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A kind of preparation method of silicon carbide coating on the surface of hard carbon fiber felt

A technology of silicon carbide and silicon carbide coating on the surface, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of high cost, complicated process, high overall density and thermal conductivity of hard carbon fiber felt, and achieve production Low cost, simple process, and the effect of reducing the degree of thermal mismatch

Active Publication Date: 2016-05-11
GAOYOU INST CO LTD DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating made by chemical vapor deposition is tightly combined with the substrate, the sintering quality is high, the coating is dense, and it can meet the requirements of preparing coatings for complex-sized samples, but the cost is high, and the overall density of the hard carbon fiber mat prepared by this method is and thermal conductivity are large, and the process is complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for a silicon carbide coating on the surface of a hard carbon fiber felt, comprising the following steps:

[0025] (1) Pre-processing:

[0026] Grinding and polishing the surface of the hard carbon fiber felt substrate, using sandpaper for grinding and polishing is 200#, ultrasonic cleaning is carried out in absolute ethanol, the cleaning time is 30 minutes, and drying after ultrasonic cleaning;

[0027] (2) prepare transition graphite layer:

[0028] The surface of the hard carbon fiber felt substrate treated in step (1) is uniformly coated with graphite milk, and the graphite milk is in a milky state with a concentration of 1.0g / cm 3 , whose main components are graphite powder, dispersant and cellulose, after natural drying at room temperature, and then placed in a drying oven at 80 ° C for 12 hours. Then it is placed in a vacuum carbon tube furnace, and after carbonization and graphitization, a transitional graphite layer is formed on the surfa...

Embodiment 2

[0032] A preparation method for a silicon carbide coating on the surface of a hard carbon fiber felt, comprising the following steps:

[0033] (1) Pre-processing:

[0034] Grinding and polishing the surface of the hard carbon fiber felt base body, using sandpaper for grinding and polishing is 500#, ultrasonic cleaning is carried out with absolute ethanol, and the cleaning time is 40 minutes, and drying after ultrasonic cleaning;

[0035] (2) prepare transition graphite layer:

[0036] The surface of the hard carbon fiber felt substrate after step (1) is evenly coated with graphite milk, and the graphite milk is in a milky state with a concentration of 1.4g / cm 3 , its main components are graphite powder, dispersant and cellulose, after natural drying at room temperature, then placed in a drying oven at 120 ° C for 8 hours, then placed in a vacuum carbon tube furnace, after carbonization treatment and graphite After chemical treatment, a transitional graphite layer is formed o...

Embodiment 3

[0040] A preparation method for a silicon carbide coating on the surface of a hard carbon fiber felt, comprising the following steps:

[0041] (1) Pre-processing:

[0042] Grinding and polishing the surface of the hard carbon fiber felt base body, using sandpaper for grinding and polishing is 300#, ultrasonic cleaning is carried out with absolute ethanol, and the cleaning time is 35 minutes, and drying after ultrasonic cleaning;

[0043] (2) prepare transition graphite layer:

[0044] The surface of the hard carbon fiber felt substrate treated in step (1) is evenly coated with graphite milk, and the graphite milk is in a milky state with a concentration of 1.2g / cm 3 , its main components are graphite powder, dispersant and cellulose, after natural drying at room temperature, then placed in a drying oven at 100 ° C for 10 hours, then placed in a vacuum carbon tube furnace, after carbonization and graphite After chemical treatment, a transitional graphite layer is formed on the ...

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Abstract

The invention belongs to the technical field of heat insulation materials, and especially relates to a preparation method of a silicon carbide coating. The preparation method of the silicon carbide coating on surface of a hard carbon fiber felt comprises the following steps: polishing the surface of a hard carbon fiber felt substrate, carrying out ultrasonic cleaning, and drying; uniformly coating the surface of the processed substrate with aquadag, drying, putting dried substrate in a vacuum carbon tube furnace, and carrying out carbonizing and graphitizing treatment to form a transition graphite layer on the surface of the substrate; putting a graphite crucible in the vacuum carbon tube furnace, adding silicon powder to the graphite crucible, arranging the processed substrate over the graphite crucible, and heating for fusing the silicon powder to carry out silicon thermal evaporation in order to generate the silicon carbide coating on the surface of the hard carbon fiber felt substrate. The thin graphite layer prepared in the invention improves the strength of the coating covering the surface of the substrate, and the SiC coating prepared based on the thin graphite layer effectively improves the combining strength between the coating and the substrate, and has the advantages of simple process, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of heat insulating materials, and in particular relates to a method for preparing a silicon carbide coating. Background technique [0002] Rigid carbon fiber felt is one of the advanced thermal structural materials that can be used in high-temperature environments. It has the characteristics of low density, high stability, ablation resistance, corrosion resistance, and excellent high-temperature mechanical properties. At the same time, there are a large number of micropores inside. It has outstanding high-temperature heat insulation performance, so it is widely used in aerospace, aviation and high-temperature industrial furnace heat insulation materials. However, some high-temperature industrial equipment (such as metal heat treatment furnaces, single crystal growth furnaces) mostly use inert gas for gas cooling, in which particulate matter is mixed in the gas to form a high-speed particle flow, which erodes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/77D06M11/74D06M101/40
Inventor 谭毅施伟王兵李强李佳艳
Owner GAOYOU INST CO LTD DALIAN UNIV OF TECH
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