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In military and mining industry are many machine elements – in our case idlers (for tanks, conveyors, and any others machineries which are using transmissions system which are subjected of coverage with low friction proprieties powder. These machine elements (idlers) must have low friction coeficient, because the functionality of the entire transmissions systems depends on them. Also the maintenance costs are very high, that is why we proposed to studies how to improve the performances of this machine elements. Researches in surface engineering allow the obtaining of new systems of materials by coating the basic material surface with other material having superior friction properties. In order to improve the machine elements durability, wear resistance, friction, we proposed to obtain a new system of materials using Atmospheric Plasma Spraying – with Sulzer 9MCE equipment. We have chosen the steel type 34CrNiMo6, MOCN class, STAS 691 - 880 as basic material and we coated it with Al2O3 powder. We made the samples and we tested them. The analysis has been made with Tribometre, which produces some data which link us to a low friction coeficient. The Al2O3 coating deposited on steel substrate is uniformaly deposited on the based steel, and need to be polished to decrease the friction coeficient. The results showed that the new material has a better microstructure than the basic material and its physical and mechanical properties have been improved. |
