Coatings Systems: Chromium Carbide, Nitride and Carbonitride
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2005, Vol 28, Issue 1
Abstract
The process of the chemical deposition from vaporous implies the adsorption of the mobile atoms (monomers) on the substrate surface, their migration with embryos and stable nucleus formation, followed up by further growth through the adsorption of new atoms on the surface and also by the nucleus coalescence. The final structure of the deposed layer is given by various effects such as, the adsorption of impurities, the incorporation of gaseous, the co-deposition of another elements, the crystallization, etc. The ultimate properties of the coatings are further dependent on the nature and composition on the substrate. Therefore, in theory a vast number of substratecoating combinations is possible, with its own set of physical and chemical characteristics. If the vapor chemical deposition takes place within a tubular continuous reactor, a gas carrying the reacting species is passed over the substrate. At the substrate surface, the reacting elements undergo a number of chemical reactions leading to the product formation. Part of the products are deposited on the substrate and part of it goes back to the gas stream [1]. Before examining the vapor chemical deposition reactions it must be determined if the reaction is possible thermodynamically, if the calculated concentrations (partial pressures) of the reactants under equilibrium conditions are less than their initial values.
Authors and Affiliations
Stela CONSTANTINESCU
Keywords
Related Articles
- EP ID EP664765
- DOI -
- Views 105
- Downloads 0
Study of Tribocorrosion Processes by Electrochemical Techniques
Tribocorrosion is defined as the chemical-electrochemical-mechanical process leading to a degradation of materials in sliding, rolling or erosion contacts immersed in a corrosive environment. That degradation results fro...
FEM Analysis of the Spur Gears Press–Rolling Process
This paper presents the FEM (finite element method) analysis of the pressingrolling process, a new method for obtaining spur gears. Using symmetries, the 3D geometrical model was created for tools and for the initial bla...
Electrical Properties of Ultra-Sonicated Epoxy Resin
As ultra-sonication is a mostly used method to disperse the particles into the polymer matrix, the aim of this study is to point out the effect of epoxy’s exposure to ultra-sounds over the electrical properties, especial...
Method and Procedure for Checking the Accuracy of the Scan-Indexing System of the NDTUT Equipment for Immersion Technique
This paper deals with the proposal of a method and procedure to verify the accuracy of the scanning-indexing system of the NDT-UT facility for immersion technique, using comparison with a plate of aluminum alloy plate, p...
Analysis and Recovery of Sludge from the Waste Water Filtering Station of Galaţi for Use in Agriculture
The paper presents a study on the use of sludge from sewage treatment plants for the purpose of using it in agriculture. The use of biosolids in agriculture is considered the most sustainable option of sewage-sludge mana...