Book/Report

FZJ-2018-02655

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermal shock testing of ceramics with pulsed laser irradiation

Benz, R.FZJ* ; Naoumidis, A.FZJ* ; Nickel, H.FZJ*

1986
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/18286

Report No.: Juel-2056

Abstract: Arguements are presented showing that the resistance to thermal stressing ("thermal shock") under pulsed thermal energy deposition by various kinds of beam irradiations is approximately proportional to $\phi \sqrt{tp}$, where $\phi_{a}$ is the absorbed power density and tp is the pulse length, under conditions of diffusivity controlled spreading of heat. In practical beam irradiation testing, incident power density, $\phi$, is reported. To evaluated the usefulness of $\phi \sqrt{tp}$ as an approximation to $\phi \sqrt{tp}$, damage threshold values are reviewed for different kinds of beams (electron, proton, and laser) for a range of tp values 5x10$^{-6}$ to 2s. Ruby laser beam irradiation tests were made on the following ceramics : AIN, BN, graphite, $\alpha$-SiC, $beta$-SiC coated graphites, ($\alpha + \beta$)Si$_{3}$N$_{4}$, CVD (chemical vapor deposition) TiC coated graphite, CVD TiC coated Mo, and CVD TiN coated IN 625. The laser beam pulse lengths investigated were 9x10$^{-4}$ (normal) and 5x10$^{-6}$s (saturable dye Q-switched) and the power densities ranged from 25 to 4000 kW/cm$^{2}$ corresponding to $\phi \sqrt{tp}$ values of 0.8 to 8.8 kJ/cm$^{2}$s$^{1/2}$.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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