Usually, scraps of X22CrMoV12-1 alloy are obtained through machining of steam turbine blades and recycled through casting. However, this process is considered too costly. The viability of recycling X22CrMoV12-1 scraps with addition of vanadium carbide (VC) through powder metallurgy was analyzed in this study. Scraps of X22CrMoV12-1 alloy with VC were milled in a planetary ball mill during 10, 30 and 60 hours. The granulometry of the powder was determined through laser granulometry. The evolution in particles morphology and amorphization was conducted using scanning electron microscope (SEM) and x-ray diffraction (DRX) techniques. Stress-strain curves were obtained through compressive strength test. The results indicated that the best milling condition found was 60 hours. Also, the X22CrMoV12-1 alloy with VC addition produced by powder metallurgy showed good mechanical strength. Thus, this route was considered promising to reshape this material with smaller energy involved in the process.
Studies of constant current corona. negatively charged Teflon FEP samples, show a surface potential build up depending on the humidity content. In dry air atmosphieres it is possible to charge a sample to very high charge densities. In humid atmospheres the surface potential saturates at lower potentials. Charge centroid position measurements show that in samples charged under humid conditions the centroid position is deeper than in the case of dry conditions. On the other hand, surface charge decays much faster in humid atmospheres than in dry air. These results are explained in terms of a protonic model for charge transport, in Teflon FEP under humid conditions, in which the negative surface charges induce a drift of ions from the bulk to the surface charge layer.
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