A composite quartz sagger and its preparation method and application

Abstract

The present invention discloses a composite quartz sagger and its preparation method and application, which belongs to the technical field of saggers. The thermal expansion coefficient of the sagger is ≤2.0×10 ‑6 / °C, the composite quartz sagger does not crack when water-cooled at a temperature of 1100°C, and the operating temperature of the sagger is ≤1300°C; the sagger uses a first fused quartz and a second fused quartz as aggregates; the particle size of the first fused quartz is 0.1-0.9mm, and the particle size of the second fused quartz is 1-2mm; the first fused quartz accounts for 18-40% of the raw materials used in the sagger preparation; and the second fused quartz accounts for 18-40% of the raw materials used in the sagger preparation. The sagger, its preparation method, and application are characterized by a small thermal expansion coefficient, high dimensional accuracy of the finished product, no deformation at high temperatures, good water-cooled thermal shock stability, and good chemical corrosion resistance. It can be used in various non-alkaline environments and high-temperature calcination environments with rapid temperature rise and fall.

Description

Technical Field

[0001] The present invention relates to the technical field of saggers, and in particular to a composite quartz sagger, a preparation method thereof and an application thereof. Background Art

[0002] With the rapid development of the new energy industry, the performance requirements for battery materials are increasing. The sagger used in the sintering process of cathode materials, a key component of batteries, has a significant impact on the material's performance. While traditional sagger materials, such as cordierite-mullite / spinel composites, can meet general requirements, they lack water-cooling stability and corrosion resistance. Therefore, the development of new sagger materials and their preparation methods is of great significance.

[0003] Quartz ceramics are also known as fused quartz ceramics, quartz glass ceramics, and quartz glass sintered products. Traditional fused quartz ceramic products are a combination of amorphous silicon dioxide produced using a special production process.

[0004] Fused quartz ceramics are made from fused quartz with high purity (SiO2% > 99%). Their greatest advantage is that their strength increases with temperature below 1100°C, increasing from room temperature to 1100°C, and they remain functional below 1300°C. Due to their low thermal conductivity, small coefficient of expansion, high-temperature resistance, excellent thermal stability, and corrosion resistance, they are widely used in metallurgy, building materials, chemicals, national defense, and scientific research. In particular, the solar polysilicon industry often uses fused quartz as a raw material for ceramic crucibles. Summary of the Invention

[0005] The object of the present invention is to overcome the shortcomings of the prior art and provide a composite quartz sagger and its preparation method and application. The sagger has the characteristics of small thermal expansion coefficient, high dimensional accuracy of the finished product, no deformation at high temperature, good water-cooled thermal shock stability, and good chemical corrosion resistance. It can be applied to various non-alkaline environments and high-temperature calcination environments with rapid temperature increase and decrease.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A composite quartz sagger, wherein the thermal expansion coefficient of the sagger is ≤2.0×10 -6 / ℃, the sagger does not crack when water-cooled at a temperature of 1100℃, and the operating temperature of the sagger is ≤1300℃;

[0008] The sagger uses first fused quartz and second fused quartz as aggregates; the particle size of the first fused quartz is 0.1-0.9 mm, and the particle size of the second fused quartz is 1-2 mm; the first fused quartz accounts for 18-40% of the raw materials for preparing the sagger; the second fused quartz accounts for 18-40% of the raw materials for preparing the sagger.

[0009] As a preferred embodiment of the present invention, the sagger includes the following raw materials in parts by weight: 20 to 40 parts of a first fused quartz, 20 to 40 parts of a second fused quartz, 0 to 20 parts of a roller stock, 0 to 20 parts of an M70 sintered mullite, 10 to 20 parts of kaolin, 0 to 20 parts of α-alumina, 0 to 40 parts of cordierite, 0 to 20 parts of andalusite, 1 to 5 parts of a binder, and 1 to 5 parts of water.

[0010] Wherein, the α-alumina is a corundum phase of more than 90%.

[0011] Cordierite is cordierite phase>90%; 200-325 mesh, 0.2-1.25mm particles, 1-2mm particles.

[0012] The roller rod material has an aluminum oxide content greater than 70%, a zirconium oxide content of 1-10%, 200-325 meshes, 0-1mm particles and 1-2mm particles.

[0013] It should be noted that the roller rod material is an alumina roller rod, which is a roller rod obtained by crushing unqualified products from a kiln or dismantled from a scrapped kiln and is conventionally available on the market.

