CN110550962A - Coating for repairing cured carbon felt and application thereof - Google Patents

Coating for repairing cured carbon felt and application thereof Download PDF

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Publication number
CN110550962A
CN110550962A CN201910856538.5A CN201910856538A CN110550962A CN 110550962 A CN110550962 A CN 110550962A CN 201910856538 A CN201910856538 A CN 201910856538A CN 110550962 A CN110550962 A CN 110550962A
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carbon felt
cured carbon
coating
fabric
cured
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宋立臣
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Hunan Bocheng New Material Technology Co Ltd
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Hunan Bocheng New Material Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
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    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
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    • C04B35/83—Carbon fibres in a carbon matrix
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    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/02—Homopolymers or copolymers of unsaturated alcohols
    • C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
    • C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
    • C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/16—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers in which all the silicon atoms are connected by linkages other than oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5216—Inorganic
    • C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K2201/011—Nanostructured additives
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract

the coating for repairing the cured carbon felt comprises a primer and a fabric, wherein the primer comprises the following components: adhesives, thermal expansion buffers and reinforcing agents; the fabric comprises the following components: a binder, a reinforcing agent and a dispersant. The invention also comprises the application of the repair coating. The repair coating can restore the use function of the cured carbon felt which is partially failed, greatly prolongs the service life of the cured carbon felt product and reduces the use cost of the cured carbon felt.

Description

coating for repairing cured carbon felt and application thereof
Technical Field
The invention relates to a coating, in particular to a coating for repairing a cured carbon felt and application thereof.
Background
The solidified carbon felt is obtained by using a carbon fiber soft felt or a graphite felt as a base material and carrying out processes of blanking, blank making, solidification, carbonization, high-temperature treatment, machining, coating and the like.
The cured carbon felt has the characteristics of low density, low heat conductivity coefficient, good heat preservation performance, high temperature resistance, good thermal shock resistance, good shape retentivity, certain strength and the like, is convenient to install, disassemble and replace, has long service life, can reach the use temperature of 3000 ℃, and is an ideal novel heat insulation material for high-temperature vacuum equipment and non-oxidation atmosphere high-temperature equipment. The solidified carbon felt is suitable for various furnace types such as a vacuum high-pressure gas quenching furnace, a vacuum sintering furnace, a pressurizing vacuum sintering furnace, a monocrystalline silicon furnace, a polycrystalline silicon furnace, a silicon carbide crystal growth furnace and the like.
However, in the actual use process, due to the fact that the vacuum degree of the vacuum furnace is insufficient, gas corrosion and other factors affect, after the solidified carbon felt is used for a period of time, phenomena such as local oxidation, pulverization, felt falling and the like are avoided, the heat preservation performance of the solidified carbon felt is reduced to be incapable of being used normally, and adverse effects are caused to normal production.
currently, factories typically discard partially failed cured carbon felt parts and replace them with entirely new cured carbon felt parts. On the one hand, the price of a completely new cured carbon felt part is relatively expensive, which increases the production cost of the plant; on the other hand, the direct discarding of the failed cured carbon felt component is also a waste of carbon fiber resources, and simultaneously, the subsequent environmental-friendly treatment cost is increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the coating for repairing the cured carbon felt is used for repairing the failed cured carbon felt, so that the using function of the failed cured carbon felt can be recovered, and the using cost of the cured carbon felt is reduced.
the technical scheme adopted by the invention for solving the technical problems is as follows: the coating for repairing the cured carbon felt comprises a primer and a fabric, wherein the primer comprises the following components: adhesives, thermal expansion buffers and reinforcing agents; the fabric comprises the following components: a binder, a reinforcing agent and a dispersant.
Further, the bottom material comprises the following components in percentage by weight: 40% -64% of adhesive, 35% -50% of thermal expansion buffering agent and 1% -10% of reinforcing agent;
further, the fabric comprises the following components in percentage by weight: 45-64% of adhesive, 35-45% of reinforcing agent and 1-10% of dispersing agent.
Further, the adhesive in the primer is at least one of water-based phenolic resin, polyvinyl alcohol and acrylic resin; the thermal expansion buffering agent in the bottom material is at least one of 2000-mesh graphite powder, 1000-mesh graphite powder and graphite milk; the reinforcing agent in the bottom material is 2000-mesh silicon carbide powder and/or 2000-mesh silicon nitride powder.
