Zirconium oxide-zirconite composite material as well as preparation method and application thereof

Abstract

The invention discloses a zirconium oxide-zirconite composite material as well as a preparation method and application thereof, and relates to the technical field of refractory materials. According to the technical scheme, the high-strength wear-resistant coating is prepared from, by mass, 82%-88% of zirconite powder, 8%-14% of desiliconized zirconium powder, 1%-6% of zirconium pyrophosphate, 0.5%-1% of titanium dioxide and 1.5%-4.5% of an organic binding agent, and the total mass of other raw materials except for the organic binding agent is 100%; the organic binding agent comprises, by mass, 82%-88% of zirconite powder, 8%-14% of desiliconized zirconium powder, 1%-6% of zirconium pyrophosphate, 0.5%-1% of titanium dioxide and 1.5%-4.5% of the organic binding agent; zrO2 in the desilicication zirconium powder is greater than 98 wt.%, and the purity of zirconium pyrophosphate is greater than 99 wt.%. The apparent porosity of the zirconium oxide-zirconite composite material is smaller than 14%, the volume density is larger than or equal to 4.05 g / cm < 3 >, the normal-temperature compressive strength is 210-385 MPa, the 50-hour compressive creep rate at the temperature of 1300 DEG C and the pressure of 0.5 MPa is smaller than-0.01%, and the zirconium oxide-zirconite composite material has good machinability and can be used for supporting components of liquid crystal glass overflow bricks.

Description

Technical Field

[0001] The invention relates to the technical field of refractory materials, and in particular to a zirconium oxide-zircon composite material and a preparation method and application thereof. Background Art

[0002] Overflow bricks are key functional materials in the liquid crystal glass manufacturing system. Their support structure is mainly used to bear the weight of the overflow bricks, prevent them from deformation or collapse due to their own weight and external forces, and ensure the stability of the overflow bricks in the working state. At present, the support structure is divided into two parts, namely, a rigid overflow brick support frame and a flexible overflow brick support device. The rigid overflow brick support frame is mostly made of imported heat-resistant steel. The flexible overflow brick support device can be placed at the far and near ends of the overflow brick to support the overflow brick and fit with the lower surface of the far and near ends of the overflow brick. The fitting surface of the flexible overflow brick support device is processed into a wire groove by groove cutting. A heating wire is provided in the wire groove, which can heat the two ends of the overflow brick to avoid crystallization at the far and near ends. This requires the flexible overflow brick support device to have the characteristics of easy processing, high temperature resistance, and not easy to deform.

[0003] Chinese invention patent CN118684491A discloses a method for preparing low expansion and high thermal shock zirconium oxide products, which uses fused high-purity zirconium oxide particles with a particle size of 0-3mm as aggregate, adds MgO as a stabilizer, uses high-purity monoclinic zirconium oxide fine powder with a particle size of less than 45μm, zircon fine powder and high-purity zirconium oxide micropowder with a particle size of less than 2μm as a matrix, uses magnesium oxide, basic magnesium carbonate or magnesium hydroxide with a particle size of less than 45μm as an additive, uses water-based resin, phenolic resin or polyvinyl alcohol solution as a binder, and after mixing, molding and drying, it is fired at a temperature of 1650-1750℃. This patent adds large-particle aggregates, has low compressive strength, and has particles peeling off during grooving. In addition, the fired high-zirconium bricks are conductive at high temperatures and cannot be used to install heating wires.

[0004] Chinese invention patent CN108727019A discloses zircon bricks and their preparation method. The raw materials include 40-60% by mass of dense zircon clinker and 40-60% by mass of matrix material. The matrix material includes the following raw materials in mass percentage: 75-88% zircon sand, 10-20% zirconium dioxide, 1-3% titanium dioxide, 0.5-2% stabilizer, 0.1-0.8% binder; it is formed by cold isostatic pressing at 150-250MPa and fired at 1500-1630℃ for 6-20h. The products are suitable for contacting glass parts with high thermal stress or high glass quality requirements in alkali-free glass fiber melting furnaces. The patent also adds large aggregate particles, which have low compressive strength and are prone to particle peeling during grooving.