[0014] As a preferred embodiment of the present invention, the sagger includes the following raw materials in parts by weight: 20 to 40 parts of a first fused quartz, 20 to 40 parts of a second fused quartz, 5 to 10 parts of M70 sintered mullite, 15 to 18 parts of kaolin, 13 to 15 parts of α-alumina, 0 to 5 parts of andalusite, 1.5 to 2 parts of a binder, and 2 to 3 parts of water.

[0015] As a preferred embodiment of the present invention, the particle size of the M70 sintered mullite is 300-350 meshes.

[0016] As a preferred embodiment of the present invention, the particle size of the andalusite is 0.1 to 1 mm.

[0017] As a preferred embodiment of the present invention, the binder is at least one of sodium lignin sulfonate, calcium lignin sulfonate, peach gum, yellow dextrin, white dextrin, polyvinyl alcohol, polyethylene glycol, 801 glue powder, carboxymethyl cellulose, and hydroxypropyl methylcellulose.

[0018] The present invention also provides a method for preparing a composite quartz sagger, comprising the following steps:

[0019] (1) mixing water and a binder uniformly to obtain a mixture;

[0020] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0021] (3) mixing the remaining materials uniformly to obtain a base material;

[0022] (4) The aggregate and base material are mixed evenly, aged, and the aged material is filled into a mold, pressed, and sintered to obtain a sagger.

[0023] As a preferred embodiment of the present invention, the pressing adopts a four-column bidirectional hydraulic press, the pressing pressure is 90-120 MPa, the ejection pressure is 60-80 MPa, and the pressing time is 2-10 minutes.

[0024] As a preferred embodiment of the present invention, the sintering is specifically as follows: first, the temperature is increased to 450-500°C at a heating rate of 1-3°C / min, then the temperature is increased to 950-1000°C at a heating rate of 3-5°C / min, then the temperature is increased to 1320-1400°C at a heating rate of 1-3°C / min, kept warm for 3-5h, cooled to 900-950°C at a cooling rate of 1-3°C / min, then cooled to 550-600°C at a cooling rate of 3-5°C / min, and finally naturally cooled to room temperature.

[0025] The present invention also provides an application of a composite quartz sagger in preparing positive electrode materials.

[0026] The beneficial effects of the present invention are as follows: the present invention uses the first fused quartz and the second fused quartz as aggregates, controls the particle size and ratio of the two, adds roller rod material, M70 sintered mullite, kaolin, α-alumina, cordierite, and andalusite, and forms a sagger through premixing, mixing, aging, hydraulic forming, drying, and high-temperature firing. The method has a simple manufacturing process, is environmentally friendly, does not generate any wastewater, has a low manufacturing cost, and is convenient for industrial and automated production. Because it has the characteristics of a small thermal expansion coefficient, high dimensional accuracy of the finished product, no deformation at high temperature, good water-cooled thermal shock stability, and good chemical corrosion resistance, it can be applied to various non-alkaline environments and high-temperature calcination environments with rapid temperature increase and decrease. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the flow chart of water-cooled thermal shock test. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0030] In this application, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0031] In the present application, there is no particular limitation on the specific dispersion and stirring treatment methods.

[0032] Unless otherwise specified, the components, raw materials or instruments used in the embodiments and comparative examples of the present invention are all commercially available raw materials or instruments, and the components and raw materials used in each parallel experiment are all of the same kind.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] The following examples are provided to facilitate understanding of the present invention. These examples are not provided to limit the scope of the claims.

[0035] Example 1

[0036] A composite quartz sagger comprises the following raw materials in parts by weight: 40 parts of a first fused quartz, 20 parts of a second fused quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2.5 parts of yellow dextrin, and 4 parts of water.

[0037] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0038] The particle size of the M70 sintered mullite is 325 mesh.

[0039] The preparation method of the composite quartz sagger comprises the following steps:

[0040] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0041] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0042] (3) mixing the remaining materials uniformly to obtain a base material;

[0043] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0044] Example 2

[0045] A composite quartz sagger comprises the following raw materials in parts by weight: 20 parts of a first fused quartz, 40 parts of a second fused quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water.

[0046] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0047] The particle size of the M70 sintered mullite is 325 mesh.

