A high-temperature-resistant infrared radiation coating for energy saving and efficiency improvement of high-temperature industry

Abstract

The present application relates to a kind of high-temperature industrial energy-saving and efficiency-increasing high-temperature-resistant infrared radiation paint, the working temperature of the high-temperature-resistant infrared radiation paint is 800~1500 ℃, it is composed of the following weight parts of raw materials;High-entropy perovskite radiation pigment 10~15 parts, filler 20~25 parts, high-temperature binder 20~30 parts, auxiliary agent 3~8 parts and deionized water 15~25 parts;The chemical formula of the high-entropy perovskite radiation pigment is REAlO3, wherein RE is six kinds of rare earth elements La, Pr, Ce, Nd, Sm, Gd, Er, Dy, and each rare earth element is equimolar ratio.The present application improves the infrared radiation performance of coating by rare earth doped perovskite, while reducing thermal conductivity, greatly reducing the heat loss of furnace and the temperature rise of base material.The coating prepared by the coating of the present application can comprehensively balance the heat exchange ratio of heated surface in high-temperature industry, and strengthen the radiation heat exchange capacity, its main performance is to enhance the heat utilization rate of high-temperature industry, play the role of energy saving and efficiency increasing, and can be applied to industrial kiln and power station boiler and other fields.

Description

Technical Field

[0001] This invention relates to the field of energy conservation and efficiency improvement, and in particular to a high-temperature resistant infrared radiation coating for energy conservation and efficiency improvement in high-temperature industries. Background Technology

[0002] Generally, heat transfer occurs primarily through three mechanisms: radiation, convection, and conduction. In high-temperature environments above 1000℃, radiative heat transfer accounts for over 80% of all heat transfer methods, demonstrating its crucial role in high-temperature industries, such as industrial kilns and power plant boilers. According to the Stefan-Boltzmann law, a material's infrared emissivity is directly related to its radiative capacity. Unfortunately, existing aluminosilicate refractories, especially those widely used in furnace linings, generally have low emissivity (less than 0.6), severely limiting their radiative heat transfer efficiency. To address this issue, a practical solution is to apply a high-infrared-emissivity coating to the surface of these aluminosilicate refractories. This coating not only enhances the material's absorption capacity but also significantly improves its radiative capacity, thereby greatly increasing radiative heat transfer efficiency. This innovation has profound implications for improving the thermal efficiency of high-temperature industries and achieving energy-saving goals.

[0003] In high-temperature industrial applications, non-oxide materials with high infrared emissivity, such as SiC and SiB6, are widely used. However, due to their relatively weak oxidation resistance, these materials often experience emissivity decay during long-term use at high temperatures. Although transition metals and rare earth metal oxides are commonly used infrared radiation materials and exhibit good oxidation resistance, their emissivity in the 1–5 μm wavelength range is not ideal. According to Wien's law and Plank's law, radiative heat in this wavelength range becomes dominant when the operating temperature exceeds 800 °C. Lanthanum aluminate (LaAlO3), as a rare earth composite metal oxide, has attracted considerable attention in the field of high-temperature materials due to its unique perovskite structure, stable crystal structure, and melting point as high as 2180 °C. However, the inherent infrared emissivity of this ceramic material is relatively low, especially in the 1–5 μm wavelength range, where the emissivity is only 0.21, which greatly limits its radiative heat transfer capability in high-temperature applications. To improve the infrared emission characteristics of lanthanum aluminate ceramics, researchers have attempted to dope them with metals such as Cr, Fe, Mn, and Co at the B-site, or with metals such as Ca and Sr at the A-site, or even simultaneously at both the A and B sites. While these doping methods do improve the infrared emissivity of the ceramics, they also introduce a series of new challenges and problems. For example, Cr doping can increase infrared emissivity, but it may generate harmful Cr oxides at high temperatures. 6+This increases the risk of environmental pollution. The doping of Fe and Co may lead to the formation of unstable intermediate phases, which reduces the thermal stability of ceramics and induces grain growth at high temperatures, resulting in emissivity decay and hindering long-term energy saving.

