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2 Prace Naukowe Instytutu Konstrukcji i Eksploatacji Maszyn Politechniki Wrocławskiej. Konferencje

2 2002

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Investigation of tribological behaviour of electropulse sprayed copper alloy coatings

Jankauskas V., Padgurskas J., Andriusis A.

Prace Naukowe Instytutu Konstrukcji i Eksploatacji Maszyn Politechniki Wrocławskiej. Konferencje

2002

Vol. 87, nr 27

113-118

In engineering technology the greatest losses are caused by friction since the majority of parts are deprived of normal operation when their working surfaces wear up to 0,2 mm. The most popular friction couple is a sliding friction couple. Its shaft is made of steel and a hub is bronze or brass. Thermally sprayed copper alloy coatings are considered to possess good tribotechnical characteristics. Metallographic investigation of electropulse sprayed copper alloy coatings indicates that the coatings are of particularly fine-grained microstructures, minimal porosity, uneven hardness and chemical composition. Tribological tests of these coatings prove them to have good performance characteristics i.e. low coefficient of friction (0,004...0,006), higher resistance to wear, feasibility of loading friction couples by considerably greater relative loads and formation of a wear-resistance effect. The cause of a very low coefficient of friction in the friction couples with copper and brass sprayed coatings is coating characteristics.

Investigation of fluoroligomeric coats

Padgurskas J., Milvydas A., Rukuiza R., Prosycevas I., Guobiene A.

Prace Naukowe Instytutu Konstrukcji i Eksploatacji Maszyn Politechniki Wrocławskiej. Konferencje

2002

Vol. 87, nr 27

263-269

Fluoroligomers are liquid steamy oligomeric compounds of fluorine with oxygen and carbon. The chemosorbic compounds with metal are composing after coating the surface of detail with fluoroligomer. The aim of this research is to investigate the formation regularity of fluoroligomeric coats and influence of those materials to on the mechanical properties of surface. It was estimated that the thickness of fluoroligomeric coats depends on its concentration and coating method, but practically not depends on number of treatments. The coat evenness depends on number of coatings, oligomer concentration and coating method. Increment the concentration and treatment number increases the coat evenness. The molecules in fluoroligomeric coat layer at the pad of material are oriented parallel to the pad. This orientation changes receding from the pad. The fluoroligomer treatment decreases the micro-hardness of solid body till 15 % at 0,03 ... 0,04 mm deep because of chemosorbic interaction with steel. The change of micro-hardness decreases receding from the solid surface.