[0048] The preparation method of the composite quartz sagger comprises the following steps:

[0049] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0050] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0051] (3) mixing the remaining materials uniformly to obtain a base material;

[0052] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0053] Example 3

[0054] A composite quartz sagger comprises the following raw materials in parts by weight: 20 parts of a first fused quartz, 40 parts of a second fused quartz, 5 parts of andalusite, 5 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 1.5 parts of yellow dextrin, and 2.5 parts of water.

[0055] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0056] The particle size of the M70 sintered mullite is 325 mesh.

[0057] The particle size of the andalusite is 0.1-1 mm.

[0058] The preparation method of the composite quartz sagger comprises the following steps:

[0059] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0060] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0061] (3) mixing the remaining materials uniformly to obtain a base material;

[0062] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0063] Example 4

[0064] A composite quartz sagger comprises the following raw materials in parts by weight: 35 parts of first fused quartz, 25 parts of second fused quartz, 10 parts of roller stock, 16 parts of kaolin, 14 parts of α-alumina, 1.5 parts of yellow dextrin, and 2.5 parts of water.

[0065] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0066] The roller bar stock includes a first roller bar stock and a second roller bar stock; the particle size of the first roller bar stock is 0.1-1 mm, the particle size of the second roller bar stock is 325 mesh, and the mass ratio of the first roller bar stock to the second roller bar stock is 1:1.

[0067] The preparation method of the composite quartz sagger comprises the following steps:

[0068] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0069] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0070] (3) mixing the remaining materials uniformly to obtain a base material;

[0071] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0072] Example 5

[0073] A composite quartz sagger comprises the following raw materials in parts by weight: 30 parts of first fused quartz, 20 parts of second fused quartz, 34 parts of cordierite, 16 parts of kaolin, 2 parts of yellow dextrin, and 2.5 parts of water.

[0074] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0075] The cordierite includes a first cordierite, a second cordierite, and a third cordierite, and the mass ratio of the first cordierite, the second cordierite, and the third cordierite is 5:11:18; the particle size of the first cordierite is 1-2 mm, the particle size of the first cordierite is 1.25-0.2 mesh, and the particle size of the third cordierite is 325 mesh.

[0076] The preparation method of the composite quartz sagger comprises the following steps:

[0077] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0078] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0079] (3) mixing the remaining materials uniformly to obtain a base material;

[0080] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0081] Comparative Example 1

[0082] The difference between Comparative Example 1 and Example 1 is that quartz is used instead of fused quartz in Comparative Example 1, and all other aspects are the same.

[0083] A composite quartz sagger comprises the following raw materials in parts by weight: 20 parts of first quartz, 40 parts of second quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water.

[0084] The particle size of the first quartz is 0.1-0.9 mm, and the particle size of the second quartz is 1-2 mm.

[0085] The particle size of the M70 sintered mullite is 325 mesh.

[0086] The preparation method of the composite quartz sagger comprises the following steps:

[0087] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0088] (2) uniformly mixing the first quartz and the second quartz to obtain mixed quartz, and uniformly mixing the mixed quartz with the mixture to obtain aggregate;

[0089] (3) mixing the remaining materials uniformly to obtain a base material;

[0090] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0091] Comparative Example 2

[0092] A composite quartz sagger comprises the following raw materials in parts by weight: 60 parts of first fused quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water.

[0093] The particle size of the first fused quartz is 0.1-0.9 mm.

[0094] The particle size of the M70 sintered mullite is 325 mesh.

[0095] The preparation method of the composite quartz sagger comprises the following steps:

[0096] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0097] (2) uniformly mixing the first fused quartz with the mixture to obtain aggregate;

[0098] (3) mixing the remaining materials uniformly to obtain a base material;

[0099] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0100] Comparative Example 3

[0101] A composite quartz sagger comprises the following raw materials in parts by weight: 60 parts of second fused quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water.

[0102] The particle size of the secondary fused quartz is 1-2 mm.

[0103] The particle size of the M70 sintered mullite is 325 mesh.

[0104] The preparation method of the composite quartz sagger comprises the following steps:

[0105] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0106] (2) uniformly mixing the second fused quartz with the mixture to obtain aggregate;

[0107] (3) mixing the remaining materials uniformly to obtain a base material;

[0108] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0109] Comparative Example 4

[0110] A composite quartz sagger comprises the following raw materials in parts by weight: 10 parts of a first fused quartz, 20 parts of a second fused quartz, 20 parts of M70 sintered mullite, 26 parts of kaolin, 24 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water.