[0005] Chinese invention patent CN116986897A discloses a sintered high-zirconia brick and its preparation method, including raw materials in the following weight percentages: ZrO 2 76 - 88 wt.%; ZA eutectic 5 - 10 wt.%; Y 2 O 3 2 - 8 wt.%; MgO 2 - 6 wt.%; CaO 2 - 4 wt.%; CeO 2 0.4 - 1.2 wt.%; SrO 0.3 - 1 wt.%. This patent is applicable to the liquid surface line position of the glass melting tank, with low porosity, high bulk density, and good thermal shock stability. However, the main matrix is ZrO 2 or yttrium-stabilized zirconia, which has high strength and can conduct electricity at high temperatures, and cannot be used for installing heating wires in grooves.

[0006] Acta Silicate Sinica Vol.31 No.4 paper "Research on the Machining Mechanism of CePO 4 / Ce-ZrO 2 Processable Ceramics" Through comparing the indentation crack propagation morphology and grinding and cutting machining analysis of the material before and after adding CePO 4 It is found that the fracture form of larger CePO 4 / Ce-ZrO 2 particles is micro-laminated fracture; a weak bonding interface between CePO 4 and ZrO 4 particles forms discontinuous cracking. The existence of these two mechanisms enables a large number of thousand-layer microcracks to be formed during material processing or before failure to disperse the energy of crack propagation. The final removal of the material during processing is achieved by the connection of these microcracks, reducing processing damage while making the material exhibit processability. Using nanomaterials 12Ce-ZrO 2 (average particle size 0.06 μm), CePO 2 (average particle size 0.04 μm) as raw materials, proportioned by mass fraction (the same below) of 0, 15%, 25%, 50%, ball-milled, dried, dry-pressed, and isostatically pressed (200 MPa), and sintered at 1550 °C for 24 h in a silicon molybdenum rod electric furnace to obtain test pieces, achieving good machining properties. However, the melting point of CePO 4 is only 1255 °C and cannot be used for high-temperature support structures. 4 In view of the deficiencies of the existing technology, a new flexible overflow brick support device is needed to solve the problems of the existing materials having high hardness, high brittleness, low processing efficiency, and being prone to chipping and corner breakage resulting in waste products, as well as the problem of high creep rate affecting the service life.

[0007] Summary of the Invention Summary of the Invention

[0008] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art and provide a zirconia-zirconolite composite material, its preparation method and application, which have an apparent porosity < 14%, a bulk density ≥ 4.05 g / cm 3 , a cold crushing strength in the range of 210 - 385 MPa, a compressive creep rate of less than -0.01% under 0.5 MPa at 1300 °C for 50 h, and good workability, and can be used for the support components of overflow bricks for liquid crystal glass.

[0009] The technical solution of the present invention is as follows: In the first aspect, the present invention provides a zirconia-zirconolite composite material, including raw materials in the following mass percentages. The total mass of the remaining raw materials except the organic binder is counted as 100%, and the organic binder is counted as the percentage of the total mass of the remaining raw materials: zirconolite powder 82 - 88%, desilicated zircon powder 8 - 14%, zirconium pyrophosphate 1 - 6%, titanium dioxide 0.5 - 1%, organic binder 1.5 - 4.5%; in the desilicated zircon powder, ZrO 2 > 98 wt.%, and the purity of zirconium pyrophosphate > 99 wt.%.

[0010] Preferably, in the zirconolite powder, ZrO 2 > 65 wt.%, SiO 2 < 34 wt.%, Al 2 O 3 < 0.2 wt.%, Fe 2 O 3 < 0.1 wt.%, and the particle size < 320 mesh.

[0011] Preferably, the particle size of the desilicated zircon powder < 320 mesh.

[0012] Preferably, the median diameter D 50 of the zirconium pyrophosphate < 5 μm.

[0013] Preferably, in the titanium dioxide, TiO 2 > 98.5 wt.%, and the particle size < 320 mesh.

[0014] Preferably, the organic binder is a composition of phenolic resin, carboxymethyl cellulose and polyvinyl alcohol with a mass ratio of 1:1:1.

[0015] In the second aspect, the present invention provides a preparation method of the above zirconia-zirconolite composite material, including the following steps: S1 Wet ball milling: Add the organic binder to the ball milling equipment and add water for pre-grinding; then add zirconolite powder, desilicated zircon powder, zirconium pyrophosphate, and titanium dioxide to the ball milling equipment for grinding to obtain a slurry; S2 Granulation: Spray granulate the slurry, sieve the obtained granulated powder; S3 Molding: Load the granulated powder into a mold and perform isostatic pressing to obtain a green compact. S4 Sintering: Sinter the green compact at 1500 - 1600 °C for 12 - 36 h with a heating rate of 3 - 6 °C / h; when the temperature is cooled to 1000 °C after sintering, the cooling rate is 3 - 4 °C / h, and continue to cool with a cooling rate of 5 - 7 °C / h to obtain the zirconia-zirconolite composite material.

