A high-temperature service foamed ceramic adhesive, its preparation method and application method

Abstract

This invention belongs to the technical field of adhesive materials, specifically relating to a high-temperature service foamed ceramic adhesive and its preparation and application methods. The adhesive is composed of sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, potassium silicate, boric acid, silicon carbide, carbon powder, calcium carbonate, iron oxide, sodium carboxymethyl cellulose, and water mixed in a specific ratio. The adhesive of this invention can directly bond foamed ceramic components in high-temperature service conditions. During use, only sintering at 710–1060℃ for 10–16 minutes is required to complete the bonding, offering advantages such as a wide operating temperature range and low cost. The adhesive and its application method do not reduce the physical and mechanical properties of the foamed ceramic body. By adjusting the composition of the adhesive and the sintering temperature, the bonded foamed ceramic components can retain the excellent thermal insulation, waterproof, temperature resistance, and impact resistance properties of the foamed ceramic body at temperatures ranging from 410 to 760℃.

Description

Technical Field

[0001] This invention belongs to the technical field of adhesive materials, specifically relating to a high-temperature foamed ceramic adhesive and its preparation and application methods. Background Technology

[0002] Foamed ceramics have excellent properties such as being lightweight, heat-insulating, waterproof, and fireproof, and are widely used in many industries.

[0003] To ensure stable performance of foamed ceramics and meet the demands of automated continuous production, the initial form of foamed ceramic products is mostly foamed ceramic sheets fired in roller kilns. For large-sized foamed ceramic components with complex shapes, the foamed ceramic sheets must first be processed into the required shape and size before bonding. In the civil construction field, given the similar phase composition of foamed ceramics to stone and ceramic tiles, adhesives commonly used for bonding stone and ceramic tiles, such as marble adhesive, AB adhesive (two-component curing adhesive), silicone adhesive, and tile adhesive, can also be used to bond foamed ceramic components. However, due to their excellent temperature resistance and thermal insulation properties, foamed ceramics are more suitable for high-temperature environments, and the aforementioned adhesives do not meet the high-temperature bonding requirements of foamed ceramic components. This is because the organic components in these adhesives deteriorate and volatilize at high temperatures, leading to adhesive failure.

[0004] To ensure the stable operation of foamed ceramic components in high-temperature environments, foamed ceramic adhesives must possess not only excellent bonding properties but also superior high-temperature resistance. Furthermore, as the application of foamed ceramics expands into high-temperature fields such as aerospace, military, and metallurgy, the adhesives must also be suitable for high-temperature use to enable bonding of foamed ceramic components. However, currently, there are no foamed ceramic adhesives that meet both these performance requirements and application characteristics. Summary of the Invention

[0005] This invention addresses the current technological gap of having no foamed ceramic adhesives that can be used at high temperatures, as well as the technological deficiency of being unable to bond foamed ceramic components at high temperatures, by providing a foamed ceramic adhesive for high-temperature service, along with its preparation and application methods.

[0006] The specific technical solution is as follows:

[0007] The first objective of this invention is to provide a high-temperature service foamed ceramic adhesive, comprising a mixture one, a mixture two, and a mixed solution, wherein the weight ratio of the mixture one to the mixture two is 100:(0.8~1.2), and the weight ratio of the powder obtained by mixing the mixture one and the mixture two to the mixed solution is (13~19):1.

[0008] Furthermore, the mixture includes the following components: sodium aluminate, potassium aluminate, albite, potassium feldspar, sodium silicate, potassium silicate, and boric acid, wherein the weight ratio of sodium aluminate, potassium aluminate, albite, potassium feldspar, sodium silicate, potassium silicate, and boric acid is (13~22):(15~23):(0~15):(0~16):(0~13):(0~14):(0~8).

