CN116553921A - High-temperature-resistant heat-insulating composite material and preparation method thereof - Google Patents
High-temperature-resistant heat-insulating composite material and preparation method thereof Download PDFInfo
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- CN116553921A CN116553921A CN202310170565.3A CN202310170565A CN116553921A CN 116553921 A CN116553921 A CN 116553921A CN 202310170565 A CN202310170565 A CN 202310170565A CN 116553921 A CN116553921 A CN 116553921A
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- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 108
- 238000002156 mixing Methods 0.000 claims abstract description 56
- 239000000919 ceramic Substances 0.000 claims abstract description 45
- 239000000835 fiber Substances 0.000 claims abstract description 44
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 39
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 36
- 229910052573 porcelain Inorganic materials 0.000 claims abstract description 34
- 239000010455 vermiculite Substances 0.000 claims abstract description 34
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 34
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 29
- 229920000742 Cotton Polymers 0.000 claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 238000000748 compression moulding Methods 0.000 claims abstract description 11
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 16
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 21
- 238000003756 stirring Methods 0.000 description 21
- 230000007246 mechanism Effects 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- 239000002994 raw material Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 239000000428 dust Substances 0.000 description 7
- 230000007935 neutral effect Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000005995 Aluminium silicate Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 235000012211 aluminium silicate Nutrition 0.000 description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 4
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 235000019359 magnesium stearate Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 238000000554 physical therapy Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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- C04B35/71—Ceramic products containing macroscopic reinforcing agents
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention provides a high-temperature-resistant heat-insulating composite material and a preparation method thereof, belonging to the technical field of composite materials, and comprising the following specific components of 40-43% of vermiculite powder, 6-9% of silicon carbide, 12-17% of ceramic fiber cotton, 18-22% of polycrystalline mullite material and 12-20% of high-frequency porcelain material, wherein the preparation steps are as follows, S1 and the ratio are as follows: sequentially weighing vermiculite powder, polycrystalline mullite material, high-frequency porcelain material, ceramic fiber cotton and silicon carbide according to weight; s2, mixing: sequentially adding the vermiculite powder, the polycrystalline mullite material, the high-frequency porcelain material, the ceramic fiber cotton and the silicon carbide which are weighed in the step S1 into a horizontal coulter type mixer for two-stage mixing to obtain a mixture A; s3, crushing: crushing the mixture A in the step S2 by using a fly cutter structure to obtain a mixture B, and carrying out compression molding on the mixture B, wherein the mixture B is formed by S4; s5, sintering; the invention can produce materials with excellent heat insulation performance through the unique composite materials, the materials also have high voltage insulation performance, the heat energy utilization rate is improved to the maximum extent, the energy is saved, and the service life is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a high-temperature-resistant heat-insulating composite material and a preparation method thereof.
Background
With the development of society, the living demands of people are higher and higher, and in the aspects of household heating appliances, kitchen cooking stoves, heating cores of radiant heat trays, heating sterilizing machines and rehabilitation physiotherapy, the application is wider, and the insulating and pressure-resistant materials are widely used.
According to different using conditions in the use process of the heating core of the radiation heat disc, the temperature of the heating core frequently suddenly changes from the ambient temperature to the heating working condition of 750-800 ℃, so that the expansion and contraction of the heat insulation insulating material of the heating core lead to the cracking of the surface of the fixed heating wire, the concave-convex deformation and a plurality of cracks are generated, the heat insulation effect is poor, the fixed heating wire surface loses the fixing function, and the heating wire is tripped out of the fixed surface and broken wire occur.
Disclosure of Invention
In view of the above, the invention provides a high temperature resistant heat insulation composite material and a preparation method thereof, and the material with excellent heat insulation performance and high voltage resistant performance is produced by the unique composite material, so that the heat energy utilization rate is improved to the maximum extent, the energy is saved, and the service life is greatly prolonged.
In order to solve the technical problems, the invention provides a high-temperature-resistant heat-insulating composite material, which comprises the following specific components:
vermiculite powder, silicon carbide, ceramic fiber cotton, polycrystalline mullite and high-frequency porcelain.
Further, the preparation method comprises the following specific components:
40-43% of vermiculite powder, 6-9% of silicon carbide, 12-17% of ceramic fiber cotton, 18-22% of polycrystalline mullite material and 12-20% of high-frequency porcelain material.
