A high-strength insulator and a method for manufacturing the same

Abstract

The application discloses a high-strength insulator and a preparation method thereof, and belongs to the technical field of insulator preparation. The application takes longfeng mud, alpha-alumina, titanium oxide, magnesium oxide, boron oxide and aluminum silicate fiber as the cladding layer raw materials, takes alpha-alumina, gadolinium zirconate, cerium oxide, strontium oxide and feldspar powder as the core layer raw materials, and the two are further made into composite particles, which are adaptively added into a multi-element system constructed by Jiepai mud, longfeng mud, calcined coal gangue, calcined bauxite and wollastonite. The application not only effectively improves the bending strength and volume resistivity of the insulator, but also has excellent compactness, can better meet the use requirements in special weather environments such as humidity, vibration and extreme cold and heat, and has good market competitiveness.

Description

Technical Field

[0001] This invention belongs to the field of insulator preparation technology, specifically relating to a high-strength insulator and its preparation method. Background Technology

[0002] Insulators are special insulating components in power systems that provide electrical insulation and mechanical support / fixation. They can withstand voltage and mechanical stress and play a crucial role in overhead transmission lines, widely used in high-voltage power line towers, substations, and other applications. Based on the insulating materials used, they can be classified into porcelain insulators, glass insulators, and composite insulators. Porcelain insulators are made of electrical ceramics, specifically quartz, feldspar, and clay, fired at high temperatures. Their surface is usually covered with porcelain enamel, giving them excellent mechanical strength, density, and smoothness. Porcelain insulators were first used in power systems due to their good chemical stability and slow performance degradation over long-term operation; many porcelain insulators have operating records spanning decades. Among various types of insulators, porcelain insulators are the most widely used.

[0003] However, although porcelain insulators dominate in practical applications, the material itself determines that there are inherent defects in its comprehensive performance that are difficult to overcome: on the one hand, due to insufficient sintering density, micro-defects such as internal pores are difficult to eliminate, resulting in a significant decrease in volume resistivity after being exposed to moisture; on the other hand, porcelain insulators are a typical brittle system, which not only has insufficient fracture toughness and bending strength, but also the thermal expansion mismatch at the interface of the traditional ternary system matrix is ​​prone to inducing micro-cracks, and is prone to brittle fracture accidents without warning when subjected to some special weather conditions such as strong winds and extreme cold and heat.

[0004] In view of this, in order to meet the stringent requirements of modern power systems for the high reliability of insulators, it is urgent to conduct further research and improvement on the existing porcelain insulator raw material system and sintering process. Summary of the Invention

[0005] In view of the content mentioned in the background art, the purpose of this invention is to provide a high-strength insulator and its preparation method. By constructing different multi-component raw material systems, this invention can effectively improve the bending strength and volume resistivity of the obtained porcelain insulator, making it more suitable for complex environments and ensuring long-term operational stability.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: This invention provides a method for preparing a high-strength insulator, comprising the following steps: Step 1: Using Changfeng mud, α-alumina, titanium oxide, magnesium oxide, boron oxide, and aluminum silicate fiber as coating layer raw materials, and α-alumina, gadolinium zirconate, cerium oxide, strontium oxide, and feldspar powder as core layer raw materials, the coating layer slurry and core layer slurry are obtained by ball milling with water respectively; the core layer slurry is spray-dried to obtain granules, which are then immersed in the coating layer slurry and thoroughly mixed. The resulting mixed slurry is then spray-dried to obtain composite granules for later use. Step 2: Take Jiepai mud, Changfeng mud, calcined coal gangue, calcined high-alumina bauxite, wollastonite, feldspar powder, quartz powder, fly ash, and aluminum silicate fiber, mix them, add water and ball mill, sieve them, add composite particles and mix thoroughly, dehydrate and age to obtain the green body slurry. Step 3: Inject the blank slurry into the mold, press the blank to obtain a green blank, apply glaze to the surface of the blank and fire it, and finally glue it to the metal parts to obtain the finished insulator.

[0007] In a preferred embodiment, the coating material in step one is as follows by weight: 40-52 parts of Changfeng mud, 25-35 parts of α-alumina, 1-5 parts of titanium dioxide, 2-4 parts of magnesium oxide, 0.6-1 parts of boron oxide, and 8-12 parts of aluminum silicate fiber.