Further, the adhesive in the fabric is at least one of liquid polycarbosilane, organic polynitrosilane and perhydropolysilazane; the reinforcing agent in the fabric is at least one of 2000-mesh silicon powder, 1000-mesh silicon carbide powder, 2000-mesh silicon carbide powder and 2000-mesh silicon nitride powder; the dispersing agent in the fabric is at least one of white carbon black, 10-200 nm silicon nitride powder and 10-200 nm silicon carbide powder.
the preparation method comprises the following steps: and (3) mixing the raw material components of the base material and the plus material, and fully stirring by using a stirrer for not less than 30 minutes until the base material and the plus material are uniformly dispersed, fine and free of granular feeling, wherein the environmental temperature cannot be higher than 25 ℃ during preparation. If not used immediately, it is stored in a cool place (temperature below 20 deg.C for long-term storage).
The condition of the base material and the surface material which are stored for a period of time needs to be checked, and the base material and the surface material are stirred for 10 minutes; if agglomeration, delamination, hardening, etc. are found, it cannot be used.
repairing the cured carbon felt by using the coating for repairing the cured carbon felt, comprising the following steps of:
(1) and (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) Coating a backing material: uniformly brushing the surface of the cured carbon felt treated in the step (1) with a primer of the coating for repairing the cured carbon felt;
(3) Curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, curing the backing material at the curing temperature of 200-260 ℃, and preserving heat for 2-4 h; cooling to below 100 deg.C, taking out, and cooling to normal temperature;
(4) Brushing the fabric for the first time: uniformly brushing the surface of the cured carbon felt treated in the step (3) with the fabric of the coating for repairing the cured carbon felt;
(5) First ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (4), wherein the ceramic treatment temperature is 900-1200 ℃, and keeping the temperature for 2-4 h; cooling to below 300 ℃ along with the furnace, discharging, and cooling to normal temperature;
(6) brushing the secondary fabric: uniformly brushing the surface of the cured carbon felt treated in the step (5) with the shell fabric of the coating for repairing the cured carbon felt again;
(7) Secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment is performed at the temperature of 900 ℃ and 1600 ℃, and preserving heat for 2-4 h; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature; namely, the finished product is obtained after the repair is finished.
further, in the step (2), the coating amount of the primer is 800-1000g/m 2.
Further, in the step (4), the brushing amount of the fabric is 600-800g/m 2.
further, in the step (6), the brushing amount of the facing material is 200-400g/m 2.
Compared with the prior art, the invention has the following beneficial effects:
the coating of the invention is used for repairing the cured carbon felt which is out of service, so that the cured carbon felt can recover the use function, the service life of the cured carbon felt product is greatly prolonged, and the use cost of the cured carbon felt is reduced.
Detailed Description
the present invention will be described in further detail with reference to examples.
The starting materials used in the examples were, unless otherwise specified, obtained by conventional commercial routes.
Example 1
The coating for repairing the cured carbon felt comprises a bottom material and a surface material;
the base material comprises the following components in percentage by weight: 60% of adhesive (water-based phenolic resin), 35% of thermal expansion buffering agent (5% of 2000-mesh graphite powder, 30% of graphite emulsion) and 5% of reinforcing agent (2000-mesh silicon carbide powder);
the fabric comprises the following components in percentage by weight: 60% of adhesive (liquid polycarbosilane), 36% of reinforcing agent (30% of 2000-mesh silicon carbide powder and 6% of 2000-mesh silicon powder) and 4% of dispersing agent (1% of white carbon black and 3% of 100-nano silicon carbide powder).
after mixing the components, fully stirring the components by using a stirrer for 30 minutes, wherein the bottom material and the face material are uniformly dispersed, fine and free of granular feeling, and the environment temperature is 20 ℃ during preparation.
