Influence of the duration of aging the system Ti/Al2O3 in a hydrogen atmosphere on hydrogen sorption, adhesion, tribology, and electrical conductivity of the film
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 5, Issue 12
Abstract
This paper reports results on the interaction between an aluminum oxide film, deposited on technically pure titanium of grade VT1-0 by the magnetron reactive sputtering method, and a hydrogen-containing atmosphere. Such a study is important in order to find protective coatings that would prevent the penetration of hydrogen inside a product. A given system aged in a hydrogen atmosphere in the interval of 1‒4 hours at a pressure of 2∙10<sup>5</sup> Pa (2 bar) and a temperature of 400 °C. We have acquired data on the distribution of hydrogen along a film thickness and its content in a thin-film system. It is shown that hydrogen diffuses into the film and builds up in it up to three hours, and only then it begins to penetrate the substrate. We have managed to increase aging duration in a hydrogen-containing environment and increase the temperature of heating up to the stage of film destruction. In the case of the starting film and after aging from 1 to 3 hours the adhesion force between a film and a substrate increases, apparently due to the formation of hydrogen bonds film-substrate. The adsorption of hydrogen atoms at the surface of the Al<sub>2</sub>О<sub>3</sub> film is accompanied by an increase in its conductivity by not larger than 4 % with the increased time of aging. Such a change in the conductivity of the Al<sub>2</sub>О<sub>3</sub> film can be explained based on the formation of a zone structure. Thin oxide films may possess continuous one-side conductivity, but in the case the film is thick (0.5 µm and above), it is not possible to argue about the one-side conductivity. The data acquired on the influence of aging duration in a hydrogen atmosphere indicate an increase in adhesive strength by almost 6 times within 3 hours and by 2.5 times in 4 hours. The determined coefficient of film friction increases by not larger than 2.5 times. By measuring the electrical conductivity of the film surface, it was found that it increases with an increase in the time of aging in a hydrogen atmosphere. This pattern is obviously linked to the creation of transitions of the p-n-type in the film of aluminum oxide at the expense of hydrogen ions
Authors and Affiliations
Vladimir Sypchenko, Evgeniya Kiselyova, Thorstein Sigfusson, Elena Lisichko, Ludmila Semkina, Natalya Efremova, Vera Rudkovskaya
Keywords
Related Articles
- EP ID EP528235
- DOI 10.15587/1729-4061.2018.144501
- Views 59
- Downloads 0
Synthesis of robust controllers for the control systems of technological units at iron ore processing plants
<p>In order to synthesize a robust system of control over technological units, an analysis of appropriate mathematical models was performed. The uncertainty of models of technological iron ore processing units was accoun...
Examining the effect of production conditions at territorial logistic systems of milk harvesting on the parameters of a fleet of specialized road tanks
<p class="a"><span lang="EN-US">We have studied the influence of changing production conditions and components of transportation processes on the need in specialized vehicles in the milk harvesting systems. Based on the...
Determining the characteristics of diffracted sea waves of finite amplitude around a vessel in considerable shallow waters
<p>Vessels at shallow-water outer anchorage are exposed to a complex system of waves. This system results from the diffraction of sea-incident waves against a ship. When entering shallow waters, three-dimensional waves t...
Development of energy-saving technology to maintain the functioning of a wind-solar electrical system
<p>An integrated system to support the functioning of a wind-solar electric system has been designed, based on predicting a change in the capacity of a rechargeable battery when measuring voltage at the input to a hybrid...
A study of multilayered electrochromic platings based on nickel and cobalt hydroxides
The multilayered electrochromic films based on Ni(OH)<sub>2</sub> and Co(OH)<sub>2</sub> have been prepared using sequential cathodic template deposition for solutions containing polyvinyl alcohol, nickel nitrate and cob...