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Method and device for measuring conductivity of graphite

A measuring method and technology of measuring device, applied in the direction of material resistance, etc., can solve the problems of complex testing and high cost, and achieve the effect of ensuring the testing accuracy

Inactive Publication Date: 2013-02-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires heating. At the same time, in order to prevent the oxidation of graphite during the test, a protective atmosphere is required. In addition, the test conditions such as the heating rate must be well controlled, so the test is more complicated and the cost is higher.

Method used

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  • Method and device for measuring conductivity of graphite
  • Method and device for measuring conductivity of graphite
  • Method and device for measuring conductivity of graphite

Examples

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Embodiment 1

[0037]In this embodiment, graphite worm particles are obtained by expanding 50-mesh expandable flake graphite. The graphite worm particles are placed in a molding die and pressed into a highly conductive flexible graphite sheet under a pressure of 55 MPa. The conductivity of the surface perpendicular to the molding pressure is tested. The size of the sample to be tested is 2 (height) x 10 (width) x 40 (length) mm 3 (Graphite flakes are arranged parallel to the surface of 10mm×40mm). Apply a constant current DC current of 1A in the length direction of the sample to be tested, and measure the potential at equidistant points at intervals of 1mm, so as to obtain the potential distribution data of a series of points along the length direction inside the sample to be tested (such as image 3 Shown), the slope k calculated by the least square method is 0.26. Since the cross-sectional area S in the length direction is 10(width)×40(length)=400mm 2 , Therefore, according to the conduc...

Embodiment 2

[0039] In this embodiment, the electrical conductivity of isotropic graphite in two mutually perpendicular directions of X-axis and Y-axis is measured, and then the degree of isotropy is calculated. The sample size is 2 (height) × 10 (width) × 30 (length) mm 3 , apply a constant current direct current of 1A in the length direction of the sample, and carry out potential measurement at equidistant points with 1 mm intervals, and use the measurement method of the present invention to measure the conductivity of the sample in the X direction of the present embodiment to be 1700 (S / cm), and the conductivity in the Y direction is 2040 (S / cm). Comparing the conductivity values ​​in the X-axis and Y-axis directions, the calculated isotropy of the sample is 1.2 (C).

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Abstract

The invention relates to a method and a device for measuring the conductivity of graphite. The method comprises the following steps of: 1) arranging a pair of electrodes on a test sample platform, the lower part of which is provided with a micrometric displacement driving device, placing the graphite to be tested between the two electrodes, and connecting the two electrodes to the positive end and the negative end of a direct current (DC) power supply; 2) connecting the first test end of a voltmeter with the electrode which is connected with the positive end of the DC power supply, and at the same time, placing the second test end on the surface of the graphite to be tested; 3) driving the test sample platform by using the micrometric displacement driving device so as to drive the graphite to be tested to perform equidistant micromotion, and measuring and recording the potential values in the graphite to be tested point by point by using the voltmeter; 4) taking data points, which are distributed linearly along the direction to be tested, of the measured potential values in the graphite to be tested, and obtaining the linearly distributed slope k between the potential and the distance by a least square method; and 5) substituting the slope k between the potential and the distance and calculating the conductivity of the graphite to be tested in the direction to be tested. The method has the advantages of simple operation, low cost, capacity of measuring the conductivity of the graphite in any direction and suitability for measuring the conductivity of all kinds of anisotropic materials.

Description

technical field [0001] The invention relates to a conductivity measurement method and a measurement device thereof, in particular to a graphite conductivity measurement method and a measurement device. Background technique [0002] Natural flake graphite and flexible graphite are anisotropic in two mutually perpendicular directions, and the electrical and thermal conductivity are quite different, and this difference can almost reach more than 2 orders of magnitude. However, due to the advantages of high electrical conductivity, high thermal conductivity, and good chemical stability, graphite has a wide range of applications in the field of materials, and it is often used as a matrix or filler component of composite materials. During the preparation of composite materials, most of them need to go through molding processes such as molding, rolling or injection molding. The unidirectional molding pressure generated by these processes will cause the graphite in them to be orient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
Inventor 郑永平冯彪刘旋沈万慈
Owner TSINGHUA UNIV
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