Thermal insulation barrel made of carbon-carbon composite material and used for high-temperature furnace heating body and preparation method of thermal insulation barrel

Abstract

The invention belongs to the field of high-temperature furnace heat preservation equipment, and discloses a heat preservation barrel made of a carbon-carbon composite material and used for a high-temperature furnace heating body and a preparation method thereof.The heat preservation barrel comprises a heat preservation barrel body, and the heat preservation barrel body is composed of a graphite barrel, an S316L stainless steel cover ring with an annular groove, graphite paper, a multi-layer heat preservation felt, a stainless steel outer barrel and the like; all the components are connected and fixed through high-temperature-resistant binders, carbon ropes, fixing pins and the like. The preparation method comprises the steps of material preparation, assembly, welding and the like, and the binder is prepared by taking aluminosilicate as a base material; the invention aims to provide the heat preservation barrel for the high-temperature furnace heating body made of the carbon-carbon composite material and the preparation method of the heat preservation barrel so as to solve the problems existing in the prior art. Through unique structural design and material combination, the thermal insulation barrel has excellent thermal insulation performance, structural stability and high temperature resistance; the preparation method is scientific and reasonable, and can ensure the quality and performance of the insulation barrel.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature furnace insulation equipment, and in particular to an insulation barrel for a high-temperature furnace heating body made of carbon-carbon composite material and a preparation method thereof. Background Art

[0002] In modern industrial production, high-temperature furnaces are widely used in fields such as metallurgy, chemical engineering, and material preparation, completing high-temperature processes such as metal smelting, ceramic sintering, and composite material preparation. As the core component of a high-temperature furnace, the insulation performance of the heating element is directly related to the furnace's energy efficiency, operating costs, and process stability.

[0003] Currently, most common insulation barrels for high-temperature furnace heating elements on the market utilize traditional insulation materials and structural designs. Some use fiber-based insulation materials such as rock wool and glass wool. While these materials offer some insulation benefits, they can shrink and become brittle in high-temperature environments (e.g., exceeding 800°C), leading to gaps in the insulation layer, increased heat conduction, and a significant decrease in insulation performance. Furthermore, fiber-based materials release microscopic particles during long-term high-temperature use, contaminating the furnace's internal environment and impacting product quality.

[0004] Another type of insulation barrel uses materials such as ceramic fiber felt. Although ceramic fiber felt offers superior high-temperature resistance to fiber-based insulation materials, it is relatively weak and easily breaks or falls apart when subjected to mechanical vibration or thermal stress, compromising the barrel's structural integrity. Furthermore, the insulation performance of ceramic fiber felt degrades over time, making it inadequate for the long-term, stable operation of high-temperature furnaces.

[0005] In terms of structural design, existing insulation drums often suffer from loose connections. For example, the insulation layer and the outer shell are often secured with simple bonding or bundling. This can easily loosen or separate due to the combined effects of thermal expansion and contraction at high temperatures and mechanical vibration, leading to increased heat loss. Furthermore, some insulation drums lack sealing performance, allowing significant heat leakage from the high-temperature furnace through gaps. This not only wastes energy but also poses a potential safety threat to operators.

[0006] To improve thermal insulation performance, some companies have attempted to increase the thickness of insulation materials. However, this not only increases the weight and volume of the insulation barrel, but also takes up the limited space inside the high-temperature furnace, hindering the installation and use of the heating element. Therefore, a thermal insulation barrel for a high-temperature furnace heating element, which maintains excellent thermal insulation performance in high-temperature environments, has a stable structure, and has a good sealing effect, and a preparation method thereof, has been proposed. Summary of the Invention

[0007] The present invention aims to provide a carbon-carbon composite insulation barrel for high-temperature furnace heating elements and its preparation method to address the aforementioned problems existing in the prior art. Through its unique structural design and material combination, the insulation barrel exhibits excellent thermal insulation performance, structural stability, and high-temperature resistance. Its scientific and rational preparation method ensures the barrel's quality and performance.

[0008] In order to achieve the above object, the present invention provides the following technical solutions: The technical solution provided by the present invention is: a heat preservation barrel for a high-temperature furnace heating element made of a carbon-carbon composite material, comprising: Graphite barrel with a wall thickness of 4.0 mm, an outer diameter of 300 mm, a height of 554 mm and a bottom thickness of 10 mm; A 13mm thick S316L stainless steel cover ring is installed on the top of the graphite barrel. The inner wall of the stainless steel cover ring is provided with an annular groove adapted to the top edge of the graphite barrel, and the annular groove is engaged with the top edge of the graphite barrel to position it; 0.5mm thick graphite paper is installed on the outer wall and bottom of the graphite barrel. The graphite paper is adhered to the outer wall and bottom of the graphite barrel by a high-temperature resistant adhesive made of aluminosilicate as the base material, ceramic fiber and nano-alumina particles. The temperature range of the high-temperature resistant adhesive is 1200℃-2000℃; The first, second and third layers of 10mm thick bottom circular insulation felt are arranged on the bottom of the graphite barrel from bottom to top. The diameters of the first, second and third layers of bottom circular insulation felt are 302mm, 307mm and 314mm respectively. 0.5mm thick graphite paper is laid between the first, second and third layers of bottom circular insulation felt and the bottom of the graphite barrel. The adjacent bottom circular insulation felts and graphite paper are cross-wound every 50mm through carbon ropes with a diameter of 1.5-2.0mm, and are fixed by knotting at the intersections. A fourth layer of graphite paper is provided above the circular insulation felt at the bottom of the third layer. The fourth layer of graphite paper is 0.5 mm thick and has a diameter of 344.5 mm. Three layers of 6 mm thick soft felt are placed under the fourth layer of graphite paper. The three layers of soft felt are bonded together by the above-mentioned high-temperature resistant adhesive. The 0.1mm thick stainless steel outer protective component wrapped around the outside of the graphite barrel includes a 0.1mm thick stainless steel outer cover with dimensions of 680mm x 1200mm, a 0.1mm thick stainless steel bottom gasket with a diameter of 344mm, and a 0.1mm thick stainless steel bottom bracket with a length of 465mm. The edge of the stainless steel outer cover is connected to the stainless steel bottom gasket and stainless steel bottom bracket by argon arc welding with a bending angle of 90° and a bending radius of 2mm. The welding current is 80-100A and the welding speed is 15-20mm / min. The 1.5mm thick stainless steel outer barrel is sleeved on the outside of the stainless steel outer protective component. The stainless steel outer barrel and the stainless steel cover ring are fixed by argon arc welding. The welding current is 100-120A and the welding speed is 18-25mm / min. The two are assisted by 2103.1mm brass fixing pins between the stainless steel barrel and the cover ring, and M6*7mm hexagonal stainless steel cover ring and graphite barrel fixing bolts. The brass fixing pins pass through the stainless steel outer barrel and the stainless steel cover ring, and the hexagonal fixing bolts pass through the stainless steel cover ring and are threadedly connected to the graphite barrel.

[0009] Furthermore, a bottom graphite paper with a thickness of 0.5 mm and a diameter of 344.5 mm is provided at the bottom of the graphite barrel, and the bottom graphite paper is fixed to the bottom of the graphite barrel by the above-mentioned high temperature resistant adhesive.

[0010] Furthermore, the depth of the annular groove is 5-8 mm.

[0011] Furthermore, the edge of the stainless steel outer cover is folded to form a flange structure with a width of 10-15 mm.

[0012] Furthermore, the mass fraction of the ceramic fiber in the high temperature resistant binder is 15-25%, and the mass fraction of the nano alumina particles is 10-18%.

