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Tester for testing fiber axial heat conduction performance and production method thereof

A technology of thermal conductivity and fiber, which is applied in the field of specimen and preparation of fiber axial thermal conductivity test, which can solve the problems of difficulty in testing and so on.

Active Publication Date: 2017-05-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the samples of this method are generally isotropic bulk materials, and it is difficult to test for fiber materials with a single filament diameter of several microns and anisotropic characteristics.

Method used

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  • Tester for testing fiber axial heat conduction performance and production method thereof
  • Tester for testing fiber axial heat conduction performance and production method thereof
  • Tester for testing fiber axial heat conduction performance and production method thereof

Examples

Experimental program
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preparation example Construction

[0054] The present invention also provides a method for preparing the above-mentioned test piece for fiber axial thermal conductivity test, comprising the following steps:

[0055] Provide three grippers, and make the axes of the three grippers the same line;

[0056] Arrange the fibers to be tested and run through the inside of the three-piece holder;

[0057] Stretch the grippers at both ends to the outside of both ends;

[0058] Cut the fibers at both ends of the intermediate holder to obtain a test piece.

[0059] The present invention provides a three-piece holder, and makes the axes of the three-piece holder be the same straight line. In the present invention, the three-piece holders are spaced apart by a certain distance.

[0060] In the present invention, the fibers to be tested are arranged and run through the inside of the three-piece holder. In the present invention, if the holder is an open holder, the present invention preferably loads the fiber to be tested f...

Embodiment 1

[0067] Step 1: Calculation of Fiber Bundle Volume Filling Rate

[0068] In this example, the carbon fiber of model M40J is used, and the fiber body density is 1.81g / cm 3 , the number of fiber bundles in the cross-section is 808 bundles, and the fiber volume filling rate is calculated as 68% through formulas 1.1 to 1.4.

[0069] Step 2: Carbon Fiber Holder Preparation

[0070] The sample holder is a polyvinyl chloride tube with an inner diameter of 12mm, a wall thickness of 2mm, and a length of 1mm, and its side is cut parallel to the axis of the holder.

[0071] The schematic diagram of the structure of the clamper described in this embodiment is as follows figure 1 shown by figure 1 It can be seen that the holder is in the shape of a hollow straight cylinder, and the cylinder wall is provided with an opening parallel to the axis of the hollow straight cylinder.

[0072] Step Three: Fiber Loading

[0073] Cut the continuous fiber tow into neat fiber segments with a length...

Embodiment 2

[0081] Step 1: Calculation of Fiber Bundle Volume Filling Rate

[0082] In this example, the glass fiber model EC5.5-1212S110 is used. The diameter of the fiber monofilament is 5.5 μm, the density is 12tex, and the number of fiber bundles in the cross-section is 523 bundles. The fiber volume filling rate is calculated by formulas 1.1-1.4 to be 50%.

[0083] Step 2: Carbon Fiber Holder Preparation

[0084] A high-temperature-resistant polybenzimidazole (PBI) plastic tube is selected as the fiber holder, with a wall thickness of 5 mm, an inner diameter of 15 mm, and a length of 4 mm, and its side is cut parallel to the axis of the holder.

[0085] Step Three: Fiber Loading

[0086] Cut the continuous fiber tow into neat fiber segments with a length of 8 cm, soak the fiber segments in absolute ethanol for 20 minutes, take them out, arrange them neatly, and ensure that the fibers are not twisted, and at the same time avoid fiber bifurcation, fluffing and breakage. Arrange the th...

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Abstract

The invention provides a tester for testing fiber axial heat conduction performance. The tester comprises a clamp and a to-be-tested fiber contained in the clamp, wherein the clamp is of a hollow straight cylinder shape. The tester has the advantages that the filamentous fiber can be tightly fixed and allowed to have good straightness, and the tester can be well used for testing the fiber axial heat conduction performance. According to embodiment records, the tester is successfully used in laser flash analyzer detection, and the detected heat conduction coefficients of samples are respectively 156W / m.K, 0.7W / m.K and 52W / m.K.

Description

technical field [0001] The invention relates to the technical field of fiber thermal conductivity testing, in particular to a test piece for fiber axial thermal conductivity testing and a preparation method thereof. Background technique [0002] As a composite material reinforcement with excellent performance, fiber has been widely used in various fields. The development of high power and high integration of electronic devices also puts forward higher requirements on the heat dissipation performance of composite materials. Accurate characterization of the thermal conductivity of fiber reinforcements becomes the basis for designing high thermal conductivity composite materials. [0003] At present, there are various methods and instruments for measuring thermal conductivity, and these methods are mainly divided into two categories: steady-state method and unsteady-state method (dynamic method). According to the steady-state conditions described by the Fourier equation, the s...

Claims

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Application Information

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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 王绍凯顾轶卓王倩李敏张佐光
Owner BEIHANG UNIV
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