Further, the preparation method comprises the following preparation steps:
s1, proportioning: sequentially weighing vermiculite powder, polycrystalline mullite material, high-frequency porcelain material, ceramic fiber cotton and silicon carbide according to weight;
s2, mixing: sequentially adding the vermiculite powder, the polycrystalline mullite material, the high-frequency porcelain material, the ceramic fiber cotton and the silicon carbide which are weighed in the step S1 into a horizontal coulter type mixer for two-stage mixing to obtain a mixture A;
s3, crushing: crushing the mixture A in the step S2 by using a fly cutter structure to obtain a mixture B
S4, press forming: after uniformly distributing the mixture B, pressing by using a 400T press to obtain a primary blank of the heat-insulating ring heat-insulating piece;
s5, sintering: and (3) putting the primary blank of the heat-insulating ring heat-insulating piece obtained in the step (S4) into a drying furnace for drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Further, in the step S2, the first-stage mixing is forward rotation mixing, the first-stage mixing rotating speed is 400-500 rpm, the first-stage mixing time is 5-15 min, the second-stage mixing is reverse rotation mixing, the second-stage mixing rotating speed is 300-350 rpm, and the second-stage mixing time is 5-10 min.
Further, the rotating speed of fly cutter crushing in the step of S3 is 1000 rpm-1500 rpm.
Further, the granularity of the mixture B obtained in the step of S3 crushing is 10-15 meshes.
Further, the molding pressure in the step of S4 compression molding is 8-10 mpa.
Further, in the step of S5 sintering, the sintering temperature is 700-780 ℃.
The technical scheme of the invention has the following beneficial effects:
the high-temperature-resistant heat-insulating composite material and the preparation method thereof have the advantages that the used material is the material with the smallest heat conductivity of the existing solid material, has excellent heat-insulating performance and insulating high-voltage-resistant performance, ensures that the heat conduction of the heating core has directivity, improves the heat conduction efficiency of the heating core, eliminates the defects of deformation, crack and collapse of a heating disc made of common materials, improves the heat utilization rate to the greatest extent, saves energy sources, and greatly prolongs the service life of the heating disc. Technical Field
Description of the embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
Examples
Firstly, weighing 40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide;
the grain size of the vermiculite material is 30-60 meshes, the volume weight of the polycrystalline mullite is 100-200 kg/m, the high-frequency porcelain is 200-500 meshes, the ceramic fiber is 96/128/m ceramic fiber with volume density, the shrinkage of neutral acid bias line is less than or equal to 1%/1300 DEG heat conduction coefficient 800 ℃/0.16, and the silicon carbide is green silicon carbide with the hardness of 9.5 grade
40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide are sequentially conveyed into a material metering bin scale bucket through a screw mechanism by each raw material closed bin body;
conveying the materials in the metering bin to a horizontal coulter type mixer through a closed pulse dust removal lifting mechanism, stirring and mixing at a high speed, wherein the stirring and mixing speed is 450rpm, and after forward rotation and mixing for 10min, stopping for 7S, and stirring and mixing for 8min at a reverse rotation speed of 325 rpm;
starting an inner 4-group crushing fly cutter structure, and uniformly crushing the materials by the fly cutter structure at the speed of 1250rpm and 10-15 meshes, so that the materials are fully and uniformly mixed, are not agglomerated, are not precipitated, and are mixed into a finished product;
the method comprises the steps of opening a machine door, entering a finished product bin, conveying the finished product bin into a material distribution bin of a servo hydraulic special machine through a sealing pipe plate structure, uniformly distributing the material into a die cavity of a die, and performing compression molding by using 9mpa through a 400T press to obtain a primary blank of a heat-insulating ring heat-insulating piece;
and (3) putting the primary blank into a drying furnace, and heating to 700 ℃ in a curve manner to perform drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Examples
Firstly, weighing 43kg of vermiculite powder, 12kg of polycrystalline mullite material, 19kg of high-frequency porcelain material, 17kg of ceramic fiber cotton and 9kg of silicon carbide;
the grain size of the vermiculite material is 30-60 meshes, the volume weight of the polycrystalline mullite is 100-200 kg/m, the high-frequency porcelain is 200-500 meshes, the ceramic fiber is 96/128/m ceramic fiber with volume density, the shrinkage of neutral acid bias line is less than or equal to 1%/1300 DEG heat conduction coefficient 800 ℃/0.16, and the silicon carbide is green silicon carbide with the hardness of 9.5 grade
The method comprises the steps of conveying 43kg of vermiculite powder, 12kg of polycrystalline mullite material, 19kg of high-frequency porcelain material, 17kg of ceramic fiber cotton and 9kg of silicon carbide into a material metering bin hopper sequentially through each raw material closed bin body by a screw mechanism;