[0013] A method for preparing a heat preservation barrel for a high-temperature furnace heating element made of a carbon-carbon composite material comprises the following steps: S1: Material preparation steps: prepare a graphite barrel with a wall thickness of 4.0mm, an outer diameter of 300mm, a height of 554mm and a bottom thickness of 10mm, a 13mm thick S316L stainless steel cover ring, a 0.5mm thick graphite paper, a 10mm thick bottom circular insulation felt with diameters of 302mm, 307mm and 314mm, a 6mm thick soft felt, a 0.1mm thick stainless steel cover with a size of 680mm×1200mm, a 0.1mm thick non- Stainless steel bottom gasket, 0.1mm thick, 465mm long stainless steel bottom bracket, 1.5mm thick stainless steel outer barrel, 2103.1mm brass fixing pins for the stainless steel barrel and lid ring, M67mm hexagon socket stainless steel lid ring and graphite barrel fixing bolts; prepare a high-temperature resistant adhesive made from aluminosilicate as a base material, added with ceramic fiber and nano-alumina particles, with a temperature range of 1200°C-2000°C; prepare a carbon rope with a diameter of 1.5-2.0mm; S2: Assembly steps: Embed the top edge of the graphite barrel into the annular groove on the inner wall of the stainless steel cover ring to complete the assembly of the graphite insulation barrel and the stainless steel cover ring. The depth of the annular groove is 5-8mm. Apply high-temperature resistant adhesive evenly on the outer wall and bottom of the graphite insulation barrel, and stick 0.5mm graphite paper. The thickness of the coating is controlled at 0.1-0.2mm. Lay the first layer of bottom circular insulation felt and corresponding graphite paper on the bottom of the graphite barrel in turn. Use carbon rope with a diameter of 1.5-2.0mm and cross it every 50mm. Wrap them together and secure them at the intersection by knotting them. Then, apply a high-temperature resistant adhesive with a thickness of 0.1-0.2mm on the top of the first layer of bottom circular insulation felt, and lay a 6mm soft insulation felt. In the same way, assemble the second and third layers of bottom circular insulation felt, graphite paper, and 6mm soft insulation felt. Lay the fourth layer of graphite paper on the third layer of bottom circular insulation felt, apply a high-temperature resistant adhesive with a thickness of 0.1-0.2mm on the bottom of the fourth layer of graphite paper, and adhere the three layers of 6mm thick soft felt in sequence. S3: Outer layer installation steps: The edge of the stainless steel outer cover is processed by a folding process with a bending angle of 90° and a bending radius of 2mm. The folded stainless steel outer cover is connected to the stainless steel bottom gasket and the stainless steel bottom bracket by argon arc welding at a welding current of 80-100A and a welding speed of 15-20mm / min to form a stainless steel outer layer protection component. The component is then wrapped around the outside of the assembled graphite barrel, and finally a 1.5mm stainless steel outer barrel is installed. S4: Welding steps: Use argon arc welding to weld the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. The welding current is controlled at 100-120A and the welding speed is 18-25mm / min. After welding is completed, the 2103.1mm stainless steel barrel and cover ring brass fixing pins are passed through the stainless steel outer barrel and the stainless steel cover ring. The M67mm hexagonal stainless steel cover ring and graphite barrel fixing bolts are passed through the stainless steel cover ring and the graphite barrel for threaded connection. S5: Post-processing step: Use a grinding wheel grinder to grind the welding mark between the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring to a surface roughness Ra ≤ 6.3μm; S6: Inspection and packaging steps: Conduct final inspection on the thermos barrel and package it after passing the inspection.

[0014] Furthermore, in the material preparation step, the high temperature resistant adhesive is prepared by the following method: The aluminosilicate base material is placed in a reactor, heated to 80-100°C, and ceramic fibers accounting for 15-25% of the mass of the aluminosilicate base material and nano-alumina particles accounting for 10-18% of the mass of the aluminosilicate base material are added in sequence at a stirring speed of 300-500 r / min, and stirring is continued for 30-60 minutes. After stirring is completed, the temperature is lowered to 40-50°C, and an organic bonding agent accounting for 5-10% of the total mass of the mixture is added, and stirring is continued for 15-25 minutes to obtain a high-temperature resistant adhesive.

[0015] Furthermore, in the material preparation step, the mass fraction of the ceramic fiber in the high-temperature resistant binder is 15-25%, and the mass fraction of the nano-alumina particles is 10-18%.

[0016] Furthermore, in the outer layer installation step, the edge of the stainless steel outer cover is folded to form a flange structure with a width of 10-15 mm.

[0017] Furthermore, in the post-processing step, the rotation speed of the grinding wheel grinder is 2800-3200 r / min.

[0018] The beneficial effects of this technical solution are: (1) The insulated barrel of the present invention adopts a multi-layer insulation structure design. The graphite paper has excellent high-temperature resistance and heat insulation properties, which can effectively block heat conduction. The circular insulation felt and soft felt at the bottom further enhance the insulation effect. The combination of multiple layers of insulation materials greatly reduces heat loss. Tests have shown that in a high-temperature environment of 1200°C, the internal heat loss rate of this insulated barrel is more than 40% lower than that of traditional insulated barrels, which can significantly improve the energy utilization efficiency of high-temperature furnaces and reduce operating costs.

[0019] (2) The annular groove on the inner wall of the stainless steel cover ring is locked and positioned with the top edge of the graphite barrel, and with the auxiliary fixation of the brass fixing pin and the hexagon socket fixing bolt, the top connection of the insulation barrel is firm and reliable; the adjacent bottom circular insulation felt and graphite paper are fixed in a specific way by carbon rope, ensuring the stability of the bottom insulation layer; the folding process of the edge of the stainless steel cover and the welding connection with other components enhance the structural strength of the entire insulation barrel shell. This structural design enables the insulation barrel to maintain its structural integrity in the environment of high temperature thermal expansion and contraction and mechanical vibration, avoiding problems such as loosening and deformation, and extending the service life of the insulation barrel.

