Apparatus and method for determining gas diffusion coefficient of low-intensity low-permeability coating material

Abstract

The invention provides an apparatus and a method for determining gas diffusion coefficient of a low-intensity low-permeability coating material, which relates to the coating material coefficient determination apparatus and the method thereof. The apparatus comprises two paralleled vacuum chambers of a measuring chamber and an aeration chamber which are connected through an air exhaust channel with a seal flange, the seal flange faces to one side of the aeration chamber, a disk shaped blank flange or a test sample is fixed in a sealing mode by using a flange gland and a sealing ring; an operable aeration chamber door is arranged in the aeration chamber, which is used for arranging or dismounting the blank flange or the test sample; an aeration chamber pressure gauge, an aeration pipeline having a pressure adjusting control valve and an air exhaust pipeline having an aeration chamber valve are arranged in the aeration chamber; the measuring chamber pressure gauge and the air exhaust pipeline having a measuring chamber valve are arranged in the measuring chamber, and the background leakage rate of the measuring chamber is relatively stationary. The apparatus can use a thin coating material for measurement, for the low-permeability coating material, data for stabilization of gas pressure and gas flux can be rapidly acquired, and the measurement result is accurate.

Description

technical field [0001] The invention relates to a solid coating measurement device and method, in particular to a low-strength, low-permeability coating material gas diffusion coefficient measurement device and method. Background technique [0002] At present, the gas chamber method and the mass method are mainly used to measure the gas mass transfer diffusion coefficient in solid materials. The gas chamber method is to place the measured material in the middle of two chambers or the outlet of a single chamber, and calculate the mass transfer characteristic parameters of the material by monitoring the concentration change of the target gas on both sides of the material or detecting the concentration of the target gas in the equilibrium state. If two static chambers are used, the calculation results are uncertain, so in order to ensure the accuracy of the measurement data, the dynamic chamber method is generally used. This method requires a large pressure difference on both ...

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Problems solved by technology

[0005] Low-strength coating materials are not enough to withstand the large pressure difference on both sides, and the large pressure difference cannot be used to speed up the gas transmission rate; the coating material cannot form an effective measurement shape alone, and cannot obtain a larger active area for data Measurement; if the thickness is increased, the gas diffusion data cannot be obtained quickly for coating materials with low permeability. If the measurement time is too long, the measurement data will be inaccurate

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