High-flux alumina through-hole ceramic material and preparation method thereof
By optimizing the preparation process of alumina through-hole ceramics and utilizing various pore-forming methods and additives, directional strip-shaped pores and three-dimensional interconnected structures are formed, solving the problems of pore size control and dielectric properties in existing alumina through-hole ceramic materials. This enables the preparation of alumina through-hole ceramic materials with high porosity, high strength, and low dielectric loss.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-15
- Publication Date
- 2026-04-21
AI Technical Summary
Existing alumina through-hole ceramic materials suffer from problems such as high porosity and high strength, difficulty in precisely controlling pore size and distribution, poor dielectric properties and high dielectric loss, and complex and costly preparation processes.
Using α-alumina, aluminum hydroxide, and ρ-alumina as the main raw materials, and adding polymethyl methacrylate microspheres, polyethylene oxide, carbon fiber, and titanium dioxide, directional strip-shaped pores and three-dimensional interconnected pore structures are formed through freeze-drying and sintering processes. The pore size and distribution are precisely controlled by using a variety of pore-forming methods.
High-throughput alumina through-hole ceramic materials were prepared, which have high porosity, high compressive strength, low dielectric constant and low dielectric loss. The process is simple, low cost and high production efficiency, making it suitable for industrial production.
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of alumina through-hole ceramic materials. Specifically, it relates to a high-throughput alumina through-hole ceramic material and its preparation method. Background Technology
[0002] Alumina through-hole ceramics possess excellent properties such as inexpensive raw materials, high material strength, low thermal conductivity, and anti-aging properties. However, current alumina through-hole ceramics still face many challenges, such as the incompatibility between high porosity and high strength, difficulty in precisely controlling pore size and distribution, poor dielectric properties and high dielectric loss, and complex and costly manufacturing processes. Therefore, the preparation of alumina through-hole ceramics has attracted the attention of those skilled in the art. The patented technology, "A Method for Preparing an Alumina Through-hole Ceramic Valve" (ZL2015106728002), uses a combination of gel injection molding and pore-forming agent methods to produce an alumina through-hole ceramic valve. However, it suffers from high risks during glue removal, difficult operation, and the potential for through-cracks or localized expansion due to improper temperature control. Furthermore, it is difficult to control the size and distribution of pores, and has a long production cycle.
[0003] Reference I (Kang Yong, Zhang Qing. Research on the preparation of porous alumina ceramics by organic foam impregnation method [J]. Foshan Ceramics, 2016, 26(11):45-49.) used organic foam impregnation method to prepare a porous alumina ceramic with uniform pore distribution, through-hole structure and three-dimensional network structure, with a porosity of up to 93%. However, the strength was too low, the pore size was completely dependent on the foam template, and it was difficult to prepare products with finer pore size.
[0004] Reference II (Dele-Afolabi TT, Azmah Hanim MA, Jung DW, et al. Rice huskas a pore-forming agent: impact of particle size on the porosity and dielectric tensile strength of porous alumina ceramics[J]. Coatings, 2022, 12(9): 1259.) used rice husks as a pore-forming agent. Although it prepared alumina through-hole ceramics with high porosity and certain strength, the strength was low. Moreover, the pore-forming agent was prone to agglomeration during the mixing process, resulting in large-sized pores or pore clusters after sintering. It was even more difficult to form a three-dimensional interconnected pore structure. Furthermore, if the pores were random and irregular, it would lead to uneven distribution of the electric field inside the material, resulting in high dielectric loss.
[0005] Reference III (Zhang G, Zou B, Wang X, et al. The 3D-Printed building and performance of Al2O3 ceramic filters with gradient hole density structures[J]. Ceramics International, 2023, 49(19): 31496-31508.) used a self-made ceramic paste and photopolymerization 3D printing to produce alumina through-hole ceramics with gradient hole density structures, but the strength was low, and the equipment cost was high and the production efficiency was low. Summary of the Invention
[0006] The present invention aims to overcome the defects of the prior art and provides a method for preparing high-throughput alumina through-hole ceramic materials that is simple in process, has a short production cycle, low cost, precise control over pore size and distribution, and high production efficiency. The high-throughput alumina through-hole ceramic materials prepared by this method have high porosity, high compressive strength, three-dimensional interconnected pore structure, low dielectric constant, and low dielectric loss.