[0008] In a preferred embodiment, the core layer raw materials in step one are, by weight, 50-58 parts of α-alumina, 2.5-5.0 parts of gadozirconate, 2.0-3.5 parts of cerium oxide, 0.8-2.0 parts of strontium oxide, and 2-3 parts of feldspar powder.

[0009] In one preferred embodiment, the particle size of the coating slurry after ball milling in step one is 2-4 μm, and the particle size of the core slurry is 4-10 μm.

[0010] In a preferred embodiment, the solid-liquid ratio of the particles obtained by spray drying the core layer slurry in step one to the coating layer slurry is 1:(1.2-1.5) based on the total weight ratio of the solid raw materials used to prepare the particles and the coating layer slurry.

[0011] This invention optimizes the types and combinations of raw materials to prepare a composite particle system consisting of a coating layer and a core layer. α-alumina is used as the main raw material, whose high strength and hardness facilitate the formation of a hard core framework. The coating layer, made of Changfeng clay and aluminosilicate fibers, is similar in phase to the matrix and can serve as a transitional buffer layer, improving the dispersion of the composite particles in the green body. From the perspective of individual raw materials, gadozirconate has a pyrochlore structure and good thermal stability; titanium oxide, aluminosilicate fibers, and cerium oxide have toughening, stabilizing, and reinforcing effects, while magnesium oxide, boron oxide, and strontium oxide have sintering and melting aid effects. From an overall perspective, on the one hand, cerium oxide, magnesium oxide, and strontium oxide can be doped into the gadozirconate lattice to form a multiphase structure, causing lattice expansion and distortion, effectively improving strength while ensuring that toughness does not decrease significantly or even increases slightly; on the other hand, the gadozirconate structure itself easily accumulates alkali metals at grain boundaries, avoiding the formation of low-resistivity phases, effectively reducing interfacial leakage paths, and thus improving volume resistivity. The composite particles of this invention can be uniformly dispersed in the subsequent matrix. Through the combined action of internal particle doping, fiber bridging, and crack deflection as internal reinforcement points, it not only effectively improves the compactness and strength, but also benefits the long-term stability of the insulator's surface flashover and volume resistivity.

[0012] In a preferred embodiment, the raw materials for the green body in step two are as follows by weight: 54-60 parts of Jiepai clay, 20-25 parts of Changfeng clay, 60-75 parts of calcined coal gangue, 45-65 parts of calcined high-alumina bauxite, 40-50 parts of wollastonite, 20-30 parts of feldspar powder, 4-10 parts of quartz powder, 5-10 parts of fly ash, 0.5-3 parts of aluminum silicate fiber, and 3-8 parts of composite particles.

[0013] On the other hand, this invention adjusts the raw material combination based on the traditional ternary system of kaolin, quartz, and feldspar. It uses Jiepai clay, Changfeng clay, and calcined coal gangue as the main clay, calcined high-alumina bauxite to replace most of the quartz as aggregate, and wollastonite, feldspar, and fly ash as composite flux. It also adds aluminosilicate fibers to the aforementioned composite particles. Jiepai clay and Changfeng clay have a moderate silica-alumina ratio, which can reduce green body shrinkage and cracking. Calcined coal gangue, after processing, has a high alumina content, which can replace commercial kaolin and effectively reduce costs. Calcined high-alumina bauxite can increase the aluminum content and promote the formation of a mullite / corundum skeleton with calcined coal gangue at high temperatures, which is beneficial to improving the bending strength of the insulator. Wollastonite significantly lowers the firing temperature and can generate needle-like interweaving earlier, thereby further improving mechanical strength and reducing dielectric loss. The multi-component system of Jiepai mud, Changfeng mud, calcined coal gangue, calcined high-alumina bauxite, and wollastonite used in this invention can not only effectively reduce raw material and process costs, but also further improve the performance of insulators.

[0014] As a preferred embodiment, the glaze formula used in step three is as follows: 30-35 parts feldspar powder, 5-10 parts talc powder, 10-14 parts Jiepai clay, 7-10 parts Changfeng clay, 6-8 parts zirconium silicate, 16-20 parts quartz powder, 8-12 parts waste porcelain powder, and 3-5 parts calcite. Considering both the compatibility and smoothness of the aforementioned raw material formula, this invention also designs a glaze system with a similar combination of raw materials.

