Preparation method of glaze powder for super high voltage porcelain insulator

Abstract

The application relates to the technical field of electric porcelain insulators, and particularly discloses a use method of glaze powder for superhigh-voltage porcelain insulators, which comprises the following steps: S1, configuring glaze material, wherein the glaze material comprises the following raw materials in parts by mass: microclin 10-20 parts, soda feldspar 10-20 parts, high-plasticity clay 5-15 parts, kaolin 7-12 parts, calcined talc 10-14 parts, wollastonite 4-10 parts, quartz powder 15-25 parts, zirconium silicate 6-10 parts and aluminum oxide 2-6 parts; S2, grinding the raw materials in step S1 to obtain fine powder; and S3, removing coarse particles and iron impurities in the fine powder to obtain glaze powder. The scheme is used to improve the bending strength of the porcelain insulator, so that the bending strength of the porcelain insulator can reach 220 MPa-233 MPa.

Description

Technical Field

[0001] This invention relates to the field of electrical porcelain insulator technology, specifically to a method for preparing glaze powder for ultra-high voltage porcelain insulators. Background Technology

[0002] With the development of the national economy and the improvement of electrification levels, electricity has become increasingly prominent in the energy sector, and power security has gradually become one of the core elements of the new energy security strategy. Due to the surge in electricity consumption, the proportion of electricity on the consumer side will gradually increase. Faced with ever-growing electricity demand, the task of ensuring a stable power supply remains arduous. To meet the needs of high-voltage transmission projects, porcelain insulators are classified into high-voltage insulators and ultra-high-voltage insulators according to their application scope. Currently, the highest-grade ultra-high-voltage insulator is the high-strength aluminum porcelain insulator. Because the scope of ultra-high voltage is very wide, the bending strength requirement for high-strength aluminum porcelain insulators before glazing is no less than 140MPa, and after glazing, it needs to be no less than 160MPa. However, with the development of the electrical era, the porcelain industry is also constantly evolving. For high-voltage transmission projects with even higher pressures (500 kV-1000 kV) in ultra-high voltage, the bending strength requirements for insulators are even higher.

[0003] Currently, there is increasing research on insulators in the industry, and our company has also conducted in-depth research on porcelain insulators. For glazed materials, we can achieve a bending strength of over 200MPa after glazing. However, because porcelain insulators need to be fixedly installed, they must be used in conjunction with metal parts. For example, suspension porcelain insulators need to be used with iron caps and steel feet. To improve the bonding strength between the iron caps, steel feet and porcelain insulators, sand is often applied to the surface of the insulator where the iron caps and steel feet are installed to increase the friction coefficient of the porcelain insulators, thereby improving the connection strength between the iron caps, steel feet and porcelain insulators. However, because sand has low strength and a large difference in thermal expansion coefficient compared to porcelain insulators, the overall bending strength of porcelain insulators that originally achieved a bending strength of over 200MPa after glazing actually decreases under thermal stress, resulting in a decline in the electromechanical performance of porcelain insulators.

[0004] In existing technologies, to improve the strength of porcelain insulators after sand coating, it has been proposed to treat the porcelain sand before coating, such as by coating the surface of the porcelain sand with glaze. This allows the glazed porcelain sand to be surrounded by the glaze after sintering, providing compressive stress to the inside of the insulator and thus improving the mechanical strength and bonding strength of the porcelain insulator. However, while this glazed sand coating helps improve the mechanical strength of porcelain insulators, current ultra-high voltage power transmission projects require insulators with even higher mechanical strength to meet the more demanding application requirements. Summary of the Invention

[0005] The present invention aims to provide a method for preparing glaze powder for ultra-high voltage porcelain insulators, so as to improve the bending strength of porcelain insulators, enabling the bending strength of porcelain insulators to reach 220MPa-233MPa.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing glaze powder for ultra-high voltage porcelain insulators includes the following steps: S1. Prepare the glaze, which contains the following raw materials in parts by weight: 10-20 parts microcline, 10-20 parts albite, 5-15 parts high plasticity clay, 7-12 parts kaolin, 10-14 parts calcined talc, 4-10 parts wollastonite, 15-25 parts quartz powder, 6-10 parts zirconium silicate, and 2-6 parts alumina. S2. Grind the raw materials from step S1 to obtain fine powder; S3. Remove coarse particles and iron impurities from the fine powder to obtain glaze powder.

