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A kind of sample preparation method and device for measuring high temperature thermal diffusivity of fiber

A technology for measuring fiber and diffusion coefficient, applied in the direction of measuring device, test sample preparation, sampling, etc., can solve the problem of unclear and difficult fiber axial thermal conductivity, etc., and achieve the effect of ensuring parallelism

Active Publication Date: 2020-12-04
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For common high thermal conductivity fibers such as carbon fibers, most of them have a typical anisotropic structure, and their axial thermal conductivity has attracted extensive attention. However, due to the high aspect ratio of fibers, it is difficult to directly measure the axial thermal conductivity of fibers. , there is currently no clear standard

Method used

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  • A kind of sample preparation method and device for measuring high temperature thermal diffusivity of fiber
  • A kind of sample preparation method and device for measuring high temperature thermal diffusivity of fiber
  • A kind of sample preparation method and device for measuring high temperature thermal diffusivity of fiber

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preparation example Construction

[0046] The invention discloses a sample preparation method and device for measuring the high-temperature thermal diffusivity of fibers, comprising the following steps:

[0047] a. Measure fiber linear density ρ L ;

[0048] b. Wrap the fiber on the designed winding mold (1) or cut it into small sections to ensure the alignment of the fiber during subsequent filling;

[0049] c. Fill the fibers into a set of steel ring molds (2) designed to withstand high temperatures, so that the interior is filled with fibers;

[0050] d. cut off the fibers between the steel ring molds (2), and polish one side of the fiber-filled steel ring mold (2) with a grinding and polishing machine;

[0051]e. Use the clamp (3) designed to match the outer diameter of the steel ring mold (2) to clamp the steel ring mold (2) to grind the other side flat, and at the same time ensure that the previously polished side remains flat to ensure that the fiber sample (4 ) parallelism;

[0052] f. Measure the t...

Embodiment 1

[0069] The specific steps of the method and device for preparing a pitch-based carbon fiber sample capable of measuring high-temperature thermal diffusivity are as follows:

[0070] a. Accurately measure 3 pieces of pitch-based carbon fiber with a length of 3m with a ruler, and then cut them into 5cm-long sections with a blade. Each piece has a total of 60 pieces. Weigh each piece with an electronic balance and calculate the linear density of each fiber. Take the average value of the linear density ρ of 3 samples as the linear density ρ of the fiber L .

[0071] b. Select 2 high-temperature-resistant steel ring molds, with an inner diameter of 13mm, a height of 8mm, and a wall thickness of 1mm. According to the fiber volume fraction filled in the steel ring mold Calculate the number of fibers n that need to be filled for 65%, n=65%·πR 1 2 ·ρ V / 4ρ L .

[0072] c. Since the pitch-based carbon fiber is a brittle fiber, the winding mold cannot be used, so the fiber is cut...

Embodiment 2

[0080] The difference between the scheme of Example 2 and Example 1 is that the test fiber is T800 grade carbon fiber. The specific steps of the method and device for preparing a T800-grade carbon fiber sample capable of measuring high-temperature thermal diffusivity are as follows:

[0081] a. Use a ruler to accurately measure 3 parts of T800 grade carbon fiber with a length of 3m, and then cut them into 5cm long sections with a blade, each with a total of 60 small sections, weigh each piece with an electronic balance, and calculate the linear density of each fiber . Take the average value of the linear density of 3 samples as the linear density ρ of the fiber L .

[0082] b. Choose 2 high temperature resistant steel ring molds, the inner diameter is 13mm, the height is 3mm, and the wall thickness is 1mm. According to the fiber volume fraction filled in the steel ring mold Calculate the number of fibers n that need to be filled for 65%, n=65%·πR 1 2 ·ρ V / 4ρ L .

[...

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Abstract

The invention discloses a sample preparation method and device for measuring a high temperature thermal diffusion coefficient of a fiber. The sample preparation method for measuring the high temperature thermal diffusion coefficient of the fiber comprises the following steps: determining the fiber linear density [Rho]<L>; wrapping the fiber around a designed winding mold or cutting into small pieces to ensure the degree of collimation of the fiber during subsequent filling; filling the fiber into a set of steel ring molds designed to overcome high temperatures, so that the interior of the steel ring molds is filled with fibers; cutting the fibers among steel ring molds, and polishing one side the fiber-filled steel ring molds with a grinding and polishing machine; using a fixture designedto match the outer diameter of the steel ring mold to clamp the steel ring mold and polish the other side, at the same time, the polished side can be kept flat, so as to ensure the parallelism of thefiber sample; and measuring the thermal diffusion coefficient [Alpha]<T> of the sample after the polishing at high temperature. The invention also designs the corresponding winding mold, steel ring molds and matching fixture, which can measure the thermal diffusion coefficient of the fiber at high temperature; the thermal conductivity can be obtained by the calculation through relevant formulas toaccurately reflect the thermal conductivity of the fiber; the heat loss during the measurement of the thermal diffusion coefficient is small; and the dispersibility of the measurement results is small.

Description

technical field [0001] The invention relates to the field of fiber performance testing, in particular to a sample preparation method and device for measuring fiber high-temperature thermal diffusivity. Background technique [0002] With the continuous development of science and technology, a large number of new types of fibers have been developed one after another. How to accurately and comprehensively characterize the thermophysical properties of fibers has very important reference significance for the correct evaluation of the differences between different types of fibers and the reasonable selection of the application range of fibers. [0003] Thermal conductivity, also known as thermal conductivity, is a measure of the thermal conductivity of a substance. It is defined as the heat transferred by a unit temperature gradient through a unit heat transfer surface in a unit time. It is one of the most important thermophysical parameters of solid materials and is often used as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20G01N1/28G01N1/32
CPCG01N1/286G01N1/32G01N25/20
Inventor 王绍凯李敏付昊顾轶卓张佐光
Owner BEIHANG UNIV
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