conveying the materials in the metering bin to a horizontal coulter type mixer through a closed pulse dust removal lifting mechanism, stirring and mixing at a high speed, wherein the stirring and mixing speed is 450rpm, and after forward rotation and mixing for 10min, stopping for 7S, and stirring and mixing for 8min at a reverse rotation speed of 325 rpm;
starting an inner 4-group crushing fly cutter structure, and uniformly crushing the materials by the fly cutter structure at the speed of 1250rpm and 10-15 meshes, so that the materials are fully and uniformly mixed, are not agglomerated, are not precipitated, and are mixed into a finished product;
the method comprises the steps of opening a machine door, entering a finished product bin, conveying the finished product bin into a material distribution bin of a servo hydraulic special machine through a sealing pipe plate structure, uniformly distributing the material into a die cavity of a die, and performing compression molding by using 9mpa through a 400T press to obtain a primary blank of a heat-insulating ring heat-insulating piece;
and (3) putting the primary blank into a drying furnace, and heating to 700 ℃ in a curve manner to perform drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Examples
Firstly, weighing 43kg of vermiculite powder, 18kg of polycrystalline mullite material, 16kg of high-frequency porcelain material, 15kg of ceramic fiber cotton and 8kg of silicon carbide;
the grain size of the vermiculite material is 30-60 meshes, the volume weight of the polycrystalline mullite is 100-200 kg/m, the high-frequency porcelain is 200-500 meshes, the ceramic fiber is 96/128/m ceramic fiber with volume density, the shrinkage of neutral acid bias line is less than or equal to 1%/1300 DEG heat conduction coefficient 800 ℃/0.16, and the silicon carbide is green silicon carbide with the hardness of 9.5 grade
The method comprises the steps of conveying 43kg of vermiculite powder, 18kg of polycrystalline mullite material, 16kg of high-frequency porcelain material, 15kg of ceramic fiber cotton and 8kg of silicon carbide into a material metering bin hopper sequentially through each raw material closed bin body by a screw mechanism;
conveying the materials in the metering bin to a horizontal coulter type mixer through a closed pulse dust removal lifting mechanism, stirring and mixing at a high speed, wherein the stirring and mixing speed is 450rpm, and after forward rotation and mixing for 10min, stopping for 7S, and stirring and mixing for 8min at a reverse rotation speed of 325 rpm;
starting an inner 4-group crushing fly cutter structure, and uniformly crushing the materials by the fly cutter structure at the speed of 1250rpm and 10-15 meshes, so that the materials are fully and uniformly mixed, are not agglomerated, are not precipitated, and are mixed into a finished product;
the method comprises the steps of opening a machine door, entering a finished product bin, conveying the finished product bin into a material distribution bin of a servo hydraulic special machine through a sealing pipe plate structure, uniformly distributing the material into a die cavity of a die, and performing compression molding by using 9mpa through a 400T press to obtain a primary blank of a heat-insulating ring heat-insulating piece;
and (3) putting the primary blank into a drying furnace, and heating to 700 ℃ in a curve manner to perform drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Examples
Firstly, weighing 40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide;
the grain size of the vermiculite material is 30-60 meshes, the volume weight of the polycrystalline mullite is 100-200 kg/m, the high-frequency porcelain is 200-500 meshes, the ceramic fiber is 96/128/m ceramic fiber with volume density, the shrinkage of neutral acid bias line is less than or equal to 1%/1300 DEG heat conduction coefficient 800 ℃/0.16, and the silicon carbide is green silicon carbide with the hardness of 9.5 grade
40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide are sequentially conveyed into a material metering bin scale bucket through a screw mechanism by each raw material closed bin body;
conveying the materials in the metering bin to a horizontal coulter type mixer through a closed pulse dust removal lifting mechanism, stirring and mixing at a high speed, wherein the stirring and mixing speed is 450rpm, and after forward rotation and mixing for 10min, stopping for 7S, and stirring and mixing for 8min at a reverse rotation speed of 325 rpm;
starting an inner 4-group crushing fly cutter structure, and uniformly crushing the materials by the fly cutter structure at the speed of 1250rpm and 10-15 meshes, so that the materials are fully and uniformly mixed, are not agglomerated, are not precipitated, and are mixed into a finished product;
the material is conveyed into a material distribution bin of a servo hydraulic special machine through a sealing tube plate structure to be uniformly distributed into a die cavity of a die, and is subjected to compression molding by using 7mpa through a 400T press to obtain a primary blank of a heat-insulating ring heat-insulating piece;
and (3) putting the primary blank into a drying furnace, and heating to 700 ℃ in a curve manner to perform drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Examples
Firstly, weighing 40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide;
the grain size of the vermiculite material is 30-60 meshes, the volume weight of the polycrystalline mullite is 100-200 kg/m, the high-frequency porcelain is 200-500 meshes, the ceramic fiber is 96/128/m ceramic fiber with volume density, the shrinkage of neutral acid bias line is less than or equal to 1%/1300 DEG heat conduction coefficient 800 ℃/0.16, and the silicon carbide is green silicon carbide with the hardness of 9.5 grade