[0007] To achieve the above objectives, the specific steps of the technical solution adopted by the present invention are as follows: Step 1: Using 69.5~72.8wt% α-alumina, 21.4~24.4wt% aluminum hydroxide and 5.7~6.1wt% p-alumina as raw materials, add 5~20wt% polymethyl methacrylate microspheres, 0.5~0.7wt% polyethylene oxide, 0.4~0.5wt% sodium tripolyphosphate and 0.15~0.2wt% titanium dioxide to the raw materials, mix them evenly to obtain a mixture.
[0008] Step 2: Mix 0.5-2.0 wt% of carbon fiber, 36.9-40.84 wt% of water and 0.5-0.7 wt% of aluminum sol, and stir for 3-5 minutes to obtain mixed slurry I; then add 0.15-0.2 wt% of sodium dodecyl sulfonate to mixed slurry I, and stir for 3-5 minutes to obtain mixed slurry II.
[0009] Step 3: Pour the mixed slurry II into a mold, place the mold in a freeze dryer, and dry for 20-24 hours. The cold trap temperature of the freeze dryer is below -50°C to obtain an alumina ceramic green body. Then, under air atmosphere and normal pressure conditions, heat the alumina ceramic green body to 1400-1600°C, hold for 3-5 hours, and allow it to cool naturally to obtain a high-throughput alumina through-hole ceramic material.
[0010] The purity of the α-alumina is >99.9wt%; the particle size of the α-alumina is less than 2μm.
[0011] The purity of the aluminum hydroxide is >99.9 wt%; the particle size of the aluminum hydroxide is less than 2 μm.
[0012] The purity of the p-alumina is >99.9wt%; the particle size of the p-alumina is less than 5μm.
[0013] The molecular weight of the polyethylene oxide is >1,000,000.
[0014] The purity of the sodium tripolyphosphate is >98wt%.
[0015] The carbon fiber has a purity > 99.9 wt%; the carbon fiber has a length of 1~3 mm and a diameter < 7 μm.
[0016] The concentration of the aluminum sol is >20wt%; the pH of the aluminum sol is 4.0~5.0.
[0017] The polymethyl methacrylate microspheres have a particle size of 13~48 μm. By adopting the above technical solutions, the present invention has the following advantages compared with the prior art: 1. This invention uses α-alumina as the main raw material to prepare high-throughput alumina through-hole ceramic material. The raw materials used are of high purity, non-corrosive, and unlikely to cause harm to the human body. They are environmentally friendly and conducive to the synthesis of high-purity, high-throughput alumina through-hole ceramics. This invention differs from 3D printing in the preparation of through-hole ceramics, does not require expensive equipment, and has a simple process and high production efficiency.
[0018] 2. The present invention adds titanium dioxide as a sintering aid to promote the sintering of alumina ceramic materials and inhibit grain growth, thereby improving the compressive strength and bulk density of high-throughput alumina through-hole ceramic materials.
[0019] 3. The cold trap temperature of the freeze dryer of this invention is below -50°C. During freeze drying, the low-temperature characteristics of liquid nitrogen and the high thermal conductivity of copper pillars create a directional temperature gradient from the high-temperature end to the low-temperature end inside the product, achieving directional heat conduction. This aligns the carbon fibers, resulting in uniformly oriented strip-shaped pores after burn-off. The pore interfaces of these oriented strip-shaped pores are parallel, continuous, and uniform, allowing for a smoother distribution of charge carriers on the uniform interface and preventing localized charge accumulation. Therefore, the high-flux alumina through-hole ceramic material exhibits low dielectric constant and low dielectric loss.
