Carbon fiber cluster sample preparation device and carbon fiber cluster preparation method

Abstract

The invention discloses a carbon fiber cluster sample preparation device and a carbon fiber cluster preparation method. The device includes a pre-pressing straightening assembly, a restraining ring assembly and a trimming assembly, wherein the pre-pressing straightening assembly is used for pressing and straightening carbon fibers forming a carbon fiber bundle to obtain a cylindrical carbon fiberbundle, the restraining ring assembly includes an upper restraining ring and a lower restraining ring, the upper restraining ring and the lower restraining ring are two semi-rings in the form of snaps, which are butted to form a full circle as a restraining ring for restraining the carbon fiber bundle, the trimming assembly includes a clamping device used for clamping the restraining ring and a cutter used for trimming the clamped carbon fiber bundle. The device is advantaged in that through pre-pressing straightening assembly, smoothness and collimation of a carbon fiber bundle state can be more in line with experimental requirements; through the restraining ring, the carbon fiber bundle sample can be made to acquire accurate volume density and profile dimensions, and the sample preparation device can greatly reduce interference of the sample preparation process of the sample on the experimental result.

Description

technical field [0001] The invention relates to a sample preparation device, in particular to a carbon fiber bundle sample preparation device. Background technique [0002] Carbon fiber is known as one of the materials with the best comprehensive performance in the industry today. It is a new type of carbon material whose chemical composition contains more than 90% of the mass fraction of carbon elements. Carbon fiber and its modified composite materials have been widely used in many fields such as aerospace, machinery manufacturing, textile, chemical industry, civil engineering, medical and health, etc. Both the carbon fiber itself and its composite materials have great practical application value. [0003] Thermal conductivity is one of the important physical parameters for evaluating the thermal properties of carbon fibers. Accurate measurement of the axial thermal conductivity of carbon fibers has important guiding significance for the development, preparation and evalu...

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Problems solved by technology

[0009] At present, carbon fiber cluster sample preparation is mainly manual sample preparation, that is, two people cooperate to use tape to wind carbon fiber into a cylindrical shape, and then use a knife to cut off a section, and use sandpaper to smooth the two ends to make a circular sheet. The internal smoothness of the carbon fiber bundle after manual sample preparation is insufficient, and there are cases of fuzzing and twisting. The compactness of the sample changes with the change of hand strength without a certain rule, which affects the accuracy of the test results.

There are also some literatures and reports on the use of cylindrical holders for carbon fiber bundle sample preparation, but there are also major problems, either the carbon fiber bundles are difficult to penetrate into the cylindrical holder, or the samples made are difficult to measure in terms of dimension accuracy. Meet the standards required by GB / T 22588-2008 and ASTM E1461-2013, the internal smoothness is insufficient, and the filling rate of carbon fiber cannot be accurately determined

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