[0016] Preferably, in step S1, the median diameter D of the slurry 50 = 3 - 6 μm.

[0017] Preferably, in step S3, the isostatic pressing pressure is 120 - 200 MPa.

[0018] In a third aspect, the present invention provides the application of the above zirconia-zirconolite composite material. The zirconia-zirconolite composite material is processed into an overflow brick support brick by grooving: Use a cutting and grinding tool to process the zirconia-zirconolite composite material into a cube, and then process a number of parallel grooves on the four side faces of the cube to obtain the overflow brick support brick.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The zirconia-zirconolite composite material of the present invention has the characteristics of apparent porosity < 14%, bulk density ≥ 4.05 g / cm 3 , cold crushing strength in the range of 210 - 385 MPa, creep rate under 1300 °C and 0.5 MPa for 50 h less than -0.01%, and has good machinability, and can be used as a support component for the overflow brick of liquid crystal glass.

[0020] 2. Compared with the existing zirconolite products, the zirconia-zirconolite composite material of the present invention will not have the phenomenon of edge chipping during grooving processing, and the qualified rate of the grooving processing of the product reaches 100%. The preparation method of the present invention is simple, feasible, scientific and reasonable, and is convenient for large-scale industrial production. Brief Description of the Drawings

[0021] Figure 1 is a schematic diagram of the overflow brick support brick with edge chipping phenomenon in the present invention. Detailed Embodiments

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0023] In the following examples and comparative examples, the zirconolite powder used includes the following components by mass percentage: 0.15 wt.% of Al 2 O 3 、0.06 wt.% of Fe2 O 3 and 32.95 wt.% of SiO 2 and 66.2 wt.% of ZrO 2 , the balance being K 2 O, Na 2 O, CaO, MgO and other trace impurities; the particle size of zircon sand powder is < 320 mesh. The used desilicated zircon powder comprises the following components in mass percentage: 0.25 wt.% of Al 2 O 3 , 0.3 wt.% of SiO 2 , 99.25 wt.% of ZrO 2 , the balance being TiO 2 , CaO, MgO and other trace impurities; the particle size of desilicated zircon powder is < 320 mesh. The purity of the used zirconium pyrophosphate powder is 99.4 wt.%, wherein the content of ZrO 2 is 50.3 wt.%, the content of P 2 O 5 is about 49.1 wt.%, and other impurity components are basically not contained, and the median diameter D 50 of the powder is 4 μm. In the used sintering promoter titanium dioxide powder, the content of TiO 2 is 99.1 wt.%, the particle size is < 320 mesh, and the crystal form is rutile type. The used yttrium-stabilized zirconia comprises the following components in mass percentage: 5.3 wt.% of Y 2 O 3 , 0.2 wt.% of Al 2 O 3 , 0.06 wt.% of Fe 2 O 3 , 94.4 wt.% of ZrO 2 , the balance being K 2 O, Na 2 O, CaO, MgO and other trace impurities; the particle size is < 320 mesh.

[0024] The preparation method of the zirconia-zircon sand composite material in the following examples comprises the following steps: S1 Wet ball milling: Weigh the organic binder and add it into the ball milling equipment, add water and pre-grind for 5 min; then weigh the zircon sand powder, desilicated zircon powder, zirconium pyrophosphate and titanium dioxide powder and add them into the ball milling equipment for grinding to obtain slurry; S2 Granulation: Spray granulate the slurry to obtain granulated powder with uniform components and particles, and use it after passing through a 100-mesh sieve; S3 Molding: Load the granulated powder into a mold, seal and evacuate the mold, and then put it into a cold isostatic pressing equipment to obtain a green body; S4 Sintering: Put the green body into a kiln and sinter it at 1500 - 1600 °C for 12 - 36 h, with a heating rate of 3 - 6 °C / h; when the temperature is cooled to 1000 °C after sintering, the cooling rate is 3 - 4 °C / h, and continue to cool, with a cooling rate of 5 - 7 °C / h, then the zirconia-zirconolite composite material is obtained.