[0004] High-entropy oxides are an emerging multi-principal-component oxide material that has shown significant development potential in important fields such as fundamental physics, mechanical properties, energy storage, and catalysis. Compared with traditional doping strategies based on fewer components, multi-principal-component mixing of high-entropy oxides leads to additional performance enhancements. Due to their high configurational entropy, high-entropy oxides exhibit a series of superior properties, including high melting points, excellent hardness, good thermal stability, and outstanding corrosion resistance. By introducing different impure energy levels through the synergistic effect of multiple components, high-entropy oxides can further enhance their external radiation performance in the 1–5 μm wavelength range. However, there are few reports on high-entropy oxides as infrared radiation materials. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a high-performance, high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industries.

[0006] To address the aforementioned problems, the present invention provides a high-temperature resistant infrared radiation coating for energy conservation and efficiency improvement in high-temperature industrial applications. The coating is characterized by its operating temperature of 800-1500℃ and its composition by weight of the following raw materials: 10-15 parts high-entropy perovskite radiation pigment, 20-25 parts filler, 20-30 parts high-temperature binder, 3-8 parts additives, and 15-25 parts deionized water. The high-entropy perovskite radiation pigment has the general chemical formula REA1O3, where RE represents six rare earth elements: La, Pr, Ce, Nd, Sm, Gd, Er, and Dy, in an equimolar ratio.

[0007] The high-entropy perovskite radiation pigment has an emissivity of not less than 0.86 in the 0.78~2.5μm band and not less than 0.84 in the 2~16μm band.

[0008] The high-entropy perovskite radiation pigment is prepared by the following method: using REO with a metal element molar ratio of 1:1. x The powder and Al2O3 powder are ball-milled and mixed, then dried and ground to obtain the mixed powder; the mixed powder is then calcined at high temperature in air, cooled and ground to obtain the final product; the REO... x Pr6O 11 It consists of six of the following: La2O3, Ce2O3, Nd2O3, Sm2O3, Er2O3, Gd2O3, and Dy2O3.

[0009] The conditions for ball milling and mixing refer to wet ball milling using a planetary ball mill, with a milling speed of 300~500 r / min, a milling time of 5~12 hours, and a ball-to-water mass ratio of 2~5:1:3.

[0010] The conditions for high-temperature calcination are: calcination temperature of 900~1500℃, heating rate of 3~10℃ / min, and calcination time of 2~6 hours; the cooling method is one of furnace cooling, air quenching cooling, and liquid nitrogen quenching cooling.

[0011] The filler is at least three of the following: zirconium oxide, hafnium oxide, yttrium oxide, Fischerite, amphibole, feldspar, mullite, and clay, with a particle size of 20-100 nm and a specific surface area of ​​40-100 m². 2 / g.

[0012] The high-temperature binder refers to one or two of rare earth phosphate, silica sol, and aluminum dihydrogen phosphate.

[0013] The additives are a mixture of leveling agent, dispersant and defoamer in a mass ratio of 1:1:1 to 1:2:3; the leveling agent is one or two of Deqian 810 silicone leveling agent-polyether modified polysiloxane, AFCONA-3587-polyether modified organosilicon, and AFCONA-3085-polyether modified organosilicon; the dispersant is one or more of 5040 dispersant, LED-1 dispersant, S19 dispersant and sodium lignosulfonate; the defoamer is one or two of polyether modified polydimethylsiloxane, polyoxyethylene polyoxypropylene amine ether and dimethyl silicone oil.

[0014] The preparation method of a high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industries, as described above, is characterized by the following: First, the mixture is weighed according to the specified proportions; then, high-entropy perovskite radiation pigment is added to a high-temperature binder and mechanically stirred for 10-15 minutes. After the mixture is homogeneous, filler is added and mechanically stirred for 30-45 minutes to obtain mixture A; deionized water is added to mixture A and mechanically stirred for 10-15 minutes, then additives are added and stirred until homogeneous to obtain mixture B; mixture B is stirred in a planetary ball mill at a speed of 400-500 r / min for 1.5-3 hours to obtain the final product.