[0020] 4. This invention incorporates aluminum hydroxide and carbon fibers into α-alumina ceramic powder. During sintering, aluminum hydroxide decomposes in situ to form spherical pores, while carbon fibers burn off to form strip-shaped pores. Combined with pore-forming methods such as foaming agents, pore-forming agents, and sol-gel methods, the porosity is significantly improved through multiple pore-forming mechanisms. Therefore, the proportion of low-dielectric pores is high, resulting in a low dielectric constant. Simultaneously, the pore size and distribution of the high-flux alumina through-hole ceramic material can be precisely controlled. Therefore, this invention differs from particle packing and pore-forming agent methods, enabling precise control of pore uniformity, pore size, and distribution, forming a three-dimensional interconnected pore structure.
[0021] 5. This invention uses multiple pore-forming methods, unlike the organic foam impregnation method which completely depends on the foam template for pore size in the preparation of porous ceramics, to produce high-throughput alumina through-hole ceramic materials with finer pore sizes.
[0022] 6. The addition of carbon fiber in this invention not only allows for directional pore formation after carbon fiber burn-off, but also creates bridging, pull-out, and debonding effects in the matrix, significantly improving the compressive strength of high-throughput alumina through-hole ceramic materials.
[0023] The high-throughput alumina porous ceramic material prepared in this invention was analyzed by X-ray diffraction, and the main crystalline phase was found to be over 99.9% alumina. The bulk density was measured to be 1.21~2.02 g / cm³. 3 Apparent porosity is 47.5–70.1%; room temperature withstand voltage is 20.6–77.3 MPa; room temperature dielectric constant is 3.12–5.05 (at 10 GHz); room temperature dielectric loss is 1.3–3.4 × 10⁻⁶. -3 (Frequency is 10GHz).
[0024] Therefore, the present invention has a simple process, short production cycle, environmental friendliness, low cost, high production efficiency and industrial production capability. The high-throughput alumina through-hole ceramic material prepared has both high porosity and high strength, precise controllable pore size and distribution, can form a three-dimensional interconnected pore structure, and has low dielectric constant and low dielectric loss. Detailed Implementation
[0025] The present invention will be further described below with reference to specific embodiments, but this is not intended to limit the scope of protection of the present invention.
[0026] A high-throughput alumina porous ceramic material and its preparation method. The preparation method described in this specific embodiment is as follows: Step 1: Using 69.5~72.8wt% α-alumina, 21.4~24.4wt% aluminum hydroxide and 5.7~6.1wt% p-alumina as raw materials, add 5~20wt% polymethyl methacrylate microspheres, 0.5~0.7wt% polyethylene oxide, 0.4~0.5wt% sodium tripolyphosphate and 0.15~0.2wt% titanium dioxide to the raw materials, mix them evenly to obtain a mixture.
[0027] Step 2: Mix 0.5-2.0 wt% of carbon fiber, 36.9-40.84 wt% of water and 0.5-0.7 wt% of aluminum sol, and stir for 3-5 minutes to obtain mixed slurry I; then add 0.15-0.2 wt% of sodium dodecyl sulfonate to mixed slurry I, and stir for 3-5 minutes to obtain mixed slurry II.
[0028] Step 3: Pour the mixed slurry II into a mold, place the mold in a freeze dryer, and dry for 20-24 hours. The cold trap temperature of the freeze dryer is below -50°C to obtain an alumina ceramic green body. Then, under air atmosphere and normal pressure conditions, heat the alumina ceramic green body to 1400-1600°C, hold for 3-5 hours, and allow it to cool naturally to obtain a high-throughput alumina through-hole ceramic material.
[0029] The molecular weight of the polyethylene oxide is >1,000,000.
[0030] The purity of the sodium tripolyphosphate is >98wt%.
[0031] The length of the carbon fiber is 1~3mm.
[0032] The concentration of the aluminum sol is 20-23 wt%; the pH of the aluminum sol is 2.2-3.0.
