Processing technology of high-strength ceramic green body
By introducing a three-dimensional silica sol network structure into the ceramic green body and coating the surface with methyl water, the problem of the decrease in strength of the ceramic green body after contact with water was solved, the strength of both dry and wet green bodies was improved, production costs and energy consumption were reduced, and the yield was increased.
Patent Information
- Application Number
- CN202512020034.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-03-13
AI Technical Summary
In the current technology, the strength of the ceramic green body decreases after it comes into contact with water during the processing of ceramic green bodies, which increases the risk of cracking bricks and affects the yield and production efficiency. In addition, the existing solutions have problems such as high equipment costs, high energy consumption and long research cycles.
A three-dimensional network structure is formed by combining silica sol solution with a green body reinforcing agent, and methyl water is coated on the surface of the green body to slow down the rate of water penetration and enhance the structural stability of the green body.
It significantly improves the strength of both dry and wet ceramic blanks, reduces the risk of brick cracking, increases production efficiency and yield, and reduces equipment costs and energy consumption.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of building ceramics, and in particular to a processing technology for high-strength ceramic green bodies. Background Technology
[0002] With the rapid development of the building ceramics and home decoration industries, the quality requirements for ceramic tiles are increasing. The performance of the ceramic body plays a crucial role in the ceramic production and processing process. In recent years, the surface technology of ceramic tiles has become increasingly complex, diverse, and refined. Advanced equipment and technologies, especially digital mold technology, are widely used both domestically and internationally. This technology can achieve a textured surface, impactful visual effects, and fine textures on ceramic tiles. However, in practical applications, digital mold technology requires the application of a large amount of glaze slurry to the ceramic body. This leads to an increase in the moisture content of the body. After the moisture penetrates into the body, it weakens the bonding force between the body particles, causes particle expansion that disrupts structural stability, and alters the pore structure, resulting in microstructural changes such as a sharp decrease in body strength. During the glaze line application process, the risk of tile cracking increases significantly, and defects such as breakage, cracks, broken corners, and missing edges are prone to occur, ultimately reducing the yield and affecting production efficiency and product quality.
[0003] To address the issue of decreased strength of ceramic green bodies when exposed to water, the industry has proposed several existing technical solutions to enhance the strength of wet green bodies after exposure to water. One type of solution involves increasing the forming pressure and body thickness of the press, increasing the proportion of highly plastic clay in the body formula, and adding an appropriate amount of body reinforcing agent to the ceramic slurry to first improve the drying strength of the ceramic green body, thereby indirectly improving the wet strength of the green body after exposure to water. Another type of solution involves setting up multiple drying devices on the glaze line, optimizing drying parameters, and improving the drying capacity of the glaze line to quickly remove moisture from the surface of the body, thereby further improving the wet strength of the green body after exposure to water. However, existing technical solutions still have certain shortcomings. For example, when increasing the forming pressure of the press to enhance the strength of the green body, excessive pressure can lead to limited effectiveness and easily cause sandwich defects, while also increasing equipment costs and energy consumption. Increasing the thickness of the green body will increase material costs and may also cause tile deformation or cracking during the firing process due to uneven oxidation and stress release. Adjusting the green body formula not only requires high research costs and long experimental cycles, but also increases the drying shrinkage, firing shrinkage and firing temperature of the green body by adding highly plastic clay. Adding reinforcing agents to ceramic slurry may lead to poor slurry fluidity, which in turn requires additional water and decoction agents, thus increasing the energy consumption and production cost of spray granulation. While setting up multiple drying and fan equipment on the glaze line can improve drying efficiency, it will significantly increase energy consumption. If the drying parameters are not properly controlled, more micro-cracks may be formed on the surface of the green body. For complex glaze processes such as digital mold superimposed positioning glue dry granules, researching suitable glaze line drying effects also requires more time and effort. Summary of the Invention
[0004] The main objective of this invention is to propose a processing technology for high-strength ceramic green bodies, which can significantly improve the strength of dry ceramic green bodies and the strength of wet green bodies after contact with water.
[0005] To achieve the above objectives, this invention proposes a processing technology for high-strength ceramic green bodies, comprising the following steps: S1. Mix ceramic raw materials with water and ball mill to obtain ceramic slurry. Add silica sol solution to ceramic slurry and stir evenly to obtain mixed slurry. S2. After drying the mixed slurry obtained in step S1, grind and sieve it, and press the sieved powder into a blank. S3. Dry the green body obtained in step S2 at 140~150℃ for 65~70 min and cool it to room temperature; apply methyl water to the surface of the green body and let it stand for 2~3 min to obtain the high-strength ceramic green body.
