The aim this study consists in a preliminary analysis of some composites based on tin (Sn) and graphite polyamide. We do not intend to elucidate the intimate phenomena of the components interface and not even to establish the optima values of technological parameters of obtaining processes of these composites.Microstructure analysis offers the results upon the Sn particles dispersion in the polyamide matrix. Tribologically properties (weight losses and friction coefficients) were determined and discussed in correlation with the concentration and distribution of Sn in samples.
The aim of paper is to establish the values of pollution agents in the thermal treatment sector of S. C. "Rulmenti" S.A. Barlad. Data upon noxes generated as interactions between heat processed bear pieces and chemical substances used as treatment media bear pieces are presented. The air pollution is due to some chemical reactions and to the evaporation of some volatile substances. Possible methods in order to reduce pollution agents concentration are presented.
The metallic interior surfaces with cylindrical symmetry have been processed by knocking them with centrifuged balls. The first author has designed the used processing tool and it has been carried out under his instructions. There have been processed cast iron and carbon steel samples, using 80 different combinations for the process parameters: axial advance S, tangential rotation speed of the processed piece V, and the impact force F between the balls and the processed surface. Using the measured values of roughness Ra, Vickers microhardness HV and of the depths of cold-hardening h, we have achieved and used an optimizing computer program for the qualitative parameters of the cold-hardening process, i.e. Ra, HV and h. Also, we found optimal solutions for the processing regime. The study establishes the ability to increase the mechanical characteristics of the turned out metallic surfaces, thus taking out any further mechanical, thermal and/or chemical superficial processing. The results of the current study allow a correct choice of the processing regimes for different materials with similar bulk properties.
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