Damageability of the Al2O3 Oxide Coating on the Aluminum Substrate by Pulsed Beam Plasma and Laser Radiation

Autor: S. A. Maslyaev, S. V. Latyshev, A. S. Demin, I. P. Sasinovskaya, Marian Paduch, E. E. Kazilin, E. V. Morozov, K. N. Minkov, N. A. Epifanov, V. P. Sirotinkin, Vladimir A. Gribkov
Rok vydání: 2019
Předmět:
Zdroj: Inorganic Materials: Applied Research. 10:339-346
ISSN: 2075-115X
2075-1133
DOI: 10.1134/s2075113319020151
Popis: The following investigation of the damageability of the Al2O3 oxide ceramic coating on the aluminum substrate under the influence of the concentrated energy fluxes of different nature and pulse duration performed: pulsed laser radiation in the free running mode (at the power density of q = 105–2 × 106 W/cm2 and pulse duration of τi = 0.7 ms) and modulated Q-switched mode (q = 107–108 W/cm2, τi = 80 ns), as well as the beam-plasma influence at q = 107–109 W/cm2, τ = 50–100 ns. It is shown that, under the influence of laser radiation within the millisecond and nanosecond ranges of the pulse impact on a semitransparent ceramic coating, the partial destruction and peeling of the ceramic layer from the metal substrate is observed. The mechanisms of the observed damageability are determined. The threshold values of the laser radiation flux at which the coating is damaged, caused by peeling, are experimentally estimated. The distribution of the temperature in the surface layer of the samples was calculated by numerical simulation, and it was shown that during laser irradiation the temperature reaches its maximum values at the depth corresponding to the contact area between the coating and substrate. It was established that the impact on the aluminum samples with the ceramic coating from the fast deuterium ion fluxes and high temperature deuterium plasma in the plasma focus device results in melting and partial evaporation of the coating surface layer; but in this case, no cracking or peeling from the aluminum substrate is observed.
Databáze: OpenAIRE
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