The inventory in and the permeation through fusion reactor structures of hydrogen and its isotopes play an important role in the machine operation, evolution of material properties, and safety. An experimental and research activity for the determination of permeability (and derived parameters) of gases in solid matrices is described. It uses a gas permeation method, that basically consists in the measure of the time evolution of the gas pressure in a chamber in which vacuum has been previously made (downstream volume). This chamber is separated from another one, full of the gas in exam (upstream volume), by means of a membrane of the materia! under study. The experimental installation is described. The first stage of be experimental activity bas dealt with the st-up of the device, the volume calibration, and the definition of the parameters range for which the installation can give reliable measurements. The subsequent stage of the activity has consisted in the measurement of the permeability, and then of the diffusion coefficient, of nitrogen in some materials at room temperature. Concurrently with the experimental activity, a model bas been set-up and implemented in a computer code: this code permits to evaluate the time evolution of the pressure in the downstream chamber. With this code, using the measured parameters, the time evolution of the pressure experimentally measured has been satisfactorily reproduced

An Experimental Device for Measurement of Gas Permeation in Solid Matrices / DE SALVE, Mario; Mazzi, E.; Zucchetti, Massimo. - STAMPA. - 1:(1996), pp. 639-650. (Intervento presentato al convegno International Symposium on Material Chemistry in Nuclear Environment tenutosi a Tsukuba nel March 14-15,1996) [10.13140/RG.2.1.1560.0249].

An Experimental Device for Measurement of Gas Permeation in Solid Matrices

DE SALVE, Mario;ZUCCHETTI, MASSIMO
1996

Abstract

The inventory in and the permeation through fusion reactor structures of hydrogen and its isotopes play an important role in the machine operation, evolution of material properties, and safety. An experimental and research activity for the determination of permeability (and derived parameters) of gases in solid matrices is described. It uses a gas permeation method, that basically consists in the measure of the time evolution of the gas pressure in a chamber in which vacuum has been previously made (downstream volume). This chamber is separated from another one, full of the gas in exam (upstream volume), by means of a membrane of the materia! under study. The experimental installation is described. The first stage of be experimental activity bas dealt with the st-up of the device, the volume calibration, and the definition of the parameters range for which the installation can give reliable measurements. The subsequent stage of the activity has consisted in the measurement of the permeability, and then of the diffusion coefficient, of nitrogen in some materials at room temperature. Concurrently with the experimental activity, a model bas been set-up and implemented in a computer code: this code permits to evaluate the time evolution of the pressure in the downstream chamber. With this code, using the measured parameters, the time evolution of the pressure experimentally measured has been satisfactorily reproduced
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1411157
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