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Silica sol composite graphite felt as well as preparation method and application thereof

A technology of composite graphite and silica sol, which is applied in the field of graphite felt, can solve the problems of poor oxidation resistance, poor high temperature resistance, and poor heat preservation of viscose-based graphite felt, and achieve the anti-oxidation performance and heat preservation effect of non-powdering and slag removal good, strength-enhancing effect

Pending Publication Date: 2022-05-27
辽宁兴汇碳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned viscose-based graphite felt has poor oxidation resistance and high temperature resistance, and at present, the size of vacuum equipment is getting larger and larger, requiring more and more soft felts. Short service life, poor consistency of temperature difference in the thermal field of vacuum equipment, etc., resulting in high cost of vacuum equipment

Method used

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  • Silica sol composite graphite felt as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A preparation method of silica sol composite graphite felt, comprising the following steps:

[0049] (1) Immerse the viscose-based graphite felt (Liaoning Xinghui Carbon Material Technology Co., Ltd., URGF-GF-TP3 / 2) into modified silica sol (pH 7, made of 3% dodecyltrimethoxysilane) and 97% of the silica sol provided by Hubei Zhenghe Technology Co., Ltd.) for 30 min, using a rolling mill with a line speed of 30 m / min to carry out two-dipping and two-rolling treatment, and the over-rolling ratio was 70% to obtain a modified graphite felt;

[0050] (2) drying the modified graphite felt obtained in step (1) in a drying oven at 180°C for 50 min, cooling to room temperature, and heating the cooled modified graphite felt at a heating rate of 50°C / min for the first time to 600°C, hold the temperature for 30min, heat to 800°C for the second time according to the heating rate of 10°C / min, heat to 1600°C for the third time according to the heating rate of 5°C / min, keep the temper...

Embodiment 2

[0052] A preparation method of silica sol composite graphite felt, comprising the following steps:

[0053] (1) Immerse the viscose-based graphite felt (Liaoning Xinghui Carbon Material Technology Co., Ltd., URGF-GF-TP3 / 2) into a modified silica sol (made of 3% dodecyltrimethoxysilane and 97% Hubei The composition of silica sol provided by Zhenghe Technology Co., Ltd.) was used for 60min in a rolling mill with a line speed of 35m / min to carry out two-dipping and two-rolling treatment, and the residual ratio was 75% to obtain a modified graphite felt;

[0054] (2) drying the modified graphite felt obtained in step (1) in a drying oven at 280° C. for 40 min, cooling to room temperature, and heating the cooled modified graphite felt for the first time according to a heating rate of 60° C. / min to 650°C, hold for 20min, heat to 850°C for the second time according to the heating rate of 12°C / min, heat to 1650°C for the third time according to the heating rate of 6°C / min, hold for 10...

Embodiment 3

[0056] A preparation method of a silica sol composite graphite felt, the difference from Example 1 is that the one-dipping and one-rolling process is used to replace the two-dipping and two-rolling treatment process, and the over-rolling ratio is 70%, and other components, parameters and steps are the same as Example 1 is the same.

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Abstract

The invention provides a silica sol composite graphite felt as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out gum dipping treatment on a viscose-based graphite felt in modified silica sol, and then carrying out passivating treatment, the characteristic that the modified silica sol and cellulose in the viscose-based graphite felt can be subjected to a cross-linking reaction to form a net structure is utilized, so that the internal structure of fibers in the viscose-based graphite felt is changed, and the strength of the finally obtained composite graphite felt is further improved; meanwhile, the modified silica sol can also form a good protective film on the outer surface of the graphite felt, so that the problem of felt body oxidation caused by water separated out of a felt body in the high-temperature passivation treatment process of the graphite felt is avoided, the heat preservation performance of the graphite felt is effectively improved, the service life of the graphite felt is prolonged, and the service life of the graphite felt is prolonged. Finally, the silica sol composite graphite felt with excellent comprehensive performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of graphite felt, and in particular relates to a silica sol composite graphite felt and a preparation method and application thereof. Background technique [0002] In recent years, my country's investment in the field of photovoltaic equipment and vacuum equipment purification has continued to increase, and the furnace size of the single crystal furnace equipment invested has continued to increase. Vacuum equipment is a high-energy-consuming industry that needs to consume a large amount of electricity. The internal thermal insulation effect will directly affect the amount of electricity consumed by the vacuum equipment. The thermal insulation felt with excellent and efficient thermal insulation effect can effectively reduce the heat in the furnace from diffusing to the furnace wall, thereby reducing energy consumption and saving energy, thereby saving production costs and increasing profits [0003] As the m...

Claims

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Application Information

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IPC IPC(8): D06M11/79D06M13/513D06M101/40
CPCD06M11/79D06M13/513D06M2101/40Y02P20/10
Inventor 张晓卉
Owner 辽宁兴汇碳材料科技有限公司
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