[0009] By adopting the above technical solution, sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, and potassium silicate in the mixture are the main components. These components work together to have excellent high-temperature melting characteristics, which can be well bonded to the foamed ceramic components at high temperatures. Boric acid is a fluxing agent, which is added to adjust the melting point of the foamed ceramic adhesive so that the foamed ceramic adhesive can meet the bonding requirements of the foamed ceramic components at different temperatures.

[0010] Furthermore, the mixture 2 includes the following components: silicon carbide, carbon powder, calcium carbonate, and iron oxide, wherein the weight ratio of silicon carbide, carbon powder, calcium carbonate, and iron oxide is (0~0.6):(0~1.3):(0~4.2):(0~1.2).

[0011] By adopting the above technical solution, silicon carbide, carbon powder, and calcium carbonate in mixture two are foaming agents. The addition of these three components is to form pores inside the foamed ceramic adhesive that is molten at high temperature, so that the bonding surface has a porous structure similar to that of the foamed ceramic body, and thus the bonding surface has physical properties similar to those of the foamed ceramic body. Iron oxide is an oxygenating agent. Its addition can accelerate the high-temperature oxidation of silicon carbide and carbon powder, accelerate the foaming of the foamed ceramic adhesive, and thus shorten the high-temperature sintering time of the foamed ceramic adhesive.

[0012] Furthermore, the mixed solution comprises sodium carboxymethyl cellulose and water, wherein the weight ratio of sodium carboxymethyl cellulose to water is (0.5~0.8):100.

[0013] The addition of sodium carboxymethyl cellulose by adopting the above technical solution is to enable the foamed ceramic adhesive to be stored stably for a long period of time.

[0014] A second objective of this invention is to provide a method for preparing the above-mentioned high-temperature foamed ceramic adhesive, comprising the following steps:

[0015] (1) Sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, potassium silicate, and boric acid are mixed in a weight ratio of (13~22):(15~23):(0~15):(0~16):(0~13):(0~14):(0~8) to obtain mixture one;

[0016] (2) Mix silicon carbide, carbon powder, calcium carbonate and iron oxide in a weight ratio of (0~0.6):(0~1.3):(0~4.2):(0~1.2) to obtain mixture two;

[0017] (3) Mix the first mixture obtained in step (1) and the second mixture obtained in step (2) at a weight ratio of 100: (0.8~1.2) to obtain the mixture;

[0018] (4) Grind the mixture obtained in step (3) into powder;

[0019] (5) Mix sodium carboxymethyl cellulose and water at a weight ratio of (0.5~0.8):100 and stir to prepare a mixed solution;

[0020] (6) The powder obtained in step (4) and the mixed solution obtained in step (5) are mixed at a weight ratio of (13~19):1 and stirred evenly to obtain the foamed ceramic adhesive for high-temperature service.

[0021] Furthermore, in step (4), the average particle size of the powder is less than 1 μm.

[0022] A third objective of this invention is to provide a method for using the aforementioned high-temperature foamed ceramic adhesive, comprising the following steps:

[0023] 1) Spray the foamed ceramic adhesive onto the surfaces of the two foamed ceramic components to be bonded;

[0024] 2) Align the surfaces of the two foamed ceramic components that have been sprayed with the foamed ceramic adhesive, and apply force in a direction perpendicular to the bonding surface;

[0025] 3) Use heating equipment to keep the bonding surfaces of the two foamed ceramic components at a temperature range of 710~1060℃ for 10~16 minutes.

[0026] Furthermore, in step 1), the coating thickness is 1.2~1.6mm.

[0027] Furthermore, in step 2), a force is applied to maintain a pressure of 1~2 MPa on the bonding surface.

[0028] Furthermore, in step 3), the heating equipment includes a high-temperature furnace and a flame torch, the specific of which needs to be determined based on the size of the foamed ceramic component and the construction conditions.

