Preparation method of silicon carbide coating applied to carbon fiber hard insulation felt

Abstract

The invention discloses a preparation method of a silicon carbide coating applied to a carbon fiber hard insulation felt, which comprises the following steps: blending and stirring molecular resin, silicon carbide powder, a diluent, carbon powder and oxide powder to obtain an oxide-containing silicon carbide coating, polishing the surface of a carbon fiber hard felt material with abrasive paper, washing with nitrogen, and removing dust and residues on the surface, thereby obtaining the carbon fiber hard insulation felt. The surface of the carbon fiber hard felt material is cleaner due to substances such as carbon fiber particles and the like, and then the silicon carbide coating slurry is coated on the surface of the carbon fiber hard felt material, so that the thickness of the blade-coated silicon carbide coating is a certain thickness of 0.2-1mm; and then heating curing, secondary blade coating of the silicon carbide coating, secondary curing of the silicon carbide coating and high-temperature sintering are performed to form a final thermal insulation layer of the carbon fiber hard thermal insulation felt, so that the strength, the wear resistance and the oxidation resistance of the carbon fiber thermal insulation felt are improved, and the service life of the carbon fiber thermal insulation material is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of a method for preparing a silicon carbide coating of a carbon fiber rigid thermal insulation felt, and in particular to a method for preparing a silicon carbide coating applied to a carbon fiber rigid thermal insulation felt. Background Art

[0002] Carbon fiber rigid insulation felt is a carbon fiber insulation material that has been widely used in many fields. In recent years, the demand for carbon fiber insulation materials in the photovoltaic industry and the semiconductor industry has been increasing, and higher requirements have been placed on the strength, wear resistance, oxidation resistance, and thermal conductivity of carbon fiber insulation materials.

[0003] In the industrial production process, most high-temperature furnaces (such as single crystal silicon growth furnaces, atmosphere sintering furnaces, etc.) mostly use inert gas for furnace temperature cooling, and the granular matter in the high-temperature furnace will wash the surface of the insulation material with the airflow, causing the carbon fiber insulation felt to be washed by the high-speed particle flow, thereby causing a lot of wear on the surface of the carbon fiber felt; in addition, there is a large amount of silicon vapor in the single crystal silicon growth furnace, which will react with the carbon fiber at high temperature, gradually corroding the carbon fiber insulation felt, which will seriously reduce the service life of the carbon fiber insulation material. Most of the current solutions are to stick a layer of graphite paper on the surface of the carbon fiber insulation material to prevent silicon vapor from diffusing into the carbon felt. However, the bonding strength between graphite paper and carbon fiber insulation material is usually relatively low, and after repeated heating and cooling cycles, the graphite paper is prone to damage and falling off. After long-term use, it will cause powdering and slag to appear, polluting the samples in the furnace, resulting in a low service life of the carbon fiber insulation material. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or the problems existing in an existing method for preparing a silicon carbide coating applied to carbon fiber hard insulation felt, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a method for preparing a silicon carbide coating applied to a carbon fiber hard insulation felt. First, a silicon carbide coating slurry is prepared, and then the surface of the carbon fiber hard felt material is polished with sandpaper, and then flushed with nitrogen to remove surface dust, residues, particles and other substances, so that the surface of the carbon fiber hard felt material is cleaner, and then the silicon carbide coating slurry is applied to the surface of the carbon fiber hard felt material. After heating and curing, secondary scraping of the silicon carbide coating, secondary curing of the silicon carbide coating and high-temperature sintering, the final carbon fiber hard insulation felt insulation layer is formed, thereby improving the strength, wear resistance, and oxidation resistance of the carbon fiber insulation felt, and increasing the service life of the carbon fiber insulation material.