The coating of the embodiment is used for repairing the cured carbon felt (phi 904 multiplied by phi 744 multiplied by 255 mm) of the upper heat-preservation cylinder of the monocrystalline silicon furnace (the inner wall of the cured carbon felt of the upper heat-preservation cylinder is oxidized and falls off by about 15 percent and is abandoned by manufacturers), and the coating comprises the following steps:
(1) And (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) coating the primer, namely uniformly coating the primer of the coating of the embodiment on the surface of the cured carbon felt treated in the step (1), wherein the coating amount is 900g/m 2;
(3) Curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, wherein the curing temperature is 230 ℃, and preserving heat for 3 hours; cooling to below 100 deg.C, taking out, and cooling to normal temperature;
(4) brushing the fabric for the first time, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (3), wherein the brushing amount is 700g/m 2;
(5) First ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (4), wherein the ceramic treatment temperature is 1050 ℃, and keeping the temperature for 3 h; cooling to below 300 ℃ along with the furnace, discharging, and cooling to normal temperature;
(6) Secondary fabric brushing, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (5) again, wherein the brushing amount is 300g/m 2;
(7) Secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment temperature is 1350 ℃, and preserving heat for 3 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to normal temperature; namely, the finished product is obtained after the repair is finished.
The repaired upper heat-preservation cylinder solidified carbon felt is continuously used in a monocrystalline silicon furnace, no pulverization, no cutting, no slag falling and strength can reach the state of a new product in the using process, the service life of the repaired product is slightly longer than that of the new product, the service life of the repaired product is 208 heats, and the service life of the new product is 200 heats; the service life of the product is prolonged by about one time, and the use cost of the cured carbon felt is greatly reduced.
example 2
the coating for repairing the cured carbon felt comprises a backing material and a surface material,
the base material comprises the following components in percentage by weight: 64% of adhesive (5% polyvinyl alcohol), 35% of thermal expansion buffering agent (graphite emulsion) and 1% of reinforcing agent (2000-mesh silicon nitride powder);
the fabric comprises the following components in percentage by weight: 45% of adhesive (organic polysilazane), 45% of reinforcing agent (wherein the silicon nitride powder with 2000 meshes is 20% and the silicon powder with 2000 meshes is 25%), and 10% of dispersing agent (wherein the silicon nitride powder with 10 nanometers is 5% and the silicon carbide powder with 10 nanometers is 5%).
after the components are mixed, a stirrer is used for fully stirring for 35 minutes, the base material and the surface material are uniformly dispersed, fine and free of granular feeling, and the environment temperature is 25 ℃ during preparation.
The coating of the embodiment is used for repairing a heat preservation cylinder solidified carbon felt (phi 904 x phi 744 x 554 mm) in a monocrystalline silicon furnace (the inner wall of the heat preservation cylinder solidified carbon felt is oxidized and falls off by about 25%, and the manufacturer abandons the heat preservation cylinder solidified carbon felt), and the coating comprises the following operation steps:
(1) And (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) Coating the primer, namely uniformly coating the primer of the coating of the embodiment on the surface of the cured carbon felt treated in the step (1), wherein the coating amount is 1000g/m 2;
(3) curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, wherein the curing temperature is 260 ℃, and preserving heat for 2 hours; cooling to below 100 deg.C, taking out, and cooling to room temperature;
(4) brushing the fabric for the first time, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (3), wherein the brushing amount is 600g/m 2;
(5) First ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (5), wherein the ceramic treatment temperature is 900 ℃, and preserving heat for 4 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature;
(6) secondary fabric brushing, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (6) again, wherein the brushing amount is 400g/m 2;
(7) Secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment temperature is 1600 ℃, and keeping the temperature for 2 h; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature; namely, the finished product is obtained after the repair is finished.
The repaired medium-temperature cylinder solidified carbon felt is continuously used in a monocrystalline silicon furnace, no pulverization, no cutting, no slag falling and strength can reach the state of a new product in the using process, the service life is slightly longer than that of the new product, the service life of the repaired product is 215 heats, and the service life of the new product is 200 heats; the service life of the product is prolonged by about one time, and the use cost of the cured carbon felt is greatly reduced.
example 3
The coating for repairing the cured carbon felt comprises a backing material and a surface material,
The base material comprises the following components in percentage by weight: 40% of adhesive (acrylic resin), 50% of thermal expansion buffering agent (10% of 1000-mesh graphite powder and 40% of graphite emulsion) and 10% of reinforcing agent (6% of 2000-mesh silicon carbide powder and 4% of 2000-mesh silicon nitride powder);
The fabric comprises the following components in percentage by weight: 64 percent of adhesive (perhydropolysilazane), 35 percent of reinforcing agent (10 percent of 2000-mesh silicon powder and 25 percent of 1000-mesh silicon carbide powder) and 1 percent of dispersing agent (200-nanometer silicon nitride powder).