[0007] Preferably, as an improvement, the glaze needs to be ground into a glaze slurry first, then pressed into a glaze cake, and then dried and ground into fine powder.

[0008] Preferably, as an improvement, the glaze slurry needs to be sieved to remove large particles and iron removal is performed on the glaze slurry before it is pressed into glaze cake.

[0009] Preferably, as an improvement, the fineness of the glaze powder is less than 80 micrometers.

[0010] Preferably, as an improvement, the microcline is 10-18 parts and the albite is 12-20 parts. This scheme enables the glaze formula to reduce the melting temperature of the glaze, reduce the high-temperature viscosity of the glaze and increase the gloss of the glaze, while also minimizing the impact on the chemical stability of the glaze. It ensures that the expansion coefficient of the glaze can match both the blank and the porcelain sand used for subsequent sanding. This ensures that the bending strength of the umbrella after one glaze dipping is significantly improved relative to the blank, and that the bending strength of the blank can still be greatly improved after the glaze is coated with porcelain sand.

[0011] Preferably, as an improvement, the calcined talc is 10-12 parts; by controlling the amount of calcined talc, the calcined talc can improve the mechanical strength and thermal stability of the glaze, and is conducive to combining with other raw materials to control the annual growth of the glaze within a reasonable range, thus ensuring the excellent quality of the glaze surface after the porcelain is fired.

[0012] Preferably, as an improvement, the quartz powder is 17-22 parts. By controlling the quartz powder, the silica content in the glaze glass is increased, which acts as a skeleton and helps to reduce the expansion coefficient of the glaze and improve the wear resistance, hardness, strength, whiteness, transparency and chemical stability of the glaze surface.

[0013] Preferably, as an improvement, the chemical composition of the glaze powder includes: 60-72% SiO2, 14-17% Al2O3, less than 0.7% Fe2O3, 3-4% CaO, 3-5% MgO, 2-3.5% K2O, 1.5-3% Na2O, and 4-7% ZrO2.

[0014] The principle and advantages of this scheme are as follows: The glaze powder in this scheme is used to coat the surface of the porcelain sand before applying sand to the porcelain insulator. The glaze powder on the surface of the porcelain sand combines with the glaze applied to the porcelain insulator after the porcelain insulator is sintered, thereby greatly improving the bending strength of the porcelain insulator. This solution improves the glaze formula, controlling the content of aluminum dioxide, calcium oxide, magnesium oxide, sodium oxide, zirconium oxide, etc., within a very suitable range. Through the synergistic effect of the raw materials, the excellent effects of each material are maximized (combining the glaze's viscosity, high-temperature fluidity, suspension properties, gloss, and strength), resulting in the most ideal overall effect. Furthermore, the glaze powder prepared under this formula can achieve a bending strength far exceeding existing technologies when applied to the blank (allowing high-strength aluminum porcelain insulators to reach 220MPa, or even 233.7MPa, after glazing and sanding, based on a blank bending strength of 170MPa), greatly improving the bending strength of the suspended porcelain after sanding. Additionally, the glaze slurry from the glaze powder preparation process can be used for a single glazing of the head umbrella of the blank, thus greatly simplifying the manufacturing process of suspended porcelain to meet ultra-high voltage requirements and reducing manufacturing costs.

[0015] This invention also provides a method for using glaze powder for ultra-high voltage porcelain insulators, comprising the following steps: I. Mix the glaze powder and porcelain sand evenly; II. While the porcelain sand and glaze powder are being stirred evenly, glue is added continuously, so that the glue and glaze powder coat the porcelain sand, forming a glazed sand with an inner layer of porcelain sand, a middle layer of glaze powder, and an outer layer of glue.

[0016] Furthermore, as an improvement, step III is also included, which involves applying glaze-containing adhesive to the head of the glazed blank that has already been glazed once. The glaze-containing adhesive is made by mixing glaze powder and adhesive. After applying the glaze-containing adhesive, glaze-coating sand is applied to the surface of the glaze-containing adhesive to obtain a glazed and sand-coated blank.