[0029] Furthermore, in step 3), the temperature at the bonding surface can be measured using a thermocouple or an infrared thermometer, depending on the heating equipment used.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] (1) The foamed ceramic adhesive of the present invention contains a large amount of sodium aluminate and potassium aluminate. The purpose is to form a large amount of mullite phase during high-temperature sintering of the foamed ceramic adhesive. Mullite has excellent high-temperature mechanical properties and low thermal conductivity, which helps to improve the high-temperature mechanical and thermal insulation properties of the bonding surface.

[0032] (2) The foamed ceramic adhesive of the present invention contains a certain amount of water. Since the foamed ceramic component is at a high temperature, when the foamed ceramic adhesive is sprayed onto the surface of the foamed ceramic component, the water in the foamed ceramic adhesive will evaporate quickly, thereby causing the foamed ceramic adhesive sprayed onto the surface of the foamed ceramic component to dehydrate rapidly. Therefore, the present invention does not require a drying process.

[0033] (3) The sintering temperature of commercially available foamed ceramics is generally around 1200℃, while the sintering temperature of the foamed ceramic adhesive of the present invention is 710~1060℃, which is much lower than the sintering temperature of foamed ceramics. It will not affect the physical and mechanical properties of foamed ceramics, thereby allowing the bonded foamed ceramic components to retain the excellent properties of the foamed ceramic body, such as light weight, heat insulation, waterproofing, temperature resistance, and impact resistance.

[0034] (4) The foamed ceramic adhesive of the present invention is formulated with inexpensive and readily available commercial raw materials, and the formulation process is simple, which has the advantages of low raw material and preparation cost; in addition, the foamed ceramic adhesive of the present invention only needs to be sintered at 710~1060℃ for 10~16min to complete the bonding of foamed ceramic components, which has the advantages of wide operating temperature range and low operating cost.

[0035] (5) The maximum service temperature of foamed ceramic materials is usually 300°C lower than the sintering temperature of the adhesive. The sintering temperature of the foamed ceramic adhesive of the present invention is 710~1060°C, so its maximum service temperature should be 410~760°C. This means that the foamed ceramic components bonded by the foamed ceramic adhesive of the present invention can be used for a long time at a temperature not exceeding 410~760°C.

[0036] (6) When the strength test of the bonded foamed ceramic components was carried out in the temperature range of 410~760℃, the failure location of all foamed ceramic components was not at the bonding point. This indicates that the strength of the foamed ceramic components bonded by the foamed ceramic adhesive and its application method of the present invention depends on the foamed ceramic body.

[0037] (7) The foamed ceramic adhesive of the present invention has a wide sintering temperature range. By adjusting the composition of the foamed ceramic adhesive, the bonding requirements of the foamed ceramic components at different temperatures can be met. The specific adjustment method is as follows: when the service temperature of the foamed ceramic component is high, the content of sodium feldspar and potassium feldspar in the main material should be increased, and the content of sodium silicate and potassium silicate should be decreased. The content of flux boric acid should be decreased. The content of silicon carbide in the foaming agent should be increased, and the content of iron oxide, carbon powder and calcium carbonate should be decreased. When the service temperature of the foamed ceramic component is low, the content of sodium feldspar and potassium feldspar in the main material should be decreased, and the content of sodium silicate and potassium silicate should be increased. The content of flux boric acid should be increased. The content of silicon carbide in the foaming agent should be decreased, and the content of iron oxide, carbon powder and calcium carbonate should be increased.

[0038] (8) Given the excellent thermal insulation properties of foamed ceramics, the temperature difference between the surface and the center of a thick foamed ceramic component will inevitably be large. The resulting effect is that when the outer side of the bonding surface reaches the optimal sintering temperature of the foamed ceramic adhesive, the temperature of the center of the bonding surface is lower; while when the center of the bonding surface reaches the optimal sintering temperature of the foamed ceramic adhesive, the temperature of the outer side of the bonding surface is higher. For thicker foamed ceramic components, taking advantage of the wide sintering temperature range of the foamed ceramic adhesive of the present invention, the heating intensity of the flame gun can be reduced and the heating time extended so that the outer side and the center of the bonding surface are respectively at the upper and lower limits of the suitable sintering temperature range of the adhesive, thereby ensuring the bonding effect of the outer side and the center of the bonding surface at the same time. On this basis, for even thicker foamed ceramic components, the low melting point foamed ceramic adhesive prepared in the present invention can be sprayed on the center of the bonding surface, which can also take into account the bonding effect of the outer side and the center of the bonding surface. Attached Figure Description