[0015] A coating prepared using the high-temperature resistant infrared radiation coating as described above is characterized in that: the emissivity of the coating at room temperature is not less than 0.96 in the 0.78~2.5μm band and not less than 0.90 in the 2~16μm band.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This invention involves multi-element rare-earth doped aluminates at the A-site. LaAlO3 is a perovskite semiconductor with a high melting point (2180℃), good high-temperature stability, and a typical indirect transition band structure. Furthermore, it exhibits high compatibility with commonly used aluminum-silicon refractory materials in thermal processing equipment in terms of chemical composition and thermal expansion coefficient. The doping induces lattice distortion, disrupting the original lattice vibration period and increasing lattice vibration, thereby improving the pigment's light absorption and infrared radiation properties. Simultaneously, the entropy-driven structural stabilization effect avoids the segregation of traditional perovskite oxides.

[0018] 2. This invention improves the infrared radiation performance of the coating by doping perovskite with rare earth elements, resulting in an infrared emissivity as high as 0.96, while simultaneously reducing the thermal conductivity of the coating to as low as 1.0~1.5 W / m². -1 K -1 This greatly reduces heat loss in the furnace and temperature rise of the substrate.

[0019] 3. The coating prepared using the coating of the present invention has a smooth, dense surface, is free of bubbles and cracks, and further improves its resistance to high-temperature corrosion.

[0020] 4. The coating prepared by the coating of the present invention was subjected to molten salt corrosion at 700°C for 240 hours. The molten salt was Na2SO4 + K2SO4 with a mass ratio of 1:1. After high-temperature molten salt corrosion, the coating was smooth, dense, free of blistering and cracking, indicating that the coating prepared by the present invention has excellent resistance to high-temperature molten salt corrosion.

[0021] 5. The coating prepared on the ceramic fiber board using the coating of the present invention was subjected to a 72-hour thermal stability test in an air environment at 1400℃. The results showed that the coating prepared by the coating has excellent high temperature resistance.

[0022] 6. The coating prepared using the coating of this invention can comprehensively balance the heat exchange ratio of the heated surface in high-temperature industry and enhance the radiative heat exchange capacity. Its main manifestation is to enhance the heat utilization rate of high-temperature industry, play a role in energy saving and efficiency improvement, and can be applied to industrial kilns and power plant boilers. Attached Figure Description

[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0024] Figure 1 This is Embodiment 1 of the present invention (La) 1 / 6 Pr 1 / 6 Ce 1 / 6 Er 1 / 6 Sm 1 / 6 Gd 1 / 6 XRD pattern of AlO3.

[0025] Figure 2 This is Embodiment 2 of the present invention (La)1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 Er 1 / 6 XRD pattern of AlO3.

[0026] Figure 3 This is Embodiment 2 of the present invention (La) 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 Er 1 / 6 Infrared radiation spectrum of AlO3 in the 0.78~2.5μm band.

[0027] Figure 4 This is embodiment 3 of the present invention (La) 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Er 1 / 6 Sm 1 / 6 XRD pattern of AlO3.

[0028] Figure 5 This is embodiment 4 of the present invention (La) 1 / 6 Pr 1 / 6 Er 1 / 6 Nd 1 / 6 Dy 1 / 6 Gd 1 / 6 XRD pattern of AlO3. Detailed Implementation

[0029] A high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industries, the coating having a working temperature of 800~1500℃, is composed of the following raw materials in parts by weight (g): 10~15 parts of high-entropy perovskite radiation pigment, 20~25 parts of filler, 20~30 parts of high-temperature binder, 3~8 parts of additives, and 15~25 parts of deionized water.

[0030] The preparation method is as follows: First, weigh the ingredients according to the specified ratio; then add the high-entropy perovskite radiation pigment to the high-temperature binder and mechanically stir for 10-15 minutes. After stirring evenly, add the filler and mechanically stir for 30-45 minutes to obtain mixture A; add deionized water to mixture A and mechanically stir for 10-15 minutes, then add the additives and stir evenly to obtain mixture B; mix mixture B using a planetary ball mill at a speed of 400-500 r / min for 1.5-3 hours to obtain the final product.

[0031] The high-entropy perovskite radiation pigment has the general chemical formula REAlO3, where RE represents six rare earth elements: La, Pr, Ce, Nd, Sm, Gd, Er, and Dy, in equimolar ratios. Its emissivity is not less than 0.86 in the 0.78–2.5 μm wavelength range and not less than 0.84 in the 2–16 μm wavelength range.

