CN113547799A - Method for preparing soft carbon fiber heat-preservation felt by adopting batch-type industrial furnace - Google Patents
Method for preparing soft carbon fiber heat-preservation felt by adopting batch-type industrial furnace Download PDFInfo
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- CN113547799A CN113547799A CN202110921634.0A CN202110921634A CN113547799A CN 113547799 A CN113547799 A CN 113547799A CN 202110921634 A CN202110921634 A CN 202110921634A CN 113547799 A CN113547799 A CN 113547799A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
- B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
- B32B2262/065—Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
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Abstract
The invention discloses a method for preparing a soft carbon fiber heat-preservation felt by adopting an intermittent industrial furnace, which comprises the following steps: opening the organic fibers, and forming a net to prepare an organic fiber net blank; sequentially and circularly superposing the organic fiber net tires, and introducing organic fiber bundles between layers to prepare an organic fiber felt; the organic fiber felt is repeatedly laminated by reducing the width layer by layer from the bottom of the intermittent industrial furnace upwards, graphite paper is laid between layers, and the organic fiber felt is heated to be pre-carbonized and carbonized to prepare a carbon felt; and tightly bundling the carbon felt by taking the carbon roller as a shaft, and performing heat treatment to obtain the soft carbon fiber heat-insulating felt. The soft carbon fiber heat-insulating felt ensures the uniformity of the carbon fiber soft felt in all directions, thereby ensuring the smoothness and continuity of the carbon felt in the carbonization process; and ensures low thermal conductivity of the material.
Description
Technical Field
The invention relates to the technical field of preparation of heat insulation materials, in particular to a method for preparing a soft carbon fiber heat insulation felt by adopting an intermittent industrial furnace.
Background
The development of environment-friendly heat-insulating materials by adopting new technology and new process is the most effective and economic measure for saving energy and is an effective way for human sustainable development. In industrial furnaces, China currently has more than 5 million high-temperature furnaces such as a vacuum sintering furnace, a monocrystalline silicon furnace, a polycrystalline silicon furnace, a vacuum smelting furnace, a vacuum heat treatment furnace, a vacuum vapor deposition furnace and the like, and most of heat insulation materials of the high-temperature vacuum equipment (furnace) and the non-oxidation atmosphere high-temperature equipment (furnace) are carbon felts.
The carbon fiber soft felt has the excellent performances of small heat conductivity coefficient, low thermal capacity, small density, small linear expansion coefficient, high temperature resistance, strong thermal shock resistance, strong chemical corrosion resistance, high purity, no pollution and the like, can reduce the power consumption by about 75 percent compared with a metal reflection heat shield, can be simply cut and cut, has strong operability during construction and good heat insulation effect, and is a heat insulation material which is most used at present. With the rapid development of the solar photovoltaic industry, the crystal silicon industry is driven to greatly flourish, and as an important high-temperature furnace thermal field heat insulation material, the demand of high-quality carbon fiber felt reaches unprecedented height. The carbon fiber soft felt is generally carbonized by a continuous heating furnace, the production efficiency is high, the quality is good, and the cost is low, but the continuous heating furnace has high input cost and large maintenance workload, and particularly causes great waste when the quantity is small. The batch type industrial furnace has low investment cost, small occupied area and flexible and convenient start, and is particularly suitable for medium and small-sized production. However, the length and width of the carbon fiber soft felt are required, which is a great difficulty for a batch type industrial furnace, and more importantly, the felt body has a shrinkage rate of about 30% in the preparation process, so that the uniformity, flatness and softness of the carbon felt are maintained, which is a great challenge, and a stronger technical support is required.
Therefore, those skilled in the art have made an effort to develop a method for manufacturing a soft carbon fiber insulation blanket using a batch type industrial furnace to ensure uniformity and flatness of the anisotropic shrinkage of the carbon fiber insulation blanket.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the invention is to ensure the uniformity and the evenness of the anisotropic shrinkage of the carbon fiber soft felt.