[0017] Furthermore, as an improvement, the porcelain insulators that have been coated with glaze sand are placed in a kiln for firing to obtain ultra-high voltage porcelain insulators.

[0018] This invention produces glazed sand using glaze powder, porcelain sand, and adhesive. The glaze powder is first mixed with the porcelain sand, causing a layer of glaze powder to coat the inner surface of the porcelain sand. Then, with the addition of adhesive, the glaze powder is further coated. Any glaze powder that did not adhere during the mixing process is also incorporated into the adhesive, forming a glazed adhesive layer. This increases the amount of glaze powder coating the porcelain sand (making the glazed sand structure have porcelain sand at the center, glaze powder in the middle layer, and glazed adhesive on the outer layer). This improves the coating strength of the glaze on the porcelain sand after subsequent firing and allows for a gradual transition in the coefficient of thermal expansion of the porcelain insulator surface, contributing to improved bending strength.

[0019] Furthermore, in this invention, when using glaze powder, the glaze powder is mixed with glue and then used for glue coating before sanding. This allows the glaze in the glue to approach the glaze layer of the blank due to the water absorption of the blank. The glaze-coating sand adheres to the glaze-containing glue layer by filling, extrusion, or sandblasting. Under extrusion or spraying pressure, the glaze-coating sand is embedded into the glaze-containing glue layer, and may even come into contact with the glaze on the blank. Thus, before firing, the glaze is distributed in the inner, middle, and outer layers of the porcelain insulator, without any glaze breakage. During sintering, the glaze, glaze and sand, and glaze and blank are connected to form a whole through physical and chemical reactions, which erode, diffuse, and react with each other. This ensures that there are no problems such as sand falling off, sand missing, or sand separation during the sintering process, and greatly improves the bending strength of the porcelain insulator after sanding. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the manufacturing process of glaze powder for ultra-high voltage porcelain insulators according to an embodiment of the present invention.

[0021] Figure 2 It is an inverted suspension porcelain insulator.

[0022] Figure 3 This is a cross-sectional view of a glazed sand structure made using the glaze powder, adhesive, and porcelain sand of this invention. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings of the instruction manual include: porcelain sand 1, glaze powder 2, and glue 3.

[0024] Combination Figure 1 A method for preparing glaze powder for ultra-high voltage porcelain insulators includes the following steps: S1. Prepare the glaze, which contains the following raw materials in parts by weight: 10-20 parts microcline, 10-20 parts albite, 5-15 parts high plasticity clay (Ordos clay is used in this embodiment), 7-12 parts kaolin, 10-14 parts calcined talc, 4-10 parts wollastonite, 15-25 parts quartz powder, 6-10 parts zirconium silicate, and 2-6 parts alumina.

[0025] S2. Grind the raw materials from step S1 to obtain fine powder. Specifically, first, use wet ball milling to obtain glaze slurry, then sieve the glaze slurry to remove iron, then press the glaze slurry into glaze cake, then put the glaze cake into an oven to dry, then coarsely crush the dried glaze cake to obtain glaze fragments, and then grind the glaze fragments into fine powder using a disc pulverizer.

[0026] S3. Remove coarse particles and iron impurities from the fine powder to obtain glaze powder with a fineness of less than 80 micrometers.

[0027] The chemical composition of the glaze powder obtained by the above method is as follows:

[0028] The aforementioned glaze powder can be used to glaze the surface of porcelain insulators, or it can be used to form a glaze-coating sand with porcelain sand before sanding. It can also be mixed into the adhesive used during sanding, so that the adhesive on the glazed blank before sanding is glaze-containing adhesive. Specifically, taking the glazing of suspension porcelain insulators as an example, the glazing process of suspension porcelain insulators using glaze powder includes the following steps: Step 1: First glazing of the porcelain insulator head umbrella: Take the glaze slurry that has been sieved and had iron removed during the glaze powder manufacturing process (the sieve is 360 mesh, the residual weight after sieving is 0.05%~0.18%, and the specific gravity of the glaze slurry is 1.45~1.55 g / cm³). 3 Then, the head and umbrella-shaped parts of the unglazed blank are completely immersed in the glaze slurry. The glaze is applied to the entire inside and outside of the ceramic insulator by immersion glazing, resulting in a glazed blank. In this step, because the sintered blank has a very high water absorption rate, the glaze adheres to the surface of the blank after immersion in the glaze slurry due to water absorption. The glaze immersion requirements are: the glaze thickness is controlled at 0.25-0.60 mm, and the immersion time is 5-7 seconds.