[0020] (3) The selected S316L stainless steel has good high temperature resistance and corrosion resistance, and can work stably for a long time in high temperature environment; the high temperature resistant adhesive prepared with silicate as the base material has a temperature range of up to 1200℃-2000℃, which ensures the bonding strength of components such as graphite paper and soft felt at high temperatures; carbon-carbon composite materials such as graphite barrels and graphite paper have excellent high temperature resistance, which enables the insulation barrel to adapt to the working environment of various high temperature furnaces, broadening its application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a comparative example of the data differences of various embodiments of the heat preservation barrel for a high-temperature furnace heating element made of a carbon-carbon composite material and the preparation method thereof proposed in the present invention; Figure 2 This is a data sheet of a heat preservation barrel for a high-temperature furnace heating body made of a carbon-carbon composite material and a preparation method thereof proposed in the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The specific implementation process is as follows: Example 1: See also Figure 1-2 The present invention provides a technical solution: a heat preservation barrel for a high-temperature furnace heating element made of a carbon-carbon composite material and a preparation method thereof, comprising the following steps: S1: Material preparation Graphite barrel: wall thickness 4.0mm, outer diameter 300mm, height 554mm and bottom 10mm thick, made of high-purity graphite pressed and calcined at high temperature, with a density of 1.85g / cm³ and compressive strength ≥30MPa; S316L stainless steel cover ring: 13mm thick, with an annular groove of 5mm deep and 8mm wide on the inner wall. It is processed by CNC lathe and the material complies with GB / T24511-2017 standard. Graphite paper: 0.5mm thick, made of flake graphite that has been expanded and pressed at high temperature, with a graphite content of ≥98%, and has good flexibility and high temperature resistance; Bottom circular insulation felt: The first layer has a diameter of 302mm, the second layer has a diameter of 307mm, and the third layer has a diameter of 314mm. The thickness is 10mm. The material is high-purity alumina fiber felt with an alumina content of ≥99% and a shrinkage rate of ≤1% at 1200°C. Soft felt: 6mm thick, made of silica aerogel composite fiber felt, with a thermal conductivity of 0.015W / (m·K) at 25°C and 0.03W / (m·K) at 1200°C; Stainless steel outer protective components: 0.1mm thick, 680mm x 1200mm stainless steel cover, 0.1mm thick, 344mm diameter stainless steel bottom gasket, and 0.1mm thick, 465mm long stainless steel base, all made of S304 stainless steel and comply with GB / T3280-2015 standards; Stainless steel outer barrel: 1.5mm thick, made of S316L stainless steel, rolled by a plate rolling machine and then welded into shape; Fixing parts: 2103.1mm stainless steel barrel and cover ring brass fixing pin, M6*7mm hexagon socket stainless steel cover ring and graphite barrel fixing bolt, brass fixing pin is made of H62 brass, in line with GB / T5231-2012 standard; High-temperature resistant adhesive: 100 kg of aluminosilicate base material was placed in a reactor, heated to 80°C, and stirred at 300 r / min. 15 kg of ceramic fiber (3-5 mm in length, 5-8 μm in diameter) and 10 kg of nano-alumina particles (average particle size 50 nm) were added. Stirring was continued for 30 minutes. After stirring, the temperature was lowered to 40°C, and 5 kg of an organic adhesive (mainly phenolic resin) was added. Stirring was continued for 15 minutes to produce a high-temperature resistant adhesive. Testing showed that the adhesive strength at 1200°C was 8 MPa. Carbon rope: 1.5mm in diameter, woven from polyacrylonitrile-based carbon fibers, with a tensile strength of ≥3000MPa; S2: Assembly Steps Insert the top edge of the graphite barrel into the annular groove on the inner wall of the stainless steel cover ring. Use M6*7mm hexagonal stainless steel cover ring and graphite barrel fixing bolts for pre-fixing. The tightening torque of the bolts should be controlled at 8-10N·m. Apply 0.1mm thick high-temperature resistant adhesive evenly on the outer wall and bottom of the graphite insulation barrel. Use a scraper to apply it evenly without any gaps. Then apply 0.5mm graphite paper. After applying, use a roller to compact it and remove any air. Lay the first layer of bottom circular insulation felt and corresponding graphite paper on the bottom of the graphite barrel in sequence. Use a carbon rope with a diameter of 1.5mm, cross-wrap it every 50mm, and use double knots to fix it at the intersection. Then apply a high-temperature resistant adhesive with a thickness of 0.1mm on the top of the first layer of bottom circular insulation felt, lay a 6mm soft insulation felt, and use a roller to compact it. Assemble the second and third layers of bottom circular insulation felt, graphite paper, and 6mm insulation soft felt in the same way as above; Lay the fourth layer of graphite paper (0.5mm thick, 344.5mm in diameter) on top of the circular insulation felt at the bottom of the third layer. Apply a 0.1mm thick high-temperature resistant adhesive to the bottom of the fourth layer of graphite paper. Adhere three layers of 6mm thick soft felt in sequence. Use a roller to compact each layer of soft felt after pasting. S3: Outer layer installation steps The edge of the stainless steel cover is subjected to a folding process with a bending angle of 90° and a bending radius of 2 mm using a bending device, and a flange structure with a width of 10 mm is formed after folding; The folded stainless steel cover is connected to the stainless steel bottom gasket and stainless steel bottom bracket by argon arc welding. The welding current is set to 80A and the welding speed is 15mm / min. The welding parts are polished and derusted before welding, and the welds are cleaned after welding. After forming the stainless steel outer protective component, the component is wrapped around the outside of the assembled graphite barrel to ensure accurate positioning. Install the 1.5mm stainless steel outer barrel and adjust the position of the stainless steel outer barrel so that it fits tightly with the stainless steel outer protective component; S4: Welding step Argon arc welding is used to weld the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. The welding current is controlled at 100A, the welding speed is 18mm / min, and the welding is multi-layer and multi-pass. The thickness of each layer of weld is controlled at 1-1.5mm. After welding is completed, the 2103.1mm stainless steel barrel and cover ring brass fixing pins are inserted through the pre-processed pin holes of the stainless steel outer barrel and the stainless steel cover ring. The pin holes are processed by drilling with a tolerance of ±0.1mm; Insert the M6*7mm hexagon socket stainless steel cover ring and graphite barrel fixing bolts through the threaded holes of the stainless steel cover ring and graphite barrel, and further tighten the bolts to adjust the tightening torque to 12-15N·m; S5: Post-processing step Use a grinding wheel grinder to grind the welding marks of the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. The grinding wheel grinder speed is set to 2800r / min. A step-by-step grinding method is adopted during the grinding process. First, coarse grinding is performed to remove the larger weld height, and then fine grinding is performed to a surface roughness of Ra ≤ 6.3μm. S6: Inspection and packaging steps Perform an appearance inspection on the insulation barrel to check for surface defects and scratches. Use an infrared thermal imager to test the insulation performance of the insulation barrel. Under a constant temperature of 1200°C, check the surface temperature distribution of the barrel to ensure there are no obvious hot spots. Perform air tightness test, fill the insulation barrel with 0.1MPa compressed air, maintain the pressure for 5 minutes, and check for air leakage; After passing the inspection, the insulation barrel is wrapped with pearl cotton for protection and then packed into a customized wooden box with shockproof foam inside to ensure that the insulation barrel is not damaged during transportation; Example 1: A heat preservation barrel was prepared in strict accordance with the technical solution of the present invention. In terms of material selection, each component had clear specifications and excellent performance. For example, the graphite barrel was made of high-purity graphite, which ensured high-temperature resistance and structural strength. The S316L stainless steel cover ring was tightly engaged with the graphite barrel through a precisely machined annular groove. The high-temperature resistant adhesive was prepared according to a specific formula and process, and its bonding strength reached 8 MPa at 1200°C, providing reliable protection for the fixation of the heat preservation material. In terms of technology, the assembly steps are rigorous, and the operating specifications such as carbon rope fixing and adhesive application ensure the stability of the insulation layer; the welding parameters are precisely controlled to ensure the firm connection of stainless steel parts; the post-processing and inspection links are strict to ensure product quality; the finally prepared insulation barrel performs well in insulation performance, structural stability and high temperature resistance, verifying the feasibility and effectiveness of the technical solution of the present invention and providing a standard reference template for other embodiments.

[0024] Example 2: See also Figure 1-2 The present invention provides a technical solution: a heat preservation barrel for a high-temperature furnace heating element made of a carbon-carbon composite material and a preparation method thereof, comprising the following steps: S1: Material preparation Compared with Example 1, the main material specifications and performance requirements are basically the same, with only the following adjustments: The annular groove on the inner wall of the S316L stainless steel cover ring is 6mm deep and 8mm wide; Preparation of a high-temperature-resistant adhesive: 100 kg of aluminosilicate base material was placed in a reactor, heated to 90°C, and stirred at 400 rpm. 20 kg of ceramic fiber (3-5 mm in length, 5-8 μm in diameter) and 14 kg of nano-alumina particles (average particle size 50 nm) were added, and stirring was continued for 45 minutes. After stirring, the temperature was lowered to 45°C, and 7 kg of an organic adhesive (primarily composed of phenolic resin) was added. Stirring was continued for 20 minutes to produce a high-temperature-resistant adhesive. Testing showed that the adhesive strength at 1200°C was 9 MPa. S2-S6: Assembly, outer layer installation, welding, post-processing, inspection and packaging steps: all are the same as those in Example 1, except that the materials of this example are used in parts involving differences in material specifications, such as embedding the top edge of the graphite barrel into a 6 mm deep annular groove during assembly, and using a high-temperature resistant adhesive prepared in this example. Example 2: Based on Example 1, the preparation parameters of the high-temperature resistant adhesive and the depth of the annular groove of the stainless steel cover ring were adjusted; the addition ratio of ceramic fibers and nano-alumina particles in the adhesive was changed, and the stirring temperature, time, and amount of organic bonding agent were adjusted. The bonding strength of the adhesive at 1200°C was increased to 9 MPa, further enhancing the connection stability between the insulation materials. The depth of the annular groove of the stainless steel cover ring is increased to 6 mm, which makes the fit with the graphite barrel tighter during assembly, thereby enhancing the stability of the top structure. The remaining process steps are the same as those in Example 1, ensuring the consistency and repeatability of the preparation process. The results show that the performance of the insulation barrel can be optimized by properly adjusting the key parameters, indicating that the technical solution of the present invention has certain flexibility and optimization space, and can be adjusted according to actual needs to meet different performance requirements.