[0007] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A method for preparing a silicon carbide coating applied to carbon fiber hard thermal insulation felt, comprising:

[0009] S1: preparing silicon carbide coating slurry: the silicon carbide coating slurry comprises the following parts by weight: 1-3 parts of polymer resin, 2-4 parts of silicon carbide powder, 2-4 parts of diluent, 2-4 parts of carbon powder, and 1-5% of oxide powder to silicon carbide powder. The above components are blended and stirred to obtain a silicon carbide coating containing oxide;

[0010] S2 Pre-treat the carbon fiber hard felt material to remove dust and other impurities: Grind the surface of the carbon fiber hard felt material with sandpaper, and then flush it with nitrogen to remove dust, residues, particles and other substances on the surface;

[0011] S3: scraping the silicon carbide coating: using a scraper to scrape the silicon carbide coating material prepared in S1 on the surface of the carbon fiber hard felt material in S2 to a suitable thickness;

[0012] S4: curing the silicon carbide coating: placing the carbon fiber hard felt processed in S3 into an oven for curing; the curing conditions are: a heating rate of 5-10°C / min, and a constant temperature of 100-300°C for 1-4h;

[0013] S5: secondary scraping and coating of silicon carbide coating: the carbon fiber hard felt material treated in S4 is scraped and coated with silicon carbide coating material again; the thickness of the secondary scraping and coating of silicon carbide coating material is consistent with that in S3;

[0014] S6 secondary curing of silicon carbide coating: the carbon fiber hard felt material treated in S5 is put into the oven again for curing; the secondary curing conditions are the same as those in S4;

[0015] S7 high temperature sintering to form a thermal insulation layer: the carbon fiber hard felt material processed in S6 is sintered at high temperature to finally form a coating; the high temperature sintering condition is sintering at a temperature of 1800-2300°C at a heating rate of 1-5°C / min under argon, nitrogen or vacuum conditions.

[0016] As a preferred embodiment of the method for preparing a silicon carbide coating for carbon fiber rigid thermal insulation felt described in the present invention, the polymer resin is at least one of amino resin, phenolic resin, acrylic resin, epoxy resin, alkyd resin, acetate resin, and ketone-amine resin.

[0017] As a preferred embodiment of the method for preparing a silicon carbide coating for carbon fiber rigid thermal insulation felt described in the present invention, the silicon carbide powder is at least one of 100 mesh, 300 mesh, 500 mesh, and 800 mesh; and the diluent is at least one of alcohol, acetone, and methanol.

[0018] As a preferred embodiment of the method for preparing a silicon carbide coating for carbon fiber hard insulation felt described in the present invention, the carbon powder is at least one of 200 mesh, 400 mesh, 800 mesh, 1500 mesh, and 2000 mesh.

[0019] As a preferred embodiment of the method for preparing a silicon carbide coating applied to carbon fiber hard thermal insulation felt described in the present invention, the oxide is at least one of zirconium oxide, calcium oxide and aluminum oxide.

[0020] As a preferred embodiment of the method for preparing a silicon carbide coating for carbon fiber hard thermal insulation felt described in the present invention, the sandpaper used in S2 is selected from at least one of 80 mesh, 100 mesh, 200 mesh, 300 mesh, and 400 mesh.

[0021] As a preferred embodiment of the method for preparing a silicon carbide coating for carbon fiber rigid thermal insulation felt described in the present invention, in the S3 scraping silicon carbide coating, the suitable thickness is a thickness between 0.2-1 mm.

