CN110548862A - Ceramic fiber thermal insulation material covered with aluminum film - Google Patents
Ceramic fiber thermal insulation material covered with aluminum film Download PDFInfo
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- CN110548862A CN110548862A CN201910992164.XA CN201910992164A CN110548862A CN 110548862 A CN110548862 A CN 110548862A CN 201910992164 A CN201910992164 A CN 201910992164A CN 110548862 A CN110548862 A CN 110548862A
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- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
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Abstract
the invention discloses a ceramic fiber heat-insulating material covered with an aluminum film, which comprises a non-heated layer, wherein the upper surface of the non-heated layer is fixedly connected with a heated layer, and the surface of the heated layer is fixedly connected with the aluminum film; the unheated layer is composed of the following raw materials: 55% of ceramic fiber, 10% of sol binder, 8% of starch, 20% of clay and 7% of silica powder; the heat receiving layer is composed of the following raw materials: 50-55% of refractory fiber, 10-15% of clay, 8% of starch, 2% of organic binder, 1% of inorganic binder, 7% of alumina powder, 4% of corundum powder, 2% of heat insulation additive and 11% of sol binder. In the ceramic fiber heat-insulating material covered with the aluminum film, the material of the heat-receiving layer is high-aluminum refractory fiber, wherein the content of aluminum oxide reaches more than 60%, the heat-resistant temperature of the heat-resistant layer is up to 1400 ℃, the temperature of the heat-receiving layer of the heat-insulating material is up to 2054 ℃ which is the same as the melting point of aluminum oxide by arranging an aluminum oxide thin film layer on the surface of the heat-insulating material, the heat-receiving layer of the heat-insulating material can be directly contacted with flame, and the sol combination mode is convenient for quick baking and continuous operation.
Description
Technical Field
the invention relates to the technical field of heat insulation materials, in particular to a ceramic fiber heat insulation material covered with an aluminum film.
Background
many technical measures are taken to improve the quality of the cast slab. In the aspect of continuous casting, a non-oxidation casting technology is mainly adopted to prevent secondary oxidation of molten steel, reduce inclusions in steel and improve the purity of the molten steel and the quality of a casting blank. This is often done by means of sealing casting. It is necessary to protect the sealing performance of the pouring ports and the temperature measuring ports of the tundish cover and the tundish edge by contacting the pouring ports and the temperature measuring ports. Conventional sealing materials are cast sheets, paints or plastics. These materials are prone to generate a large number of cracks at high temperature, and cannot achieve a strict sealing state, and the heat insulation performance is also poor. In particular, in the later stage of use, the metal frame of the tundish cover is liable to warp and deform under the action of a high temperature for a long time, and the heat retaining property and the sealing property are further deteriorated. To change this state, insulation made of ceramic fibers is considered.
disclosure of Invention
the invention aims to solve the defects in the prior art and provides a ceramic fiber thermal insulation material covered with an aluminum film.
In order to achieve the purpose, the invention adopts the following technical scheme:
A ceramic fiber heat-insulating material covered with an aluminum film comprises a non-heat-receiving layer, wherein the upper surface of the non-heat-receiving layer is fixedly connected with a heat-receiving layer, and the surface of the heat-receiving layer is fixedly connected with the aluminum film; the non-heated layer is composed of the following raw materials in percentage by weight: 55% of ceramic fiber, 10% of sol binder, 8% of starch, 20% of clay and 7% of silica powder; the heat receiving layer is composed of the following raw materials in percentage by weight: 50-55% of refractory fiber, 10-15% of clay, 8% of starch, 2% of organic binder, 1% of inorganic binder, 7% of alumina powder, 4% of corundum powder, 2% of heat insulation additive and 11% of sol binder; the aluminum film is an aluminum oxide film.
Preferably, the refractory fiber is high-alumina refractory fiber, industrial alumina, high-purity silica and quartz sand are used as main raw materials, and the batch is subjected to melt blowing or wire spinning to form fiber, so that the high-purity vitreous alumina silicate refractory fiber with the alumina content of more than 60% is obtained.
Preferably, the thermal insulation additive is powdery aerogel silica, and the powdery aerogel silica is subjected to surface treatment by silicone oil to form a white suspension.
Preferably, the sol binder is composed of 85% of silica sol and 15% of sizing agent, the type of the inorganic binder is silicate binder, the organic binder is epoxy resin, and 5% of silica powder is added into the silica sol.