[0015] In a preferred embodiment, the thickness of the glaze layer applied in step three is 0.1-0.3 mm.

[0016] As a preferred embodiment, the firing parameters in step three are as follows: under an oxidizing atmosphere, first heat to 1120-1180℃ and hold for 20-40 min; then continue to heat to 1260-1310℃ and hold for 1-2 h; finally cool with the furnace to obtain the final product.

[0017] Another object of the present invention is to provide a high-strength insulator obtained by the above-described preparation method.

[0018] Compared with the prior art, the beneficial effects of the present invention are: This invention constructs a multi-component system using Jiepai clay, Changfeng clay, calcined coal gangue, calcined high-alumina bauxite, and wollastonite, and simultaneously prepares a composite particle. By adaptably incorporating this particle into the system, the shortcomings and defects of traditional ternary systems are effectively overcome. The porcelain insulators prepared by this invention not only have significantly improved bending strength and volume resistivity, but also excellent density, better meeting the usage requirements in special weather environments such as humidity, vibration, and extreme hot and cold temperatures, and possessing strong market competitiveness. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with embodiments. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] In the experiments described below in this invention, the purity of α-alumina used is not less than 99.9%; the length of aluminosilicate fibers is 20-50 μm and the aspect ratio is 1:(10-20); the Al2O3 content of calcined coal gangue is 38.72%; the Al2O3 content of calcined high-alumina bauxite is 76.94%; the main components of Jiepai mud are SiO2 66.34%, Al2O3 21.08%, Fe2O3 0.41%, TiO2 0.83%, K2O 0.45%, Na2O 0.28%, and CaO 0.21%; and the main components of Changfeng mud are SiO2 68.50%, Al2O3 22.84%, Fe2O3 1.05%, TiO2 0.19%, K2O 2.88%, Na2O 0.23%, and CaO 0.32%.

[0022] Example 1 A method for preparing a high-strength porcelain insulator, comprising the following steps: 1. Weigh out 45 parts of Changfeng mud, 30 parts of α-alumina, 3 parts of titanium dioxide, 3 parts of magnesium oxide, 0.8 parts of boron oxide, and 10 parts of aluminum silicate fiber by weight. Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:1.5:1.2. Ball mill at 300 rpm until the particle size is 2-4 μm to obtain the coating slurry. Separately, weigh out 54 parts of α-alumina, 3.5 parts of Gd2Zr2O7, 2.8 parts of cerium oxide, 1.5 parts of strontium oxide, and 2.5 parts of feldspar powder by weight. Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:1.5:1.2. Ball mill at 300 rpm until the particle size is 4-10 μm to obtain the core layer slurry.

[0023] 2. Spray dry the obtained core layer slurry to obtain particles, and then immerse them in the coating layer slurry (the immersion solid-liquid ratio is 1:1.4 based on the total weight ratio of the solid raw materials used in the preparation of the particles and the coating layer slurry), and ultrasonically stir for 20 min; spray dry the resulting mixed slurry to obtain composite particles for later use.

[0024] 3. Weigh out 58 parts of Jiepai mud, 22 parts of Changfeng mud, 68 parts of calcined coal gangue, 55 parts of calcined high-alumina bauxite, 45 parts of wollastonite, 26 parts of feldspar powder, 7 parts of quartz powder, 8 parts of fly ash, and 1.8 parts of aluminum silicate fiber according to the following weight proportions: Mix the raw materials and add water at a ratio of 1:3:1.5 for ball milling at 500 rpm for 48 hours. After passing through a 300-mesh sieve, add 6 parts of the resulting composite particles and ultrasonically stir for 30 minutes. Dehydrate to a moisture content of 15% and age for 48 hours to obtain the green body slurry.

