A resistivity testing device that can control the temperature, atmosphere and density of powder materials

Abstract

The invention discloses a resistivity testing device capable of regulating the temperature, atmosphere and density of a powder material. Firstly, the equipment is small in volume and convenient, temperature regulation is performed through a constant-temperature zone of a tubular furnace, different electrodes are changed for connection at different temperatures and in different atmospheres, and direct contact resistance between the powder and a wire as well as the redox of an electrode at different temperatures and in different atmospheres is reduced, so that the accuracy of the test data is high; secondly, by adopting a straight-blowing gas supply way at the sealed bottom, direct contact between the gas and the powder as well as uniform gas distribution can be guaranteed, and uniform gas distribution is guaranteed and the problem of powder particle loss is solved through different numbers of gas guide plates; and finally, by adopting a screw type central pressurizing way and increasing the length of a pressurizing screw, uniform pressure distribution between the powder and the electrode can be guaranteed, the fixing stability is high, and the pressure is kept unchanged in the case of material expansion at a high temperature; and moreover, with the same powder mass, the resistivity of the powder of the same material and at different compaction densities is measured according to the rotation number of turns of the screw.

Description

technical field [0001] The invention relates to the technical field of testing the performance of powder materials, in particular to a resistivity testing device that can regulate the temperature, atmosphere and density of powder materials. Background technique [0002] Resistivity, also known as resistivity or the reciprocal of conductivity, is a physical quantity that describes the conductivity of materials. The study of electrical conductivity has been concerned by a large number of researchers in the fields of catalysis, electrochemistry and electronic technology. Resistivity is an important physical parameter to characterize the electrical conductivity of materials, and the measurement of electronic conductivity of powder materials is an indispensable and important parameter in the evaluation of material applications. Therefore, the test of resistivity is the key to the optimization of catalytic materials and the improvement of the preparation process of membrane elect...

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Problems solved by technology

In the invention patent designed by Chen Weidong et al. (CN200810216653.8), the powder is pressed through the tablet press first, and the metal powder is pressed on both sides of the pressed powder, and then the test device is connected to the AC through the DC shunt method. The resistivity of the powder is obtained by the impedance method. This method reduces the direct resistance between the compact and the wire through the metal powder. This method has high measurement accuracy, but the test method is single, and it has not considered the measurement of different temperatures, different atmospheres, and different compactions. Powder resistivity under density; In the invention patent (CN201310057222.2) designed by Wang Xindong et al., by pressing the powder into tablets and spraying, placing the powder in a test chamber for heating, the effect on the powder resistivity Test, this method can test the powder resistivity at different temperatures, but the measurement conditions for different atmospheres and different compacted densities still need to be improved; in the invention patent (CN200710103773.2) designed by Wu Shengben et al., through Put the test powder in the pressure storage bin for pressurization, and then measure the resistivity of the sample with the resistance tester. This method can measure the resistivity of the powder under different compaction densities, but for different temperatures and different atmospheres There are deficiencies in the measurement of powder resistivity

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