[0033] The polymethyl methacrylate microspheres have a particle size of 13~48 μm.
[0034] In this specific implementation: The purity of the α-alumina is >99.9wt%; the particle size of the α-alumina is less than 2μm.
[0035] The purity of the aluminum hydroxide is >99.9 wt%; the particle size of the aluminum hydroxide is less than 2 μm.
[0036] The purity of the p-alumina is >99.9wt%; the particle size of the p-alumina is less than 5μm.
[0037] The purity of the carbon fiber is >99.9wt%; the diameter of the carbon fiber is <7μm.
[0038] The details will not be repeated in the examples.
[0039] Example 1 A method for preparing a high-throughput alumina through-hole ceramic material. The preparation method described in this embodiment is as follows: Step 1: Using 72.9 wt% α-alumina, 21.4 wt% aluminum hydroxide and 5.7 wt% p-alumina as raw materials, add 5 wt% polymethyl methacrylate microspheres, 0.7 wt% polyethylene oxide, 0.5 wt% sodium tripolyphosphate and 0.15 wt% titanium dioxide of the above raw materials, mix them evenly to obtain a mixture.
[0040] Step 2: Mix 0.5 wt% carbon fiber, 36.9 wt% water and 0.5 wt% aluminum sol, and stir for 3 minutes to obtain mixed slurry I; then add 0.15 wt% sodium dodecyl sulfonate to mixed slurry I, and stir for 3 minutes to obtain mixed slurry II.
[0041] Step 3: Pour the mixed slurry II into a mold, place the mold in a freeze dryer, and dry for 20 hours. The cold trap temperature of the freeze dryer is below -50°C to obtain an alumina ceramic blank. Then, under air atmosphere and normal pressure conditions, heat the alumina ceramic blank to 1400°C, hold for 5 hours, and cool naturally to obtain a high-throughput alumina through-hole ceramic material.
[0042] The molecular weight of the polyethylene oxide is 1,000,000.
[0043] The purity of the sodium tripolyphosphate is 98.1 wt%.
[0044] The carbon fiber has a length of 3 mm.
[0045] The concentration of the aluminum sol is 20 wt%; the pH of the aluminum sol is 3.0.
[0046] The polymethyl methacrylate microspheres have a particle size of 13 μm.
[0047] The high-throughput alumina porous ceramic material prepared in this example was analyzed by X-ray diffraction, and the main crystalline phase was found to be over 99.9% α-alumina. The bulk density was measured to be 2.02 g / cm³. 3 Apparent porosity 47.5%; room temperature withstand voltage 77.3 MPa; room temperature dielectric constant 5.05 (at 10 GHz); room temperature dielectric loss 2.1 × 10⁻⁶. -3 (10GHz).
[0048] Example 2 A method for preparing a high-throughput alumina through-hole ceramic material. The preparation method described in this embodiment is as follows: Step 1: Using 71.7 wt% α-alumina, 22.4 wt% aluminum hydroxide and 5.9 wt% p-alumina as raw materials, add 10 wt% polymethyl methacrylate microspheres, 0.65 wt% polyethylene oxide, 0.47 wt% sodium tripolyphosphate and 0.17 wt% titanium dioxide of the above raw materials, mix them evenly to obtain a mixture.
[0049] Step 2: Mix 1.0 wt% of carbon fiber, 38.9 wt% of water and 0.55 wt% of aluminum sol, and stir for 3.5 min to obtain mixed slurry I; then add 0.16 wt% of sodium dodecyl sulfonate to mixed slurry I, and stir for 3.5 min to obtain mixed slurry II.
[0050] Step 3: Pour the mixed slurry II into a mold, place the mold in a freeze dryer, and dry for 21 hours. The cold trap temperature of the freeze dryer is below -50°C to obtain an alumina ceramic green body. Then, under air atmosphere and normal pressure conditions, heat the alumina ceramic green body to 1450°C, hold for 4.5 hours, and allow it to cool naturally to obtain a high-throughput alumina through-hole ceramic material.