[0032] This high-entropy perovskite radiation pigment was prepared by the following method: using REO with a metal element molar ratio of 1:1. x Using powder and Al2O3 powder as raw materials, REO x Pr6O 11 The raw materials are selected from six of the following: La₂O₃, Ce₂O₃, Nd₂O₃, Sm₂O₃, Er₂O₃, Gd₂O₃, and Dy₂O₃. The above raw materials are wet-milled using a planetary ball mill at a speed of 300-500 r / min for 5-12 hours, with a ball-to-material-to-water mass ratio (g / g) of 2-5:1:3. The milling process involves milling for 1 hour, followed by a 10-minute pause, then milling for another hour, followed by a 10-minute pause, and this cycle is repeated. After milling and mixing, the mixture is dried and ground to obtain a powder. This powder is then calcined in air at a high temperature of 900-1500℃, with a heating rate of 3-10℃ / min, for 2-6 hours. After calcination, the mixture is cooled and ground using one of the following methods: furnace cooling, air quenching, or liquid nitrogen quenching.

[0033] The filler consists of at least three of the following: zirconium oxide, hafnium oxide, yttrium oxide, Fischerite, amphibole, feldspar, mullite, and clay, with a particle size of 20–100 nm and a specific surface area of ​​40–100 m². 2 / g. This filler significantly enhances the coating's light absorption, infrared radiation, and thermal shock resistance.

[0034] High-temperature binders refer to one or two of rare earth phosphates, silica sol, and aluminum dihydrogen phosphate.

[0035] The additives are a mixture of leveling agent, dispersant, and defoamer in a mass ratio (g / g) of 1:1:1 to 1:2:3. The leveling agent is one or two of the following: Deqian 810 silicone leveling agent - polyether modified polysiloxane, AFCONA-3587 - polyether modified organosilicon, and AFCONA-3085 - polyether modified organosilicon; the dispersant is one or more of the following: 5040 dispersant, LED-1 dispersant, S19 dispersant, and sodium lignosulfonate; the defoamer is one or two of the following: polyether modified polydimethylsiloxane, polyoxyethylene polyoxypropylene amine ether, and dimethyl silicone oil.

[0036] A coating prepared using this high-temperature resistant infrared radiation coating is characterized in that: the emissivity of the coating is not less than 0.96 in the 0.78~2.5μm band and not less than 0.90 in the 2~16μm band at room temperature.

[0037] Example 1

[0038] (1) High-entropy perovskite radiation pigments (La 1 / 6 Pr 1 / 6 Ce 1 / 6 Er 1 / 6 Sm 1 / 6 Gd 1 / 6 Preparation of AlO3

[0039] Weigh out 1 mol of La2O3 and 1 mol of Pr6O3 respectively. 11 Zirconia balls (1 mol), Ce₂O₃ (1 mol), Er₂O₃ (1 mol), Sm₂O₃ (1 mol), Gd₂O₃ (1 mol), and Al₂O₃ (6 mol) powders were prepared. Zirconia balls, raw materials, and ultrapure water were added to a ball mill jar at a ball mill mass ratio (g / g) of 2:1:3. The jar was placed on the ball mill station, and ball milling was performed for 1 hour at 300 r / min, followed by a 10-min pause. This constituted one ball milling cycle. After 10 minutes, ball milling was performed again for 1 hour at 300 r / min, for a total of 12 hours to obtain a mixed powder. The resulting mixed powder was then dried, ground, and placed in a muffle furnace. It was heated to 900℃ in air (heating rate 3℃ / min) and calcined for 6 hours. Then, it was air-quenched and cooled to room temperature to obtain a single-phase (La)₂O₃ powder. 1 / 6 Pr 1 / 6 Ce 1 / 6 Er 1 / 6 Sm 1 / 6 Gd 1 / 6 AlO3 high-entropy oxide powder, such as Figure 1 As shown. The particle size is 20 nm.

[0040] (2) Preparation of high temperature resistant infrared radiation coating

[0041] Paint formulation: 10 g (La 1 / 6 Pr 1 / 6 Ce 1 / 6 Er 1 / 6 Sm 1 / 6 Gd 1 / 6 AlO3, 20 g zirconium oxide, 20 g high-temperature binder, 3 g additives and 15 g deionized water.