[0025] 4. Weigh out 32 parts feldspar powder, 8 parts talc powder, 12 parts Jiepai clay, 8 parts Changfeng clay, 7 parts zirconium silicate, 18 parts quartz powder, 10 parts waste porcelain powder, and 4 parts calcite according to the following weight proportions: Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:3:1.5. Ball mill at 500 rpm until the particle size is 1-3 μm. Aging for 48 hours yields a glaze slurry (adjust specific gravity to 1.6 g / m³). 3 The slurry is injected into a mold and cold isostatically pressed to obtain a green body. A glaze slurry (0.2 mm) is sprayed onto the surface of the green body. After drying, it is transferred to an atmosphere furnace (under forced air, O24%): first, the temperature is raised to 1150℃ at 4℃ / min and held for 30 min; then, the temperature is raised to 1290℃ at 3℃ / min and held for 1.5 h; the green body is cooled in the furnace to obtain the green body; the fired porcelain part is glued to the steel cap and steel foot to obtain the finished porcelain insulator.

[0026] Example 2 A method for preparing a high-strength porcelain insulator, comprising the following steps: 1. Weigh out 40 parts of Changfeng mud, 25 parts of α-alumina, 1 part of titanium dioxide, 2 parts of magnesium oxide, 0.6 parts of boron oxide, and 8 parts of aluminum silicate fiber by weight. Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:1.5:1.2. Ball mill at 300 rpm until the particle size is 2-4 μm to obtain the coating slurry. Separately, weigh out 50 parts of α-alumina, 2.5 parts of Gd2Zr2O7, 2.0 parts of cerium oxide, 0.8 parts of strontium oxide, and 2 parts of feldspar powder by weight. Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:1.5:1.2. Ball mill at 300 rpm until the particle size is 4-10 μm to obtain the core layer slurry.

[0027] 2. Spray dry the obtained core layer slurry to obtain particles, and then immerse them in the coating layer slurry (the immersion solid-liquid ratio is 1:1.2 based on the total weight ratio of the solid raw materials used to prepare the particles and the coating layer slurry), and ultrasonically stir for 20 min; spray dry the resulting mixed slurry to obtain composite particles for later use.

[0028] 3. Weigh out 54 parts of Jiepai mud, 20 parts of Changfeng mud, 60 parts of calcined coal gangue, 45 parts of calcined high-alumina bauxite, 40 parts of wollastonite, 20 parts of feldspar powder, 4 parts of quartz powder, 5 parts of fly ash, and 0.5 parts of aluminum silicate fiber according to the following weight proportions: Mix the raw materials and add water at a ratio of 1:3:1.5 for ball milling at 500 rpm for 48 hours. After passing through a 300-mesh sieve, add 3 parts of the resulting composite particles and ultrasonically stir for 30 minutes. Dehydrate to a moisture content of 15% and age for 48 hours to obtain the green body slurry.

[0029] 4. Weigh out 30 parts feldspar powder, 5 parts talc powder, 10 parts Jiepai clay, 7 parts Changfeng clay, 6 parts zirconium silicate, 16 parts quartz powder, 8 parts waste porcelain powder, and 3 parts calcite according to the following weight proportions: Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:3:1.5. Ball mill at 500 rpm until the particle size is 1-3 μm. Aging for 48 hours yields a glaze slurry (adjust specific gravity to 1.6 g / m³). 3 The slurry is injected into a mold and cold isostatically pressed to obtain a green body. A glaze slurry (0.1 mm) is sprayed onto the surface of the green body, and after drying, it is transferred to an atmosphere furnace (under forced air, O24%): first, the temperature is raised to 1120℃ at 4℃ / min and held for 40 min; then, the temperature is raised to 1260℃ at 3℃ / min and held for 2 h; the green body is cooled in the furnace to obtain the green body; the fired porcelain part is glued to the steel cap and steel foot to obtain the finished porcelain insulator.

[0030] Example 3 A method for preparing a high-strength porcelain insulator, comprising the following steps: 1. Weigh out 52 parts by weight of Changfeng mud, 35 parts by weight of α-alumina, 5 parts by weight of titanium oxide, 4 parts by weight of magnesium oxide, 1 part by weight of boron oxide, and 12 parts by weight of aluminum silicate fiber. Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:1.5:1.2 and ball mill at 300 rpm until the particle size is 2-4 μm to obtain the coating slurry. Separately, weigh out 58 parts by weight of α-alumina, 75.0 parts by weight of Gd2Zr2O, 3.5 parts by weight of cerium oxide, 2.0 parts by weight of strontium oxide, and 3 parts by weight of feldspar powder. Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:1.5:1.2 and ball mill at 300 rpm until the particle size is 4-10 μm to obtain the core layer slurry.