[0006] This invention slows down the rate at which water penetrates the ceramic body by applying methyl water, while introducing a waterproof silica sol three-dimensional network structure into the body to ensure that the body structure does not disperse when exposed to water, thus significantly enhancing the strength of the dry ceramic body and the strength of the wet ceramic body after exposure to water.
[0007] Preferably, step S2 further includes adding a green body reinforcing agent to the sieved powder and mixing it evenly. Through the combined effect of the inorganic binder, organic binder, organic bentonite, quartz powder and silica sol in the green body reinforcing agent, a three-dimensional cross-linked network filling structure is formed inside the green body, resulting in a more comprehensive and stable reinforcing effect on the green body.
[0008] Preferably, the raw material components of the green body reinforcing agent, by weight, include: 0.3-0.9 parts aluminum dihydrogen phosphate, 0.3-0.6 parts phenolic resin, 0-0.3 parts organobentonite, and 0-0.3 parts quartz powder. The inorganic and organic binders synergistically enhance the bonding force between green body particles. The organobentonite ensures the smooth progress of the green body forming process, avoiding structural instability caused by material characteristics during the forming stage. The quartz powder effectively reduces the shrinkage of the product during drying and subsequent firing, lowering the risk of deformation or cracking due to uneven shrinkage.
[0009] Preferably, the raw material components of the preform reinforcing agent, by weight, include: 0.5-0.7 parts aluminum dihydrogen phosphate, 0.5-0.6 parts phenolic resin, and 0.2-0.3 parts organobentonite. More preferably, the phenolic resin has a mesh size of 200-250 mesh, and the organobentonite has a mesh size of 500-600 mesh. The aluminum dihydrogen phosphate powder has a relatively large mesh size, which, combined with 200-mesh phenolic resin and 600-mesh organobentonite, forms a complementary "bonding and reinforcing system" with three different mesh sizes of binder components.
[0010] Preferably, the raw materials for the methyl water include sodium carboxymethyl cellulose, ethylene glycol, and water; wherein the mass ratio of sodium carboxymethyl cellulose: ethylene glycol: water is 0.8~1.2:5.5~6.5:95~105.
[0011] Preferably, the raw materials for the methyl water include sodium carboxymethyl cellulose, ethylene glycol, and water; wherein the mass ratio of sodium carboxymethyl cellulose: ethylene glycol: water is 1:6:100.
[0012] Preferably, the amount of silica sol solution added is 10 wt.% to 50 wt.% of the total dry powder weight of the ceramic slurry.
[0013] Preferably, the amount of silica sol solution added is 30 wt.% of the total dry powder weight of the ceramic slurry. The dry powder weight of the ceramic slurry specifically refers to the solid content after removing moisture from the ceramic slurry.
[0014] Preferably, the amount of the green body reinforcing agent added is 2 to 10 wt.% of the total weight of the powder after sieving.
[0015] Preferably, the amount of the green body reinforcing agent added is 6 wt.% of the total weight of the powder after sieving.
[0016] Preferably, the drying time in step S2 is 15-20 minutes. Avoid drying too quickly.
[0017] Compared with existing technologies, this invention has the following advantages: The green body reinforcing agent formula used in this invention is compounded with silica sol to introduce a waterproof silica sol three-dimensional network structure into the green body, ensuring that the green body structure does not disperse when exposed to water. Simultaneously, the application of methyl water to the surface slows down the rate at which water penetrates the green body. The processing technology described in this invention can significantly improve the strength of both dry and wet ceramic green bodies. Detailed Implementation
[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. At the same time, the raw materials mentioned below, unless otherwise specified, are all commercially available products; the process steps or preparation methods not mentioned in detail are all process steps or preparation methods known to those skilled in the art.
[0019] This embodiment provides a processing technology for high-strength ceramic green bodies, including the following steps: S1. Ceramic raw materials are mixed with water and ball-milled to obtain a ceramic slurry. A silica sol solution with a concentration of 25% to 35% is added to the ceramic slurry. More preferably, the concentration of the silica sol solution is 30%. The mixture is stirred evenly to obtain a mixed slurry. The amount of silica sol solution added is 10 wt.% to 50 wt.% of the total dry powder mass of the ceramic slurry. More preferably, the amount added is 30 wt.%.
