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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2005, Volume9

155 pages

DOI: 10.1615/HighTempMatProc.v9.i2

Issue price - $144.00

STUDY OF THE PHASES FORMED DURING THE GROWTH OF THICK COATINGS WITH COARSE GRAINED TIN

G. Vourlias
Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

N. Pistofidis
Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

P. Patsalas
Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

E. Pavlidou
Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

G. Stergioudis
Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

E. K. Polychroniadis
Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

ABSTRACT

The microstructural and morphological properties of the as-prepared tin (Sn) coating on ferrous substrates affects the lifetime as well as the applicability of the coating itself. In order to improve our knowledge of this system, strips of steel St-37 were coated with Sn in the form of gas-atomized powder, with an average diameter of 110±10 μm, using plasma spraying. The plasma gas was an Ar-He mixture and the current intensity was 650 A. The as-casted coating was characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD) and conventional transmission electron microscopy (CTEM). It was deduced that the coating is characterized by high integrity, although certain pores were detected far from the Fe-Sn interface. However they refer to less than 1% of the total volume. Nevertheless the examination with SEM and XRD proved that the coating is mainly composed of pure Sn. However, interdiffusion takes place between the two phases (Fe-Sn) at their interface as deduced by CTEM. As a result, certain Fe-Sn phases are formed, which seem to be scattered in the coating close to the interface in the form of small inclusions.