A preparation process of a ceramic fiber heat-insulating material covered with an aluminum film comprises the following steps:
1) respectively shortening the refractory fiber and the ceramic fiber raw cotton by a beater to ensure that the specification of the refractory fiber and the ceramic fiber raw cotton reaches ~ 12 microns multiplied by 6 mm;
2) Respectively preparing heated layer slurry and unheated layer slurry:
1. heated layer slurry: adding the chopped refractory fibers obtained in the step 1) into a homogenizer, adding clay, starch, an organic bonding agent, a heat insulation additive, corundum powder, alumina powder and a sol bonding agent, and stirring and dispersing uniformly;
2. Slurry of the unheated layer: adding the ceramic refractory fiber obtained in the step 1) into a homogenizer, adding a sol binder, starch, clay and silica powder, and uniformly stirring and dispersing;
3) Quantitatively adding the heated layer slurry stirred in advance into a forming die, flattening, then sucking and filtering, then filling the non-heated layer slurry into the die, and quantitatively and uniformly spraying the fine corundum coating on the slurry in the die by using a 100-mesh standard sieve when water is quickly sucked;
4) Turning over the mould, and conveying the mould into a drying kiln for drying by using a supporting plate, wherein the drying time is 1.5-2.5 hours, and the drying temperature is 150-;
5) and (3) polishing and flattening the heated layer of the baked heat insulation board, cutting into a target size, and plating an aluminum oxide film on the surface of the heated layer by using an RF magnetron sputtering method.
Preferably, a magnetron sputtering coating machine is adopted in the step 5), the vacuum degree is 2.0E-3Pa, and the coating technological parameters are as follows: 100W, 0.9Pa, 15sccm of Ar flow, 5sccm of O2 flow, 90mm of target distance and 90min of coating time.
the invention has the following beneficial effects:
1. in the processing technology of the ceramic fiber heat-insulating material covered with the aluminum film, the silica sol and a small amount of sizing agent are combined to ensure that bonding agents among fibers are distributed to the maximum degree when the ceramic fiber heat-insulating material is formed, the ceramic fiber heat-insulating material has higher strength at each temperature point, and due to the high potential of the sizing agent CMC, starch, fibers and fillers can generate flocculation, hydrogen bonds can be formed among the fibers and the fillers, and the bonding force is increased.
2. In the ceramic fiber heat-insulating material covered with the aluminum film, the material of the heat-receiving layer is high-aluminum refractory fiber, wherein the content of aluminum oxide reaches more than 60 percent, the heat-resistant temperature of the heat-insulating material is up to 1400 ℃, the temperature born by the heated layer of the heat-insulating material is the same as the melting point of aluminum oxide and is up to 2054 ℃ through the arrangement of the aluminum oxide thin film layer on the surface of the heat-insulating material, the heat-insulating material can be directly contacted with flame, and the sol combination mode is convenient for quick baking and continuous operation.
drawings
FIG. 1 is a schematic cross-sectional structure diagram of a ceramic fiber thermal insulation material covered with an aluminum film according to the present invention.
In the figure: 1 non-heat-receiving layer, 2 heat-receiving layer and 3 aluminium film.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
First, example section
Example 1
A ceramic fiber heat-insulating material covered with an aluminum film comprises a non-heated layer 1, wherein the upper surface of the non-heated layer 1 is fixedly connected with a heated layer 2, and the surface of the heated layer 2 is fixedly connected with an aluminum film 3; the unheated layer 1 is composed of the following raw materials in percentage by weight: 55% of ceramic fiber, 10% of sol binder, 8% of starch, 20% of clay and 7% of silica powder; the heat receiving layer 2 is composed of the following raw materials in percentage by weight: 50% of refractory fiber, 15% of clay, 8% of starch, 2% of organic binder, 1% of inorganic binder, 7% of alumina powder, 4% of corundum powder, 2% of heat insulation additive and 11% of sol binder; the aluminum film 3 is an aluminum oxide film.
The refractory fiber is high-alumina refractory fiber, industrial alumina, high-purity silica and quartz sand are used as main raw materials, a batch is melted, blown or spun into fibers to obtain the high-purity glass-state aluminum silicate refractory fiber with the alumina content of more than 60%, the heat insulation additive is powdery aerogel silicon dioxide, the powdery aerogel silicon dioxide is subjected to surface treatment by silicone oil to form white suspension, the sol bonding agent is composed of 85% of silica sol and 15% of sizing agent, the type of the inorganic bonding agent is silicate bonding agent, the organic bonding agent is epoxy resin, and 5% of silica micropowder is added into the silica sol.