In order to achieve the aim, the invention provides a method for preparing a soft carbon fiber heat-preservation felt by adopting a batch type industrial furnace, which comprises the following steps:
step 1, opening and netting organic fibers to prepare an organic fiber net tire;
step 2, circularly superposing the organic fiber net tires in sequence, and introducing organic fiber bundles between layers to prepare an organic fiber felt;
3, reducing the width of the organic fiber felt layer by layer from the bottom of the intermittent industrial furnace upwards for repeated lamination, laying graphite paper between layers, heating for pre-carbonization and carbonization to prepare a carbon felt;
and 4, tightly and tightly bundling the carbon felt by taking the carbon roller as a shaft, and performing heat treatment to obtain the soft carbon fiber heat-preservation felt.
Further, the organic fiber in the step 1 is selected from one or more of pitch-based fiber, viscose-based fiber, PAN-based fiber and wood fiber.
Further, the step 1 specifically includes: opening the organic fiber into fluffy single-fiber-shaped fiber by opening equipment, then forming a web by air-laying and/or carding the opened fiber, and laying the web into a fiber web by a lapping machine to prepare the organic fiber web tire.
Further, the organic fibrous web tire has an areal density of between 1500 g/SQM and 3500 g/SQM.
Further, the step 2 of introducing the organic fiber bundles between the layers specifically includes: and repeatedly needling the organic fiber net tire which is overlapped in a circulating way by adopting lower barbed stabs, wherein when the needling is carried out, the lower barbed stabs are used for leading the fibers in the organic fiber net tire to be vertical.
Further, the density of cloth needles adopted by the needling is 8-20 needles per square centimeter.
Further, the pre-carbonization temperature in the step 3 is between 0 ℃ and 180 ℃, the carbonization temperature is between 500 ℃ and 900 ℃, and the overall time of pre-carbonization and carbonization is between 5 and 20 hours.
Further, the cross section formed by repeatedly laminating the organic fiber felts in the step 3 is substantially isosceles trapezoid.
Further, the conditions of the heat treatment in the step 4 include: under the protection of inert gas and micro-positive pressure.
Further, the heat treatment temperature is between 1300 ℃ and 2300 ℃, the heat treatment time is between 3 and 10 hours, the micro-positive pressure is between 5 and 200Pa, and the inert gas comprises one of argon and nitrogen.
The invention has the beneficial effects that:
1. the width is gradually reduced from the bottom to the top layer by layer, and the organic fiber can be fully pyrolyzed and volatilized in the carbonization process by an isosceles trapezoid-like repeated lamination mode of the graphite paper lining between layers, so that the uniformity of the carbon fiber soft felt in all directions shrinkage is ensured, and the smoothness and the continuity of the carbon felt in the carbonization process are ensured; the carbon roller is used as a shaft, the flatness of the carbon felt is further adjusted in a tight binding mode, stress generated in the carbonization process is released, and low thermal conductivity of the material is guaranteed.
2. In the organic fiber carbonization process, the selection of carbonization temperature, heating rate and atmosphere is beneficial to the pyrolysis and volatilization of the organic fiber, so that the energy consumption is reduced, and the uniformity of the fiber in each direction shrinkage and the softness of the material are fully ensured. In the sectional carbonization process, a large amount of crystal water in the organic fiber felt can be removed by pre-carbonization at a low temperature section, the adverse effect of water vapor on the arrangement of carbon atoms of the carbon fiber by micromolecules in the subsequent carbonization stage is eliminated, and the oxidation resistance and the silicification resistance of the felt body are facilitated.