40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide are sequentially conveyed into a material metering bin scale bucket through a screw mechanism by each raw material closed bin body;
conveying the materials in the metering bin to a horizontal coulter type mixer through a closed pulse dust removal lifting mechanism, stirring and mixing at a high speed, wherein the stirring and mixing speed is 450rpm, and after forward rotation and mixing for 10min, stopping for 7S, and stirring and mixing for 8min at a reverse rotation speed of 325 rpm;
starting an inner 4-group crushing fly cutter structure, and uniformly crushing the materials by the fly cutter structure at the speed of 1250rpm and 10-15 meshes, so that the materials are fully and uniformly mixed, are not agglomerated, are not precipitated, and are mixed into a finished product;
the material is conveyed into a material distribution bin of a servo hydraulic special machine through a sealing tube plate structure to be uniformly distributed into a die cavity of a die, and is subjected to compression molding by a 400T press at 8mpa to obtain a primary blank of a heat-insulating ring heat-insulating piece;
and (3) putting the primary blank into a drying furnace, and heating to 700 ℃ in a curve manner to perform drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Examples
Firstly, weighing 40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide;
the grain size of the vermiculite material is 30-60 meshes, the volume weight of the polycrystalline mullite is 100-200 kg/m, the high-frequency porcelain is 200-500 meshes, the ceramic fiber is 96/128/m ceramic fiber with volume density, the shrinkage of neutral acid bias line is less than or equal to 1%/1300 DEG heat conduction coefficient 800 ℃/0.16, and the silicon carbide is green silicon carbide with the hardness of 9.5 grade
40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide are sequentially conveyed into a material metering bin scale bucket through a screw mechanism by each raw material closed bin body;
conveying the materials in the metering bin to a horizontal coulter type mixer through a closed pulse dust removal lifting mechanism, stirring and mixing at a high speed, wherein the stirring and mixing speed is 450rpm, and after forward rotation and mixing for 10min, stopping for 7S, and stirring and mixing for 8min at a reverse rotation speed of 325 rpm;
starting an inner 4-group crushing fly cutter structure, and uniformly crushing the materials by the fly cutter structure at the speed of 1250rpm and 10-15 meshes, so that the materials are fully and uniformly mixed, are not agglomerated, are not precipitated, and are mixed into a finished product;
the method comprises the steps of opening a machine door, entering a finished product bin, conveying the finished product bin into a material distribution bin of a servo hydraulic special machine through a sealing pipe plate structure, uniformly distributing the material into a die cavity of a die, and performing compression molding by using 9mpa through a 400T press to obtain a primary blank of a heat-insulating ring heat-insulating piece;
and (3) putting the primary blank into a drying furnace, and heating to 650 ℃ in a curve manner to perform drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Examples
Firstly, weighing 40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide;
the grain size of the vermiculite material is 30-60 meshes, the volume weight of the polycrystalline mullite is 100-200 kg/m, the high-frequency porcelain is 200-500 meshes, the ceramic fiber is 96/128/m ceramic fiber with volume density, the shrinkage of neutral acid bias line is less than or equal to 1%/1300 DEG heat conduction coefficient 800 ℃/0.16, and the silicon carbide is green silicon carbide with the hardness of 9.5 grade
40kg of vermiculite powder, 22kg of polycrystalline mullite material, 20kg of high-frequency porcelain material, 12kg of ceramic fiber cotton and 6kg of silicon carbide are sequentially conveyed into a material metering bin scale bucket through a screw mechanism by each raw material closed bin body;
conveying the materials in the metering bin to a horizontal coulter type mixer through a closed pulse dust removal lifting mechanism, stirring and mixing at a high speed, wherein the stirring and mixing speed is 450rpm, and after forward rotation and mixing for 10min, stopping for 7S, and stirring and mixing for 8min at a reverse rotation speed of 325 rpm;
starting an inner 4-group crushing fly cutter structure, and uniformly crushing the materials by the fly cutter structure at the speed of 1250rpm and 10-15 meshes, so that the materials are fully and uniformly mixed, are not agglomerated, are not precipitated, and are mixed into a finished product;
the method comprises the steps of opening a machine door, entering a finished product bin, conveying the finished product bin into a material distribution bin of a servo hydraulic special machine through a sealing pipe plate structure, uniformly distributing the material into a die cavity of a die, and performing compression molding by using 9mpa through a 400T press to obtain a primary blank of a heat-insulating ring heat-insulating piece;
and (3) putting the primary blank into a drying furnace, and heating to 750 ℃ in a curve manner to perform drying and sintering to obtain the heat-insulating ring heat-insulating piece.