A preparation process of a ceramic fiber heat-insulating material covered with an aluminum film comprises the following steps:
1) respectively shortening the refractory fiber and the raw cotton of the ceramic fiber by a beater to ensure that the specification of the refractory fiber and the raw cotton of the ceramic fiber reaches 12 mu m multiplied by 4 mm;
2) Respectively preparing heated layer slurry and unheated layer slurry:
1. heated layer slurry: adding the chopped refractory fibers obtained in the step 1) into a homogenizer, adding clay, starch, an organic bonding agent, a heat insulation additive, corundum powder, alumina powder and a sol bonding agent, and stirring and dispersing uniformly;
2. Slurry of the unheated layer: adding the ceramic refractory fiber obtained in the step 1) into a homogenizer, adding a sol binder, starch, clay and silica powder, and uniformly stirring and dispersing;
3) Quantitatively adding the heated layer slurry stirred in advance into a forming die, flattening, then sucking and filtering, then filling the non-heated layer slurry into the die, and quantitatively and uniformly spraying the fine corundum coating on the slurry in the die by using a 100-mesh standard sieve when water is quickly sucked;
4) turning over a mould, and conveying the mould into a drying kiln for drying by using a supporting plate, wherein the drying time is 1.5 hours, and the drying temperature is 200 ℃;
5) And (3) polishing and flattening the heated layer of the baked heat insulation board, cutting into a target size, and plating an aluminum oxide film on the surface of the heated layer by using an RF magnetron sputtering method.
Adopting a magnetron sputtering coating machine in the step 5), wherein the vacuum degree is 2.0E-3Pa, and the coating technological parameters are as follows: 100W, 0.9Pa, 15sccm of Ar flow, 5sccm of O2 flow, 90mm of target distance and 90min of coating time.
Example 2
A ceramic fiber heat-insulating material covered with an aluminum film comprises a non-heated layer 1, wherein the upper surface of the non-heated layer 1 is fixedly connected with a heated layer 2, and the surface of the heated layer 2 is fixedly connected with an aluminum film 3; the unheated layer 1 is composed of the following raw materials in percentage by weight: 55% of ceramic fiber, 10% of sol binder, 8% of starch, 20% of clay and 7% of silica powder; the heat receiving layer 2 is composed of the following raw materials in percentage by weight: 55% of refractory fiber, 10% of clay, 8% of starch, 2% of organic binder, 1% of inorganic binder, 7% of alumina powder, 4% of corundum powder, 2% of heat-insulating additive and 11% of sol binder; the aluminum film 3 is an aluminum oxide film.
The refractory fiber is high-alumina refractory fiber, industrial alumina, high-purity silica and quartz sand are used as main raw materials, a batch is melted, blown or spun into fibers to obtain the high-purity glass-state aluminum silicate refractory fiber with the alumina content of more than 60%, the heat insulation additive is powdery aerogel silicon dioxide, the powdery aerogel silicon dioxide is subjected to surface treatment by silicone oil to form white suspension, the sol bonding agent is composed of 85% of silica sol and 15% of sizing agent, the type of the inorganic bonding agent is silicate bonding agent, the organic bonding agent is epoxy resin, and 5% of silica micropowder is added into the silica sol.
A preparation process of a ceramic fiber heat-insulating material covered with an aluminum film comprises the following steps:
1) Respectively shortening the refractory fiber and the raw cotton of the ceramic fiber by a beater to ensure that the specification of the refractory fiber and the raw cotton of the ceramic fiber reaches 12 mu m multiplied by 5 mm;
2) Respectively preparing heated layer slurry and unheated layer slurry:
1. heated layer slurry: adding the chopped refractory fibers obtained in the step 1) into a homogenizer, adding clay, starch, an organic bonding agent, a heat insulation additive, corundum powder, alumina powder and a sol bonding agent, and stirring and dispersing uniformly;
2. slurry of the unheated layer: adding the ceramic refractory fiber obtained in the step 1) into a homogenizer, adding a sol binder, starch, clay and silica powder, and uniformly stirring and dispersing;
3) Quantitatively adding the heated layer slurry stirred in advance into a forming die, flattening, then sucking and filtering, then filling the non-heated layer slurry into the die, and quantitatively and uniformly spraying the fine corundum coating on the slurry in the die by using a 100-mesh standard sieve when water is quickly sucked;
4) Turning over a mould, and conveying the mould into a drying kiln for drying by using a supporting plate, wherein the drying time is 2 hours, and the drying temperature is 180 ℃;
5) and (3) polishing and flattening the heated layer of the baked heat insulation board, cutting into a target size, and plating an aluminum oxide film on the surface of the heated layer by using an RF magnetron sputtering method.