[0039] Figure 1 This is a flowchart illustrating the preparation and use of the foamed ceramic adhesive of the present invention.

[0040] Figure 2 Macroscopic optical photographs of the foamed ceramic samples used in embodiments of the present invention. Detailed Implementation

[0041] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0042] For ease of description and performance comparison, the foamed ceramic samples used in the following four examples were all cut from the same foamed ceramic slab, which was sintered at 1220℃ and had a compressive strength of 6.9 MPa and a density of 0.49 g / cm³. 3 The average pore size is 1.8 mm, the total porosity is 80%, the closed pore rate is 73%, and the macroscopic morphology is as follows: Figure 2As shown, the foamed ceramic samples used were all cuboids measuring 50mm × 30mm × 20mm, and underwent ultrasonic cleaning and drying. Furthermore, in the following four embodiments, the high-temperature environment of the foamed ceramic samples and the high-temperature sintering of the foamed ceramic adhesive were simulated using a high-temperature box furnace.

[0043] Example 1

[0044] A method for preparing a high-temperature service foamed ceramic adhesive includes the following steps:

[0045] (1) Sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, potassium silicate, and boric acid are mixed in a weight ratio of 22:23:15:16:0:0:1 to obtain mixture one;

[0046] (2) Mix silicon carbide, carbon powder, calcium carbonate and iron oxide in a weight ratio of 0.6:0:0:1.2 to obtain mixture two;

[0047] (3) Mix the first mixture obtained in step (1) and the second mixture obtained in step (2) at a weight ratio of 100:0.8 to obtain the mixture;

[0048] (4) The mixture obtained in step (3) is ball-milled into powder with an average particle size of less than 1 μm;

[0049] (5) Mix sodium carboxymethyl cellulose and water at a weight ratio of 0.8:100 and stir to prepare a mixed solution;

[0050] (6) The powder obtained in step (4) and the mixed solution obtained in step (5) are mixed at a weight ratio of 13:1 and stirred evenly to obtain the foamed ceramic adhesive for high-temperature service.

[0051] A method for using a high-temperature service foamed ceramic adhesive as described above includes the following steps:

[0052] (1) The foamed ceramic adhesive is sprayed onto the surface of two foamed ceramic samples, each with a size of 50mm×30mm, and the thickness of the adhesive spray is 1.6mm.

[0053] (2) Align the surfaces of the two foamed ceramic samples coated with the foamed ceramic adhesive and apply a vertical pressing force of 1 MPa to the surfaces.

[0054] (3) The bonding surface of the two foamed ceramic samples was sintered at high temperature using a high-temperature box furnace. The furnace temperature was raised to 1060℃ and held for 10 min.

[0055] (4) Reduce the furnace temperature to below 760℃ to complete the high-temperature sintering of the foamed ceramic adhesive and obtain the bonded sample.

[0056] The above process yields a cuboid sample with dimensions of 50mm×30mm×40mm, which can maintain the physical and mechanical properties of the foamed ceramic body at a maximum temperature of 760℃.