3. Provides a preparation technology of a high-performance continuous carbon fiber heat-preservation felt produced by adopting an intermittent industrial furnace. The material has low density (0.07-0.12 g/cm)3The carbon fiber soft heat-insulating material has the characteristics of controllable density, low thermal conductivity (0.07-0.13W/m.K) and the like, and the length and the width are controllable, so that the carbon fiber soft heat-insulating material can meet the requirements of monocrystalline silicon furnaces, polycrystalline silicon furnaces and the like in China on carbon fiber soft heat-insulating materials.
The conception, the specific structure, and the technical effects produced by the present invention will be further described below to fully understand the objects, the features, and the effects of the present invention.
Detailed Description
The following describes several preferred embodiments of the present invention to make the technical contents thereof clearer and easier to understand. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
The invention aims to provide a method for manufacturing a soft carbon fiber heat preservation felt by adopting a batch type industrial furnace, and the felt has lower density and excellent heat preservation performance.
In order to achieve the above object, the method of the present invention comprises the steps of:
(1) preparing an organic fiber felt:
selecting short organic fibers with the length of 40-100 mm according to a ratio, wherein the organic fibers are not limited to wood fibers, but also can be pitch-based fibers, viscose-based fibers, Polyacrylonitrile (PAN) -based fibers and the like, opening the short organic fibers into fluffy single fibers by opening equipment, then forming a web by air-laying and/or carding the opened carbon fibers, laying the web into a fiber web by using a laying machine, and prefabricating a web tire, wherein the surface density of the web tire is 1500-3500 g/SQM. The method comprises the following steps of sequentially and circularly superposing the net tires (laminating for at least 2 times), introducing organic fiber bundles between layers, specifically, repeatedly needling the superposed organic fiber net tires by adopting lower barb stabs to prepare an organic fiber felt, and carrying out the lower barb stabs to vertically take the net tire fibers when needling. Preferably, the density of the cloth needles is 8-20 needles per square centimeter. The organic fiber felt can be designed to be 0.12-0.20 g/cm according to the requirements of final products3In the meantime. The thickness, width and length of the organic fiber felt can be designed according to requirements.
(2) Charring of organic fiber mats
The method adopts an isosceles trapezoid-like repeated lamination mode of reducing the width layer by layer from the bottom of an intermittent industrial furnace upwards, lays graphite paper between layers, heats up and carbonizes, ensures that the organic fiber felt is fully pyrolyzed and discharges gas, and simultaneously ensures the uniformity and the evenness of the carbon fiber soft felt in all directions of shrinkage.
By adopting the intermittent industrial furnace, the products are batched, the floor area, the equipment investment and the number of operators are saved, and the one-time investment of a production enterprise is reduced. The spreading mode ensures the uniform and continuous shrinkage of the product in all directions. Without a pre-oxidation stage, so thatThe process flow is simplified. The graphite paper is laid between layers, so that the heat dissipation performance can be increased, heat conduction is uniform along all directions, a hot spot area is eliminated, the temperature uniformity during hot processing is ensured, and the exhaust guidance performance is improved. Obtaining a flat carbon fiber felt (carbon felt), wherein the density is controlled to be 0.07-0.11 g/cm3。
Preferably, the carbonization process of the organic fiber felt is carried out in two stages, pre-carbonization is carried out at a low temperature (between 0 and 180 ℃), the temperature rise rate is 5 to 30 ℃/min, a large amount of crystal water in the organic fiber felt is removed, the adverse effect of water vapor on the arrangement of carbon atoms of the carbon fiber by small molecules in the subsequent carbonization stage is eliminated, and the oxidation resistance and the anti-silicification performance of the felt body are facilitated; and carbonizing the organic carbon felt at the middle-high temperature section. The carbonization temperature is 500-900 ℃, the temperature rise rate is 10-30 ℃/min, and the total carbonization time is 5-20 hours.