[0042] The preparation method is as follows: First, weigh the ingredients according to the specified ratio; then add the high-entropy perovskite radiation pigment to the high-temperature binder and mechanically stir for 10-15 minutes. After stirring evenly, add the filler and mechanically stir for 30-45 minutes to obtain mixture A; add deionized water to mixture A and mechanically stir for 10-15 minutes, then add the additives and stir evenly to obtain mixture B; mix mixture B by stirring it in a planetary ball mill at a speed of 400-500 r / min for 1.5-3 hours.

[0043] Example 2

[0044] (1) High-entropy perovskite radiation pigments (La 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 Er 1 / 6 Preparation of AlO3

[0045] Weigh out 1 mol of La2O3 and 1 mol of Pr6O3 respectively. 11 Zirconia balls (1 mol), Ce₂O₃ (1 mol), Nd₂O₃ (1 mol), Gd₂O₃ (1 mol), Er₂O₃ (1 mol), and Al₂O₃ (6 mol) powders were prepared. Zirconia balls, raw materials, and ultrapure water were added to a ball mill jar at a ball mill mass ratio (g / g) of 4:1:3. The jar was placed on the ball mill station, and ball milling was performed for 1 hour at 400 r / min, followed by a 10-min pause. This constituted one ball milling cycle. After 10 minutes, ball milling was performed again for 1 hour at 400 r / min, for a total of 8 hours to obtain a mixed powder. The resulting mixed powder was then dried, ground, and placed in a muffle furnace. It was heated to 1000℃ in air (heating rate 3℃ / min) and calcined for 6 hours. Then, it was air-quenched and cooled to room temperature to obtain a single-phase (La)₂O₃ powder. 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 Er 1 / 6 AlO3 high-entropy oxide powder, such as Figure 2 As shown. The infrared radiation of the powder in the 0.78~2.5μm wavelength band is as follows. Figure 3 As shown. The particle size is 20 nm.

[0046] (2) Preparation of high temperature resistant infrared radiation coating

[0047] Paint formulation: 15 g (La 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 Er 1 / 6AlO3, 25 g zirconium oxide, 30 g high-temperature binder, 8 g additives and 25 g deionized water.

[0048] The preparation method is the same as in Example 1.

[0049] Example 3

[0050] (1) High-entropy perovskite radiation pigments (La 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Er 1 / 6 Sm 1 / 6 Preparation of AlO3

[0051] Weigh out 1 mol of La2O3 and 1 mol of Pr6O3 respectively. 11 Zirconia balls (1 mol), Ce₂O₃ (1 mol), Nd₂O₃ (1 mol), Er₂O₃ (1 mol), Sm₂O₃ (1 mol), and Al₂O₃ (6 mol) powders were prepared. Zirconia balls, raw materials, and ultrapure water were added to a ball mill jar at a ball mill mass ratio (g / g) of 4:1:3. The jar was placed on the ball mill station, and ball milling was performed for 1 hour at 400 r / min, followed by a 10-min pause. This constituted one ball milling cycle. After 10 minutes, ball milling was performed again for 1 hour at 400 r / min, for a total of 8 hours to obtain a mixed powder. The ball-milled mixed powder was then dried, ground, and placed in a muffle furnace. The furnace was heated to 1300℃ in air (heating rate 8℃ / min) and calcined for 4 hours. Then, it was air-quenched and cooled to room temperature to obtain a single-phase (La)₂O₃ powder. 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Er 1 / 6 Sm 1 / 6 AlO3 high-entropy oxide powder, such as Figure 4 As shown. The particle size is 20 nm.

[0052] (2) Preparation of high temperature resistant infrared radiation coating

[0053] Paint formulation: 11 g (La 1 / 6 Pr 1 / 6 Ce 1 / 6 Nd 1 / 6 Er 1 / 6 Sm 1 / 6 AlO3, 23 g zirconium oxide, 25 g high-temperature binder, 5 g additives and 13 g deionized water.

[0054] The preparation method is the same as in Example 1.