Comparative example one
High-frequency porcelain powder: 7%
Mullite: 30%
Ceramic fiber: 10 percent of
Silicic acid material: 13%
Weather silica: 40 percent of
In this case, the high-frequency porcelain is 300-600 meshes, the mullite is 1200-2000 meshes, the ceramic fiber is 12um, the glass fiber is 12um, and the length is 15-30 mm. The silicate material is silicate. The surface area of the nano silicon dioxide (aerosil) is 200 square meters per gram, and the bonding agent is sodium silicate, silica sol and aluminum dihydrogen phosphate.
The raw materials are automatically conveyed into a horizontal mixing bin according to a proportion by weight measurement, are mixed at a high speed by a coulter device, and are broken by a fly cutter, so that the agglomeration and aggregation of the materials are prevented. Uniformly mixing for 10-35 min, passing through a pre-prepared binder slurry, and mixing for 5-10 min at a high speed. The finished product mixture is conveyed into a pre-storage bin at the front end of automatic forming equipment through a screw, automatically and uniformly distributed into a die cavity, then is pressed into a heat insulation ring and a heat insulation part primary blank through a forming machine and is subjected to post-thermal technology treatment and the like to obtain the finished product heat insulation ring heat insulation part.
Comparative example two
Magnesium stearate: 2%
Titanium dioxide: 5%
Vermiculite: 40 percent of
Kaolin: 18%
Silica: 35%
In the case, the magnesium stearate has a density of 1.028g/cm, a refractive index of 1.45 (25 ℃) and titanium dioxide has a refractive index of 2.76-2.55, a density of 4.26g/cm3 and vermiculite: volume weight (0.07-0.25 g/cm 3), total porosity of 133.5%, macropores of 25.0%, microporosity of 108.5%, conductivity of 0.36mS/cm, kaolin density: 2.54-2.60 g/cm3. Melting point: about 1700 ℃, 300-600 meshes, the silicon dioxide has a melting point of 1723 ℃, a refractive index of about 1.6 and a specific surface area of 100-400 square meters per gram.
The materials are fully mixed by mixing equipment according to weight percentage, and then are put into a molding die cavity for 5S-10 s compression molding, so that the heat insulation ring and the heat insulation piece product are obtained.
Comparative example three
Electric melting mullite: 45%
Ceramic granulating powder: 5%
Mica powder: 5%
Ceramic fiber cotton: 15%
Silica: 25 percent of
Calcining kaolin: 5%
In the case, the volume density of the fused mullite is 3g/cm & lt 3 & gt, 320 meshes, the thermal conductivity coefficient of the ceramic fiber cotton is 800 ℃/0.16, the ceramic granulation powder is 3.75-3.9 g/cm, the sintering density is 4.45, the specific surface area of silicon dioxide is 150 square meters/g, and the specific surface area is 10-30 nm. The calcined kaolin is 2.5-2.6/cm.
The materials are metered by a metering bin according to the weight ratio, enter a mixing host machine, are crushed and mixed with fiber cotton, are evenly mixed with the materials, are injected with a bonding agent, are mixed for 5min, are placed into a press die cavity, and are molded and pressed by hydraulic molding equipment for 2S-5S, so that a heat insulation ring product and a heat insulation piece product are obtained.