[0111] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0112] The particle size of the M70 sintered mullite is 325 mesh.

[0113] The preparation method of the composite quartz sagger comprises the following steps:

[0114] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0115] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0116] (3) mixing the remaining materials uniformly to obtain a base material;

[0117] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 2 °C / min, then increased to 1000 °C at a heating rate of 4 °C / min, and then increased to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 2 °C / min, and then decreased to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0118] Comparative Example 5

[0119] A composite quartz sagger comprises the following raw materials in parts by weight: 20 parts of a first fused quartz, 40 parts of a second fused quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water.

[0120] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0121] The particle size of the M70 sintered mullite is 325 mesh.

[0122] The preparation method of the composite quartz sagger comprises the following steps:

[0123] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0124] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0125] (3) mixing the remaining materials uniformly to obtain a base material;

[0126] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press with a pressing pressure of 100 MPa and an ejection pressure of 70 MPa. The material was heated to 1380 °C at a heating rate of 2 °C / min, kept warm for 4 h, and naturally cooled to room temperature to obtain a sagger.

[0127] Comparative Example 6

[0128] A composite quartz sagger comprises the following raw materials in parts by weight: 20 parts of a first fused quartz, 40 parts of a second fused quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water.

[0129] The particle size of the first fused quartz is 0.1 to 0.9 mm, and the particle size of the second fused quartz is 1 to 2 mm.

[0130] The particle size of the M70 sintered mullite is 325 mesh.

[0131] The preparation method of the composite quartz sagger comprises the following steps:

[0132] (1) mixing water and yellow dextrin uniformly to obtain a mixture;

[0133] (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate;

[0134] (3) mixing the remaining materials uniformly to obtain a base material;

[0135] (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into a mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first increased to 480 °C at a heating rate of 5 °C / min, then increased to 1000 °C at a heating rate of 5 °C / min, and then increased to 1380 °C at a heating rate of 5 °C / min. The temperature was kept at this temperature for 4 h, and then decreased to 900 °C at a cooling rate of 5 °C / min, and then decreased to 600 °C at a cooling rate of 5 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

[0136] Test Case

[0137] Among them, the performance of composite quartz sagger is shown in Table 1.

[0138] The water-cooled thermal shock test process is as follows: Figure 1 shown.

[0139] Table 1

[0140]

[0141] As can be seen from Table 1, the composite quartz sagger described in the present invention has the characteristics of small thermal expansion coefficient, high dimensional accuracy of the finished product, no deformation at high temperature, good water-cooled thermal shock stability, and good chemical corrosion resistance. It can be applied to various non-alkaline environments and high-temperature calcination environments with rapid temperature increase and decrease.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A composite quartz sagger, characterized in that: The sagger is prepared from the following raw materials in parts by weight: 20 parts of first fused quartz, 40 parts of second fused quartz, 10 parts of M70 sintered mullite, 16 parts of kaolin, 14 parts of α-alumina, 2 parts of yellow dextrin, and 2.5 parts of water; The sagger uses first fused quartz and second fused quartz as aggregates; the particle size of the first fused quartz is 0.1-0.9 mm, and the particle size of the second fused quartz is 1-2 mm; The particle size of the M70 sintered mullite is 325 mesh; The preparation method of the composite quartz sagger comprises the following steps: (1) Mixing water and yellow dextrin uniformly to obtain a mixture; (2) uniformly mixing the first fused quartz and the second fused quartz to obtain mixed fused quartz, and uniformly mixing the mixed fused quartz with the mixture to obtain aggregate; (3) Mix the remaining materials evenly to obtain the base material; (4) The aggregate and base material were mixed evenly and aged for 24 h. The aged material was filled into the mold and pressed for 5 min using a 1500-ton four-column bidirectional hydraulic press. The pressing pressure was 100 MPa and the ejection pressure was 70 MPa. The temperature was first raised to 480 °C at a heating rate of 2 °C / min, then raised to 1000 °C at a heating rate of 4 °C / min, and then raised to 1380 °C at a heating rate of 2 °C / min. The temperature was kept at this temperature for 4 h, then lowered to 900 °C at a cooling rate of 2 °C / min, and then lowered to 600 °C at a cooling rate of 4 °C / min. Finally, the mold was naturally cooled to room temperature to obtain a sagger.

2. Use of the composite quartz sagger according to claim 1 in the preparation of positive electrode materials.

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