[0022] Compared with the prior art, the present invention has the following beneficial effects: firstly, the silicon carbide coating slurry is prepared, then the surface of the carbon fiber hard felt material is polished with sandpaper, and then flushed with nitrogen to remove dust, residues, particles and other substances on the surface, so that the surface of the carbon fiber hard felt material is cleaner, and then the silicon carbide coating slurry is applied on the surface of the carbon fiber hard felt material, and the final carbon fiber hard insulation felt insulation layer is formed through heating and curing, secondary scraping of the silicon carbide coating, secondary curing of the silicon carbide coating and high-temperature sintering, thereby improving the strength, wear resistance and oxidation resistance of the carbon fiber insulation felt and increasing the service life of the carbon fiber insulation material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0024] Figure 1 This is a method diagram of a method for preparing a silicon carbide coating applied to carbon fiber hard insulation felt according to the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] The present invention provides a method for preparing a silicon carbide coating applied to a carbon fiber hard insulation felt, first preparing a silicon carbide coating slurry, then grinding the surface of the carbon fiber hard felt material with sandpaper, and then flushing with nitrogen to remove dust, residues, particles and other substances on the surface, so that the surface of the carbon fiber hard felt material is cleaner, and then applying the silicon carbide coating slurry on the surface of the carbon fiber hard felt material, and then heating and curing, secondary scraping of the silicon carbide coating, secondary curing of the silicon carbide coating and high-temperature sintering to form the final insulation layer of the carbon fiber hard insulation felt, thereby improving the strength, wear resistance and oxidation resistance of the carbon fiber insulation felt and increasing the service life of the carbon fiber insulation material. .

[0029] Figure 1 The figure shows the overall structure of a method for preparing a silicon carbide coating applied to a carbon fiber hard insulation felt according to an embodiment of the present invention. Figure 1 , a method for preparing a silicon carbide coating applied to a carbon fiber hard insulation felt in this embodiment, the main part of which includes:

[0030] S1: preparing silicon carbide coating slurry: the silicon carbide coating slurry comprises the following parts by weight: 1-3 parts of polymer resin, 2-4 parts of silicon carbide powder, 2-4 parts of diluent, 2-4 parts of carbon powder, and 1-5% of oxide powder to silicon carbide powder. The above components are blended and stirred to obtain a silicon carbide coating containing oxide;

[0031] The polymer resin is at least one of amino resin, phenolic resin, acrylic resin, epoxy resin, alkyd resin, acetate resin and ketone-amine resin; the silicon carbide powder is at least one of 100 mesh, 300 mesh, 500 mesh and 800 mesh; the diluent is at least one of alcohol, acetone and methanol; the carbon powder is at least one of 200 mesh, 400 mesh, 800 mesh, 1500 mesh and 2000 mesh; the oxide is at least one of zirconium oxide, calcium oxide and aluminum oxide;

[0032] S2 pre-treats the carbon fiber hard felt material to remove dust and other impurities: the surface of the carbon fiber hard felt material is polished with sandpaper, and then flushed with nitrogen to remove dust, residues, particles and other substances on the surface; the sandpaper is selected from at least one of 80 mesh, 100 mesh, 200 mesh, 300 mesh and 400 mesh;

[0033] S3: Scrape the silicon carbide coating: Scrape the silicon carbide coating material prepared in S1 on the surface of the carbon fiber hard felt material in S2 with a scraper to a suitable thickness; the suitable thickness is a thickness between 0.2 and 1 mm;

[0034] S4: Curing the silicon carbide coating: Put the carbon fiber hard felt treated in S3 into an oven for curing; the curing conditions are: a heating rate of 5-10℃ / min, and a constant temperature of 100-300℃ for 1-4h;

[0035] S5: Secondary scraping of silicon carbide coating: The carbon fiber hard felt material processed in S4 is scraped again with silicon carbide coating material; the thickness of the secondary scraping of silicon carbide coating material is consistent with that of S3;

[0036] S6 secondary curing of silicon carbide coating: the carbon fiber hard felt material treated in S5 is put into the oven again for curing; the secondary curing conditions are the same as those in S4;

[0037] S7 high temperature sintering to form a thermal insulation layer: the carbon fiber hard felt material processed in S6 is sintered at a high temperature to finally form a coating; the high temperature sintering condition is sintering at a temperature of 1800-2300°C at a heating rate of 1-5°C / min under argon, nitrogen or vacuum conditions;