[0029] Step Two: Applying Glaze Sand to the Glazed Body: Apply glue to the head of the glazed body, then apply glaze sand mixed with glaze powder onto the glued glazed body, resulting in a glazed and sanded body. The specific steps of this step are as follows: 1. Mix dry glaze powder with a fineness of less than 80 micrometers with porcelain sand evenly. In this embodiment, the mass ratio of porcelain sand to glaze powder is controlled at 1:(0.6~0.9). The porcelain sand is C130 porcelain with a particle size of 0.8~1.5mm.

[0030] II. While the porcelain sand and glaze powder are thoroughly mixed, continue stirring and gradually add glue. This allows the glue to coat the glaze powder onto the porcelain sand, forming a glaze-coated sand layer with an inner layer of porcelain sand, a middle layer primarily composed of glaze powder, and an outer layer mainly composed of glue (e.g., ...). Figure 3 As shown in the figure, this step yields glazed sand with distinct particles and a certain degree of stickiness, coated with glaze. The particle size of the glazed sand is 1.4 to 1.8 mm. During the preparation of the glazed sand, the mass of the glue is 1 / 4 to 1 / 3 times the mass of the glaze powder.

[0031] During the preparation and preparation of the glazed sand, the glazed sand is tightly covered with a container to prevent it from drying out and to ensure that the surface of the glazed sand is sticky when used.

[0032] III. Apply glue to the inside and outside of the head of the glazed blank. The glue is mixed with glaze slurry (glaze slurry after iron removal during glaze powder production). The mass ratio of glaze slurry to glue in the glaze-containing glue is controlled at 1:(0.8~1.1). The glaze slurry used is the same as that used in the first glazing of the head umbrella. The glue used in this step and the glue used in the glaze coating sand are both commonly used sanding glues in the industry, such as CMC glue. Then, apply the glaze coating sand to the outer and inner surfaces of the head of the glazed blank by filling or sandblasting. In this step, the outermost layer of the glaze coating sand is a glue layer, which is sticky. The glaze-containing glue also has high viscosity, which allows the glaze coating sand to adhere evenly to the surface of the head of the glazed blank (no sand falling off, no sand piling up, no sand shortage, good uniformity), resulting in a glazed and sanded blank.

[0033] Step 3: Place the glazed and sand-coated blanks in a drawer kiln for glazing and firing, and then cool to room temperature to obtain high-grade suspended porcelain. This high-grade suspended porcelain can be used in ultra-high voltage and even extra-high voltage power transmission projects.

[0034] The glazed and sanded porcelain insulators produced using the above method can form an inner glaze layer, a middle glaze adhesive layer, and an outer glaze sand layer at the head of the blank. Because the glaze sand is embedded into the middle and inner layers under mutual pressure or the force of sandblasting, the glazes between the layers erode, diffuse, and react with each other after sintering, forming a unified whole. The inner, middle, and outer layers can be well bonded, and the outer layer of porcelain sand is encased in glaze, ensuring the smoothness and flatness of the exposed glaze surface of the porcelain insulator, while also making the porcelain sand stable and maintaining a high roughness in the sanded area. Furthermore, the application of glaze in the inner, middle, and outer layers allows for a gradual transition between the glaze and sand on the surface of the insulator head, thus ensuring a small difference in the coefficient of expansion and greatly reducing the formation of thermal stress. In addition, the coordinated proportions of the raw materials in the glaze enable the resulting insulator to achieve a bending strength of 220-233.7 MPa, far exceeding existing technologies. Moreover, the umbrella-shaped part of the resulting insulator is smooth and flat, free of pinholes and color differences, and exhibits good wear resistance and corrosion resistance. This not only avoids the problem of reduced bending strength after sanding the head of the suspended porcelain in existing technologies, but also achieves a breakthrough in the bending strength of the suspended porcelain. In addition, it can utilize the glaze slurry from the glaze powder production process to achieve one-time glazing of the head of the blank, greatly simplifying the manufacturing process of suspended porcelain that meets ultra-high pressure requirements and reducing manufacturing costs.