after the components are mixed, a stirrer is used for fully stirring for 40 minutes, the base material and the fabric are uniformly dispersed, fine and free of granular feeling, and the environment temperature is 22 ℃ during preparation.
the repair coating of the embodiment is used for repairing a solidified carbon felt (phi 1030 mm multiplied by phi 806 mm multiplied by 228 mm) of a lower heat preservation cylinder of a monocrystalline silicon furnace (the inner wall of the solidified carbon felt of the lower heat preservation cylinder is oxidized and falls off by about 20 percent and is abandoned by manufacturers), and comprises the following steps:
(1) and (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) Coating the primer, namely uniformly coating the primer of the coating of the embodiment on the surface of the cured carbon felt treated in the step (1), wherein the coating amount of the primer is 800g/m 2;
(3) curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, wherein the curing temperature is 200 ℃, and preserving heat for 4 hours; cooling to below 100 deg.C, taking out, and cooling to room temperature;
(4) uniformly brushing the surface fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (3), wherein the brushing amount of the surface fabric is 800g/m 2;
(5) first ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (4), wherein the ceramic treatment temperature is 1200 ℃, and keeping the temperature for 2 h; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature;
(6) secondary fabric brushing, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (5) again, wherein the brushing amount of the fabric is 200g/m 2;
(7) secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment temperature is 900 ℃, and preserving heat for 4 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature; namely, the finished product is obtained after the repair is finished.
The repaired lower heat-preservation cylinder solidified carbon felt is continuously used in a monocrystalline silicon furnace, no pulverization, no cutting, no slag falling and strength can reach the state of a new product in the using process, the service life is approximately equal to that of the new product, the service life of the repaired product is 195 heats, and the service life of the new product is 200 heats; the service life of the product is prolonged by about one time, and the use cost of the cured carbon felt is greatly reduced.
Example 4
The coating for repairing the cured carbon felt comprises a backing material and a surface material,
The base material comprises the following components in percentage by weight: 55% of adhesive (wherein the water-based phenolic resin is 35%, and the polyvinyl alcohol with the concentration of 5% is 20%), 40% of thermal expansion buffer (graphite emulsion), and 5% of reinforcing agent (2000-mesh silicon nitride powder);
The fabric comprises the following components in percentage by weight: 60% of adhesive (30% of organic polynitrosilane and 30% of perhydropolysilazane), 36% of reinforcing agent (30% of 2000-mesh silicon nitride powder and 6% of 2000-mesh silicon nitride powder) and 4% of dispersing agent (1% of white carbon black and 3% of 100-nano silicon nitride powder).
After mixing the components, fully stirring the components by using a stirrer for 30 minutes, wherein the bottom material and the face material are uniformly dispersed, fine and free of granular feeling, and the environment temperature is 20 ℃ during preparation.
The repair coating of the embodiment is used for repairing a solidified carbon felt (phi 1030 multiplied by phi 180 multiplied by 120 mm) of a monocrystalline silicon furnace bottom insulation board (the upper surface of the solidified carbon felt of the bottom insulation board is oxidized and falls off by about 30%, and manufacturers discard the carbon felt), and comprises the following steps:
(1) and (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) Coating the primer, namely uniformly coating the primer of the coating of the embodiment on the surface of the cured carbon felt treated in the step (1), wherein the coating amount of the primer is 950g/m 2;
(3) Curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, wherein the curing temperature is 240 ℃, and the heat preservation time is 3.5 hours; cooling to below 100 deg.C, taking out, and cooling to room temperature;
(4) brushing the fabric for the first time, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (3), wherein the brushing amount of the fabric is 750g/m 2;
(5) first ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (4), wherein the ceramic treatment temperature is 1100 ℃, and preserving heat for 2.5 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature;
(6) secondary fabric brushing, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (5) again, wherein the brushing amount of the fabric is 350g/m 2;
(7) secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment temperature is 1550 ℃, and keeping the temperature for 2.5 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature; namely, the finished product is obtained after the repair is finished.
