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Preparation method of hard carbon felt

A technology of hard carbon and short carbon fiber, which is applied in the field of hard carbon felt preparation, which can solve the problems of high cost, low preparation cost, and hazards to environmental operators, and achieve long service life, good heat preservation effect, and uniform density.

Active Publication Date: 2015-01-14
LIAOYUAN YIDA CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation cost of soft carbon (graphite) felt is low, and it can also be used for heat insulation in vacuum furnaces. However, soft carbon felt has the following problems as a heat insulation layer: 1. The production process of the heat insulation layer is cumbersome
Although the preparation of pre-oxidized felt by pre-oxidation treatment of polypropylene fibers can have a high thermal insulation effect, more chemical reagents (such as nitric acid, metal salts, etc.) are used in this process, and the cost of waste liquid treatment is high. The environment and operators will cause certain hazards; the rigid carbon felt prepared by needle-punching chopped carbon fibers into carbon felt preforms can control the density of the preform, and has high strength and hardness. Carbon felt has uneven density and high cost

Method used

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  • Preparation method of hard carbon felt

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preparation example Construction

[0020] see figure 1 , the invention provides a kind of preparation method of hard carbon felt, comprises the following steps:

[0021] 1.1 Prepare short carbon fibers of predetermined length and a binder, and place the short carbon fibers and binder in a solvent to prepare a fiber suspension.

[0022] As an embodiment, the predetermined length of short carbon fibers prepared in the step 1.1 is a single length or different lengths. A dispersant is also added to the fiber suspension to uniformly disperse the short carbon fibers in the solvent. As an example, the dispersant is polyethylene glycol. The binder is a carbon-containing resin including phenolic resin, furfural resin or epoxy resin, so the solvent is water or an organic solvent.

[0023] 1.2 Pour the fiber suspension into a mold of a predetermined shape and apply a predetermined pressure to it to remove the solvent and promote uniform fiber distribution.

[0024] 1.3 Curing and drying the prefabricated body with the...

example 1

[0037] Example 1: Pour chopped fibers (containing binder, fiber length of 5mm, phenolic resin ratio of 5:1) into water solvent, the ratio of fiber to water is 1:20, and the dispersant is polyethylene glycol. Disperse the fibers completely and pour them into a mold of a certain shape. After the solution is completely poured into the mold, cover the mold cover to ensure the uniformity of each part and control the thickness to ensure that the density of the carbon felt is 0.16g / mm 3, After removing the solvent, heat it at 150°C for 5 hours, demould and carbonize it. The carbonization condition is 900°C and heat it for 2 hours. The carbonized hard felt is kept at 2000°C for 1 hour under the protection of argon. heat treatment. High temperature treated carbon felt has a density of 0.158 g / mm 3 , the thermal conductivity is 0.23W / m·K (room temperature), and the plane flexural strength is 1.7MPa.

example 2

[0038] Example 2: Pour chopped fibers (containing binder, fiber lengths of 2mm and 5mm respectively, ratio of 1:1, phenolic resin ratio of 5:1) into the water solvent, the ratio of fiber to water is 1:15 , the dispersant is polyethylene glycol, disperse the fiber completely, pour it into a mold of a certain shape, after the solution is completely poured into the mold, cover the mold cover to ensure the uniformity of each part and control the thickness to ensure that the carbon felt The density is 0.16g / mm 3, After removing the solvent, heat it at 150°C for 5 hours, demould and carbonize it. The carbonization condition is 1000°C and heat it for 2 hours. The carbonized hard felt is kept at 1600°C for 1 hour under the protection of argon. heat treatment. High temperature treated carbon felt has a density of 0.62 g / mm 3 , the thermal conductivity is 0.3W / m·K (room temperature), and the plane flexural strength is 2MPa.

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Abstract

The invention discloses a preparation method of a hard carbon felt, and the method is mainly as follows: short carbon fiber is dispersed in a solvent by a dispersing agent, the dispersed short carbon fiber is poured into a mold of a certain size, the solvent is removed, and the hard carbon felt is obtained by curing demolding, eventual carbonization and high temperature treatment. The hard carbon felt prepared by the method has the following advantages: carbon felt density is low and controllable, heat insulation effect is good; the product is in an overall structure, size can be adjusted according to the specific requirements, and the density is uniform; the service life is long, loss under the conditions of high temperature is low, volatile components and other impurities unfavourable to products are not produced.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature vacuum furnace heat insulation material, in particular to a preparation method of a hard carbon felt. Background technique [0002] In recent years, my country's investment in the field of polysilicon smelting and purification has been increasing, and the size of the furnace of the smelting equipment invested has been increasing. Polysilicon smelting is a high-energy-consuming industry that consumes a lot of electric energy. The thermal insulation effect in the smelting furnace will It directly affects the amount of electric energy consumed by polycrystalline silicon smelting, so the thermal insulation blanket with excellent high-temperature insulation effect can effectively reduce the heat in the furnace from spreading to the furnace wall, reduce energy consumption, save energy, thereby saving smelting costs and improving profits. The preparation cost of soft carbon (graphite) felt is ...

Claims

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Application Information

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IPC IPC(8): C04B32/00C04B35/83
Inventor 曹钺尹朝辉
Owner LIAOYUAN YIDA CARBON
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