[0057] Example 2

[0058] A method for preparing a high-temperature service foamed ceramic adhesive includes the following steps:

[0059] (1) Sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, potassium silicate, and boric acid are mixed in a weight ratio of 13:15:0:0:13:14:8 to obtain mixture one;

[0060] (2) Mix silicon carbide, carbon powder, calcium carbonate and iron oxide in a weight ratio of 0:0.3:4.2:0.3 to obtain mixture two;

[0061] (3) Mix the first mixture obtained in step (1) and the second mixture obtained in step (2) at a weight ratio of 100:1.2 to obtain the mixture;

[0062] (4) The mixture obtained in step (3) is ball-milled into powder with an average particle size of less than 1 μm;

[0063] (5) Mix sodium carboxymethyl cellulose and water at a weight ratio of 0.5:100 and stir to prepare a mixed solution;

[0064] (6) The powder obtained in step (4) and the mixed solution obtained in step (5) are mixed at a weight ratio of 19:1 and stirred evenly to obtain the foamed ceramic adhesive for high-temperature service.

[0065] A method for using a high-temperature service foamed ceramic adhesive as described above includes the following steps:

[0066] (1) The foamed ceramic adhesive is sprayed onto the surface of two foamed ceramic samples, each with a size of 50mm×30mm, and the thickness of the adhesive spray is 1.2mm;

[0067] (2) Align the surfaces of the two foamed ceramic samples that have been sprayed with the foamed ceramic adhesive, and apply a vertical pressing force of 2 MPa to the surfaces;

[0068] (3) The bonding surface of the two foamed ceramic samples was sintered at high temperature using a high-temperature box furnace. The furnace temperature was raised to 710℃ and held for 16 minutes.

[0069] (4) Reduce the furnace temperature to below 410℃ to complete the high-temperature sintering of the foamed ceramic adhesive and obtain the bonded sample.

[0070] The above process yields a cuboid sample with dimensions of 50mm × 30mm × 40mm, which can maintain the physical and mechanical properties of the foamed ceramic body at a maximum temperature of 410℃.

[0071] Example 3

[0072] A method for preparing a high-temperature service foamed ceramic adhesive includes the following steps:

[0073] (1) Sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, potassium silicate, and boric acid are mixed in a weight ratio of 17:18:5:6:9:10:5 to obtain mixture one;

[0074] (2) Mix silicon carbide, carbon powder, calcium carbonate and iron oxide in a weight ratio of 0:0.7:3.1:0.4 to obtain mixture two;

[0075] (3) Mix the first mixture obtained in step (1) and the second mixture obtained in step (2) at a weight ratio of 100:1.1 to obtain the mixture;

[0076] (4) The mixture obtained in step (3) is ball-milled into powder with an average particle size of less than 1 μm;

[0077] (5) Mix sodium carboxymethyl cellulose and water at a weight ratio of 0.6:100 and stir to prepare a mixed solution;

[0078] (6) The powder obtained in step (4) and the mixed solution obtained in step (5) are mixed at a weight ratio of 17:1 and stirred evenly to obtain the foamed ceramic adhesive for high-temperature service.

[0079] A method for using a high-temperature service foamed ceramic adhesive as described above includes the following steps:

[0080] (1) The foamed ceramic adhesive is sprayed onto the surface of two foamed ceramic samples, each with a size of 50mm×30mm, and the thickness of the adhesive spray is 1.4mm;

[0081] (2) Align the surfaces of the two foamed ceramic samples that have been sprayed with the foamed ceramic adhesive, and apply a vertical pressing force of 2 MPa to the surfaces;

[0082] (3) The bonding surface of the two foamed ceramic samples was sintered at high temperature using a high-temperature box furnace. The furnace temperature was raised to 840℃ and held for 14 minutes.

[0083] (4) Reduce the furnace temperature to below 540℃ to complete the high-temperature sintering of the foamed ceramic adhesive and obtain the bonded sample.

[0084] The above process yields a cuboid sample with dimensions of 50mm × 30mm × 40mm, which can maintain the physical and mechanical properties of the foamed ceramic body at a maximum temperature of 540℃.