[0031] 2. Spray dry the obtained core layer slurry to obtain particles, and then immerse them in the coating layer slurry (the immersion solid-liquid ratio is 1:1.5 based on the total weight ratio of the solid raw materials used to prepare the particles and the coating layer slurry), and ultrasonically stir for 20 min; spray dry the resulting mixed slurry to obtain composite particles for later use.

[0032] 3. Weigh out 60 parts of Jiepai mud, 25 parts of Changfeng mud, 75 parts of calcined coal gangue, 65 parts of calcined high-alumina bauxite, 50 parts of wollastonite, 30 parts of feldspar powder, 10 parts of quartz powder, 10 parts of fly ash, and 3 parts of aluminum silicate fiber according to the following weight proportions: Mix the raw materials and add water at a material-to-water ratio of 1:3:1.5 for ball milling at 500 rpm for 48 hours. After passing through a 300-mesh sieve, add 8 parts of the resulting composite particles and ultrasonically stir for 30 minutes. Dehydrate to a moisture content of 15% and age for 48 hours to obtain the green body slurry.

[0033] 4. Weigh out 35 parts feldspar powder, 10 parts talc powder, 14 parts Jiepai clay, 10 parts Changfeng clay, 8 parts zirconium silicate, 20 parts quartz powder, 12 parts waste porcelain powder, and 5 parts calcite according to the following weight proportions: Mix the raw materials and add water at a material-to-ball-to-water ratio of 1:3:1.5. Ball mill at 500 rpm until the particle size is 1-3 μm. Aging for 48 hours yields a glaze slurry (adjust specific gravity to 1.6 g / m³). 3 The slurry is injected into a mold and cold isostatically pressed to obtain a green body. A glaze slurry (0.3 mm) is sprayed onto the surface of the green body. After drying, it is transferred to an atmosphere furnace (under forced air, O24%): first, the temperature is raised to 1180℃ at 4℃ / min and held for 20 min; then, the temperature is raised to 1310℃ at 3℃ / min and held for 1 h; the green body is cooled in the furnace to obtain the green body; the fired porcelain part is glued to the steel cap and steel foot to obtain the finished porcelain insulator.

[0034] Comparative Example 1 The only difference from the steps in Embodiment 1 of this invention is that Gd2Zr2O7 is not added in step 1 to prepare the core layer slurry.

[0035] Comparative Example 2 According to the step parameters of Embodiment 1 of the present invention, the only difference is that in step 1, no coating layer slurry is prepared, and the particles obtained by spray drying the core layer slurry in step 2 are used directly in step 3 to prepare the green body slurry instead of the composite particles.

[0036] Comparative Example 3 According to the step parameters of Embodiment 1 of the present invention, the only difference is that the composite particles obtained in step 2 are directly mixed with the raw material of the blank and ball-milled with water.

[0037] Test case The performance of the insulator samples prepared in the above embodiments and comparative examples was tested, and the results are shown in Table 1 (bending strength test according to GB / T 4741-1999; volume resistivity test according to GB / T 31838.2-2019; porosity at 20 MPa dyeing solution penetration depth; fracture toughness test according to GB / T 23806-2025; thermal shock resistance test according to GB / T 1001.1-2021).

[0038] Table 1 Performance test results of insulator samples

[0039] In summary, the multi-element raw material system selected in this invention overcomes the shortcomings and defects of the traditional ternary system. The prepared porcelain insulator exhibits significantly improved bending strength and a slight increase in fracture toughness, while its volume resistivity reaches 5×10⁻⁶. 15Porosity above Ω·m demonstrates a significant improvement in density, ensuring the stability of volume resistivity after moisture absorption. Comparative Example 1 shows that the lack of core linkage from Gd₂Zr₂O₇, while ensuring excellent fracture toughness, prevents the interaction of various materials, resulting in a substantial decrease in strength, volume resistivity, and density. Comparative Example 2 shows that directly mixing the spray-dried particles of the core layer slurry into the billet raw material system, due to the lack of a transition buffering effect from the coating layer, may lead to matrix interface and dispersion problems, resulting in varying degrees of performance degradation for the insulators. Comparative Example 3 shows that adding composite particles before ball milling the billet raw materials also disrupts the transition buffering effect of the coating layer, causing interface and dispersion problems, damaging the interaction of the raw material system, and leading to a significant decrease in insulator performance.