Adopting a magnetron sputtering coating machine in the step 5), wherein the vacuum degree is 2.0E-3Pa, and the coating technological parameters are as follows: 100W, 0.9Pa, 15sccm of Ar flow, 5sccm of O2 flow, 90mm of target distance and 90min of coating time.
Example 3
a ceramic fiber heat-insulating material covered with an aluminum film comprises a non-heated layer 1, wherein the upper surface of the non-heated layer 1 is fixedly connected with a heated layer 2, and the surface of the heated layer 2 is fixedly connected with an aluminum film 3; the unheated layer 1 is composed of the following raw materials in percentage by weight: 55% of ceramic fiber, 10% of sol binder, 8% of starch, 20% of clay and 7% of silica powder; the heat receiving layer 2 is composed of the following raw materials in percentage by weight: 53% of refractory fiber, 12% of clay, 8% of starch, 2% of organic binder, 1% of inorganic binder, 7% of alumina powder, 4% of corundum powder, 2% of heat insulation additive and 11% of sol binder; the aluminum film 3 is an aluminum oxide film.
the refractory fiber is high-alumina refractory fiber, industrial alumina, high-purity silica and quartz sand are used as main raw materials, a batch is melted, blown or spun into fibers to obtain the high-purity glass-state aluminum silicate refractory fiber with the alumina content of more than 60%, the heat insulation additive is powdery aerogel silicon dioxide, the powdery aerogel silicon dioxide is subjected to surface treatment by silicone oil to form white suspension, the sol bonding agent is composed of 85% of silica sol and 15% of sizing agent, the type of the inorganic bonding agent is silicate bonding agent, the organic bonding agent is epoxy resin, and 5% of silica micropowder is added into the silica sol.
a preparation process of a ceramic fiber heat-insulating material covered with an aluminum film comprises the following steps:
1) Respectively shortening the refractory fiber and the raw cotton of the ceramic fiber by a beater to ensure that the specification of the refractory fiber and the raw cotton of the ceramic fiber reaches 12 mu m multiplied by 6 mm;
2) Respectively preparing heated layer slurry and unheated layer slurry:
1. Heated layer slurry: adding the chopped refractory fibers obtained in the step 1) into a homogenizer, adding clay, starch, an organic bonding agent, a heat insulation additive, corundum powder, alumina powder and a sol bonding agent, and stirring and dispersing uniformly;
2. slurry of the unheated layer: adding the ceramic refractory fiber obtained in the step 1) into a homogenizer, adding a sol binder, starch, clay and silica powder, and uniformly stirring and dispersing;
3) quantitatively adding the heated layer slurry stirred in advance into a forming die, flattening, then sucking and filtering, then filling the non-heated layer slurry into the die, and quantitatively and uniformly spraying the fine corundum coating on the slurry in the die by using a 100-mesh standard sieve when water is quickly sucked;
4) Turning over the mould, and conveying the mould into a drying kiln for drying by using a supporting plate, wherein the drying time is 2.5 hours, and the drying temperature is 160 ℃;
5) and (3) polishing and flattening the heated layer of the baked heat insulation board, cutting into a target size, and plating an aluminum oxide film on the surface of the heated layer by using an RF magnetron sputtering method.
adopting a magnetron sputtering coating machine in the step 5), wherein the vacuum degree is 2.0E-3Pa, and the coating technological parameters are as follows: 100W, 0.9Pa, 15sccm of Ar flow, 5sccm of O2 flow, 90mm of target distance and 90min of coating time.