(3) High temperature treatment of carbon fiber felt
And (3) tightly and tightly bundling the carbon felt obtained in the step (2) by taking a carbon roller as an axis, winding the carbon felt into a cylinder along the length direction, placing the cylinder in an intermittent industrial furnace for high-temperature heat treatment, relieving the stress generated in the carbonization process of the carbon fiber preform, further removing organic components in the carbon fiber, and ensuring that the material has long service life while ensuring low density and low thermal conductivity. The charcoal quality cylinder plays the effect of supporting and bearing the charcoal felt, can prevent the charcoal felt and convolute the distortion that causes and be heated unevenly.
Preferably, the heat treatment temperature is 1300-2300 ℃, the whole process time is 3-10 hours, the pressure is micro-positive pressure (namely slightly exceeds 0 scale of a vacuum pressure gauge, such as 5-200 Pa), and the inert gas (argon, nitrogen and the like) is used for protection.
Example 1
The preparation process and the technological parameters of the soft carbon fiber heat-preservation felt are as follows:
(1) sequentially opening organic wood fiber to obtain organic fiber net tire with surface density of 1500 g/SQM, and repeatedly needling in the direction perpendicular to the layering direction to obtain organic fiber felt with density of 0.20 g/cm3(ii) a The organic fiber felt is 18 meters long and 1.600 meters wide.
(2) Spreading organic fiber felt from one end, and gradually decreasing from the bottom of intermittent industrial furnaceRepeatedly laminating isosceles trapezoid-like structures which are small in width and are lined with graphite paper between layers, pre-carbonizing (the heating rate is 10 ℃/min), heating to 180 ℃, keeping the temperature for 2 hours, carbonizing (the heating rate is 15 ℃/min to 300 ℃, keeping the temperature for 30 minutes, the heating rate is 15 ℃/min to 450 ℃, keeping the temperature for 1 hour, then heating to 650 ℃, keeping the temperature for 1 hour, cooling to 500 ℃ at the cooling rate of 10 ℃/min, continuously introducing nitrogen to the room temperature), and carbonizing for 12 hours in total time; obtaining a flat carbon fiber felt material with the density controlled at 0.090 g/cm3。
(3) Tightly binding the obtained carbon fiber felt with carbon rope by using a carbon roller as a shaft, further adopting nitrogen protection, and carrying out high-temperature heat treatment at 1900 ℃ for 1 hour to obtain the carbon fiber felt with the density of 0.085 g/cm3The carbon fiber heat-insulating felt.
The obtained carbon fiber heat-insulating felt is about 12.5 meters long and 1.10 meters wide, is soft and less in ash, comfortable in hand feeling, smooth in fiber surface, less in wrinkles, good in uniformity and uniform in gap structure among fibers. The material has low density, low room temperature heat conductivity and strong silicification corrosion resistance, and shows that all indexes of the carbon fiber heat-insulating material meet the requirements of industrial furnaces and the like on soft heat-insulating materials.
Example 2
The preparation process and the technological parameters of the soft carbon fiber heat-preservation felt are as follows:
(1) sequentially opening organic wood fiber to obtain organic fiber net tire with surface density of 2500 g/SQM, and repeatedly needling in the direction perpendicular to the layering direction to obtain organic fiber felt with density of 0.17 g/cm3(ii) a The organic fiber felt is 15 meters long and 1.600 meters wide.
(2) Paving an organic fiber felt from one end, gradually reducing the width from the bottom of an intermittent industrial furnace to the top layer by layer, repeatedly laminating layers by an isosceles trapezoid like graphite paper for lining, pre-carbonizing (the heating rate is 10 ℃/min), heating to 180 ℃, keeping the temperature for 2 hours, carbonizing (the heating rate is 15 ℃/min to 300 ℃, keeping the temperature for 50 minutes, the heating rate is 15 ℃/min to 450 ℃, keeping the temperature for 1.2 hours, then the heating rate is 20 ℃/min to 600 ℃, keeping the temperature for 1.2 hours, the cooling rate is 10 ℃/min, cooling to 450 ℃, continuously introducing nitrogen to the room temperature), and carbonizing for 14 hours; obtaining a flat carbon fiber felt material with the density controlled at 0.088g/cm3。
(3) Tightly binding the obtained carbon fiber felt with carbon rope by using a carbon roller as a shaft, further performing high-temperature heat treatment at 1900 ℃ for 1 hour under the protection of argon gas to obtain the carbon fiber felt with the density of 0.082 g/cm3The carbon fiber heat-insulating felt.