[0040] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they are not intended to limit the present invention. It should be noted that various changes and modifications can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a high-strength insulator, characterized in that, Includes the following steps: Step 1: Using Changfeng mud, α-alumina, titanium oxide, magnesium oxide, boron oxide, and aluminum silicate fiber as coating layer raw materials, and α-alumina, gadolinium zirconate, cerium oxide, strontium oxide, and feldspar powder as core layer raw materials, the coating layer slurry and core layer slurry are obtained by ball milling with water respectively; the core layer slurry is spray-dried to obtain granules, which are then immersed in the coating layer slurry and thoroughly mixed. The resulting mixed slurry is then spray-dried to obtain composite granules for later use. Step 2: Take Jiepai mud, Changfeng mud, calcined coal gangue, calcined high-alumina bauxite, wollastonite, feldspar powder, quartz powder, fly ash, and aluminum silicate fiber, mix them, add water and ball mill, sieve them, add composite particles and mix thoroughly, dehydrate and age to obtain the green body slurry. Step 3: Inject the blank slurry into the mold, press the blank to obtain a green blank, apply glaze to the surface of the blank and fire it, and finally glue it to the metal parts to obtain the finished insulator.

2. The method for preparing a high-strength insulator according to claim 1, characterized in that, The coating material in step one is as follows by weight: 40-52 parts of Changfeng mud, 25-35 parts of α-alumina, 1-5 parts of titanium dioxide, 2-4 parts of magnesium oxide, 0.6-1 parts of boron oxide, and 8-12 parts of aluminum silicate fiber.

3. The method for preparing a high-strength insulator according to claim 1, characterized in that, The core layer raw materials in step one are as follows by weight: 50-58 parts α-alumina, 2.5-5.0 parts gadozirconate, 2.0-3.5 parts cerium oxide, 0.8-2.0 parts strontium oxide, and 2-3 parts feldspar powder.

4. The method for preparing a high-strength insulator according to claim 1, characterized in that, After ball milling in step one, the particle size of the coating slurry is 2-4 μm, and the particle size of the core slurry is 4-10 μm.

5. The method for preparing a high-strength insulator according to claim 1, characterized in that, In step one, the solid-liquid ratio of the particles obtained by spray drying the core layer slurry to the coating layer slurry is 1:(1.2-1.5) based on the total weight ratio of the solid raw materials used to prepare the particles and the coating layer slurry.

6. The method for preparing a high-strength insulator according to claim 1, characterized in that, The raw materials for the green body in step two are as follows by weight: 54-60 parts of Jiepai clay, 20-25 parts of Changfeng clay, 60-75 parts of calcined coal gangue, 45-65 parts of calcined high-alumina bauxite, 40-50 parts of wollastonite, 20-30 parts of feldspar powder, 4-10 parts of quartz powder, 5-10 parts of fly ash, 0.5-3 parts of aluminum silicate fiber, and 3-8 parts of composite particles.

7. The method for preparing a high-strength insulator according to claim 1, characterized in that, The glaze formula used in step three is as follows: 30-35 parts feldspar powder, 5-10 parts talc powder, 10-14 parts Jiepai clay, 7-10 parts Changfeng clay, 6-8 parts zirconium silicate, 16-20 parts quartz powder, 8-12 parts waste porcelain powder, and 3-5 parts calcite.

8. The method for preparing a high-strength insulator according to claim 1, characterized in that, The thickness of the glaze layer applied in step three is 0.1-0.3 mm.

9. The method for preparing a high-strength insulator according to claim 1, characterized in that, The firing parameters in step three are as follows: under an oxidizing atmosphere, first heat to 1120-1180℃ and hold for 20-40 min; then continue to heat to 1260-1310℃ and hold for 1-2 h; finally cool with the furnace to obtain the final product.

10. A high-strength insulator obtained by the preparation method according to any one of claims 1-9.

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