secondly, detecting data
The following data were obtained from testing the product of the above example:
| Name of itemBalance | technical index |
| bulk density | 0.25-0.4 g/cm3 |
| Degree of refractoriness | ≥1300℃ |
| Al2O3 | ≥55% |
| thermal conductivity W/m k (hot side temperature 800 ℃ C.) | ＜0.2 |
the heat-insulating material can meet the requirements of sealing and heat-insulating castings, the refractoriness meets the use requirement of the tundish, and a main bonding system of the heat-insulating material is inorganic sol. The composite material does not contain organic volatile matters in the using process, does not generate dense smoke and pungent smell, is green and environment-friendly, and is better in heat preservation performance by introducing the compounding of the powdery aerogel silicon dioxide and the ceramic fiber.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. a ceramic fibre thermal insulation material covered with aluminium film, comprising a non-heat-receiving layer (1), characterized in that: the upper surface of the non-heat-receiving layer (1) is fixedly connected with a heat-receiving layer (2), and the surface of the heat-receiving layer (2) is fixedly connected with an aluminum film (3); the non-heat-receiving layer (1) is composed of the following raw materials in percentage by weight: 55% of ceramic fiber, 10% of sol binder, 8% of starch, 20% of clay and 7% of silica powder; the heat receiving layer (2) is composed of the following raw materials in percentage by weight: 50-55% of refractory fiber, 10-15% of clay, 8% of starch, 2% of organic binder, 1% of inorganic binder, 7% of alumina powder, 4% of corundum powder, 2% of heat insulation additive and 11% of sol binder; the aluminum film (3) is an aluminum oxide film.
2. The ceramic fiber thermal insulation material covered with aluminum film as set forth in claim 1, wherein: the refractory fiber is high-alumina refractory fiber, industrial alumina, high-purity silica and quartz sand are used as main raw materials, and the batch is melted, blown or spun into fiber to obtain the high-purity glass-state aluminum silicate refractory fiber with the alumina content of more than 60 percent.
3. The ceramic fiber thermal insulation material covered with aluminum film as set forth in claim 1, wherein: the heat insulation additive is powdery aerogel silicon dioxide, and the powdery aerogel silicon dioxide is subjected to surface treatment by using silicone oil to form white suspension.
4. The ceramic fiber thermal insulation material covered with aluminum film as set forth in claim 1, wherein: the sol binder is composed of 85% of silica sol and 15% of sizing agent, the type of the inorganic binder is silicate binder, the organic binder is epoxy resin, and 5% of silica powder is added into the silica sol.
5. A preparation process of a ceramic fiber heat-insulating material covered with an aluminum film comprises the following steps:
1) Respectively shortening the refractory fiber and the ceramic fiber raw cotton by a beater to ensure that the specification of the refractory fiber and the ceramic fiber raw cotton reaches ~ 12 microns multiplied by 6 mm;
2) Respectively preparing heated layer slurry and unheated layer slurry:
1. heated layer slurry: adding the chopped refractory fibers obtained in the step 1) into a homogenizer, adding clay, starch, an organic bonding agent, a heat insulation additive, corundum powder, alumina powder and a sol bonding agent, and stirring and dispersing uniformly;
2. slurry of the unheated layer: adding the ceramic refractory fiber obtained in the step 1) into a homogenizer, adding a sol binder, starch, clay and silica powder, and uniformly stirring and dispersing;
3) Quantitatively adding the heated layer slurry stirred in advance into a forming die, flattening, then sucking and filtering, then filling the non-heated layer slurry into the die, and quantitatively and uniformly spraying the fine corundum coating on the slurry in the die by using a 100-mesh standard sieve when water is quickly sucked;
4) turning over the mould, and conveying the mould into a drying kiln for drying by using a supporting plate, wherein the drying time is 1.5-2.5 hours, and the drying temperature is 150-;
5) And (3) polishing and flattening the heated layer of the baked heat insulation board, cutting into a target size, and plating an aluminum oxide film on the surface of the heated layer by using an RF magnetron sputtering method.
6. The ceramic fiber thermal insulation material covered with aluminum film as set forth in claim 5, wherein: the step 5) adopts a magnetron sputtering coating machine, the vacuum degree is 2.0E-3Pa, and the coating technological parameters are as follows: 100W, 0.9Pa, 15sccm of Ar flow, 5sccm of O2 flow, 90mm of target distance and 90min of coating time.
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| CN114561112A (en) * | 2022-02-25 | 2022-05-31 | 淄博市产品质量检验研究院 | Moisture-proof refractory fiber spray coating and spray coating method thereof |
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