Ceramic composite layers with glassy nanocarbon
Andrzej Posmyk, Henryk Wistuba 1 Politechnika Śląska, Wydział Transportu, ul. Krasińskiego 8, 40-019 Katowice, Poland 2 Uniwersytet Śląski, Wydział Nauk o Ziemi, Międzywydziałowa Pracownia Badań Strukturalnych, ul. Będzińska 60, 41-200 Sosnowiec, Poland
Quarterly No. 1, 2008 pages 31-35
DOI:
keywords: composite layer, nanotubes, glassy carbon, sliding
abstract The producing technology principles and selected properties of composite layers with ceramic matrix including nano tubes of glassy carbon have been presented in this paper. The matrix of the layers is the electrolytic formed anodic oxide covering. Due to the porous structure of anodic oxide layer a synthesis of carbon nanotubes in the pores of oxide cells is possible. The synthesis has been conducted due to bringing of substance including carbon into the pores and its carbonisation. Result of these is a composite layer including very hard, wear resistant oxide covering in that are regular distributed glassy carbon nanotubes which serve as grease reducing friction and wear. Such layer can be used in machinery’s pairings acting under conditions in which using of lubricants is not allowed, for example in electronic, food and pharmaceutical industry. The elaborated composite layer - short named AHC+GC - has been formed on machinery’s part destined for non lubricated pairings. These investigated parts in form of disc have been made of aluminium alloy EN-AW-6061. As counterpartner has been chosen cast iron EN-GJL-350, used for piston rings manufacturing. The investigations have been carried out on tribological tester T11 in ambient temperature and air with relative humidity 60%. To have the possibility to evaluate the investigated layer the comparative investigations of anodic hard coating (AHC) without glassy carbon nanotubes have been carried out. Friction coefficient during sliding of cast iron against AHC+GC was lower then the one in pairing cast iron/AHC.