CN217766197U - Sample composition for testing resistivity of heterogeneous material - Google Patents
Sample composition for testing resistivity of heterogeneous material Download PDFInfo
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- CN217766197U CN217766197U CN202220026155.2U CN202220026155U CN217766197U CN 217766197 U CN217766197 U CN 217766197U CN 202220026155 U CN202220026155 U CN 202220026155U CN 217766197 U CN217766197 U CN 217766197U
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Abstract
An object of the utility model is to provide a sample composition for testing heterogeneous material resistivity, the sample combination comprises heterogeneous material sample, pure copper sample and the supplementary piece sample of pure copper, wherein: the heterogeneous material sample consists of a heterogeneous material body and two pure copper blocks, wherein the pure copper blocks are respectively positioned at the upper end and the lower end of the heterogeneous material body and are bonded on the heterogeneous material body through conductive silver paste, and the section sizes of the pure copper blocks and the heterogeneous material body are the same; the pure copper auxiliary block sample consists of two pure copper blocks, and the two pure copper blocks are bonded together through conductive silver paste. The sample composition can solve the problem of large error caused by non-uniformity of the sample when the voltage of the sample is tested by four contacts.
Description
Technical Field
The utility model belongs to material electrical property test field provides a sample composition that is used for four contact methods to test heterogeneous combined material resistivity very much.
Background
The four-contact method is a good test scheme for eliminating (or reducing to a small) lead resistance-induced errors. Generally used for measuring a resistor with a lower resistance value, the principle that the four-contact method can perform more accurate measurement is as follows: the current and voltage measurements of the sample are measured separately by the current loop and the voltage loop, eliminating the impedance of the lead and probe contact resistances, resulting in a more accurate resistance value (see fig. 1).
The four-contact method has no difference in the point-taking position of the voltage electrode on the sample when the homogeneous material is tested. However, when testing a layered composite material or a heterogeneous sample, the voltage values measured by the voltage electrodes at different sampling positions have large difference, which results in large error.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sample composition for testing heterogeneous material resistivity is because the inhomogeneous great problem of error that leads to of sample when mainly solving four contact test sample voltages.
The technical scheme of the invention is as follows:
a sample composition for testing resistivity of a heterogeneous material, comprising: the sample combination is composed of a heterogeneous material sample, a pure copper sample and a pure copper auxiliary block sample, wherein:
the heterogeneous material sample consists of a heterogeneous material body and two pure copper blocks, wherein the pure copper blocks are respectively positioned at the upper end and the lower end of the heterogeneous material body and are bonded on the heterogeneous material body through silver paste, and the section sizes of the pure copper blocks and the heterogeneous material body are the same;
the pure copper auxiliary block sample consists of two pure copper blocks, and the two pure copper blocks are bonded together through silver paste.
Further:
the cross-sectional dimensions of the pure copper blocks are the same.
The pure copper block is made of oxygen-free copper.
The end face of the pure copper block is vertical to the axis, and the parallelism of the upper end face and the lower end face is less than 20 mu m.
The end face of the heterogeneous material body is vertical to the axis, and the parallelism of the upper end face and the lower end face is small by 20 micrometers.
The silver paste is conductive silver paste, and the silver content is more than or equal to 90%.
Adopt the sample composition tests heterogeneous material resistivity's concrete step as follows:
step one, preparing a heterogeneous material body, and measuring the length, width and height (for calculating the resistivity) of the heterogeneous material body.
And step two, preparing a pure copper sample, and testing the resistivity of the pure copper sample (for calculating the resistance of the pure copper block).
And step three, preparing a plurality of groups of pure copper blocks, wherein the cross section size of each group of pure copper blocks is consistent with the cross section size of the inhomogeneous material body. Bonding two pure copper blocks together through conductive silver paste to prepare a pure copper auxiliary block sample, then testing the overall resistance of the sample, comparing the resistance with the resistance of the pure copper sample, subtracting the resistance of the two pure copper blocks to obtain contact resistance, and measuring the average value of the two pure copper blocks for multiple times to obtain the average contact resistance.