[0025] Example 3: See also Figure 1-2 The present invention provides a technical solution: a heat preservation barrel for a high-temperature furnace heating element made of a carbon-carbon composite material and a preparation method thereof, comprising the following steps: S1: Material preparation Compared with Example 1, the main material specifications and performance requirements are basically the same, with the following adjustments: The annular groove on the inner wall of the S316L stainless steel cover ring is 7mm deep and 8mm wide; The stainless steel cover is 0.1mm thick and measures 680mm x 1200mm, with the edges folded to form a 13mm wide flange structure; Preparation of a high-temperature-resistant adhesive: 100 kg of aluminosilicate base material was placed in a reactor, heated to 100°C, and stirred at 500 r / min. 25 kg of ceramic fibers (3-5 mm in length, 5-8 μm in diameter) and 18 kg of nano-alumina particles (average particle size 50 nm) were added. Stirring was continued for 60 minutes. After stirring, the temperature was lowered to 50°C, and 10 kg of an organic adhesive (primarily composed of phenolic resin) was added. Stirring was continued for 25 minutes to produce a high-temperature-resistant adhesive. Testing showed a bonding strength of 10 MPa at 1200°C. S2-S6: assembly, outer layer installation, welding, post-processing and inspection and packaging steps: all are the same as those in Example 1, except that the materials of this example are used in the parts involving different material specifications. For example, when installing the outer layer, the stainless steel outer cover is folded to a width of 13 mm. Example 3 further adjusts some parameters. The ceramic fiber and nano-alumina particles are added to the high-temperature resistant adhesive in a higher proportion, resulting in a bonding strength of 10 MPa, ensuring a long-term stable connection of the insulation material in a high-temperature environment. The annular groove of the stainless steel cover ring is 7 mm deep, and the 13 mm wide stainless steel outer cover flange structure enhances the structural strength and sealing of the insulation barrel from both the top and the outer shell. During the entire preparation process, the process method of the present invention is strictly followed and each step is carried out in place; after testing, the insulation barrel has excellent performance in structural stability and thermal insulation performance, especially in resisting high-temperature thermal stress and preventing heat leakage. It is obvious that the present invention can effectively improve the comprehensive performance of the insulation barrel by reasonably adjusting parameters and optimizing structural design; processing, etc.

[0026] Example 4: See also Figure 1-2 The present invention provides a technical solution: a heat preservation barrel for a high-temperature furnace heating element made of a carbon-carbon composite material and a preparation method thereof, comprising the following steps: S1: Material preparation Compared with Example 1, the main material specifications and performance requirements are basically the same, with the following adjustments: The annular groove on the inner wall of the S316L stainless steel cover ring is 8mm deep and 8mm wide; The stainless steel cover is 0.1mm thick and measures 680mm x 1200mm, with the edges folded to form a 15mm wide flange structure; Preparation of a high-temperature-resistant adhesive: 100 kg of aluminosilicate base material was placed in a reactor and heated to 95°C. With stirring at 450 rpm, 18 kg of ceramic fibers (3-5 mm in length, 5-8 μm in diameter) and 12 kg of nano-alumina particles (average particle size 50 nm) were added, and stirring was continued for 50 minutes. After stirring, the temperature was lowered to 48°C, and 8 kg of an organic adhesive (primarily composed of phenolic resin) was added. Stirring was continued for 22 minutes to produce a high-temperature-resistant adhesive. Testing showed a bonding strength of 9.5 MPa at 1200°C. S2-S6: Assembly, outer layer installation, welding, post-processing, inspection and packaging steps: all are the same as those in Example 1, except that the materials of this example are used in parts involving differences in material specifications, such as embedding the top edge of the graphite barrel into an annular groove with a depth of 8 mm during assembly, and folding the stainless steel outer cover to a width of 15 mm during outer layer installation. In Example 4, multiple parameters were adjusted comprehensively. The depth of the annular groove of the stainless steel cover ring reached 8 mm, and the width of the flange of the stainless steel outer cover was 15 mm. This strengthened the overall structure of the insulation barrel, made the fit between the various components tighter, and effectively reduced the possibility of heat loss through gaps. Under specific preparation parameters, the high-temperature resistant adhesive had a bonding strength of 9.5 MPa, ensuring the stability of the insulation layer. During the preparation process, each process link is strictly controlled, from material assembly to welding and post-processing, all of which meet the requirements of the invention; the finally prepared insulation barrel operates stably in a high-temperature environment, has good insulation performance and a solid structure, which shows that the technical solution of the present invention can achieve comprehensive optimization of the insulation barrel performance through coordinated adjustment of multiple parameters, and meet the diverse needs of high-temperature furnace heating bodies for insulation equipment.

[0027] Comparative Example 1 S1: Material preparation Graphite barrel: wall thickness 4.0 mm, outer diameter 300 mm, height 554 mm and bottom thickness 10 mm, same as Example 1; S316L stainless steel cover ring: 13mm thick, no annular groove, made from ordinary flat plate; Graphite paper: 0.5 mm thick, same as in Example 1; Bottom circular insulation felt: the first layer has a diameter of 302mm, the second layer has a diameter of 307mm, and the third layer has a diameter of 314mm. The thickness is 10mm and the material is the same as in Example 1. Soft felt: 6 mm thick, same as in Example 1; Stainless steel outer protective assembly: 0.1mm thick, 680mm x 1200mm stainless steel outer cover, unfolded; 0.1mm thick, 344mm diameter stainless steel bottom gasket; 0.1mm thick, 465mm long stainless steel bottom bracket, made of the same material as in Example 1; Stainless steel outer barrel: 1.5mm thick, made of the same material as in Example 1; Fixing parts: 2103.1mm brass fixing pins for the stainless steel barrel and the cover ring, M6*7mm hexagon socket fixing bolts for the stainless steel cover ring and the graphite barrel, the same as in Example 1; Adhesive: Use common high-temperature resistant silicone glue on the market. Its temperature resistance range is 200-600℃. Carbonization failure will occur at 1200℃. The bonding strength is 3MPa at room temperature. Carbon rope: diameter 1.5 mm, same as in Example 1; S2-S6: assembly, outer layer installation, welding, post-processing and inspection packaging steps Place the graphite barrel in direct contact with the stainless steel cover ring, and use M6*7mm hexagonal stainless steel cover ring to connect the graphite barrel fixing bolts. The bolt tightening torque is controlled at 8-10N·m. Apply ordinary high-temperature resistant silicone glue evenly on the outer wall and bottom of the graphite insulation barrel, paste 0.5mm graphite paper, and use a roller to compact it after pasting; Lay the first layer of bottom circular insulation felt and corresponding graphite paper on the bottom of the graphite barrel in sequence. Use a carbon rope with a diameter of 1.5mm, cross-wrap it every 50mm, and tie knots at the intersections to fix it. Then apply ordinary high-temperature resistant silicone glue on the top of the first layer of bottom circular insulation felt, lay 6mm insulation soft felt, and compact it with a roller. Assemble the second and third layers of bottom circular insulation felt, graphite paper, and 6mm insulation soft felt in the same way as above; Lay the fourth layer of graphite paper on top of the circular insulation felt at the bottom of the third layer. Apply ordinary high-temperature resistant silicone glue to the bottom of the fourth layer of graphite paper. Adhere three layers of 6mm thick soft felt in sequence. Use a pressure roller to compact each layer of soft felt after pasting. The stainless steel outer cover is directly welded to the stainless steel bottom gasket and the stainless steel bottom bracket. The welding current is set to 80A and the welding speed is 15mm / min. The welding parts are polished and rust-removed before welding. The welds are cleaned after welding. After forming the stainless steel outer layer protection component, the component is wrapped around the outside of the assembled graphite barrel and a 1.5mm stainless steel outer barrel is installed. Use argon arc welding to weld the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. The welding current is controlled at 100A and the welding speed is 18mm / min. After welding, the 2103.1mm stainless steel barrel and cover ring brass fixing pins are passed through the stainless steel outer barrel and the stainless steel cover ring. The M6*7mm inner hexagon stainless steel cover ring and graphite barrel fixing bolts are passed through the stainless steel cover ring and the graphite barrel for threaded connection. Use a grinding wheel grinder to grind the welding mark between the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. Set the grinding wheel grinder speed to 2800r / min and grind until the surface roughness Ra ≤ 6.3μm. The insulation barrel is inspected for appearance, tested for insulation performance using an infrared thermal imager, and tested for air tightness. Once qualified, the insulation barrel is wrapped with pearl cotton for protection and then packed into a customized wooden box. Compared with the embodiment, Comparative Example 1 has undergone significant changes in structural design and material selection. The stainless steel cover ring is not provided with an annular groove, so the connection between the graphite barrel and the cover ring relies solely on bolts, which greatly reduces stability. The stainless steel outer cover is not folded, which reduces the structural strength and sealing of the shell. Ordinary high-temperature resistant silicone glue carbonizes and fails at 1200°C, and cannot effectively fix the insulation material. These changes cause the insulation material of the insulation barrel to fall off in a high-temperature environment, resulting in a large amount of heat loss and poor air tightness, which cannot meet the use requirements of high-temperature furnace heating bodies. By comparison with the embodiments, the importance of the annular groove, folding structure and specific high-temperature resistant adhesive in the present invention for ensuring the performance of the insulation barrel is highlighted, proving the innovation and necessity of the technical solution of the present invention in structural design and material selection.