[0055] Example 4

[0056] (1) High-entropy perovskite radiation pigments (La 1 / 6 Pr 1 / 6 Er 1 / 6 Nd 1 / 6 Dy 1 / 6 Gd 1 / 6 Preparation of AlO3

[0057] Weigh out 0.2 mol of La₂O₃ and 0.2 mol of Pr₆O₃ respectively. 11 Zirconia balls (0.2 mol), Er₂O₃ (0.2 mol), Nd₂O₃ (0.2 mol), Dy₂O₃ (0.2 mol), Gd₂O₃ (0.2 mol), and Al₂O₃ (1 mol) powder were prepared. Zirconia balls, raw materials, and ultrapure water were added to a ball mill jar at a ball mill mass ratio (g / g) of 5:1:3. The jar was placed on the ball mill station, and ball milling was performed for 1 hour at 500 r / min, followed by a 10-min pause. This constituted one ball milling cycle. After 10 minutes, ball milling was performed again for 1 hour at 500 r / min, for a total of 5 hours to obtain a mixed powder. The ball-milled mixed powder was then dried, ground, and placed in a muffle furnace. The furnace was heated to 1500℃ in air (heating rate 10℃ / min) and calcined for 2 hours. Then, it was air-quenched and cooled to room temperature to obtain a single-phase (La)₂O₃ powder. 1 / 6 Pr 1 / 6 Er 1 / 6 Nd 1 / 6 Dy 1 / 6 Gd 1 / 6 AlO3 high-entropy oxide powder, such as Figure 5 As shown. The particle size is 20 nm.

[0058] (2) Preparation of high temperature resistant infrared radiation coating

[0059] Paint formulation: 14 g (La 1 / 6 Pr 1 / 6 Er 1 / 6 Nd 1 / 6 Dy 1 / 6 Gd 1 / 6 AlO3, 23 g zirconium oxide, 29 g high-temperature binder, 6 g additives and 24 g deionized water.

[0060] The preparation method is the same as in Example 1.

[0061] The high-temperature resistant infrared radiation coatings prepared in Examples 1-4 were applied to a substrate (nickel-based alloy 625) using a spraying method. The substrate was then placed in a muffle furnace at 300°C for 1 hour and cooled with the furnace. The dry film thickness was 20-60 μm, and the coating performance was tested.

[0062] 1. Emission spectrum

[0063] The emission spectrum of the coating in the 0.78~2.5μm band was tested using a Lambda 950 UV-Vis-NIR spectrophotometer (including a 150mm integrating sphere), in accordance with the national standard GB / T 26974-2011.

[0064] Test results: The average emissivity of the coating in the 0.78~2.5μm band is greater than 0.96.

[0065] 2. Infrared emissivity

[0066] The normal emissivity of the coating in the range of 2~16μm was tested using a Japanese TSS-5X infrared radiation meter, in accordance with the national standard GB / T 4653-1984.

[0067] Test results: The coating has an emissivity of not less than 0.90 in the 2 ~ 16 μm band and has good infrared radiation characteristics, as shown in Table 1.

[0068] 3. Thermal conductivity

[0069] The heat capacity Cp was measured using a differential scanning calorimeter (DSC) (Netzsch STA449F3, Germany). The thermal conductivity of the sample was obtained using the Kelemen formula, with reference to the standard GB / T 10294-2008.

[0070] Test results: The thermal conductivity of the coating is 1.2~1.4 W / m. -1 K -1 It has a low thermal conductivity, as shown in Table 1.

[0071] 4. Adhesion

[0072] The adhesion of the coating was tested using the pull-out method, with reference to the standard ASTM D 4541, "Determination of the pull-out strength of coatings using a portable adhesion tester".

[0073] Test results: The coating pull-out strength is greater than 5 MPa, as shown in Table 1.

[0074] 5. Thermal shock resistance

[0075] The coating was placed in an air atmosphere in a box furnace and heated to 700°C at a heating rate of 5°C / min. After holding at that temperature for 30 min, it was removed and cooled by water quenching. This process was repeated 10 times, and the coating surface was observed as shown in Table 1.

[0076] Test results: The coating surface is intact, with no peeling or cracks.

[0077] 6. Coating salt spray corrosion resistance test

[0078] Artificial Atmosphere Corrosion Test - Salt Spray Test (NSS), Test Standard: GB / T 10125-2012.