[0051] The molecular weight of the polyethylene oxide is 2,000,000.
[0052] The purity of the sodium tripolyphosphate is 98.3 wt%.
[0053] The carbon fiber has a length of 2.5 mm.
[0054] The concentration of the aluminum sol is 21 wt%; the pH of the aluminum sol is 2.8.
[0055] The polymethyl methacrylate microspheres have a particle size of 25 μm.
[0056] The high-throughput alumina porous ceramic material prepared in this example was analyzed by X-ray diffraction, and the main crystalline phase was found to be over 99.9% α-alumina. The bulk density was measured to be 1.85 g / cm³. 3 Apparent porosity 53.5%; room temperature withstand voltage 55.3 MPa; room temperature dielectric constant 4.55 (frequency 10 GHz); room temperature dielectric loss 2.8 × 10⁻⁶. -3 (10GHz).
[0057] Example 3 A method for preparing a high-throughput alumina through-hole ceramic material. The preparation method described in this embodiment is as follows: Step 1: Using 70.3 wt% α-alumina, 23.9 wt% aluminum hydroxide and 5.8 wt% p-alumina as raw materials, add 15 wt% polymethyl methacrylate microspheres, 0.6 wt% polyethylene oxide, 0.45 wt% sodium tripolyphosphate and 0.18 wt% titanium dioxide of the above raw materials, mix them evenly to obtain a mixture.
[0058] Step 2: Mix 1.5 wt% carbon fiber, 39.9 wt% water and 0.6 wt% aluminum sol, and stir for 4 min to obtain mixed slurry I; then add 0.18 wt% sodium dodecyl sulfonate to mixed slurry I, and stir for 4 min to obtain mixed slurry II.
[0059] Step 3: Pour the mixed slurry II into a mold, place the mold in a freeze dryer, and dry for 23 hours. The cold trap temperature of the freeze dryer is below -50°C to obtain an alumina ceramic green body. Then, under air atmosphere and normal pressure conditions, heat the alumina ceramic green body to 1500°C, hold for 4 hours, and cool naturally to obtain a high-throughput alumina through-hole ceramic material.
[0060] The molecular weight of the polyethylene oxide is 3,000,000.
[0061] The purity of the sodium tripolyphosphate is 98.5 wt%.
[0062] The carbon fiber has a length of 2 mm.
[0063] The concentration of the aluminum sol is 22 wt%; the pH of the aluminum sol is 2.5.
[0064] The polymethyl methacrylate microspheres have a particle size of 37 μm.
[0065] The high-throughput alumina porous ceramic prepared in this example was analyzed by X-ray diffraction, and the main crystalline phase was found to be over 99.9% α-alumina. The bulk density was measured to be 1.49 g / cm³. 3 Apparent porosity: 61.6%; room temperature withstand voltage: 48.7 MPa; room temperature dielectric constant: 3.94 (at 10 GHz); room temperature dielectric loss: 1.3 × 10⁻⁶. -3 (10GHz).
[0066] Example 4 A method for preparing a high-throughput alumina through-hole ceramic material. The preparation method described in this embodiment is as follows: Step 1: Using 69.5 wt% α-alumina, 24.4 wt% aluminum hydroxide and 6.1 wt% p-alumina as raw materials, add 20 wt% polymethyl methacrylate microspheres, 0.5 wt% polyethylene oxide, 0.4 wt% sodium tripolyphosphate and 0.2 wt% titanium dioxide of the above raw materials, mix them evenly to obtain a mixture.
[0067] Step 2: Mix 2.0 wt% carbon fiber, 40.84 wt% water and 0.7 wt% aluminum sol, and stir for 5 min to obtain mixed slurry I; then add 0.2 wt% sodium dodecyl sulfonate to mixed slurry I, and stir for 5 min to obtain mixed slurry II.