Intensity test: 4 points/impacts three times each;
working condition environment of aging test: 750 ℃/h;
| project test name | Example 1 | Example two | Example III | Example IV | Example five | Example six | Example seven |
| Thermal insulation test | 195~200℃ | 230~235℃ | 225~230℃ | 215~220℃ | 205~215℃ | 200~210℃ | 215~220℃ |
| Insulation of | 1200MΩ | 890MΩ | 850MΩ | 920MΩ | 950MΩ | 960MΩ | 910MΩ |
| Withstand voltage | 2700V | 2000V | 1800V | 1700V | 2200V | 2350V | 2250V |
| Leakage of | 3.2MA | 5.4MA | 6MA | 7.3MA | 5.5MA | 4.5MA | 5.0MA |
| Strength of | 1.3J | 0.6J | 0.56J | 0.7J | 0.43J | 0.9J | 1.1J |
| Tension force | 3.5-3.7KG | 3.1-3.3KG | 2.6KG | 2.5-2.7KG | 3KG | 3.2-3.3KG | 2.9-3.1KG |
| Aging | 200 | 160 | 175 | 155 | 180 | 190 | 175 |
| Color of | Off-white | Off-white | Off-white | Off-white | Off-white | Off-white | Off-white |
| Appearance of | Without any means for | Without any means for | Without any means for | Without any means for | Without any means for | Without any means for | Without any means for |
| Performance of | Excellent (excellent) | Good grade (good) | Excellent (excellent) | Good grade (good) | Excellent (excellent) | Excellent (excellent) | Good grade (good) |
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (8)
1. The high-temperature-resistant heat-insulating composite material is characterized by comprising the following specific components:
vermiculite powder, silicon carbide, ceramic fiber cotton, polycrystalline mullite and high-frequency porcelain.
2. The high temperature resistant and heat insulating composite material according to claim 1, which comprises the following specific components:
40-43% of vermiculite powder, 6-9% of silicon carbide, 12-17% of ceramic fiber cotton, 18-22% of polycrystalline mullite material and 12-20% of high-frequency porcelain material.
3. The method for preparing the high-temperature-resistant heat-insulating composite material according to claim 2, comprising the following preparation steps:
s1, proportioning: sequentially weighing vermiculite powder, polycrystalline mullite material, high-frequency porcelain material, ceramic fiber cotton and silicon carbide according to weight;
s2, mixing: sequentially adding the vermiculite powder, the polycrystalline mullite material, the high-frequency porcelain material, the ceramic fiber cotton and the silicon carbide which are weighed in the step S1 into a horizontal coulter type mixer for two-stage mixing to obtain a mixture A;
s3, crushing: crushing the mixture A in the step S2 by using a fly cutter structure to obtain a mixture B;
s4, press forming: after uniformly distributing the mixture B, pressing by using a 400T press to obtain a primary blank of the heat-insulating ring heat-insulating piece;
s5, sintering: and (3) putting the primary blank of the heat-insulating ring heat-insulating piece obtained in the step (S4) into a drying furnace for drying and sintering to obtain the heat-insulating ring heat-insulating piece.
4. A method of preparing the high temperature resistant and heat insulating composite material according to claim 3, wherein: in the S2 mixing step, the first-stage mixing is forward rotation mixing, the first-stage mixing rotating speed is 400-500 rpm, the first-stage mixing time is 5-15 min, the second-stage mixing is reverse rotation mixing, the second-stage mixing rotating speed is 300-350 rpm, and the second-stage mixing time is 5-10 min.
5. A method of preparing the high temperature resistant and heat insulating composite material according to claim 3, wherein: and in the step of S3, the rotating speed of fly cutter crushing is 1000 rpm-1500 rpm.
6. A method of preparing the high temperature resistant and heat insulating composite material according to claim 3, wherein: and (3) the granularity of the mixture B obtained in the step of S3 crushing is 10-15 meshes.
7. A method of preparing the high temperature resistant and heat insulating composite material according to claim 3, wherein: and in the step of S4 compression molding, the molding pressure is 8-10 mpa.
8. A method of preparing the high temperature resistant and heat insulating composite material according to claim 3, wherein: in the S5 sintering step, the sintering temperature is 700-780 ℃.
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