[0079] Test results: After 1000 hours of salt spray testing, the coating remained intact and showed no signs of corrosion, as shown in Table 1.

[0080] Table 1. Performance characterization of coatings prepared in Examples 1-4

[0081]

[0082] As shown in Table 1, the high-temperature resistant infrared radiation coating prepared using the present invention has good infrared radiation characteristics and low thermal conductivity, and the coating has excellent adhesion, thermal shock resistance and corrosion resistance.

[0083] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industrial applications, characterized in that: This high-temperature resistant infrared radiation coating operates at temperatures of 800~1500℃ and is composed of the following raw materials in parts by weight: 10~15 parts high-entropy perovskite radiation pigment, 20~25 parts filler, 20~30 parts high-temperature binder, 3~8 parts additives, and 15~25 parts deionized water. The high-entropy perovskite radiation pigment has the general chemical formula REA1O3, where RE represents six rare earth elements: La, Pr, Ce, Nd, Sm, Gd, Er, and Dy, in equimolar ratios. The high-entropy perovskite radiation pigment has an emissivity of not less than 0.86 in the 0.78~2.5μm wavelength range and not less than 0.84 in the 2~16μm wavelength range. The filler is at least three of the following: zirconium oxide, hafnium oxide, yttrium oxide, Fischerite, amphibole, feldspar, mullite, and clay, with a particle size of 20~100nm and a specific surface area of ​​40~100m². 2 / g; The high-temperature binder refers to one or two of rare earth phosphate, silica sol, and aluminum dihydrogen phosphate.

2. The high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industrial applications as described in claim 1, characterized in that: The high-entropy perovskite radiation pigment is prepared by the following method: using REO with a metal element molar ratio of 1:

1. x The powder and Al2O3 powder are ball-milled and mixed, then dried and ground to obtain the mixed powder; the mixed powder is then calcined at high temperature in air, cooled and ground to obtain the final product; the REO... x Pr6O 11 It consists of six of the following: La2O3, Ce2O3, Nd2O3, Sm2O3, Er2O3, Gd2O3, and Dy2O3.

3. The high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industrial applications as described in claim 2, characterized in that: The conditions for ball milling and mixing refer to wet ball milling using a planetary ball mill, with a milling speed of 300~500 r / min, a milling time of 5~12 hours, and a ball-to-water mass ratio of 2~5:1:

3.

4. The high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industrial applications as described in claim 2, characterized in that: The conditions for high-temperature calcination are: calcination temperature of 900~1500℃, heating rate of 3~10℃ / min, and calcination time of 2~6 hours; the cooling method is one of furnace cooling, air quenching cooling, and liquid nitrogen quenching cooling.

5. A high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industrial applications as described in claim 1, characterized in that: The additives are a mixture of leveling agent, dispersant and defoamer in a mass ratio of 1:1:1 to 1:2:3; the leveling agent is one or two of Deqian 810 silicone leveling agent-polyether modified polysiloxane, AFCONA-3587-polyether modified organosilicon, and AFCONA-3085-polyether modified organosilicon; the dispersant is one or more of 5040 dispersant, LED-1 dispersant, S19 dispersant and sodium lignosulfonate; the defoamer is one or two of polyether modified polydimethylsiloxane, polyoxyethylene polyoxypropylene amine ether and dimethyl silicone oil.

6. The preparation method of a high-temperature resistant infrared radiation coating for energy saving and efficiency improvement in high-temperature industrial applications as described in claim 1, characterized in that: The method involves first weighing the ingredients according to the specified proportions; then adding the high-entropy perovskite radiation pigment to the high-temperature binder and mechanically stirring for 10-15 minutes until homogeneous; finally, adding filler and mechanically stirring for 30-45 minutes to obtain mixture A; adding deionized water to mixture A and mechanically stirring for 10-15 minutes; then adding additives and stirring until homogeneous to obtain mixture B; and finally, stirring mixture B using a planetary ball mill at a speed of 400-500 r / min for 1.5-3 hours to obtain the final product.

7. A coating prepared using the high-temperature resistant infrared radiation coating as described in claim 1, characterized in that: The emissivity of this coating is not less than 0.96 in the 0.78~2.5μm band and not less than 0.90 in the 2~16μm band at room temperature.

Images