[0025] Process the prepared zirconia-zirconolite composite material into an overflow brick support brick by grooving: Use a cutting and grinding tool to process the zirconia-zirconolite composite material into a cube with dimensions of 200 mm × 200 mm × 200 mm, and then use a CNC machining center to process a number of parallel grooves with a spacing of 4 mm on four sides of the cube. When grooving, use a diamond saw blade with a diameter of 150 mm and a thickness of 3 mm, control the rotational speed of the diamond saw blade at 1000 r / min, and control the feed speed of the cube at 0.35 m / s; use water as the grinding fluid to cool the diamond saw blade, and fix the grinding depth at 8 mm, then the overflow brick support brick is obtained.

[0026] The formulations and process parameters of the zirconia-zirconolite composite materials in Examples 1 - 9 and Comparative Examples 1 - 10 are shown in Tables 1 - 3: Table 1 Formulations and process parameters of the zirconia-zirconolite composite materials in Examples 1 - 9

[0027] Table 2 Formulations and process parameters of the zirconia-zirconolite composite materials in Comparative Examples 1 - 5

[0028] Table 3 Formulations and process parameters of the zirconia-zirconolite composite materials in Comparative Examples 6 - 10

[0029] Conduct performance tests on the overflow brick support bricks processed in Examples 1 - 9 and Comparative Examples 1 - 10. Among them, the apparent porosity and bulk density are tested in accordance with "GB / T 2997 - 2015 Test methods for bulk density, apparent porosity and true porosity of dense shaped refractory products"; the cold crushing strength is tested in accordance with "GB / T 5072 - 2023 Refractory materials - Test method for cold crushing strength at normal temperature"; the compressive creep rate is tested in accordance with "GB / T 5073 - 2005 Refractory materials - Compressive creep test method". Among them, a negative detected value indicates that the product shows an expansion direction during the detection process, and a positive detected value indicates that the product shows a compression direction during the detection process; Machinability test: Process 28 grooves on one side of each overflow brick support brick. If the following occurs after grooving Figure 1In the case of the edge defect shown, when the edge defect size a + b < 3 mm, the number is not counted; when 3 mm ≤ a + b ≤ 8 mm and the number of edge defects does not exceed 2, the overflow brick support brick is determined to be qualified. The test results are shown in Table 4-6: Table 4 Performance test results of the overflow brick support bricks processed in Examples 1-9

[0030] Table 5 Performance test results of the overflow brick support bricks processed in Comparative Examples 1-5

[0031] Table 6 Performance test results of the overflow brick support bricks processed in Comparative Examples 6-10

[0032] As can be seen from Table 4, for the overflow brick support bricks processed from zirconia-zirconolite composites in Examples 1-9, the apparent porosity is 11.4-13.6%, and the bulk density is 4.05-4.2 g / cm 3 , and the normal temperature compressive strength is stably within the range of 210-285 MPa; the compressive creep rate at 1300 °C and 0.5 MPa for 50 h is all below -0.008%, which is significantly lower than that in Comparative Examples 1-5. Moreover, there is no edge defect with a + b ≥ 3 mm after processing, and the products meet the qualified requirements at one time after processing, without any waste products.

[0033] Comparing Example 1 and Comparative Example 1, in Comparative Example 1, no desiliconized zircon powder is added. The apparent porosity of the overflow brick support brick processed is 0.2%, and the bulk density is 4.41 g / cm 3 , and the normal temperature compressive strength reaches 463 MPa. The high strength of the overflow brick support brick results in 3 edge defects with a + b > 3 mm after processing, so it is determined as a waste product. Although the overflow brick support brick in Comparative Example 1 has a high density, the compressive creep rate is -0.016%, indicating that the addition of zirconium pyrophosphate alone has a certain effect on reducing the compressive creep rate. However, for the zirconia-zirconolite composite material prepared without adding desiliconized zircon powder, it has a high density and high hardness at normal temperature, making it difficult to process.