[0038] Combination Figure 1, a method for preparing a silicon carbide coating applied to a carbon fiber hard insulation felt in this embodiment, and the specific use process is as follows: first, molecular resin, silicon carbide powder, diluent, carbon powder, and oxide powder are mixed and stirred to obtain a silicon carbide coating containing oxide, and then the surface of the carbon fiber hard felt material is polished with sandpaper, and then flushed with nitrogen to remove surface dust, residues, particles and other substances, so that the surface of the carbon fiber hard felt material is cleaner, and then the silicon carbide coating slurry is applied on the surface of the carbon fiber hard felt material, and after heating and curing, secondary scraping of the silicon carbide coating, secondary curing of the silicon carbide coating and high-temperature sintering, the final carbon fiber hard insulation felt insulation layer is formed, thereby improving the strength, wear resistance, and oxidation resistance of the carbon fiber insulation felt, and increasing the service life of the carbon fiber thermal insulation material.

[0039] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for preparing a silicon carbide coating for carbon fiber hard insulation felt, characterized in that: include: S1: preparing silicon carbide coating slurry: the silicon carbide coating slurry comprises the following parts by weight: 1-3 parts of polymer resin, 2-4 parts of silicon carbide powder, 2-4 parts of diluent, 2-4 parts of carbon powder, and 1-5% of oxide powder to silicon carbide powder. The above components are blended and stirred to obtain a silicon carbide coating containing oxide; S2 Pre-treat the carbon fiber hard felt material to remove dust and other impurities: Grind the surface of the carbon fiber hard felt material with sandpaper, and then flush it with nitrogen to remove dust, residues, particles and other substances on the surface; S3: scraping the silicon carbide coating: using a scraper to scrape the silicon carbide coating material prepared in S1 on the surface of the carbon fiber hard felt material in S2 to a suitable thickness; S4: curing the silicon carbide coating: placing the carbon fiber hard felt processed in S3 into an oven for curing; the curing conditions are: a heating rate of 5-10°C / min, and a constant temperature of 100-300°C for 1-4h; S5: secondary scraping and coating of silicon carbide coating: the carbon fiber hard felt material treated in S4 is scraped and coated with silicon carbide coating material again; the thickness of the secondary scraping and coating of silicon carbide coating material is consistent with that in S3; S6 secondary curing of silicon carbide coating: the carbon fiber hard felt material treated in S5 is put into the oven again for curing; the secondary curing conditions are the same as those in S4; S7 high temperature sintering to form a thermal insulation layer: the carbon fiber hard felt material processed in S6 is sintered at a high temperature to finally form a coating; The high temperature sintering condition is to sinter at a temperature of 1800-2300° C. at a heating rate of 1-5° C. / min under argon, nitrogen or vacuum conditions.

2. The method for preparing a silicon carbide coating for carbon fiber hard thermal insulation felt according to claim 1, characterized in that: The polymer resin is at least one of amino resin, phenolic resin, acrylic resin, epoxy resin, alkyd resin, acetate resin and ketone-amine resin.

3. The method for preparing a silicon carbide coating for carbon fiber hard thermal insulation felt according to claim 1, characterized in that: The silicon carbide powder is at least one of 100 mesh, 300 mesh, 500 mesh and 800 mesh; the diluent is at least one of alcohol, acetone and methanol.

4. The method for preparing a silicon carbide coating for carbon fiber hard thermal insulation felt according to claim 1, characterized in that: The carbon powder is at least one of 200 mesh, 400 mesh, 800 mesh, 1500 mesh and 2000 mesh.

5. The method for preparing a silicon carbide coating for carbon fiber hard thermal insulation felt according to claim 1, characterized in that: The oxide is at least one of zirconium oxide, calcium oxide and aluminum oxide.

6. The method for preparing a silicon carbide coating for carbon fiber hard thermal insulation felt according to claim 1, characterized in that: The sandpaper used in S2 is selected from at least one of 80 mesh, 100 mesh, 200 mesh, 300 mesh, and 400 mesh.

7. The method for preparing a silicon carbide coating for carbon fiber hard thermal insulation felt according to claim 1, characterized in that: In the S3 scraped silicon carbide coating, the suitable thickness is a thickness between 0.2 and 1 mm.

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