[0068] Step 3: Pour the mixed slurry II into a mold, place the mold in a freeze dryer, and dry for 24 hours. The cold trap temperature of the freeze dryer is below -50°C to obtain an alumina ceramic green body. Then, under air atmosphere and normal pressure conditions, heat the alumina ceramic green body to 1600°C, hold for 3 hours, and cool naturally to obtain a high-throughput alumina through-hole ceramic material.
[0069] The molecular weight of the polyethylene oxide is 4,000,000.
[0070] The purity of the sodium tripolyphosphate is 98.8 wt%.
[0071] The carbon fiber has a length of 1 mm.
[0072] The concentration of the aluminum sol is 23 wt%; the pH of the aluminum sol is 2.2.
[0073] The polymethyl methacrylate microspheres have a particle size of 48 μm.
[0074] The high-throughput alumina porous ceramic material prepared in this example was analyzed by X-ray diffraction, and the main crystalline phase was found to be over 99.9% α-alumina. The bulk density was measured to be 1.21 g / cm³. 3 Apparent porosity 70.1%; room temperature withstand voltage 20.6 MPa; room temperature dielectric constant 3.12 (at 10 GHz); room temperature dielectric loss 3.4 × 10⁻⁶. -3 (10GHz).
[0075] This specific implementation method has the following advantages compared with the prior art: 1. This specific embodiment uses α-alumina as the main raw material to prepare high-throughput alumina through-hole ceramic material. The raw materials used are of high purity, non-corrosive, and unlikely to cause harm to the human body. They are environmentally friendly and conducive to the synthesis of high-purity, high-throughput alumina through-hole ceramics. This specific embodiment differs from the 3D printing method for preparing through-hole ceramics, does not require expensive equipment costs, and has a simple process and high production efficiency.
[0076] 2. In this specific embodiment, titanium dioxide, a sintering aid, is added to promote the sintering of alumina ceramic materials and inhibit grain growth, thereby improving the compressive strength and bulk density of high-throughput alumina through-hole ceramic materials.
[0077] 3. In this specific embodiment, the cold trap temperature of the freeze dryer is below -50°C. During freeze drying, the low-temperature characteristics of liquid nitrogen and the high thermal conductivity of the copper pillars create a directional temperature gradient from the high-temperature end to the low-temperature end inside the product, achieving directional heat conduction. This aligns the carbon fibers, resulting in uniformly oriented strip-shaped pores after burn-off. The pore interfaces of these oriented strip-shaped pores are parallel, continuous, and uniform, allowing for a smoother distribution of charge carriers and preventing localized charge accumulation. Therefore, the high-flux alumina through-hole ceramic material exhibits low dielectric constant and low dielectric loss.
[0078] 4. In this specific embodiment, aluminum hydroxide and carbon fibers are added to α-alumina ceramic powder. During sintering, aluminum hydroxide decomposes in situ to form spherical pores, while carbon fibers burn off to form strip-shaped pores. Combined with pore-forming methods such as foaming agents, pore-forming agents, and sol-gel methods, the porosity is significantly improved through multiple pore-forming mechanisms. Therefore, the proportion of low-dielectric pores is high, resulting in a low dielectric constant. Simultaneously, the pore size and distribution of the high-flux alumina through-hole ceramic material can be precisely controlled. Therefore, this specific embodiment differs from particle packing and pore-forming agent methods, enabling precise control of pore uniformity, pore size, and distribution, forming a three-dimensional interconnected pore structure.
[0079] 5. This specific embodiment uses multiple pore-forming methods, unlike the organic foam impregnation method which completely depends on the foam template for pore size in the preparation of porous ceramics, to produce high-throughput alumina through-hole ceramic materials with finer pore sizes.
[0080] 6. The addition of carbon fiber in this specific embodiment not only allows for directional pore formation after carbon fiber burn-off, but also creates bridging, pull-out, and debonding effects in the matrix, significantly improving the compressive strength of the high-throughput alumina through-hole ceramic material.