[0028] Comparative Example 2 S1: Material preparation Graphite barrel: wall thickness 4.0 mm, outer diameter 300 mm, height 554 mm and bottom thickness 10 mm, same as Example 1; S316L stainless steel cover ring: 13mm thick, with a 5mm deep annular groove on the inner wall, but no brass fixing pins or hexagon socket fixing bolts are used for auxiliary fixing; Graphite paper: 0.5 mm thick, same as in Example 1; Bottom circular insulation felt: the first layer has a diameter of 302mm, the second layer has a diameter of 307mm, and the third layer has a diameter of 314mm. The thickness is 10mm and the material is the same as in Example 1. Soft felt: 6 mm thick, same as in Example 1; Stainless steel outer protective assembly: a 0.1mm thick stainless steel outer cover, 680mm x 1200mm in size, with the edges folded to form a 10mm wide flange structure; a 0.1mm thick stainless steel bottom gasket, 344mm in diameter; a 0.1mm thick stainless steel bottom bracket, 465mm in length, made of the same material as in Example 1; Stainless steel outer barrel: 1.5mm thick, made of the same material as in Example 1; Fixing parts: Only M6*7mm hexagonal stainless steel cover ring and graphite barrel fixing bolts are used, and brass fixing pins are not used; High-temperature resistant adhesive: 100 kg of aluminosilicate base material was placed in a reactor, heated to 80°C, and 15 kg of ceramic fiber (3-5 mm in length, 5-8 μm in diameter) and 10 kg of nano-alumina particles (average particle size 50 nm) were added while stirring at a speed of 300 r / min. Stirring was continued for 30 minutes. After stirring, the temperature was lowered to 40°C, but no organic bonding agent was added. The high-temperature resistant adhesive was directly prepared. Testing showed that its bonding strength at 1200°C was only 4 MPa. Carbon rope: 1.5 mm in diameter, woven from polyacrylonitrile-based carbon fibers, with a tensile strength of ≥3000 MPa, the same as in Example 1; S5: Assembly Step Insert the top edge of the graphite barrel into the annular groove on the inner wall of the stainless steel cover ring. Use only the M6*7mm hexagonal stainless steel cover ring and the graphite barrel fixing bolts to fix them. The tightening torque of the bolts should be controlled within 8-10N·m. Apply the above-mentioned high-temperature resistant adhesive evenly with a thickness of 0.1mm on the outer wall and bottom of the graphite insulation barrel, apply it with a scraper, and stick 0.5mm graphite paper on it. After sticking, use a roller to compact it and remove air. Lay the first layer of bottom circular insulation felt and corresponding graphite paper on the bottom of the graphite barrel in sequence. Use a carbon rope with a diameter of 1.5mm, cross-wrap it every 50mm, and use double knots to fix it at the intersection. Then apply a high-temperature resistant adhesive with a thickness of 0.1mm on the top of the first layer of bottom circular insulation felt, lay a 6mm soft insulation felt, and use a roller to compact it. Assemble the second and third layers of bottom circular insulation felt, graphite paper, and 6mm insulation soft felt in the same way as above; Lay the fourth layer of graphite paper (0.5mm thick, 344.5mm in diameter) on top of the circular insulation felt at the bottom of the third layer. Apply a 0.1mm thick high-temperature resistant adhesive to the bottom of the fourth layer of graphite paper. Adhere three layers of 6mm thick soft felt in sequence. Use a roller to compact each layer of soft felt after pasting. S3: Outer layer installation steps The edge of the stainless steel cover is subjected to a folding process with a bending angle of 90° and a bending radius of 2 mm using a bending device, and a flange structure with a width of 10 mm is formed after folding; The folded stainless steel cover is connected to the stainless steel bottom gasket and stainless steel bottom bracket by argon arc welding. The welding current is set to 80A and the welding speed is 15mm / min. The welding parts are polished and derusted before welding, and the welds are cleaned after welding. After forming the stainless steel outer protective component, the component is wrapped around the outside of the assembled graphite barrel to ensure accurate positioning. Install the 1.5mm stainless steel outer barrel and adjust the position of the stainless steel outer barrel so that it fits tightly with the stainless steel outer protective component; S4: Welding step Argon arc welding is used to weld the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. The welding current is controlled at 100A, the welding speed is 18mm / min, and the welding is multi-layer and multi-pass. The thickness of each layer of weld is controlled at 1-1.5mm. S5: Post-processing step Use a grinding wheel grinder to grind the welding marks of the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. The grinding wheel grinder speed is set to 2800r / min. A step-by-step grinding method is adopted during the grinding process. First, coarse grinding is performed to remove the larger weld height, and then fine grinding is performed to a surface roughness of Ra ≤ 6.3μm. S6: Inspection and packaging steps The insulation barrel was visually inspected for surface defects and scratches. An infrared thermal imager was used to test the insulation performance of the insulation barrel. The surface temperature distribution of the barrel was measured at a constant temperature of 1200°C. It was found that due to insufficient bonding strength of the adhesive, some of the graphite paper had warped edges, resulting in localized temperature increases and reduced insulation performance. To test air tightness, fill the insulation barrel with 0.1MPa compressed air, maintain the pressure for 5 minutes, and check for leaks. Because the stainless steel cover ring lacks brass fixing pins and hexagon socket fixing bolts for auxiliary fixation, a slight leak was found at the top of the barrel during the pressure maintenance process. Because the test did not fully meet the standards, the insulation barrel was repaired and re-inspected. After passing the test, it was wrapped with pearl cotton for protection and then packed into a customized wooden box with shock-proof foam inside to ensure that the insulation barrel would not be damaged during transportation. Comparative Example 2 partially abandoned the key technical points of the present invention; brass fixing pins and hexagon socket fixing bolts were not used for auxiliary fixation, resulting in insufficient connection strength between the stainless steel cover ring and the graphite barrel, and slight air leakage occurred during the air tightness test; the high-temperature resistant adhesive did not add an organic bonding agent, and the bonding strength was only 4 MPa, which was far lower than the level of the embodiment, causing some graphite paper to warp at high temperatures and reduce thermal insulation performance; Although other parts of the process are similar to the embodiments, the lack of key technologies seriously affects the performance of the insulation barrel, which shows that the auxiliary fixing structure and the complete formula of the high-temperature resistant adhesive in the present invention are key elements to ensure the structural stability and insulation performance of the insulation barrel, and neither of them can be missing, which further reflects the integrity and scientific nature of the technical solution of the present invention.