And step four, bonding the heterogeneous material body and the pure copper blocks together through conductive silver paste to form a combination body with the middle part being the heterogeneous material and the two ends being the pure copper blocks, and testing the overall resistance of the combination body (as shown in figure 3, the heterogeneous material body in the figure is made of a composite material).
And step five, measuring the effective length of the pure copper block actually participating in resistance measurement, and calculating the effective resistance of the pure copper block participating in measurement. The effective resistance and average contact resistance of the pure copper block were subtracted from the total resistance. The electrical resistance of the heterogeneous material is obtained. And calculating the resistivity of the heterogeneous material according to the size of the heterogeneous material body.
And step six, testing the resistivity of the heterogeneous material in different directions.
The utility model discloses an increase pure copper conducting block at heterogeneous material both ends, bond pure copper conducting block and heterogeneous material through silver thick liquid, form a combination, the test electrode test includes partial pure copper conducting block, contact resistance, heterogeneous material resistance. The resistors comprise pure copper conductive block resistors, heterogeneous material resistors and contact resistors. The exact value of the contact resistance is difficult to determine, but is in a range. When the contact resistance is far smaller than the resistance of the heterogeneous material, the average contact resistance measured for many times can be used as the contact resistance, the resistance of the heterogeneous material can be obtained after the pure copper conductive block and the average contact resistance are deducted from the resistance of the combination, and the resistivity of the heterogeneous material is obtained according to a resistivity formula.
Drawings
FIG. 1 is a schematic diagram of the principle of measuring resistivity by a four-contact method.
FIG. 2 is a schematic diagram of the structure of a sample used for measuring resistivity by the four-contact method.
FIG. 3 is a schematic diagram of the principle of calculating resistivity of a composite of a heterogeneous material and pure copper.
FIG. 4 is a schematic structural diagram of a sample of heterogeneous material in which the current flow is parallel to the direction of the graphite sheet (the direction of the arrow is the current flow direction).
Fig. 5 is a schematic structural diagram of a heterogeneous material sample with current flow perpendicular to the direction of the graphite sheet (the direction of the arrow is the direction of current flow).
Fig. 6 is a schematic structural diagram of a pure copper sample and a pure copper auxiliary block sample.
Reference numerals are as follows: 1. the test device comprises a heterogeneous material sample, 2 pure copper samples, 3 pure copper auxiliary block samples, 4 pure copper blocks, 5 constant current loop first contact electrodes, 6 constant current loop second contact electrodes, 7 voltage loop first contact electrodes, 8 voltage loop second contact electrodes, 9 conductive resistors, 10 and to-be-tested resistors.
Detailed Description
The following describes the present invention in detail with reference to the accompanying drawings. The following examples are given on the premise of the technical solution of the present invention, and specific embodiments and procedures are given, but the scope of the present invention is not limited to the following examples.
A sample composition for testing the resistivity of a heterogeneous material, said sample composition consisting of a heterogeneous material sample 1, a pure copper sample 2 and a pure copper auxiliary block sample 3, wherein:
the heterogeneous material sample 1 consists of a heterogeneous material body and two pure copper blocks 4, wherein the pure copper blocks 4 are respectively positioned at the upper end and the lower end of the heterogeneous material body and are bonded on the heterogeneous material body through conductive silver paste (the silver content is more than or equal to 90%), and the cross section sizes of the pure copper blocks 4 are the same as those of the heterogeneous material body;
the pure copper auxiliary block sample 3 is composed of two pure copper blocks 4, and the two pure copper blocks 4 are bonded together through conductive silver paste.
The pure copper sample 2 and the pure copper block 4 are made of oxygen-free copper and have the same cross-sectional size.
The end face of the pure copper block 4 is vertical to the axis, and the parallelism of the upper end face and the lower end face is less than 20 mu m.
The end face of the heterogeneous material body is vertical to the axis, and the parallelism of the upper end face and the lower end face is small by 20 micrometers.
The method for testing the resistivity of the heterogeneous material comprises the following steps:
the method comprises the following steps:
preparing a non-homogeneous material body (the non-homogeneous material is laminar pyrolytic graphite), wherein the size of the non-homogeneous material body is 4 x 4mm square, the roughness of each face is 3.2 mu m, and the parallelism of 3 pairs of parallel faces is not more than 20 mu m. The 3 faces of the apex angle are perpendicular to each other.