[0020] S2. After drying the mixed slurry obtained in step S1 for 15-20 minutes, grind it through a 30-mesh sieve. Mix the sieved powder with the green body reinforcing agent evenly and press it into a green body. The raw material components of the green body reinforcing agent, by weight, include: 0.3-0.9 parts aluminum dihydrogen phosphate, 0.3-0.6 parts phenolic resin, 0-0.3 parts organobentonite, and 0-0.3 parts quartz powder. More preferably, the raw material components of the green body reinforcing agent, by weight, include: 0.5-0.7 parts aluminum dihydrogen phosphate, 0.5-0.6 parts phenolic resin, and 0.2-0.3 parts organobentonite. The amount of green body reinforcing agent added is 2-10 wt.% of the total weight of the sieved powder. More preferably, the amount added is 6 wt.%.
[0021] S3. The green body obtained in step S2 is dried at 140~150℃ for 65~70 min and cooled to room temperature; methyl water is applied to the surface of the green body and allowed to stand for 2~3 min to obtain the high-strength ceramic green body. The raw materials for the methyl water include sodium carboxymethyl cellulose, ethylene glycol, and water; wherein the mass ratio of sodium carboxymethyl cellulose: ethylene glycol: water is 0.8~1.2:5.5~6.5:95~105. More preferably, the mass ratio of sodium carboxymethyl cellulose: ethylene glycol: water is 1:6:100.
[0022] It is understood that in step S1, the ceramic slurry is a ceramic slurry processed by standard ball milling during the ceramic production process, achieving the required uniform particle size. The green body raw material is a known ceramic preparation raw material; those skilled in the art can adjust the green body formula as needed, and are not limited to the green body formula used in the specific embodiments of this application. The dry powder of the ceramic slurry specifically refers to the uniform powder obtained after drying the ceramic slurry. Therefore, the dry powder quality of the ceramic slurry specifically refers to the solid content after removing moisture. The concentration and amount of silica sol solution added in this scheme can be adjusted adaptively according to actual needs.
[0023] The ceramic slurry and silica sol solution should be stirred evenly, specifically ensuring that the silica sol solution is uniformly dispersed in every part of the ceramic slurry, without any localized areas of excessively high or low concentration. The mixing process should be monitored in real time, aiming for a stable, circulating flow without the formation of numerous air bubbles. After mixing, the resulting slurry should be placed in an environment with a stable temperature for later use.
[0024] In step S2, the drying speed should be avoided during the drying process, and the drying time should be 15-20 minutes. After drying and cooling to room temperature, the dried mixed slurry should be sieved through a 30-mesh sieve. When sieving, the dried slurry should be poured into the sieve slowly and evenly, while gently shaking the sieve to completely separate any small amount of coarse particles or impurities generated during the drying process. For larger particles or lumps that cannot pass through the sieve, use a grinding tool to moderately crush them, and then sieve again until all materials can pass through the 30-mesh sieve.
[0025] The powder sieved in step S2 is mixed with the green body reinforcing agent using a two-way stirring method to ensure all-round contact between the powder and the green body reinforcing agent until the mixture has a uniform color and no obvious agglomerates of green body reinforcing agent particles. Then, the mixed powder is transferred to a pressing and molding equipment to be pressed into a green body. The surface of the green body is then inspected to ensure it is flat, without obvious depressions or protrusions, and that the overall structure is intact without cracks or damage, thus guaranteeing the initial structural integrity of the green body.
[0026] In some preferred embodiments, in step S3, the billet is placed in an oven for drying. The oven is preheated to 150°C, and after the temperature stabilizes at 150°C, the billet is placed inside and dried at that temperature for 70 minutes. During the drying process, good ventilation must be maintained inside the oven to ensure that the moisture generated during the drying process can be discharged in a timely manner. After drying, the billet is removed and placed on a clean, level platform at room temperature to cool naturally to room temperature. During the application of methyl water, the surface of the billet must be completely covered. After applying the methyl water, the billet is placed in a windless environment at room temperature for 2-3 minutes. During this period, the methyl water will gradually adhere to the surface of the billet and form a stable coating layer. This coating layer can effectively slow down the rate at which moisture penetrates into the interior of the billet, thus ensuring improved water resistance.