[0035] In this embodiment, multiple experimental and control groups were tested to obtain the glaze formula for the suspended porcelain with the aforementioned flexural strength. The specific composition of each raw material is as follows: Microcline was selected from Shaanxi Province, and its main chemical analysis parameters are as follows:

[0036] The sodium feldspar used is from Linxiang, and its main chemical analysis indicators are as follows:

[0037] Ordos clay is a type of clay with a high hydration rate, averaging 95%. It is also a highly plastic clay with an average binding strength of around 5.0 MPa. Its main chemical control indicators are as follows:

[0038] The kaolin used is from Xianyang, which is a medium-to-low plastic clay with an average binding strength of about 0.5 MPa. Its main chemical control indicators are as follows:

[0039] Calcined talc from Zichuan was used, and its main chemical analysis parameters are as follows:

[0040] The wollastonite used is from Luzhou, and its main chemical analysis parameters are as follows:

[0041] The quartz powder used is from Jiangxi Province, and its main chemical analysis control indicators are as follows:

[0042] Zirconium silicate using Huaan Zirconium silicate has the following key chemical control indicators:

[0043] The alumina used is Kaiyuan alumina, and its main chemical analysis control indicators are as follows:

[0044] The specific test data is as follows: Table 1 - Comparative experimental data before and after changes in microcline dosage

[0045] Table 2 - Comparative experimental results before and after changes in microcline dosage

[0046] As can be seen from Tables 1 and 2, changing the amount of microcline and albite will not only reduce the overall bending strength of the suspended porcelain, but also cause problems such as poor smoothness and pinholes.

[0047] Table 3 - Comparative experimental data before and after changes in calcined talc dosage

[0048] Table 4 - Comparative experimental results before and after changes in calcined talc dosage

[0049] As can be seen from Tables 3 and 4, both excessive and insufficient calcined talc content will result in insufficient high-temperature fluidity. Consequently, after glazing and sanding, the suspended porcelain will not only have a strength below 200 MPa and poor smoothness, but also, due to excessive calcined talc content, more and overlapping crystals will occur, resulting in a dull glaze and color difference.

[0050] Table 5 - Comparative experimental data before and after changes in wollastonite dosage

[0051] Table 6 - Comparative experimental results before and after changes in wollastonite dosage

[0052] As shown in Tables 5 and 6, when the wollastonite content is too low and the clay content is too high, the relative viscosity of the glaze is too high, while the high-temperature fluidity is too low, resulting in the suspended porcelain after firing being both rough and having pinholes. When the wollastonite content is too high, the relative viscosity is greatly reduced and the high-temperature fluidity is greatly increased, solving the problems of roughness and pinholes. However, glaze bubbles are easily generated, which leads to a significant decrease in wear resistance and corrosion resistance. Moreover, the flexural strength of the suspended porcelain after firing can only reach a maximum of about 194 MPa, which does not break through the existing flexural strength of suspended porcelain.

[0053] Table 7 - Comparative experimental data before and after changes in quartz powder dosage

[0054] Table 8 - Comparative experimental results before and after changes in quartz powder dosage

[0055] As shown in Tables 7 and 8, when the quartz powder content is too low, the relative viscosity of the glaze increases, and the high-temperature fluidity at the lower firing position deteriorates, resulting in poor smoothness and flatness of the fired porcelain and the presence of pinholes. At the same time, the flexural strength cannot be improved. When the quartz powder content is too high and the clay content is too low, although the glaze surface of the umbrella part is smooth and flat, without pinholes, and has good wear resistance and corrosion resistance, its flexural strength has just exceeded 200 MPa, and the flexural strength has not been significantly improved. In addition, there is still a color difference problem.

[0056] Table 9 - Comparative experimental data before and after changes in zirconium silicate dosage

[0057] Table 10 - Comparative experimental results before and after changes in zirconium silicate dosage

[0058] As shown in Tables 9 and 10, when the zirconium silicate content is too low, the relative viscosity of the glaze is too high and the high-temperature fluidity at the lower firing position is too low, resulting in suspended porcelain after firing, with problems such as strength of less than 200 MPa, pinholes, color difference, and poor wear resistance and corrosion resistance. When the zirconium silicate content is too high, although there is no color difference on the surface and the wear resistance and corrosion resistance are quite good, problems such as roughness, pinholes, and even glaze shrinkage occur, and the bending strength is also less than 210 MPa, making it impossible to achieve a breakthrough in bending strength.

[0059] It should be noted that due to the large amount of experimental data, not all results are presented. Through comparative research, it was found that controlling the alumina content between 2 and 6 parts per liter ensures minimal impact on the overall effect while keeping other components constant, guaranteeing the quality of the glaze and ensuring flexural strength. However, excessively low alumina content will reduce the glaze's effectiveness. of Hardness, but excessive use will reduce the high-temperature fluidity of the glaze. thereby This reduces the quality of the glaze.

[0060] Based on the experimental data above, it can be seen that the formula of this invention, through the control of the amounts of microcline, albite, Ordos clay, kaolin, calcined talc, wollastonite, quartz powder, zirconium silicate, and alumina, enables the glaze prepared under this formula to achieve a bending strength far exceeding that of existing technologies when applied to the blank. This allows the high-strength aluminum porcelain insulator to reach 220 MPa, or even 233.7 MPa, on top of the blank's bending strength of 170 MPa, after glazing and sanding, greatly improving the bending strength of the suspended porcelain after sanding. Furthermore, it allows for one-time glazing of the head umbrella during the first glazing of the blank, greatly simplifying the glazing process and reducing production costs for enterprises. In addition, the resulting suspended porcelain can also guarantee a smooth and flat surface, no color difference, and good wear resistance and corrosion resistance.

[0061] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method of using a glaze powder for an ultra-high voltage porcelain insulator, characterized by, The steps include the following: S1. Prepare the glaze, which is composed of the following raw materials in parts by weight: 10-20 parts microcline, 10-20 parts albite, 5-15 parts high plasticity clay, 7-12 parts kaolin, 10-14 parts calcined talc, 4-10 parts wollastonite, 15-25 parts quartz powder, 6-10 parts zirconium silicate, and 2-6 parts alumina. S2. Grind the raw materials from step S1 to obtain fine powder; S3. Remove coarse particles and iron impurities from the fine powder to obtain glaze powder; The chemical composition of the glaze powder is as follows: SiO2 accounts for 60-72%, Al2O3 accounts for 14-17%, Fe2O3 accounts for less than 0.7%, CaO accounts for 3-4%, MgO accounts for 3-5%, K2O accounts for 2-3.5%, Na2O accounts for 1.5-3%, ZrO2 accounts for 4-7%, and IL accounts for 3.5-7.0%. The total chemical composition of the glaze powder is 100%. It also includes the following steps: I. Mix the glaze powder and porcelain sand evenly; II. While the porcelain sand and glaze powder are being stirred evenly, glue is added continuously so that the glue coats the glaze powder onto the porcelain sand, forming a glazed sand with an inner layer of porcelain sand, a middle layer of glaze powder, and an outer layer of glaze-coated glue.

2. The method of using the glaze powder for ultra-high voltage porcelain insulators according to claim 1, characterized in that: The glaze material described in step S2 needs to be ground into glaze slurry first, then pressed into glaze cake, and then dried and ground into fine powder.

3. The method of using the glaze powder for ultra-high voltage porcelain insulators according to claim 2, characterized in that: Before being pressed into glaze cakes, the glaze slurry needs to be sieved to remove large particles and iron needs to be removed.

4. The method of using the glaze powder for ultra-high voltage porcelain insulators according to any one of claims 1-3, characterized in that: The fineness of the glaze powder is less than 80 micrometers.

5. The method of using the glaze powder for ultra-high voltage porcelain insulators according to any one of claims 1-3, characterized in that: The microcline is 10-18 parts and the albite is 12-20 parts.

6. The method of using the glaze powder for ultra-high voltage porcelain insulators according to any one of claims 1-3, characterized in that: The calcined talc is 10-12 parts.

7. The method of using the glaze powder for ultra-high voltage porcelain insulators according to any one of claims 1-3, characterized in that: The amount of quartz powder is 17-22 parts.

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