The obtained carbon fiber heat-insulating felt is about 12.5 meters long and 1.10 meters wide, is soft and less in ash, comfortable in hand feeling, smooth in fiber surface, less in wrinkles, good in uniformity and uniform in gap structure among fibers. The material has low density, low room temperature heat conductivity and strong silicification corrosion resistance, and shows that all indexes of the carbon fiber heat-insulating material meet the requirements of industrial furnaces and the like on soft heat-insulating materials.
Example 3
The preparation process and the technological parameters of the soft carbon fiber heat-preservation felt are as follows:
(1) sequentially opening organic wood fibers to prepare organic fiber net tires with the surface density of 3500 g/SQM, and repeatedly needling the organic fiber net tires in the direction vertical to the layering direction to prepare organic fiber felts with the density of 0.18 g/cm3(ii) a The organic fiber felt is 12 meters long and 1.700 meters wide.
(2) Paving an organic fiber felt from one end, gradually reducing the width from the bottom of an intermittent industrial furnace to the top layer by layer, repeatedly laminating layers by an isosceles trapezoid like graphite paper for lining, pre-carbonizing (the heating rate is 5 ℃/min), heating to 180 ℃, keeping the temperature for 2 hours, carbonizing (the heating rate is 12 ℃/min to 300 ℃, keeping the temperature for 1 hour, the heating rate is 12 ℃/min to 450 ℃, keeping the temperature for 1.5 hours, then the heating rate is 20 ℃/min to 620 ℃, keeping the temperature for 1.2 hours, the cooling rate is 10 ℃/min, cooling to 450 ℃, continuously introducing nitrogen to the room temperature), and carbonizing for 12 hours; obtaining a flat carbon fiber felt material with the density controlled at 0.100 g/cm3。
(3) Tightly binding the obtained carbon fiber felt with carbon rope by using a carbon roller as a shaft, further adopting argon protection, and carrying out high-temperature heat treatment at 1900 ℃ for 1 hour to obtain the carbon fiber felt with the density of 0.090 g/cm3The carbon fiber heat-insulating felt.
The obtained carbon fiber heat-insulating felt is about 8.5 meters long and 1.20 meters wide, is soft and less in ash, comfortable in hand feeling, smooth in fiber surface, less in wrinkles, good in uniformity and uniform in gap structure among fibers. The material has low density, low room temperature heat conductivity and strong silicification corrosion resistance, and indicates that all indexes of the carbon fiber heat-insulating material meet the requirements of industrial furnaces and the like on soft heat-insulating materials.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A method for preparing a soft carbon fiber heat-preservation felt by adopting a batch industrial furnace is characterized by comprising the following steps:
step 1, opening and netting organic fibers to prepare an organic fiber net tire;
step 2, circularly superposing the organic fiber net tires in sequence, and introducing organic fiber bundles between layers to prepare an organic fiber felt;
3, reducing the width of the organic fiber felt layer by layer from the bottom of the intermittent industrial furnace upwards for repeated lamination, laying graphite paper between layers, heating for pre-carbonization and carbonization to prepare a carbon felt;
and 4, tightly and tightly bundling the carbon felt by taking the carbon roller as a shaft, and performing heat treatment to obtain the soft carbon fiber heat-preservation felt.
2. The method for preparing the soft carbon fiber thermal insulation felt by using the batch type industrial furnace as claimed in claim 1, wherein the organic fiber in the step 1 is selected from one or more of pitch-based fiber, viscose-based fiber, PAN-based fiber and wood fiber.