[0034] Comparing Example 1 and Comparative Example 2, in Comparative Example 2, too little desiliconized zircon powder is added, resulting in the apparent porosity of the overflow brick support brick processed reaching 1.3%, and the bulk density is 4.37 g / cm 3 , and the normal temperature compressive strength reaches 396 MPa. The high strength leads to 2 edge defects with a + b > 3 mm after processing. Although the overflow brick support brick in Comparative Example 2 has a relatively high density, the compressive creep rate is -0.02%, indicating that when the addition amount of desiliconized zircon powder is too small, its effect on reducing the compressive creep rate and improving the processing performance is very limited, and it still has the problem of being difficult to process due to high density and high hardness.

[0035] Comparing Example 1 with Comparative Example 3, in Comparative Example 3, excessive desiliconized zirconium powder was added, resulting in the processed overflow brick support brick having an apparent porosity of 18.5% and a bulk density of 3.76 g / cm 3 The room temperature compressive strength reaches 355MPa, which is high in strength. After processing, there are 3 edges with a+b>3mm, and the compressive creep rate is -0.022%. This shows that the excessive desiliconized zirconium powder reduces the density of the product, but ZrO 2 The problems of high hardness and brittleness caused by its own chemical properties have only been improved to a limited extent; at the same time, the added zirconium pyrophosphate has a limited effect on reducing the compressive creep rate.

[0036] Comparing Example 3 with Comparative Example 4, in Comparative Example 4, zirconium pyrophosphate is not added, resulting in the processed overflow brick support brick having an apparent porosity of 16% and a bulk density of 4.11 g / cm 3 The room temperature compressive strength reaches 420MPa, with high strength and a compressive creep rate of -0.034%. This shows that when only desiliconized zirconium powder is added without adding zirconium pyrophosphate, the obtained product still has the problems of high hardness, high brittleness, poor processing performance, and a high compressive creep rate. Comparing Example 3 with Comparative Example 5, the amount of zirconium pyrophosphate added in Comparative Example 5 is too little, resulting in the apparent porosity of the processed overflow brick support brick reaching 15.6% and the bulk density being 4.09 g / cm 3 The room temperature compressive strength reaches 394MPa, with high strength and a compressive creep rate of -0.03%. This shows that when the amount of zirconium pyrophosphate added is too small, it has a limited effect on improving the processing performance of overflow bricks and supporting bricks, and has a small effect on improving the compressive creep rate.

[0037] Comparing Example 3 with Comparative Example 6, in Comparative Example 6, excessive zirconium pyrophosphate was added, resulting in the processed overflow brick supporting brick having an apparent porosity of 15.2% and a bulk density of 4.07 g / cm 3 The compressive strength at room temperature is only 160MPa, which is relatively low. The overflow bricks and supporting bricks after processing have no defects, but the compressive creep rate is relatively high. It is speculated that excessive zirconium pyrophosphate will cause excessive crystal growth during high-temperature sintering, resulting in easy lamellar fracture. Excessive zirconium pyrophosphate can improve processing performance, but it is not good for the compressive creep rate.

[0038] Comparing Example 8 with Comparative Example 7, the zircon powder added in Comparative Example 7 is too little, resulting in the processed overflow brick support brick having an apparent porosity of 15.4% and a bulk density of 4.03 g / cm 3 The compressive strength at room temperature is only 178MPa, the creep rate is -0.028%, the strength is low, and the overflow brick support brick after processing has no defects. This shows that adding too little zircon powder will reduce the volume density and compressive strength, because ZrO 2Problems such as high hardness and brittleness caused by its inherent properties are reduced due to the decrease in the addition amount of zircon powder. At the same time, under the combined action of zirconium pyrophosphate, the product obtains good workability, but the improvement effect on the compression creep rate is not significant.

[0039] Comparing Example 9 and Comparative Example 8, in Comparative Example 8, an excessive amount of zircon powder was added, resulting in the apparent porosity of the overflow brick support brick being only 1.6% after processing, and the bulk density reaching 4.33 g / cm 3 , and the cold compressive strength at room temperature is as high as 440 MPa. The strength is too high, and there are 3 edges with a + b > 3 mm missing after processing, and the compression creep rate is -0.024%. It shows that although zirconium pyrophosphate is added in Comparative Example 8, when too much zircon powder is added, it will increase the cold compressive strength at room temperature, affecting the processing performance and compression creep rate of the overflow brick support brick.