[0029] Comparative Example 3 S1: Material preparation: Graphite barrel: wall thickness 4.0 mm, outer diameter 300 mm, height 554 mm, and bottom thickness 10 mm, the same as in Example 1; S316L stainless steel cover ring: 13mm thick, with a 5mm deep annular groove on the inner wall, and brass fixing pins and hexagon socket fixing bolts are used to assist in fixing. However, the stainless steel cover ring is made of ordinary carbon steel. Graphite paper: 0.5 mm thick, same as in Example 1; Bottom circular insulation felt: the first layer has a diameter of 302mm, the second layer has a diameter of 307mm, and the third layer has a diameter of 314mm. The thickness is 10mm and the material is the same as in Example 1. Soft felt: 6 mm thick, same as in Example 1; Stainless steel outer protective assembly: a 0.1mm thick stainless steel outer cover, 680mm x 1200mm in size, with the edges folded to form a 10mm wide flange structure; a 0.1mm thick stainless steel bottom gasket, 344mm in diameter; a 0.1mm thick stainless steel bottom bracket, 465mm in length, made of the same material as in Example 1; Stainless steel outer barrel: 1.5mm thick, the material is replaced with ordinary carbon steel; Fixing parts: 2103.1mm brass fixing pins for the stainless steel barrel and the cover ring, M6*7mm hexagon socket fixing bolts for the stainless steel cover ring and the graphite barrel, the same as in Example 1; High-temperature-resistant adhesive: 100 kg of aluminosilicate base material was placed in a reactor, heated to 80°C, and stirred at 300 r / min. 15 kg of ceramic fiber (3-5 mm in length, 5-8 μm in diameter) and 10 kg of nano-alumina particles (average particle size 50 nm) were added, and stirring was continued for 30 minutes. After stirring, the temperature was lowered to 40°C, and 5 kg of an organic bonding agent (primarily composed of phenolic resin) was added. Stirring was continued for 15 minutes to produce a high-temperature-resistant adhesive. Testing showed that the bonding strength of the adhesive at 1200°C was 8 MPa, the same as in Example 1. Carbon rope: 1.5 mm in diameter, woven from polyacrylonitrile-based carbon fibers, with a tensile strength of ≥3000 MPa, the same as in Example 1; S2: Assembly steps: Insert the top edge of the graphite barrel into the annular groove on the inner wall of the stainless steel cover ring. Use M67mm hexagonal stainless steel cover ring and graphite barrel fixing bolts to pre-fix them. The bolt tightening torque is controlled at 8-10N·m. Then, insert the 210*3.1mm stainless steel barrel and cover ring brass fixing pins through the pre-machined pin holes of the stainless steel outer barrel and stainless steel cover ring. Apply 0.1mm thick high-temperature resistant adhesive evenly on the outer wall and bottom of the graphite insulation barrel. Use a scraper to apply it evenly without any gaps. Then apply 0.5mm graphite paper. After applying, use a roller to compact it and remove any air. Lay the first layer of bottom circular insulation felt and corresponding graphite paper on the bottom of the graphite barrel in sequence. Use a carbon rope with a diameter of 1.5mm, cross-wrap it every 50mm, and use double knots to fix it at the intersection. Then apply a high-temperature resistant adhesive with a thickness of 0.1mm on the top of the first layer of bottom circular insulation felt, lay a 6mm soft insulation felt, and use a roller to compact it. Assemble the second and third layers of bottom circular insulation felt, graphite paper, and 6mm insulation soft felt in the same way as above; Lay the fourth layer of graphite paper (0.5mm thick, 344.5mm in diameter) on top of the circular insulation felt at the bottom of the third layer. Apply a 0.1mm thick high-temperature resistant adhesive to the bottom of the fourth layer of graphite paper. Adhere three layers of 6mm thick soft felt in sequence. Use a roller to compact each layer of soft felt after pasting. S3: Outer layer installation step: The edge of the stainless steel outer cover is bent by a bending machine with a bending angle of 90° and a bending radius of 2mm to form a flange structure with a width of 10mm; The folded stainless steel cover is connected to the stainless steel bottom gasket and stainless steel bottom bracket by argon arc welding. The welding current is set to 80A and the welding speed is 15mm / min. The welding parts are polished and derusted before welding, and the welds are cleaned after welding. After forming the stainless steel outer protective component, the component is wrapped around the outside of the assembled graphite barrel to ensure accurate positioning. Install the 1.5mm ordinary carbon steel outer barrel and adjust the position of the outer barrel so that it fits tightly with the stainless steel outer protective component; S4: Welding step: arc welding is used to weld the 1.5mm ordinary carbon steel outer barrel and the 13mm ordinary carbon steel cover ring. The welding current is controlled at 120A, the welding speed is 20mm / min, and the welding is multi-layer multi-pass welding. The thickness of each layer of weld is controlled at 1-1.5mm. After welding is completed, further tighten the M6*7mm hexagonal stainless steel cover ring and the graphite barrel fixing bolts, and adjust the tightening torque to 12-15N·m; S5: Post-processing step: Use a grinding wheel grinder to grind the weld mark between the 1.5mm ordinary carbon steel outer barrel and the 13mm ordinary carbon steel cover ring. The grinding wheel grinder speed is set to 2800r / min. A step-by-step grinding method is adopted during the grinding process. First, coarse grinding is performed to remove the larger weld height, and then fine grinding is performed to a surface roughness of Ra ≤ 6.3μm. Carry out anti-rust treatment on the welding parts and spray a layer of anti-rust paint; S6: Packaging Inspection Step: Perform an appearance inspection on the insulation barrel to check for surface defects and scratches. Use an infrared thermal imager to test the insulation performance of the insulation barrel. Measure the surface temperature distribution of the barrel under a constant temperature of 1200°C. Since ordinary carbon steel conducts heat quickly at high temperatures, the surface temperature of the barrel is significantly higher than that of the insulation barrel in the embodiment, indicating poor insulation performance. Perform air tightness test, fill the insulation barrel with 0.1MPa compressed air, maintain the pressure for 5 minutes, and check for leakage. The air tightness is good; After passing the inspection, the insulation barrel is wrapped with pearl cotton for protection and then packed into a customized wooden box with shockproof foam inside to ensure that the insulation barrel is not damaged during transportation; Comparative Example 3 mainly changed the material, replacing the stainless steel cover ring and outer barrel with ordinary carbon steel. Although the structural design and assembly process were consistent with the embodiment as much as possible, the high thermal conductivity and poor high-temperature resistance of ordinary carbon steel caused the surface temperature of the barrel to rise significantly at 1200°C, significantly reducing the insulation performance. This shows that the choice of materials plays a decisive role in the performance of the thermos barrel. The use of specific materials such as S316L stainless steel in the present invention is an important guarantee for achieving excellent thermal insulation performance and high temperature resistance. It highlights the rationality and advancement of the material selection of the present invention, as well as the essential difference from the existing conventional material application.

[0030] See also Figure 1-2 : In the embodiment, the annular groove provided on the inner wall of the stainless steel cover ring is precisely engaged with the top edge of the graphite barrel. This design provides basic stability for the top connection of the insulation barrel; on this basis, the auxiliary fixation of the brass fixing pin and the hexagonal fixing bolt further enhances the reliability of the connection; in actual application, this multiple fixing method can effectively resist the influence of thermal expansion and contraction and mechanical vibration in a high temperature environment, ensuring that the structure of the insulation barrel will not loosen during long-term use; for example, in Examples 1-4, by setting the annular groove depth between 5-8mm with different settings and using fixings, the graphite barrel and the stainless steel cover ring are tightly combined, and they all perform well in the air tightness test, with extremely small internal gas leakage.

[0031] In contrast, in Comparative Example 1, there is no annular groove for the stainless steel cover ring, and the graphite barrel and the cover ring are connected only by bolts. This simple connection method is difficult to ensure the stability of the connection when facing high temperature and vibration; in the simulated high temperature environment test, obvious gaps appeared on the top of the insulation barrel of Comparative Example 1, resulting in a large amount of heat loss, and the internal gas was also prone to leakage, seriously affecting the performance of the insulation barrel; although Comparative Example 2 was provided with an annular groove, the auxiliary fixation of the brass fixing pin and the hexagon socket fixing bolt was abandoned. In actual use, the problem of insufficient connection strength also occurred, and slight air leakage occurred during the air tightness test, which greatly reduced the sealing of the insulation barrel.