3. The method for preparing the soft carbon fiber heat-preservation felt by adopting the batch type industrial furnace according to claim 1, wherein the step 1 specifically comprises the following steps: opening the organic fiber into fluffy single-fiber-shaped fiber by opening equipment, then forming a web by air-laying and/or carding the opened fiber, and laying the web into a fiber web by a lapping machine to prepare the organic fiber web tire.
4. The method of making a soft carbon fiber insulation blanket using a batch industrial furnace of claim 3 wherein the organic fiber web batt has an areal density of between 1500 g/SQM and 3500 g/SQM.
5. The method for preparing the soft carbon fiber heat-preservation felt by adopting the batch type industrial furnace as claimed in claim 1, wherein the step 2 of introducing the organic fiber bundles between the layers specifically comprises the following steps: and repeatedly needling the organic fiber net tire which is overlapped in a circulating way by adopting lower barbed stabs, wherein when the needling is carried out, the lower barbed stabs are used for leading the fibers in the organic fiber net tire to be vertical.
6. The method for preparing a soft carbon fiber insulation blanket using a batch industrial furnace according to claim 5, wherein the needling uses a cloth needle density of 8 to 20 needles per square centimeter.
7. The method for preparing a soft carbon fiber insulation blanket using a batch industrial furnace as claimed in claim 1, wherein the pre-carbonization temperature in the step 3 is between 0 ℃ and 180 ℃, the carbonization temperature is between 500 ℃ and 900 ℃, and the whole time of the pre-carbonization and carbonization is between 5 and 20 hours.
8. The method for preparing a soft carbon fiber heat-insulating felt by using a batch industrial furnace as claimed in claim 1, wherein the cross section of the organic fiber felt formed in the step 3 after repeated lamination is substantially isosceles trapezoid.
9. The method for preparing a soft carbon fiber thermal blanket using a batch type industrial furnace as claimed in claim 1, wherein the conditions of the heat treatment in the step 4 include: under the protection of inert gas and micro-positive pressure.
10. The method of making a soft carbon fiber insulation blanket using a batch industrial furnace of claim 9 wherein the heat treatment temperature is between 1300 ℃ and 2300 ℃, the heat treatment time is between 3 and 10 hours, the micro positive pressure is between 5 and 200Pa, and the inert gas comprises one of argon and nitrogen.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101550017A (en) * | 2009-05-12 | 2009-10-07 | 湖南金博复合材料科技有限公司 | High temperature furnace-grade curing carbon fiber thermal insulating material and production technology thereof |
| CN104058776A (en) * | 2014-07-09 | 2014-09-24 | 四川创越炭材料有限公司 | Preparation method of hard carbon fiber heat preservation material prepared from carbon fiber balls |
| CN105479829A (en) * | 2016-01-13 | 2016-04-13 | 青岛高泰新材料有限公司 | Low-density carbon fiber hard insulation quilt and preparation method thereof |
| CN112522857A (en) * | 2020-11-12 | 2021-03-19 | 因达孚先进材料(苏州)有限公司 | Preparation method of high-thickness hard felt |
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- 2021-08-12 CN CN202110921634.0A patent/CN113547799B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101550017A (en) * | 2009-05-12 | 2009-10-07 | 湖南金博复合材料科技有限公司 | High temperature furnace-grade curing carbon fiber thermal insulating material and production technology thereof |
| CN104058776A (en) * | 2014-07-09 | 2014-09-24 | 四川创越炭材料有限公司 | Preparation method of hard carbon fiber heat preservation material prepared from carbon fiber balls |
| CN105479829A (en) * | 2016-01-13 | 2016-04-13 | 青岛高泰新材料有限公司 | Low-density carbon fiber hard insulation quilt and preparation method thereof |
| CN112522857A (en) * | 2020-11-12 | 2021-03-19 | 因达孚先进材料(苏州)有限公司 | Preparation method of high-thickness hard felt |
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