[0085] Example 4

[0086] A method for preparing a high-temperature service foamed ceramic adhesive includes the following steps:

[0087] (1) Sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, potassium silicate, and boric acid are mixed in a weight ratio of 20:21:10:11:4:5:3 to obtain mixture one;

[0088] (2) Mix silicon carbide, carbon powder, calcium carbonate and iron oxide in a weight ratio of 0.4:1.3:1.8:0 to obtain mixture two;

[0089] (3) Mix the first mixture obtained in step (1) and the second mixture obtained in step (2) at a weight ratio of 100:0.9 to obtain the mixture;

[0090] (4) The mixture obtained in step (3) is ball-milled into powder with an average particle size of less than 1 μm;

[0091] (5) Mix sodium carboxymethyl cellulose and water at a weight ratio of 0.7:100 and stir to prepare a mixed solution;

[0092] (6) The powder obtained in step (4) and the mixed solution obtained in step (5) are mixed at a weight ratio of 15:1 and stirred evenly to obtain the foamed ceramic adhesive for high-temperature service.

[0093] A method for using a high-temperature service foamed ceramic adhesive as described above includes the following steps:

[0094] (1) The foamed ceramic adhesive is sprayed onto the surface of two foamed ceramic samples, each with a size of 50mm×30mm, and the thickness of the adhesive spray is 1.4mm;

[0095] (2) Align the surfaces of the two foamed ceramic samples coated with the foamed ceramic adhesive and apply a vertical pressing force of 1 MPa to the surfaces.

[0096] (3) The bonding surface of the two foamed ceramic samples was sintered at high temperature using a high-temperature box furnace. The furnace temperature was raised to 950℃ and held for 12 minutes.

[0097] (4) Reduce the furnace temperature to below 650℃ to complete the high-temperature sintering of the foamed ceramic adhesive and obtain the bonded sample.

[0098] The above process yields a cuboid sample with dimensions of 50mm × 30mm × 40mm, which can maintain the physical and mechanical properties of the foamed ceramic body at a maximum temperature of 650℃.

[0099] Test method description:

[0100] The samples prepared in Examples 1-4 were subjected to performance tests. The compressive strength and specific gravity were measured according to the national standard GB / T5486-2008 "Test Methods for Inorganic Rigid Thermal Insulation Products". The total porosity and closed-cell rate were measured using the indirect Archimedes displacement method. Furthermore, the high-temperature compressive strength of the samples was measured using a thermal simulation testing machine (model Gleeble-3500) from Dynamic Systems Inc. (DSI), USA. The average pore size was obtained by analyzing photographs taken of the samples using ImageJ software.

[0101] The physical and mechanical properties of the bonded samples and the original samples (foamed ceramic samples) in Examples 1-4 are shown in Table 1.

[0102] Table 1. Physical and mechanical properties of the bonded samples and original samples in Examples 1-4

[0103]

[0104] Comparing the test data in Table 1, it can be seen that the bonded samples in Examples 1-4 have essentially the same average pore size as the original samples. Furthermore, excluding the influence of testing errors, with the sample volume remaining constant, the introduction of adhesive inevitably increases the sample weight and reduces pore size, resulting in an increase in specific gravity and a decrease in porosity. Because the method described in this invention uses a small amount of foamed ceramic adhesive, the increase in specific gravity and the decrease in porosity of the bonded samples are very small compared to the original samples. This means that the bonded samples essentially retain the physical properties of the original samples.

[0105] The original sample had a room temperature compressive strength of 6.9 MPa. As the temperature rose to 800°C, the compressive strength of the original sample slightly decreased to 6.5 MPa. Summarizing Examples 1-4, as the temperature increased from 410°C to 760°C, the compressive strength of the bonded sample gradually decreased from 6.9 MPa to 6.6 MPa. Since the range of compressive strength variation of the bonded sample is within the range of compressive strength variation of the original sample, it can be concluded that the compressive strength of the bonded sample and the original sample remains consistent as the temperature increases. Furthermore, according to the "barrel effect," within the temperature range of room temperature to 760°C, the strength of the bonded joint of the foamed ceramic is never lower than the strength of the foamed ceramic body.