the repaired bottom insulation board solidified carbon felt is continuously used in a monocrystalline silicon furnace, no pulverization, no cutting, no slag falling and strength can reach the state of a new product in the using process, the service life of the repaired product is slightly longer than that of the new product, the service life of the repaired product is 210 heats, and the service life of the new product is 200 heats; the service life of the product is prolonged by about one time, and the use cost of the cured carbon felt is greatly reduced.
example 5
the coating for repairing the cured carbon felt comprises a backing material and a surface material,
the base material comprises the following components in percentage by weight: 48% of adhesive (wherein the content of the aqueous phenolic resin is 15%, 25% of polyvinyl alcohol with the concentration of 5%, 8% of acrylic resin), 45% of thermal expansion buffering agent (wherein the content of 2000-mesh graphite powder is 5%, 10% of 1000-mesh graphite powder is 10%, 30% of graphite emulsion), 7% of reinforcing agent (wherein the content of 2000-mesh silicon carbide powder is 2%, and the content of 2000-mesh silicon nitride powder is 5%);
The fabric comprises the following components in percentage by weight: 55% of adhesive (wherein the liquid polycarbosilane is 5%, 20% of organic polynitrosilane and 30% of perhydropolysilazane), 40% of reinforcing agent (wherein the 2000-mesh silicon powder is 5%, the 1000-mesh silicon carbide powder is 5%, the 2000-mesh silicon carbide powder is 10% and the 2000-mesh silicon nitride powder is 20%), and 5% of dispersing agent (wherein the white carbon black is 1%, the 50-nanometer silicon nitride powder is 2% and the 200-nanometer silicon carbide powder is 2%).
after the components are mixed, a stirrer is used for fully stirring for 40 minutes, the base material and the fabric are uniformly dispersed, fine and free of granular feeling, and the environment temperature is 23 ℃ during preparation.
The repair coating of the embodiment is used for repairing a solidified carbon felt (1400X 45 mm) of a heat-insulating plate at the bottom of a polysilicon ingot furnace (the upper surface of the solidified carbon felt of the bottom heat-insulating plate is oxidized and falls off by about 25%, and the manufacturer discards the carbon felt), and comprises the following steps:
(1) And (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) coating the primer, namely uniformly coating the primer of the coating of the embodiment on the surface of the cured carbon felt treated in the step (1), wherein the coating amount of the primer is 850g/m 2;
(3) curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, wherein the curing temperature is 250 ℃, and the heat preservation time is 2.5 hours; cooling to below 100 deg.C, taking out, and cooling to room temperature;
(4) brushing the fabric for the first time, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (3), wherein the brushing amount of the fabric is 650g/m 2;
(5) First ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (4), wherein the ceramic treatment temperature is 950 ℃, and preserving heat for 3.5 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature;
(6) Secondary fabric brushing, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (5) again, wherein the brushing amount of the fabric is 250g/m 2;
(7) secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment temperature is 1000 ℃, and preserving heat for 3.5 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature; namely, the finished product is obtained after the repair is finished.
the repaired bottom insulation board solidified carbon felt is continuously used in a polysilicon ingot furnace, no pulverization, no cutting, no slag falling and strength can reach the state of a new product in the using process, the service life of the repaired product is slightly longer than that of the new product, the service life of the repaired product is 213 heats, and the service life of the new product is 200 heats; the service life of the product is prolonged by about one time, and the use cost of the cured carbon felt is greatly reduced.
Example 6
The coating for repairing the cured carbon felt comprises a backing material and a surface material,
the base material comprises the following components in percentage by weight: 53 percent of adhesive (13 percent of aqueous phenolic resin, 30 percent of polyvinyl alcohol with the concentration of 5 percent, 10 percent of acrylic resin), 38 percent of thermal expansion buffering agent (5 percent of 2000-mesh graphite powder, 5 percent of 1000-mesh graphite powder and 28 percent of graphite emulsion) and 9 percent of reinforcing agent (6 percent of 2000-mesh silicon carbide powder and 3 percent of 2000-mesh silicon nitride powder);
The fabric comprises the following components in percentage by weight: 50% of adhesive (40% of liquid polycarbosilane, 4% of organic polysilazane and 6% of perhydropolysilazane), 43% of reinforcing agent (10% of 2000-mesh silicon powder, 10% of 1000-mesh silicon carbide powder, 10% of 2000-mesh silicon carbide powder and 13% of 2000-mesh silicon nitride powder) and 7% of dispersing agent (5% of white carbon black, 1% of 150-nanometer silicon nitride powder and 1% of 80-nanometer silicon carbide powder).
after the components are mixed, a stirrer is used for fully stirring for 35 minutes, the base material and the surface material are uniformly dispersed, fine and free of granular feeling, and the environment temperature is 20 ℃ during preparation.