And step two, preparing a pure copper sample with the size of 4 x 15mm, and testing the resistivity of the pure copper to obtain the resistivity of the pure copper of 17.7n omega m.
And step three, preparing the four pure copper blocks with the block size of 4 x 6 mm. And bonding the two pure copper blocks together by using conductive silver paste, testing the resistance of the two blocks for three times after curing, taking an average value of 88n omega, and subtracting the resistance of the corresponding pure copper from 8.5n omega to obtain the contact resistance. This was repeated three times to obtain an average contact resistance of 79.5 n.OMEGA.
And step four, the resistivity of the laminar pyrolytic graphite is directional, and the difference between the current and the graphite sheet layer is larger. The resistivity of the sample was first tested parallel to the direction of current flow. Two pure copper blocks and a laminar pyrolytic graphite body are bonded together through silver paste to form a combination body with the size of 4 x 16mm. The overall resistance of the assembly was tested as 579.2n Ω by maintaining the current parallel to the direction of the layered pyrolytic graphite.
And step five, knowing that the distance between the two electrodes is 7.8mm, the height of the heterogeneous material body is 4mm, the effective length of the pure copper block actually participating in resistance measurement is 7.8-4.0=3.8mm, and the effective resistance value of the pure copper block participating in measurement is calculated to be 4.4n omega. The total resistance minus the effective resistance and average contact resistance of the pure copper blocks: 579.2-4.4-79.5 x 2=415.8n Ω. The resistance of the laminar pyrolytic graphite body is obtained. The resistivity was calculated to be 0.853n Ω m, based on the size of the layered pyrolytic graphite body.
Step six, repeating the steps one to five to obtain the total resistance 288 mu omega, subtracting the contact resistance and the resistance of the pure copper block: 288 μ Ω -4.4n Ω -79.5 × 2n Ω =287.8 μ Ω, and the resistivity of the laminar pyrolytic graphite perpendicular to the laminar direction of current was calculated to be 0.593 μ Ω m.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Moreover, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Claims (6)
1. A sample composition for testing resistivity of a heterogeneous material, comprising: the sample combination is composed of a heterogeneous material sample, a pure copper sample and a pure copper auxiliary block sample, wherein:
the heterogeneous material sample consists of a heterogeneous material body and two pure copper blocks, wherein the pure copper blocks are respectively positioned at the upper end and the lower end of the heterogeneous material body and are bonded on the heterogeneous material body through silver paste, and the section sizes of the pure copper blocks and the heterogeneous material body are the same;
the pure copper auxiliary block sample consists of two pure copper blocks, and the two pure copper blocks are bonded together through silver paste.
2. The sample composition for testing resistivity of heterogeneous materials according to claim 1, wherein: the cross-sectional dimensions of the pure copper blocks are the same.
3. The sample composition for testing resistivity of heterogeneous materials according to claim 1, wherein: the pure copper block is made of oxygen-free copper.
4. The sample composition for testing resistivity of heterogeneous materials according to claim 1, wherein: the end face of the pure copper block is vertical to the axis, and the parallelism of the upper end face and the lower end face is less than 20 mu m.
5. The sample composition for testing resistivity of heterogeneous materials according to claim 1, wherein: the end face of the heterogeneous material body is vertical to the axis, and the parallelism of the upper end face and the lower end face is small by 20 micrometers.
6. The sample composition for testing resistivity of heterogeneous materials according to claim 1, wherein: the silver paste is conductive silver paste, and the silver content is more than or equal to 90%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220026155.2U CN217766197U (en) | 2022-01-06 | 2022-01-06 | Sample composition for testing resistivity of heterogeneous material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220026155.2U CN217766197U (en) | 2022-01-06 | 2022-01-06 | Sample composition for testing resistivity of heterogeneous material |
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| CN217766197U true CN217766197U (en) | 2022-11-08 |
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| CN202220026155.2U Active CN217766197U (en) | 2022-01-06 | 2022-01-06 | Sample composition for testing resistivity of heterogeneous material |
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- 2022-01-06 CN CN202220026155.2U patent/CN217766197U/en active Active
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