[0040] Comparing Example 1 and Comparative Example 9, in Comparative Example 9, yttrium-stabilized zirconia was used instead of desilicated zircon powder. The apparent porosity of the overflow brick support brick after processing is 12.3%, and the bulk density reaches 4.15 g / cm 3 , and the cold compressive strength at room temperature is as high as 355 MPa. There are 2 edges with a + b > 3 mm missing after processing, and the compression creep rate is -0.01%. It shows that when using yttrium-stabilized zirconia instead of desilicated zircon powder, Y 2 O 3 as a solid solution can stabilize the ZrO 2 phase transformation, inhibit its polymorphic transformation during heating and cooling, enable the product to obtain good apparent porosity and bulk density, improve the strength and stability of the product, and the compression creep rate of the product is good, but it will make the processing performance of the product worse.

[0041] Comparing Example 2 and Comparative Example 10, in Comparative Example 10, yttrium-stabilized zirconia was used instead of zirconium pyrophosphate. The apparent porosity of the overflow brick support brick after processing is 14.1%, and the bulk density reaches 4.1 g / cm 3 , and the cold compressive strength at room temperature is as high as 350 MPa. There are 2 edges with a + b > 3 mm missing after processing, and the compression creep rate is -0.013%. It shows that in Comparative Example 10, using yttrium-stabilized zirconia instead of zirconium pyrophosphate, Y 2 O 3 as a stabilizer can stabilize the ZrO 2 phase transformation, can improve the strength of the product, and the compression creep rate is good, but the increase in strength increases the processing difficulty of the product and increases the processing defects of the product.

Claims

1. A zirconium oxide-zircon composite material, characterized in that: The invention comprises the following raw materials in percentage by mass, wherein the total mass of the raw materials other than the organic binder is taken as 100%, and the organic binder is taken as the percentage of the total mass of the remaining raw materials: zircon powder 82-88%, desiliconized zirconium powder 8-14%, zirconium pyrophosphate 1-6%, titanium dioxide 0.5-1%, and organic binder 1.5-4.5%; ZrO2 in the desiliconized zirconium powder is greater than 98wt.%, and the purity of zirconium pyrophosphate is greater than 99wt.%.

2. The zirconium oxide-zircon composite material according to claim 1, characterized in that: In the zircon powder, ZrO2>65wt.%, SiO2<34wt.%, Al2O3<0.2wt.%, Fe2O3<0.1wt.%, and particle size<320 mesh.

3. The zirconium oxide-zircon composite material according to claim 1, characterized in that: The particle size of the desiliconized zirconium powder is less than 320 meshes.

4. The zirconium oxide-zircon composite material according to claim 1, characterized in that: The median diameter D of the zirconium pyrophosphate 50 <5μm.

5. The zirconium oxide-zircon composite material according to claim 1, characterized in that: In the titanium dioxide, TiO2>98.5wt.%, and particle size<320 mesh.

6. The zirconium oxide-zircon composite material according to claim 1, characterized in that: The organic binder is a composition of phenolic resin, carboxymethyl cellulose and polyvinyl alcohol in a mass ratio of 1:1:

1.

7. The method for preparing the zirconium oxide-zircon composite material according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1 wet ball milling: add an organic binder into a ball mill and add water for pre-grinding; then add zircon powder, desiliconized zirconium powder, zirconium pyrophosphate and titanium dioxide into the ball mill for grinding to obtain slurry; S2 granulation: spray granulate the slurry, and sieve the granulated powder; S3 molding: the granulated powder is loaded into a mold and isostatically pressed to obtain a green body; S4 sintering: sinter the green body at 1500-1600°C for 12-36h, with a heating rate of 3-6°C / h; after sintering, cool to 1000°C at a cooling rate of 3-4°C / h, and continue cooling at a cooling rate of 5-7°C / h to obtain a zirconium oxide-zircon composite material.

8. The method for preparing the zirconium oxide-zircon composite material according to claim 7, characterized in that: In step S1, the median diameter D of the mud 50 =3-6μm.

9. The method for preparing the zirconium oxide-zircon composite material according to claim 7, characterized in that: In step S3, the isostatic pressing pressure is 120-200 MPa.

10. Use of the zirconium oxide-zircon composite material according to any one of claims 1 to 6, characterized in that: The zirconia-zircon composite material is processed into an overflow brick support brick by grooving: the zirconia-zircon composite material is processed into a cube using a cutting and grinding tool, and then a plurality of parallel grooves are respectively processed on the four sides of the cube to obtain an overflow brick support brick.

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