The repairing coating of the embodiment is used for repairing a solidified carbon felt (1404 × 1404 × 50 mm) of a polysilicon ingot casting top insulation board (the upper surface of the solidified carbon felt of the top insulation board is oxidized and falls off by about 20%, and a manufacturer discards the carbon felt), and comprises the following steps:
(1) And (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) Coating the primer, namely uniformly coating the primer of the coating of the embodiment on the surface of the cured carbon felt treated in the step (1), wherein the coating amount of the primer is 920g/m 2;
(3) curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, wherein the curing temperature is 220 ℃, and preserving heat for 3 hours; cooling to below 100 deg.C, taking out, and cooling to room temperature;
(4) brushing the fabric for the first time, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (3), wherein the brushing amount of the fabric is 780g/m 2;
(5) First ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (4), wherein the ceramic treatment temperature is 1150 ℃, and preserving heat for 3.5 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature;
(6) Secondary fabric brushing, namely uniformly brushing the fabric of the coating of the embodiment on the surface of the cured carbon felt treated in the step (5) again, wherein the brushing amount of the fabric is 380g/m 2;
(7) secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment temperature is 1450 ℃, and preserving heat for 3 hours; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature; namely, the finished product is obtained after the repair is finished.
The repaired top insulation board solidified carbon felt is continuously used in a polysilicon ingot furnace, no pulverization, no cutting, no slag falling and strength can reach the state of a new product in the using process, the service life of the repaired product is slightly longer than that of the new product, the service life of the repaired product is 206 heats, and the service life of the new product is 200 heats; the service life of the product is prolonged by about one time, and the use cost of the cured carbon felt is greatly reduced.
the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the scope of the present invention.

Claims (10)

1. the coating for repairing the cured carbon felt is characterized by comprising a primer and a fabric, wherein the primer comprises the following components: adhesives, thermal expansion buffers and reinforcing agents; the fabric comprises the following components: a binder, a reinforcing agent and a dispersant.
2. the cured carbon felt restoration coating as claimed in claim 1, wherein the primer comprises the following components in percentage by weight: 40% -64% of adhesive, 35% -50% of thermal expansion buffering agent and 1% -10% of reinforcing agent.
3. The cured carbon felt restoration coating as claimed in claim 1 or 2, wherein the fabric comprises the following components in percentage by weight: 45-64% of adhesive, 35-45% of reinforcing agent and 1-10% of dispersing agent.
4. The cured carbon felt restoration coating according to any one of claims 1 to 3, wherein the binder in the primer is at least one of a water-based phenolic resin, polyvinyl alcohol and an acrylic resin; the thermal expansion buffering agent in the bottom material is at least one of 2000-mesh graphite powder, 1000-mesh graphite powder and graphite milk; the reinforcing agent in the bottom material is 2000-mesh silicon carbide powder and/or 2000-mesh silicon nitride powder.
5. the cured carbon felt repair coating according to any one of claims 1 to 4, wherein the binder in the fabric is at least one of liquid polycarbosilane, organic polyaza silane, perhydropolyaza silane; the reinforcing agent in the fabric is at least one of 2000-mesh silicon powder, 1000-mesh silicon carbide powder, 2000-mesh silicon carbide powder and 2000-mesh silicon nitride powder; the dispersing agent in the fabric is at least one of white carbon black, 10-200 nm silicon nitride powder and 10-200 nm silicon carbide powder.
6. use of a cured carbon mat repair coating according to any one of claims 1 to 5 in a cured carbon mat repair.