[0032] In addition, in the embodiment, the edge of the stainless steel outer cover adopts a folding process with a specific angle (90°) and radius (2mm) to form a flange structure with a width of 10-15mm. This design greatly enhances the structural strength and sealing of the shell; the folded stainless steel outer cover is connected to the stainless steel bottom gasket and the stainless steel bottom support by argon arc welding to form a solid integral shell, which can effectively reduce the possibility of heat leakage from the edge; while the stainless steel outer cover of comparative example 1 is not folded, the structural strength of its shell is relatively weak. In a high temperature environment, heat can easily dissipate through the gaps at the edge, and the thermal insulation performance is significantly reduced.

[0033] By comparing the structural designs of the embodiments and the comparative examples, it can be clearly seen that the unique structural design of the present technology connects from the top to the outer shell protection, which comprehensively improves the structural stability and sealing of the insulation barrel, effectively solving the problems of loose structural connection and poor sealing performance of the existing insulation barrel, and provides a more reliable insulation equipment for the high-temperature furnace heating body.

[0034] The S316L stainless steel selected in the embodiment has good high temperature resistance and corrosion resistance. Its chemical composition and physical properties enable it to work stably for a long time in a high temperature environment and is not prone to deformation and corrosion. This material is used to make the stainless steel cover ring and the stainless steel outer barrel, providing a sturdy and durable external structure for the insulation barrel. In a high temperature environment simulation test of 1200°C, the insulation barrel of the embodiment using S316L stainless steel components did not show obvious deformation and performance degradation, ensuring the integrity of the overall structure of the insulation barrel.

[0035] For the core insulation material, the embodiment uses high-performance materials such as graphite paper, high-purity alumina fiber felt, and silica aerogel composite fiber felt; graphite paper has good high-temperature resistance and heat insulation properties, and can effectively block heat conduction; high-purity alumina fiber felt and silica aerogel composite fiber felt further enhance the insulation effect, and the combined use of multiple layers of insulation materials greatly reduces heat loss; after testing, under a high temperature environment of 1200°C, the heat loss rate inside the insulation barrel of the embodiment is reduced by more than 40% compared with the traditional insulation barrel.

[0036] The selection and preparation of high-temperature resistant adhesives is a highlight of this technology. The high-temperature resistant adhesive in the embodiment is based on aluminosilicate. By adding a specific proportion of ceramic fibers and nano-alumina particles, and combining with organic bonding additives, and undergoing a precisely controlled preparation process, its bonding strength at 1200°C can reach 8-10MPa. This high-performance adhesive can ensure that thermal insulation materials such as graphite paper and soft felt are firmly fixed in high-temperature environments without falling off.

[0037] In contrast, the comparative example has obvious defects in material selection; Comparative Example 3 replaces the stainless steel cover ring and outer barrel with ordinary carbon steel. Ordinary carbon steel has fast thermal conductivity and poor high-temperature resistance. In a high-temperature environment, heat will be quickly conducted away through the ordinary carbon steel components, resulting in a significant reduction in the thermal insulation performance of the insulation barrel; in the same 1200°C high-temperature test, the surface temperature of the insulation barrel of Comparative Example 3 is significantly higher than that of the embodiment, and heat loss is serious; the ordinary high-temperature resistant silicone glue used in Comparative Example 1 has a temperature resistance range of only 200-600°C. It will carbonize and fail at 1200°C and cannot effectively fix the insulation material, causing the insulation material to fall off when the insulation barrel is used at high temperature, and the insulation performance is completely lost; the high-temperature resistant adhesive in Comparative Example 2 does not add organic bonding additives, and the bonding strength is only 4MPa, which is far lower than the level of the embodiment, and similarly cannot guarantee the stable connection of the insulation material.

[0038] In summary, this technology has achieved a comprehensive breakthrough in the insulation performance and high-temperature resistance of the insulation barrel through careful selection and optimization of materials, especially the performance improvement of key materials and the innovative formulation of adhesives. Compared with existing technologies, it has obvious advantages and can better meet the stringent requirements of high-temperature furnace heating bodies for insulation equipment.

[0039] In the material preparation stage, the examples clearly stipulate the specifications and performance of each material, and for the preparation of high-temperature resistant adhesives, the parameters such as raw material ratio, reaction temperature, stirring speed and time are described in detail; the aluminosilicate base material is heated to 80-100°C, and ceramic fibers and nano-alumina particles are added in specific proportions at different stirring speeds. After stirring for a certain period of time, the temperature is lowered and an organic bonding agent is added and stirring is continued. Through such a precise preparation process, the high-temperature resistant adhesive obtained has stable performance and the bonding strength meets the requirements; this strict control of material and adhesive preparation has laid a solid foundation for the subsequent assembly and performance realization of the insulation barrel.

[0040] In the assembly steps, the embodiment has detailed standards for each operation link; from the assembly of the graphite barrel and the stainless steel cover ring, to the laying and fixing of the insulation material, to the bonding between the various components, all are carried out strictly in accordance with the prescribed process; for example, when fixing the bottom circular insulation felt and graphite paper, a carbon rope with a diameter of 1.5-2.0 mm is used, and a cross-wrap is performed every 50 mm, and knotted and fixed at the intersection to ensure the stability of the insulation layer; when applying the high-temperature resistant adhesive, the coating thickness is precisely controlled to ensure that the insulation material is firmly and evenly adhered.

[0041] The outer layer installation and welding steps also reflect the scientific nature of the preparation process of this technology; the folding process parameters of the stainless steel outer cover are clear, and when welding by argon arc welding, the welding current, speed and other parameters are precisely set to ensure the connection quality of the stainless steel outer layer protection component and the stainless steel outer barrel; when welding the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring, multi-layer and multi-pass welding is used, and the thickness of each layer of weld is controlled at 1-1.5mm to ensure that the welding part is firm and beautiful; in the post-processing step, there are also strict standards for grinding the welding marks, and a grinding wheel grinder is used to grind to a surface roughness of Ra≤6.3μm, ensuring the appearance quality and structural strength of the insulation barrel.

[0042] In comparison, the comparative examples have many deficiencies in the preparation process; Comparative Example 1 uses ordinary high-temperature resistant silicone glue that is not suitable for high-temperature environments, and does not follow the preparation process of the high-performance adhesive in this technology, resulting in the inability of the insulation material to be stably fixed at high temperatures; although Comparative Example 2 uses some of the same materials, no organic bonding aid is added during the preparation of the adhesive, resulting in the adhesive performance not meeting the standards; Comparative Example 3 uses arc welding instead of argon arc welding during welding, and does not precisely control the welding parameters, affecting the connection quality of the stainless steel parts; these process defects make the insulation barrel prepared in the comparative example incomparable to the embodiment in performance, and various problems are prone to occur in high-temperature environments.

[0043] This technology uses a scientific and reasonable preparation process to precisely control each link such as material preparation, assembly, welding, and post-processing, thereby ensuring the quality consistency and performance stability of the thermos barrel; whether it is the thermal insulation performance and structural stability in a high-temperature environment, or the reliability during long-term use, the thermos barrel prepared in the embodiment performs well and has good practical value and promotion significance.

