction coefficient by the method of electrocontact sintering. More... »

PAGES

744-749

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s207511332003017x

DOI

http://dx.doi.org/10.1134/s207511332003017x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1128557377


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