[0027] In this invention, applying methyl water effectively slows down the rate at which subsequent moisture penetrates the green body, preventing a sharp drop in the bonding force between green body particles and damage to the microstructure caused by rapid moisture penetration. Furthermore, through the combined action of inorganic binders, organic binders, organic bentonite, quartz powder, and silica sol in the green body reinforcing agent, a three-dimensional cross-linked network filling structure is formed inside the green body. The inorganic and organic binders synergistically enhance the bonding force between green body particles; the organic bentonite ensures the smooth progress of the green body forming process, avoiding structural instability caused by material characteristics during forming; the quartz powder effectively reduces shrinkage during drying and subsequent firing, lowering the risk of deformation or cracking due to uneven shrinkage; and the silica sol provides waterproofing, further protecting the green body structure from moisture damage. This results in a more comprehensive and stable reinforcing effect of the three-dimensional cross-linked network filling structure on the green body, significantly improving the strength of both dry and wet ceramic green bodies.
[0028] The following examples further illustrate the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters in the following examples are merely one example within a suitable range; that is, those skilled in the art can make appropriate selections within the range based on the description herein, and are not intended to be limited to the specific values in the examples below. Where specific conditions are not specified in the examples, conventional conditions or conditions recommended by the manufacturer shall apply.
[0029] Product information for some of the raw materials used in the following examples and comparative examples includes: Silica sol: 30% alkaline silica sol, Guangzhou Panyu District Dalong Fufeng Chemical Raw Materials Business Department; Aluminum dihydrogen phosphate: Solid aluminum dihydrogen phosphate, Henan Borun Casting Materials Co., Ltd.; Phenolic resin: A105, Henan Zhongfan Dongsheng New Material Technology Co., Ltd.; Organic bentonite: Organic bentonite, Lingshou County Aotai Mineral Products Processing Plant; Quartz powder: commercially available; Sodium carboxymethyl cellulose: CH6, Changshu Weiyi Technology Co., Ltd.; Ethylene glycol: Commercially available.
[0030] The ceramic raw material formula used in the following examples and comparative examples is as follows (unit: parts by weight): 15 parts potassium feldspar, 15 parts sodium feldspar, 20 parts kaolin, 15 parts spherical clay, 5 parts wollastonite, 5 parts calcined talc, 2 parts zinc oxide, and 21 parts quartz. Example 1 A processing method for high-strength ceramic green bodies includes the following steps: S1. Ceramic raw materials are mixed with water and ball-milled to obtain ceramic slurry. Silica sol solution (30% alkaline) is added to the ceramic slurry and stirred evenly to obtain a mixed slurry. The percentage of silica sol solution added to the total dry powder mass of the ceramic slurry is shown in Table 1.
[0031] S2. After drying the mixed slurry obtained in step S1 for 15 minutes, grind it through a 30-mesh sieve and test the flow rate and specific gravity of the powder, as shown in Table 1. Press the powder into blanks with dimensions of 80 mm × 40 mm and a thickness of 4~5 mm; S3. Dry the green body obtained in step S2 at 150°C for 70 min, and cool it to room temperature; apply methyl water to the surface of the green body, wherein the methyl water is prepared by dispersing 1 kg of sodium carboxymethyl cellulose in 6 kg of ethylene glycol, and then mixing and dissolving it with 100 kg of water. Let it stand for 2-3 min to obtain the high-strength ceramic green body.
[0032] Comparative Example 1 A processing method for ceramic green bodies includes the following steps: S1. Ceramic raw materials were mixed with water and ball-milled to prepare a ceramic slurry. After drying for 15 minutes, the slurry was passed through a 30-mesh sieve, and the flow rate and specific gravity of the powder were measured, as shown in Table 1. The powder was then pressed into blanks with dimensions of 80 mm × 40 mm and a thickness of 4-5 mm. S2. Dry the green body obtained in step S1 at 150°C for 70 min and cool it to room temperature; thus, the ceramic green body is obtained.
[0033] Comparative Example 2 A processing method for ceramic green bodies includes the following steps: S1. Ceramic raw materials were mixed with water and ball-milled to obtain a ceramic slurry. The ceramic slurry was dried for 15 minutes and then passed through a 30-mesh sieve. The flow rate and specific gravity of the powder were measured, as shown in Table 1. The powder was then pressed into blanks with dimensions of 80 mm × 40 mm and a thickness of 4~5 mm. S2. Dry the green body obtained in step S1 at 150°C for 70 min, and cool it to room temperature; apply methyl water to the surface of the green body, wherein the methyl water is prepared by dispersing 1 kg of sodium carboxymethyl cellulose in 6 kg of ethylene glycol, and then mixing and stirring with 100 kg of water to dissolve it. Let it stand for 2-3 min to obtain the ceramic green body.
[0034] Comparative Example 3 A processing method for ceramic green bodies includes the following steps: S1. Ceramic raw materials are mixed with water and ball-milled to obtain ceramic slurry. