A rare earth doped electric porcelain, a preparation method and application thereof

Abstract

The application provides a rare earth doped electric porcelain and a preparation method and application thereof. The electric porcelain comprises the following preparation raw materials: aluminum oxide, ceramic powder, quartz, titanium white powder, a rare earth dopant, a dispersing agent and a forming agent. The forming agent comprises the following preparation raw materials: modified aluminum silicate, silicone rubber, isopropyl trioleic acyloxy titanate and isocyanate. The rare earth dopant comprises the following preparation raw materials: diyttrium trioxide and lanthanum stearate. In the application, the electric porcelain material with excellent mechanical properties is prepared through the collocation of the preparation raw materials.

Description

Technical Field

[0001] This application relates to the field of electrical porcelain technology, and in particular to a rare earth-doped electrical porcelain, its preparation method and application. Background Technology

[0002] For a power system to transmit electrical energy from power plants to distant users, two conditions must be met: first, mechanical support must be provided for the conductors carrying the current; second, sufficient insulation distance must be provided between the high-voltage end and the ground. Insulators possess both of these basic functions, thus occupying an extremely important position in the power system.

[0003] Porcelain insulators, relying on their superior mechanical, electrical, thermal, and chemical corrosion resistance properties, have always held a dominant position in the insulator industry. During operation, porcelain insulators must withstand not only the forces exerted on their axis by conductor tension, wind force, and the electrodynamic forces of short-circuit currents, but also the weight of electrical components, their own weight, and the effects of natural environmental factors such as earthquakes, freezing, and sudden temperature changes. Furthermore, with the development of power grids towards ultra-high voltage and extra-high voltage levels, the forces that insulators need to withstand are increasing, thus placing higher demands on the mechanical strength of post porcelain insulators for the safe and stable operation of power systems.

[0004] Application content

[0005] This application is made in view of the above-mentioned problems, and its purpose is to provide a rare earth-doped electrical porcelain with high mechanical strength.

[0006] Specifically, the first aspect of this application provides a rare earth-doped electrical porcelain, comprising the following raw materials:

[0007] Alumina, ceramic powder, quartz, titanium dioxide, rare earth dopants, dispersants and forming agents;

[0008] The molding agent comprises the following raw materials:

[0009] Modified aluminum silicate, silicone rubber, isopropyltrioleoyl titanate and isocyanate;

[0010] The rare earth dopant comprises the following raw materials:

[0011] Yttrium trioxide and lanthanum stearate.

[0012] According to one of the technical solutions in this application, at least the following beneficial effects are achieved:

[0013] The raw materials used in this application include alumina and quartz, and rare earth dopants are also added to improve the microstructure and thermal properties of the electrical porcelain, making the porcelain tougher and thus increasing the mechanical strength of the product.

[0014] The strength of electrical porcelain materials depends not only on the strength and content of the crystalline phase itself, but also on the distribution and appropriate texture of the crystalline phase within the material. This is due to the presence of rare earth ions (Y). 3+ Radius 9.3 nm, La 3+ (radius 10.6 nm) and aluminum ions (Al) 3+ The radii (5.0 nm) vary greatly; rare earth oxides are difficult to dissolve in Al2O3, thus they, together with other grain boundary second phases, jointly inhibit grain growth, forming a dense and uniform microstructure and improving the mechanical properties of the material. Rare earth ions play roles in grain refinement, solid solution strengthening, and self-toughening reinforcement in the microstructure of electrical porcelain materials. From a macroscopic perspective, adding rare earth oxides can lower the sintering temperature of Al2O3 ceramics, improve the microstructure, and increase mechanical strength.

[0015] Meanwhile, yttrium oxide in rare earth forming agents is a network intermediate, Y 3+ It is a network-modified ion. The introduction of yttrium oxide increases the active oxygen in the melt, which increases the O / Si ratio and reduces the size of the silicon-oxygen complex anion groups, resulting in a decrease in melt viscosity. This promotes the formation of crystal nuclei, thus increasing the tendency of the ceramic body to produce crystalline mullite and decreasing the tendency to form a glassy phase. As the mullite content increases, the density of the ceramic body increases, thereby improving the strength of the ceramic body.

[0016] Rare earth dopants and alumina tend to form low-melting-point chemicals at high temperatures. These low-melting-point compounds tend to form a liquid phase on the surface of the base particles. These liquid phase structures can wet the base particles and fill the pores between the particles, promote the discharge of gas, make the pores more uniformly dispersed, improve the sintering density, and thus improve the bending strength.

[0017] This application also controls the morphology of pores by using molding agents and lanthanum stearate, so that the mullite phase is interspersed in the corundum phase to form a network structure, which significantly improves the mechanical properties of the material; thus, an electrical porcelain material with excellent mechanical properties is obtained.

[0018] The raw materials also contain a certain amount of titanium. Titanium dioxide has a certain photocatalytic ability and can also improve the self-cleaning performance of electric ceramic materials.

[0019] The microstructure of electrical porcelain materials mainly includes corundum (Al2O3) and mullite (3Al2O3·2SiO2) phases; within a certain range, increasing the content of mullite phase is beneficial to enhancing the mechanical properties of electrical porcelain materials.

[0020] According to some embodiments of this application, the particle size of the yttrium oxide is 3 μm to 5 μm.

[0021] According to some embodiments of this application, the ceramic powder is a magnesium-calcium-silicon ternary ceramic powder;

[0022] According to some embodiments of this application, the mass fraction of magnesium oxide in the ceramic powder is 10% to 20%.

[0023] According to some embodiments of this application, the mass fraction of calcium oxide in the ceramic powder is 40% to 50%.

[0024] According to some embodiments of this application, the mass fraction of silicon oxide in the ceramic powder is 40% to 50%.

[0025] According to some embodiments of this application, the ceramic powder is 2CaO·MgO·2SiO2 powder.

[0026] According to some embodiments of this application, the preparation raw materials include the following parts by weight:

[0027] 100 parts alumina, 50-100 parts ceramic powder, 20-30 parts quartz, 5-10 parts titanium dioxide, 1-2 parts rare earth dopant, 10-20 parts dispersant and 5-10 parts forming agent.

[0028] According to some embodiments of this application, the molding agent comprises the following raw materials in parts by weight:

[0029] 10 parts modified aluminum silicate, 1 to 2 parts silicone rubber, 10 to 20 parts isopropyl trioleoyl oxytitanate and 1 to 2 parts isocyanate.

[0030] According to some embodiments of this application, the rare earth dopant comprises the following raw materials:

[0031] Yttrium trioxide, lanthanum stearate, and solvent;

[0032] According to some embodiments of this application, the rare earth dopant comprises the following raw materials in parts by weight:

[0033] 10 parts yttrium oxide, 20-40 parts lanthanum stearate, and 100-200 parts solvent;

[0034] According to some embodiments of this application, the solvent is ethanol.

[0035] According to some embodiments of this application, the silicone rubber includes methyl vinyl silicone rubber.

[0036] According to some embodiments of this application, the vinyl content of the methyl vinyl silicone rubber is 0.15% to 0.25%.

[0037] According to some embodiments of this application, the molecular weight of the methyl vinyl silicone rubber is 600,000 to 700,000.

[0038] According to some embodiments of this application, the vinyl silicone rubber is XIAMETER RBG-0702.

[0039] According to some embodiments of this application, the modified aluminum silicate comprises the following raw materials:

[0040] Vinyltrimethoxysilane, aluminum silicate, and base.

[0041] According to some embodiments of this application, the mass ratio of vinyltrimethoxysilane to aluminum silicate is 7-8:10.

[0042] The second aspect of this application provides a method for preparing rare earth-doped electrical porcelain according to the first aspect of this application, comprising the following steps:

[0043] The raw materials are mixed and then sintered.

[0044] The sintering temperature is 500℃~1300℃.

[0045] According to some embodiments of this application, the sintering includes a first heat preservation, a second heat preservation, and a third heat preservation.

[0046] According to some embodiments of this application, the temperature of the first heat preservation is 500℃~600℃.

[0047] According to some embodiments of this application, the first heat preservation time is 1 hour to 3 hours.

[0048] According to some embodiments of this application, the temperature of the second heat preservation is 1000℃~1100℃.

[0049] According to some embodiments of this application, the second heat preservation time is 12h to 16h.

[0050] According to some embodiments of this application, the temperature of the third heat preservation is 1200℃~1300℃.

[0051] According to some embodiments of this application, the third heat preservation time is 3h to 5h.

[0052] This application controls the heat preservation stage of sintering. The first heat preservation process mainly aims to fully decompose the organic matter in the raw materials. Organic matter containing metal elements will be transformed into inorganic matter, such as metal oxides, during the first heat preservation process. Organic matter containing metal elements has good compatibility with silicone rubber, which can fully fix the metal oxides in the electric porcelain material, thereby improving the uniformity of the phase after sintering. At the same time, the metal oxides can also be fully mixed with raw materials such as alumina, thereby fully forming a network structure in which the mullite phase is interspersed in the corundum phase, further improving the mechanical properties.

[0053] The second and third insulation processes mainly promote the formation of the mullite phase and increase its content, thereby improving the mechanical properties of the electrical porcelain material.

[0054] According to some embodiments of this application, the method for preparing the modified aluminum silicate includes the following steps:

[0055] Pretreated aluminum silicate is prepared by mixing aluminum silicate, alkali and water.

[0056] The pretreated aluminum silicate, vinyltrimethoxysilane and ethanol were mixed and refluxed.

[0057] According to some embodiments of this application, the reflux temperature is 60°C to 70°C.

[0058] According to some embodiments of this application, the reflux time is 5h to 6h.

[0059] The third aspect of this application provides the application of the rare earth-doped electrical porcelain described in the first aspect of this application in the preparation of insulators. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the following description and illustration are provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0061] Obviously, the following description is merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios without any inventive effort. Furthermore, it is understood that although the effort involved in such development may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0062] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structure may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the following description is provided to enable those skilled in the art to fully understand this application and is not intended to limit the subject matter of the claims.

[0063] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0064] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0065] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0066] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0067] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0068] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0069] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0070] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0071] Ceramic powder: 2CaO·MgO·2SiO2 powder, with a particle size (D50) of 5μm.

[0072] Silicone rubber: Vinyl silicone rubber is XIAMETER RBG-0702, with a vinyl content of 0.2% and a molecular weight of 600,000 to 700,000.

[0073] The particle size (D50) of yttrium oxide (YTO) is 4 μm.

[0074] Isocyanate: 1,3,5-tris(trimethoxysilylpropyl)polyisocyanate, Evonik Isocyanurate 88445.

[0075] The particle size (D50) of alumina is 5 μm.

[0076] The quartz grain size (D50) is 3 μm.

[0077] The particle size (D50) of titanium dioxide is 200 nm.

[0078] The particle size (D50) of aluminum silicate is 10 μm.

[0079] Example 1

[0080] This embodiment is a rare earth-doped electrical porcelain, composed of the following raw materials in parts by weight:

[0081] 100 parts alumina, 60 parts ceramic powder, 25 parts quartz, 5 parts titanium dioxide, 1.5 parts rare earth dopant, 20 parts dispersant (water) and 8 parts forming agent.

[0082] The molding agent consists of the following raw materials in parts by weight:

[0083] 10 parts modified aluminum silicate, 2 parts silicone rubber, 18 parts isopropyl trioleoyl oxytitanate and 2 parts isocyanate.

[0084] The rare earth dopant comprises the following raw materials in parts by weight:

[0085] 10 parts yttrium oxide, 30 parts lanthanum stearate, and 100 parts solvent (ethanol);

[0086] The preparation method of rare earth dopant consists of the following steps:

[0087] Yttrium oxide, lanthanum stearate and solvent were mixed and stirred (200 rpm), and then evaporated to dryness at 40°C.

[0088] Modified aluminum silicate includes the following raw materials:

[0089] Vinyltrimethoxysilane, aluminum silicate, and base (sodium carbonate).

[0090] The mass ratio of vinyltrimethoxysilane to aluminum silicate is 7.8:10.

[0091] The preparation method of modified aluminum silicate consists of the following steps:

[0092] Aluminum silicate, alkali (sodium carbonate, with a mass ratio of sodium carbonate to aluminum silicate of 1:1) and water (with a mass ratio of aluminum silicate to water of 1:10) were mixed (treated at 25°C for 2 hours), and the solid and liquid phases were separated to obtain pretreated aluminum silicate.

[0093] Pretreated aluminum silicate, vinyltrimethoxysilane and ethanol (the mass ratio of vinyltrimethoxysilane to ethanol is 1:10) are mixed and refluxed. After reflux, solid-liquid separation is performed and the solid phase is collected.

[0094] The reflux temperature was 65℃; the reflux time was 5 hours.

[0095] The method for preparing rare earth-doped electrical porcelain in this embodiment consists of the following steps:

[0096] The first powder is prepared by spray drying after mixing alumina, ceramic powder, quartz, titanium dioxide, rare earth dopants and dispersants.

[0097] The first powder and molding agent are mixed and then pressed (pressing pressure is 1.2 t / cm). 2 ), to obtain the blank;

[0098] Sinter the blank;

[0099] Sintering includes a first heating, a first holding, a second heating, a second holding, a third heating, and a third holding.

[0100] The initial temperature for the first heating cycle is 25℃, and the rate is 60℃ / h.

[0101] The temperature for the first heat preservation was 550℃, and the heat preservation time was 2 hours.

[0102] The second heating rate is 120℃ / h;

[0103] The second heat treatment was carried out at a temperature of 1050℃ for 12 hours.

[0104] The third heating rate is 20℃ / h;

[0105] The third heat treatment was carried out at a temperature of 1250℃ for 4 hours.

[0106] Example 2

[0107] This embodiment is a rare earth-doped electrical porcelain, composed of the following raw materials in parts by weight:

[0108] 100 parts alumina, 70 parts ceramic powder, 27 parts quartz, 10 parts titanium dioxide, 1.5 parts rare earth dopant, 20 parts dispersant (water) and 7 parts forming agent.

[0109] The molding agent consists of the following raw materials in parts by weight:

[0110] 10 parts modified aluminum silicate, 1.8 parts silicone rubber, 12 parts isopropyltrioleoyl oxytitanate and 1.8 parts isocyanate.

[0111] The rare earth dopant comprises the following raw materials in parts by weight:

[0112] 10 parts of yttrium trioxide, 12 parts of lanthanum stearate, and 100 parts of solvent (ethanol).

[0113] The preparation method of the rare earth dopant is as described in Example 1.

[0114] Modified aluminum silicate includes the following raw materials:

[0115] Vinyltrimethoxysilane, aluminum silicate, and base (sodium carbonate).

[0116] The mass ratio of vinyltrimethoxysilane to aluminum silicate is 7:10.

[0117] The mass ratio of sodium carbonate to aluminum silicate is 1:1.

[0118] The preparation method of modified aluminum silicate is as described in Example 1.

[0119] The preparation method of rare earth-doped electrical porcelain in this application is carried out with reference to Example 1.

[0120] Example 3

[0121] This embodiment is a rare earth-doped electrical porcelain, composed of the following raw materials in parts by weight:

[0122] 100 parts alumina, 50 parts ceramic powder, 30 parts quartz, 8 parts titanium dioxide, 1 part rare earth dopant, 20 parts dispersant (water) and 5 parts forming agent.

[0123] The molding agent consists of the following raw materials in parts by weight:

[0124] 10 parts modified aluminum silicate, 1 part silicone rubber, 20 parts isopropyl trioleoyl oxytitanate and 1 part isocyanate.

[0125] The rare earth dopant comprises the following raw materials in parts by weight:

[0126] 10 parts yttrium oxide, 40 parts lanthanum stearate, and 100 parts solvent (ethanol);

[0127] The preparation method of the rare earth dopant is as described in Example 1.

[0128] Modified aluminum silicate includes the following raw materials:

[0129] Vinyltrimethoxysilane, aluminum silicate, and base (sodium carbonate).

[0130] The mass ratio of vinyltrimethoxysilane to aluminum silicate is 8:10.

[0131] The mass ratio of sodium carbonate to aluminum silicate is 1:1;

[0132] The preparation method of modified aluminum silicate is as described in Example 1.

[0133] The preparation method of rare earth-doped electrical porcelain in this application is carried out with reference to Example 1.

[0134] Example 4

[0135] This embodiment is a rare earth-doped electrical porcelain, composed of the following raw materials in parts by weight:

[0136] 100 parts alumina, 100 parts ceramic powder, 20 parts quartz, 5 parts titanium dioxide, 2 parts rare earth dopant, 20 parts dispersant (water) and 10 parts forming agent.

[0137] The molding agent consists of the following raw materials in parts by weight:

[0138] 10 parts modified aluminum silicate, 2 parts silicone rubber, 10 parts isopropyl trioleoyl oxytitanate and 2 parts isocyanate.

[0139] The rare earth dopant comprises the following raw materials in parts by weight:

[0140] 10 parts yttrium oxide, 20 parts lanthanum stearate, and 100 parts solvent (ethanol);

[0141] Modified aluminum silicate includes the following raw materials:

[0142] Vinyltrimethoxysilane, aluminum silicate, and base (sodium carbonate).

[0143] The mass ratio of vinyltrimethoxysilane to aluminum silicate is 7:10.

[0144] The mass ratio of sodium carbonate to aluminum silicate is 1:1.

[0145] The preparation method of modified aluminum silicate is as described in Example 1.

[0146] The reflux temperature was 65℃; the reflux time was 5 hours.

[0147] The preparation method of rare earth-doped electrical porcelain in this application is carried out with reference to Example 1.

[0148] Example 5

[0149] This embodiment is a rare earth-doped electrical porcelain, which differs from Embodiment 4 in that: the preparation method of the rare earth-doped electrical porcelain in this embodiment consists of the following steps:

[0150] The first powder is prepared by spray drying after mixing alumina, ceramic powder, quartz, titanium dioxide, rare earth dopants and dispersants.

[0151] The first powder and molding agent are mixed and then pressed (pressing pressure is 1.2 t / cm). 2 ), to obtain the blank;

[0152] Sinter the blank;

[0153] Sintering consists of heating and holding.

[0154] The initial heating temperature is 25℃, and the rate of heating is 80℃ / h; the holding temperature is 1250℃, and the holding time is 16h.

[0155] Comparative Example 1

[0156] This comparative example is an electrical porcelain, and its differences from Example 5 are as follows:

[0157] Electrical porcelain is composed of the following raw materials in parts by weight:

[0158] 100 parts alumina, 100 parts ceramic powder, 20 parts quartz, 5 parts titanium dioxide, 20 parts dispersant (water) and 10 parts molding agent.

[0159] The preparation method of rare earth-doped electrical porcelain in this comparative example consists of the following steps:

[0160] The first powder is prepared by spray drying after mixing alumina, ceramic powder, quartz, titanium dioxide and dispersant.

[0161] The first powder and molding agent are mixed and then pressed (pressing pressure is 1.2 t / cm). 2 ), to obtain the blank;

[0162] Sinter the blank;

[0163] Sintering consists of heating and holding.

[0164] The initial heating temperature is 25℃, and the rate of heating is 80℃ / h; the holding temperature is 1250℃, and the holding time is 16h.

[0165] Comparative Example 2

[0166] This comparative example is an electrical porcelain, and its differences from Example 5 are as follows:

[0167] In this comparative example, the aluminum silicate was not modified.

[0168] The molding agent is composed of the following raw materials in parts by weight:

[0169] 10 parts aluminum silicate, 2 parts silicone rubber, 18 parts isopropyl trioleoyl oxytitanate and 2 parts isocyanate.

[0170] Comparative Example 3

[0171] This comparative example is an electrical porcelain, and its differences from Comparative Example 2 are as follows:

[0172] In this comparative example, isopropyltrioleoyl titanate was not added as a molding agent.

[0173] The molding agent is composed of the following raw materials in parts by weight:

[0174] 10 parts aluminum silicate, 2 parts silicone rubber and 2 parts isocyanate.

[0175] Comparative Example 4

[0176] This comparative example is an electrical porcelain, and its differences from Example 5 are as follows:

[0177] The rare earth dopant comprises the following raw materials in parts by weight:

[0178] Lanthanum stearate 30 parts and solvent (ethanol) 100 parts;

[0179] The preparation method of rare earth dopant consists of the following steps:

[0180] Lanthanum stearate and solvent were mixed and stirred (200 rpm), then evaporated to dryness at 40°C.

[0181] Comparative Example 5

[0182] This comparative example is an electrical porcelain, and its differences from Example 5 are as follows:

[0183] The rare earth dopant in this comparative example includes the following raw materials in parts by weight:

[0184] 10 parts yttrium oxide, 3.3 parts lanthanum oxide, and 100 parts solvent (ethanol).

[0185] The preparation method of rare earth dopant consists of the following steps:

[0186] Yttrium oxide, lanthanum oxide and solvent were mixed and stirred (200 rpm) and then evaporated to dryness at 40°C.

[0187] The performance test results of the electrical porcelain material in this application are shown in Table 1.

[0188] Table 1

[0189]

[0190]

[0191] The difference between Example 5 and Example 4 is that Example 5 involves a single heat preservation treatment. During the heating process, the organic matter cannot be fully decomposed. As a result, the residual organic matter will have a certain impact on the network structure during the formation of the mullite phase and corundum phase, leading to poor mechanical properties.

[0192] The difference between Comparative Example 1 and Example 5 is that there is no rare earth doping modifier in Comparative Example 1, and the content of mullite phase is greatly reduced, resulting in poor mechanical properties.

[0193] The difference between Comparative Example 2 and Example 5 is that aluminum silicate is not modified. Aluminum silicate plays a bonding role in the blank forming process. However, it is not modified with silane, which has poor compatibility with silicone rubber. The resulting bonding network has poor stability, which leads to poor mechanical properties of the final electrical porcelain material.

[0194] The difference between Comparative Example 3 and Comparative Example 2 is that isopropyltrioleyloxytitanate was not added. Isopropyltrioleyloxytitanate contains organic segments, which is beneficial to improving compatibility. Without this substance, the stability of the adhesive network is further deteriorated, resulting in poor mechanical properties of the final electrical porcelain material.

[0195] The difference between Comparative Example 4 and Example 5 is that yttrium oxide was not added to the rare earth dopant, which greatly reduced the content of the mullite phase, resulting in poor mechanical properties.

[0196] The difference between Comparative Example 5 and Example 5 is that lanthanum stearate was replaced with lanthanum oxide. Lanthanum stearate has good compatibility with silicone rubber and modified aluminum silicate; while lanthanum oxide has poor compatibility, which makes it more difficult to form the interpenetrating network structure between the mullite phase and the corundum phase, resulting in poor mechanical properties.

[0197] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A rare earth doped electric porcelain, characterized by, The preparation raw materials include: alumina, ceramic powder, quartz, titanium white powder, rare earth dopant, dispersant and forming agent; The forming agent includes the following preparation raw materials: modified aluminum silicate, silicone rubber, isopropyl triolein acyl oxygen base titanium acid ester and isocyanate; The rare earth dopant includes the following preparation raw materials: yttrium trioxide and lanthanum stearate; The modified aluminum silicate includes the following preparation raw materials: vinyl trimethoxysilane, aluminum silicate and alkali; The mass ratio of the vinyl trimethoxysilane and aluminum silicate is 7-8:

10.

2. The rare earth doped electric porcelain according to claim 1, wherein, The ceramic powder is magnesium-calcium-silicon ternary ceramic powder; And / or, the mass fraction of magnesium oxide in the ceramic powder is 10%-20%; And / or, the mass fraction of calcium oxide in the ceramic powder is 40%-50%; And / or, the mass fraction of silicon oxide in the ceramic powder is 40%-50%.

3. The rare earth doped electric porcelain of claim 1, wherein, The preparation raw materials include the following weight fractions: alumina 100 parts, ceramic powder 50-100 parts, quartz 20-30 parts, titanium white powder 5-10 parts, rare earth dopant 1-2 parts, dispersant 10-20 parts and forming agent 5-10 parts; And / or, the forming agent includes the following preparation raw materials: modified aluminum silicate 10 parts, silicone rubber 1-2 parts, isopropyl triolein acyl oxygen base titanium acid ester 10-20 parts and isocyanate 1-2 parts; And / or, the rare earth dopant includes the following preparation raw materials: yttrium trioxide, lanthanum stearate and solvent; And / or, the rare earth dopant includes the following preparation raw materials: yttrium trioxide 10 parts, lanthanum stearate 20-40 parts and solvent 100-200 parts; And / or, the solvent is ethanol.

4. The rare earth doped electric porcelain of claim 1, wherein, The silicone rubber includes methyl vinyl silicone rubber; And / or, the vinyl content of the methyl vinyl silicone rubber is 0.15%-0.25%; And / or, the molecular weight of the methyl vinyl silicone rubber is 600-700 thousand; And / or, the vinyl silicone rubber is XIAMETER RBG-0702.

5. The method of producing a rare earth-doped electric porcelain according to any one of claims 1 to 4, characterized by, The steps include: mixing the preparation raw materials and sintering; The sintering temperature is 500-1300℃.

6. The production method according to claim 5, wherein The sintering includes first holding, second holding and third holding; And / or, the first holding temperature is 500-600℃; And / or, the first holding time is 1-3h; And / or, the second holding temperature is 1000-1100℃; And / or, the second holding time is 12-16h; And / or, the third holding temperature is 1200-1300℃; And / or, the third holding time is 3-5h.

7. The preparation method according to claim 5, characterized in that, The preparation method of the modified aluminum silicate includes the following steps: mixing aluminum silicate, alkali and water to obtain pretreated aluminum silicate; mixing the pretreated aluminum silicate, vinyl trimethoxysilane and ethanol and refluxing.

8. The production method according to claim 7, characterized by, The refluxing temperature is 60-70℃; And / or, the refluxing time is 5-6h.

9. Use of the rare earth doped electric porcelain according to any one of claims 1-4 in the preparation of an insulator.

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