[0044] The above is only an embodiment of the present invention, and common knowledge such as the specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A heat preservation barrel for a high temperature furnace heating element made of carbon-carbon composite material, characterized in that: include: Graphite barrel with a wall thickness of 4.0 mm, an outer diameter of 300 mm, a height of 554 mm and a bottom thickness of 10 mm; A 13mm thick S316L stainless steel cover ring is sleeved on the top of the graphite barrel. The inner wall of the stainless steel cover ring is provided with an annular groove adapted to the top edge of the graphite barrel, and the annular groove is engaged with the top edge of the graphite barrel to position the ring; 0.5mm thick graphite paper is provided on the outer wall and bottom of the graphite barrel. The graphite paper is adhered to the outer wall and bottom of the graphite barrel by a high-temperature resistant adhesive made of aluminosilicate as a base material, ceramic fiber, and nano-alumina particles. The high-temperature resistant adhesive has a temperature resistance range of 1200°C to 2000°C; The first, second, and third layers of 10 mm thick bottom circular insulation felt are sequentially arranged on the bottom of the graphite barrel from bottom to top, and the diameters of the first, second, and third layers of bottom circular insulation felt are 302 mm, 307 mm, and 314 mm, respectively. 0.5 mm thick graphite paper is laid between the first, second, and third layers of bottom circular insulation felt and the bottom of the graphite barrel, and adjacent bottom circular insulation felts and graphite paper are cross-wound with carbon ropes with a diameter of 1.5-2.0 mm at intervals of 50 mm, and are fixed at the intersections by knotting; A fourth layer of graphite paper is provided above the circular insulation felt at the bottom of the third layer, wherein the fourth layer of graphite paper is 0.5 mm thick and has a diameter of 344.5 mm. Three layers of 6 mm thick soft felt are provided at the bottom of the fourth layer of graphite paper, and the three layers of soft felt are bonded together by the above-mentioned high temperature resistant adhesive; A 0.1 mm thick stainless steel outer protective component wrapped around the outside of the graphite barrel, the stainless steel outer protective component comprising a 0.1 mm thick stainless steel outer cover measuring 680 mm x 1200 mm, a 0.1 mm thick stainless steel bottom gasket with a diameter of 344 mm, and a 0.1 mm thick stainless steel bottom bracket with a length of 465 mm. The edge of the stainless steel outer cover is connected to the stainless steel bottom gasket and the stainless steel bottom bracket by argon arc welding with a bending angle of 90° and a bending radius of 2 mm. The welding current is 80-100 A and the welding speed is 15-20 mm / min. A 1.5mm thick stainless steel outer barrel is sleeved on the outside of the stainless steel outer protective assembly. The stainless steel outer barrel and the stainless steel cover ring are fixed by argon arc welding. The welding current is 100-120A and the welding speed is 18-25mm / min. The two are assisted by 2103.1mm brass fixing pins between the stainless steel barrel and the cover ring, and M6*7mm hexagonal stainless steel cover ring and graphite barrel fixing bolts. The brass fixing pin passes through the stainless steel outer barrel and the stainless steel cover ring, and the hexagonal fixing bolt passes through the stainless steel cover ring and is threadedly connected to the graphite barrel.

2. The heat preservation barrel for a high-temperature furnace heating element made of carbon-carbon composite material according to claim 1, characterized in that: The bottom of the graphite barrel is also provided with a bottom graphite paper with a thickness of 0.5 mm and a diameter of 344.5 mm. The bottom graphite paper is fixed to the bottom of the graphite barrel by the above-mentioned high temperature resistant adhesive.

3. The heat preservation barrel for a high-temperature furnace heating element made of carbon-carbon composite material according to claim 1, characterized in that: The depth of the annular groove is 5-8 mm.

4. The heat preservation barrel for a high-temperature furnace heating element made of carbon-carbon composite material according to claim 1, characterized in that: The edge of the stainless steel outer cover is folded to form a flange structure with a width of 10-15 mm.

5. The heat preservation barrel for a high temperature furnace heating element made of carbon-carbon composite material according to claim 1, characterized in that: The mass fraction of ceramic fibers in the high-temperature resistant binder is 15-25%, and the mass fraction of nano-alumina particles is 10-18%.

6. A method for preparing an insulation barrel for a high-temperature furnace heating element made of the carbon-carbon composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Material preparation steps: Prepare a graphite barrel with a wall thickness of 4.0mm, an outer diameter of 300mm, a height of 554mm and a bottom thickness of 10mm, a 13mm thick S316L stainless steel cover ring, a 0.5mm thick graphite paper, a 10mm thick bottom circular insulation felt with diameters of 302mm, 307mm, and 314mm, a 6mm thick soft felt, a 0.1mm thick stainless steel cover with a size of 680mm×1200mm, a 0.1mm thick stainless steel with a diameter of 344mm, and a 10mm thick bottom circular insulation felt. A steel bottom gasket, a 0.1mm thick, 465mm long stainless steel base, a 1.5mm thick stainless steel outer barrel, 2103.1mm brass fixing pins for the stainless steel barrel and lid ring, and M67mm hexagon socket bolts for fixing the stainless steel lid ring and graphite barrel; a high-temperature resistant adhesive made from aluminosilicate with ceramic fibers and nano-alumina particles, with a temperature resistance range of 1200°C to 2000°C; and a carbon rope with a diameter of 1.5-2.0mm. S2: Assembly steps: embed the top edge of the graphite barrel into the annular groove on the inner wall of the stainless steel cover ring to complete the assembly of the graphite insulation barrel and the stainless steel cover ring. The depth of the annular groove is 5-8mm; evenly apply high-temperature resistant adhesive on the outer wall and bottom of the graphite insulation barrel, and paste 0.5mm graphite paper with a thickness of 0.1-0.2mm; lay the first layer of bottom circular insulation felt and corresponding graphite paper on the bottom of the graphite barrel in turn, use a carbon rope with a diameter of 1.5-2.0mm, and cross it every 50mm. Wrap them in a cross-wrap and secure them at the intersection by knotting them. Then, apply a high-temperature resistant adhesive with a thickness of 0.1-0.2mm on the top of the first layer of bottom circular insulation felt, and lay a 6mm soft insulation felt. In the same way, assemble the second and third layers of bottom circular insulation felt, graphite paper, and 6mm soft insulation felt. Lay the fourth layer of graphite paper on the top of the third layer of bottom circular insulation felt, apply a high-temperature resistant adhesive with a thickness of 0.1-0.2mm on the bottom of the fourth layer of graphite paper, and adhere three layers of 6mm thick soft felt in sequence. S3: Outer layer installation steps: The edge of the stainless steel outer cover is processed by a folding process with a bending angle of 90° and a bending radius of 2mm. The folded stainless steel outer cover is connected to the stainless steel bottom gasket and the stainless steel bottom bracket by argon arc welding at a welding current of 80-100A and a welding speed of 15-20mm / min to form a stainless steel outer layer protection component. The component is then wrapped around the outside of the assembled graphite barrel, and finally a 1.5mm stainless steel outer barrel is installed. S4: Welding steps: Use argon arc welding to weld the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring. The welding current is controlled at 100-120A and the welding speed is 18-25mm / min. After welding is completed, the 2103.1mm stainless steel barrel and cover ring brass fixing pins are passed through the stainless steel outer barrel and the stainless steel cover ring. The M67mm hexagonal stainless steel cover ring and graphite barrel fixing bolts are passed through the stainless steel cover ring and the graphite barrel for threaded connection. S5: Post-processing step: Use a grinding wheel grinder to grind the welding mark between the 1.5mm stainless steel barrel and the 13mm stainless steel cover ring to a surface roughness Ra ≤ 6.3μm; S6: Inspection and packaging steps: Conduct final inspection on the thermos barrel and package it after passing the inspection.

7. The preparation method according to claim 6, characterized in that In the material preparation step, the high temperature resistant adhesive is prepared by the following method: The aluminosilicate base material is placed in a reactor, heated to 80-100°C, and ceramic fibers accounting for 15-25% of the mass of the aluminosilicate base material and nano-alumina particles accounting for 10-18% of the mass of the aluminosilicate base material are added in sequence at a stirring speed of 300-500 r / min, and stirring is continued for 30-60 minutes. After stirring is completed, the temperature is lowered to 40-50°C, an organic bonding agent accounting for 5-10% of the total mass of the mixture is added, and stirring is continued for 15-25 minutes to obtain the high-temperature resistant adhesive.

8. The preparation method according to claim 6, characterized in that In the material preparation step, the mass fraction of the ceramic fibers in the high-temperature resistant binder is 15-25%, and the mass fraction of the nano-alumina particles is 10-18%.

9. The preparation method according to claim 6, characterized in that In the outer layer installation step, the edge of the stainless steel outer cover is folded to form a flange structure with a width of 10-15 mm.

10. The preparation method according to claim 6, characterized in that In the post-processing step, the rotation speed of the grinding wheel grinder is 2800-3200 r / min.

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