[0081] The high-throughput alumina porous ceramic material prepared in this specific embodiment was analyzed by X-ray diffraction, and the main crystalline phase was more than 99.9% alumina. The prepared high-throughput alumina porous ceramic material was tested and found to have a bulk density of 1.21~2.02 g / cm³. 3Apparent porosity is 47.5–70.1%; room temperature withstand voltage is 20.6–77.3 MPa; room temperature dielectric constant is 3.12–5.05 (at 10 GHz); room temperature dielectric loss is 1.3–3.4 × 10⁻⁶. -3 (Frequency is 10GHz).
[0082] Therefore, this specific implementation method has a simple process, short production cycle, environmental friendliness, low cost, high production efficiency and industrial production capability. The high-throughput alumina through-hole ceramic material prepared has both high porosity and high strength, precise controllable pore size and distribution, can form a three-dimensional interconnected pore structure, and has low dielectric constant and low dielectric loss.
Claims
1. A method for preparing a high-throughput alumina through-hole ceramic material, characterized in that... The preparation method comprises the following steps: Step 1: Using 69.5~72.8wt% α-alumina, 21.4~24.4wt% aluminum hydroxide and 5.7~6.1wt% p-alumina as raw materials, add 5~20wt% polymethyl methacrylate microspheres, 0.5~0.7wt% polyethylene oxide, 0.4~0.5wt% sodium tripolyphosphate and 0.15~0.2wt% titanium dioxide to the raw materials, mix them evenly to obtain a mixture; Step 2: Mix 0.5-2.0 wt% of carbon fiber, 36.9-40.84 wt% of water, and 0.5-0.7 wt% of aluminum sol, and stir for 3-5 minutes to obtain mixed slurry I; then add 0.15-0.2 wt% of sodium dodecyl sulfonate to mixed slurry I, and stir for 3-5 minutes to obtain mixed slurry II; Step 3: Pour the mixed slurry II into a mold, place the mold in a freeze dryer, and dry for 20-24 hours. The cold trap temperature of the freeze dryer is below -50°C to obtain an alumina ceramic green body. Then, under air atmosphere and normal pressure conditions, heat the alumina ceramic green body to 1400-1600°C, hold for 3-5 hours, and allow it to cool naturally to obtain a high-throughput alumina through-hole ceramic material.
2. The method for preparing high-throughput alumina porous ceramic material according to claim 1, characterized in that, The purity of the α-alumina is >99.9wt%; the particle size of the α-alumina is less than 2μm.
3. The method for preparing the high-throughput alumina through-hole ceramic material according to claim 1, characterized in that, The purity of the aluminum hydroxide is >99.9 wt%; the particle size of the aluminum hydroxide is less than 2 μm.
4. The method for preparing the high-throughput alumina through-hole ceramic material according to claim 1, characterized in that, The purity of the p-alumina is >99.9wt%; the particle size of the p-alumina is less than 5μm.
5. The method for preparing the high-throughput alumina through-hole ceramic material according to claim 1, characterized in that, The molecular weight of the polyethylene oxide is >1,000,000.
6. The method for preparing the high-throughput alumina through-hole ceramic material according to claim 1, characterized in that, The purity of the sodium tripolyphosphate is >98wt%.
7. The method for preparing the high-throughput alumina through-hole ceramic material according to claim 1, characterized in that, The carbon fiber has a purity > 99.9 wt%; the carbon fiber has a length of 1~3 mm and a diameter < 7 μm.
8. The method for preparing the high-throughput alumina through-hole ceramic material according to claim 1, characterized in that, The concentration of the aluminum sol is >20wt%; the pH of the aluminum sol is 4.0~5.
0.
9. The method for preparing the high-throughput alumina through-hole ceramic material according to claim 1, characterized in that, The polymethyl methacrylate microspheres have a particle size of 13~48 μm.
10. A high-throughput alumina through-hole ceramic material, characterized in that... The high-throughput alumina through-hole ceramic material is a high-throughput alumina through-hole ceramic material prepared by the preparation method of the high-throughput alumina through-hole ceramic material according to any one of claims 1 to 9.