7. The use of a cured carbon felt restoration coating in a cured carbon felt restoration according to claim 6 comprising the steps of:
(1) and (3) curing the carbon felt: cleaning the oxidized and powdered part of the cured carbon felt to be repaired for later use;
(2) Coating a backing material: uniformly brushing the surface of the cured carbon felt treated in the step (1) with a primer of the coating for repairing the cured carbon felt;
(3) curing treatment of the backing material: sending the cured carbon felt processed in the step (2) into a curing furnace, curing the backing material at the curing temperature of 200-260 ℃, and preserving heat for 2-4 h; cooling to below 100 deg.C, taking out, and cooling to normal temperature;
(4) brushing the fabric for the first time: uniformly brushing the surface of the cured carbon felt treated in the step (3) with the fabric of the coating for repairing the cured carbon felt;
(5) First ceramic treatment: carrying out ceramic treatment on the cured carbon felt treated in the step (4), wherein the ceramic treatment temperature is 900-1200 ℃, and keeping the temperature for 2-4 h; cooling to below 300 ℃ along with the furnace, discharging, and cooling to normal temperature;
(6) brushing the secondary fabric: uniformly brushing the surface of the cured carbon felt treated in the step (5) with the shell fabric of the coating for repairing the cured carbon felt again;
(7) Secondary ceramic treatment: performing ceramic treatment on the cured carbon felt treated in the step (6) again, wherein the ceramic treatment is performed at the temperature of 900 ℃ and 1600 ℃, and preserving heat for 2-4 h; cooling to below 300 ℃ along with the furnace, discharging, and cooling to room temperature; namely, the finished product is obtained after the repair is finished.
8. the application of the cured carbon felt restoration coating in curing carbon felt restoration as claimed in claim 7, wherein in the step (2), the brushing amount of the primer is 800-1000g/m 2.
9. The application of the cured carbon felt restoration coating in the cured carbon felt restoration, which is characterized in that in the step (4), the brushing amount of the facing material is 600-800g/m 2.
10. the use of the cured carbon felt restoration coating in the cured carbon felt restoration according to claim 7, wherein in the step (6), the brushing amount of the facing is 200-400g/m 2.
CN201910856538.5A 2019-09-11 2019-09-11 Coating for repairing cured carbon felt and application thereof Withdrawn CN110550962A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110981525A (en) * 2020-01-12 2020-04-10 陕西美兰德炭素有限责任公司 Repairing method of carbon-carbon composite material
CN111825472A (en) * 2020-07-29 2020-10-27 上海大学绍兴研究院 Method for repairing carbon/carbon composite material
CN112679233A (en) * 2020-12-25 2021-04-20 长沙三泰新材料有限公司 Preparation method of silicon carbide coating for carbon-carbon composite material
CN115534435A (en) * 2022-11-02 2022-12-30 双良硅材料(包头)有限公司 Method for recycling cured felt

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CN106365692A (en) * 2016-08-30 2017-02-01 湖南南方搏云新材料股份有限公司 Low-density carbon/carbon heat preservation material oxidation-resistant coating and preparation process thereof
CN106752644A (en) * 2016-12-26 2017-05-31 上海东洋炭素有限公司 One kind solidification felt surface self-healing anti-oxidation coating and preparation method thereof
CN107082651A (en) * 2017-05-05 2017-08-22 航天材料及工艺研究所 A kind of coat of silicon carbide and preparation method thereof

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US4786524A (en) * 1987-07-08 1988-11-22 The United States Of America As Represented By The United States Department Of Energy Coating formulation and method for refinishing the surface of surface-damaged graphite articles
CN103601528A (en) * 2013-08-30 2014-02-26 航天材料及工艺研究所 Local coating defect repairing method for carbon/carbon composite material
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Publication number Priority date Publication date Assignee Title
CN110981525A (en) * 2020-01-12 2020-04-10 陕西美兰德炭素有限责任公司 Repairing method of carbon-carbon composite material
CN111825472A (en) * 2020-07-29 2020-10-27 上海大学绍兴研究院 Method for repairing carbon/carbon composite material
CN112679233A (en) * 2020-12-25 2021-04-20 长沙三泰新材料有限公司 Preparation method of silicon carbide coating for carbon-carbon composite material
CN115534435A (en) * 2022-11-02 2022-12-30 双良硅材料(包头)有限公司 Method for recycling cured felt

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Application publication date: 20191210