Isobaric sealed device for measuring oxygen exchange coefficient and oxygen diffusion coefficient

Abstract

The invention discloses a constant-pressure sealed type device for measuring the oxygen exchange coefficient and the oxygen diffusion coefficient. The device comprises an experimental platform device, a material conductivity test device, an input and output device, a data analysis system, a gas mixing device, an atmosphere pre-heating device and a gas detecting device, wherein the experimental platform device comprises constant-pressure cabins, a transmission device, experiment cavities and a sample table, a to-be-measured experimental material sample arranged on the sample table is switched in different experimental cavity atmospheres in the whole testing process, a gap between a sliding shaft and a sliding track is reduced by a sealing ring, and constant-pressure balance between the cavities is realized; the gas mixing device is used for providing different oxygen partial pressure test gases; the atmosphere pre-heating device is used for controlling the gas temperature; the data analysis system is used for performing signal data fitting computation to obtain the oxygen exchange coefficient and the oxygen diffusion coefficient. According to the constant-pressure sealed type device for measuring the oxygen exchange coefficient and the oxygen diffusion coefficient, signal data are collected by the test device, so that data of the oxygen exchange coefficient and the oxygen diffusion coefficient of the material are obtained accurately and rapidly, and the material performance data are obtained.

Description

technical field [0001] The invention relates to a material physical performance testing device, in particular to a material oxygen conductivity testing device, which is applied in the technical field of material physical and chemical performance analysis and testing. Background technique [0002] In the process of studying the oxygen conduction process of the material system, the surface oxygen exchange coefficient (k) and bulk diffusion coefficient (D) are usually used to characterize the change of oxygen flow rate to characterize the corresponding two important processes - surface adsorption and bulk diffusion. To date, two methods of measurement are generally used to obtain these two parameters. One is the isotope exchange depth curve method (IEDP), using 18 The diffusion curve of O isotope in the sample is fitted to obtain two parameters. Another method is the electrical conductivity relaxation method (ECR), which changes the oxygen partial pressure in the surrounding ...

AI Technical Summary

Problems solved by technology

[0026] The existing analytical and testing devices for measuring oxygen exchange coefficient and oxygen diffusion coefficient are expensive and the data accuracy is not ideal

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