[0106] In summary, the foamed ceramic adhesive and its application method of the present invention can enable the prepared foamed ceramic components to fully retain the excellent properties of the foamed ceramic body, such as light weight, heat insulation, waterproofing, temperature resistance, and impact resistance.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature service foamed ceramic adhesive, characterized in that, It consists of a mixture one, a mixture two, and a mixed solution, wherein the weight ratio of the mixture one to the mixture two is 100:(0.8~1.2), and the weight ratio of the powder obtained by mixing the mixture one and the mixture two to the mixed solution is (13~19):1; The mixture comprises the following components: sodium aluminate, potassium aluminate, albite, potassium feldspar, sodium silicate, potassium silicate, and boric acid, wherein the weight ratio of sodium aluminate, potassium aluminate, albite, potassium feldspar, sodium silicate, potassium silicate, and boric acid is (13~22):(15~23):(5~15):(6~16):(4~13):(5~14):(1~8). The second mixture comprises the following components: silicon carbide, carbon powder, calcium carbonate, and iron oxide, wherein the weight ratio of silicon carbide, carbon powder, calcium carbonate, and iron oxide is (0.4~0.6):(0.3~1.3):(1.8~4.2):(0.3~1.2). The mixed solution comprises sodium carboxymethyl cellulose and water, wherein the weight ratio of sodium carboxymethyl cellulose to water is (0.5~0.8):

100.

2. A method for preparing a high-temperature service foamed ceramic adhesive as described in claim 1, characterized in that, Includes the following steps: (1) Sodium aluminate, potassium aluminate, sodium feldspar, potassium feldspar, sodium silicate, potassium silicate, and boric acid are mixed in a weight ratio of (13~22):(15~23):(5~15):(6~16):(4~13):(5~14):(1~8) to obtain mixture one; (2) Mix silicon carbide, carbon powder, calcium carbonate and iron oxide in a weight ratio of (0.4~0.6):(0.3~1.3):(1.8~4.2):(0.3~1.2) to obtain mixture two; (3) Mix the first mixture obtained in step (1) and the second mixture obtained in step (2) at a weight ratio of 100: (0.8~1.2) to obtain the mixture; (4) Grind the mixture obtained in step (3) into powder; (5) Mix sodium carboxymethyl cellulose and water at a weight ratio of (0.5~0.8):100 and stir to prepare a mixed solution; (6) The powder obtained in step (4) and the mixed solution obtained in step (5) are mixed at a weight ratio of (13~19):1 and stirred evenly to obtain the foamed ceramic adhesive for high-temperature service.

3. The method for preparing the high-temperature service foamed ceramic adhesive according to claim 2, characterized in that, In step (4), the average particle size of the powder is less than 1 μm.

4. A method of using the high-temperature service foamed ceramic adhesive as described in claim 1, characterized in that, Includes the following steps: 1) Spray the foamed ceramic adhesive onto the surfaces of the two foamed ceramic components to be bonded; 2) Align the surfaces of the two foamed ceramic components that have been sprayed with the foamed ceramic adhesive, and apply force in a direction perpendicular to the bonding surface; 3) Use heating equipment to keep the bonding surfaces of the two foamed ceramic components at a temperature range of 710~1060℃ for 10~16 minutes.

5. The method of using the high-temperature service foamed ceramic adhesive according to claim 4, characterized in that, In step 1), the coating thickness is 1.2~1.6mm.

6. The method of using the high-temperature service foamed ceramic adhesive according to claim 4, characterized in that, In step 2), a force is applied to maintain a pressure of 1~2 MPa on the bonding surface.

7. The method of using the high-temperature service foamed ceramic adhesive according to claim 4, characterized in that, In step 3), the heating device is a high-temperature furnace or a flame torch.

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