Microstructure and Microhardness of Chrome-Oxide Coating Precipitating from Gases Phase Using Liquid of Metal Organic Chrome Compositions

In this work, the research team analyzes the effect of oxygen-containing additives on the microstructure and microhardness of coatings of the specimens obtained during applying pyrolytic chrome coating using metal-organic compounds (MOC) in order to obtain protective coatings. The results showed that chromium oxidation in the final phase of the coating process changed the microstructure and mechanical properties of the coating. The resulting coatings exhibit excellent adhesion, high microhardness (6-8 and up to 20-22 GPa depending on the experimental conditions) and better microplasticity, corrosion and wear resistance. In this work the effect of oxidizer on the microstructure and microhardness will be illustrated.

Driven Granular Media and Dissipative Gases: Phase Transitions and Instabilities

We study a simple model of a granular material or powder where the particles are excited by an external noise source and dissipate energy by inelastic collisions. Due to the inelastic collisions between particles there is an effective interaction between them. In one dimension this leads to long-range correlations between the particles in a gas phase despite the absence of long-range forces between the particles. In two dimensions the dissipative effects cause a very sharp liquid–gas phase transition at which the susceptibility has a pronounced peak. In the presence of a double-welled potential the inelasticity causes a symmetry-breaking instability where all the particles cluster into one of the wells.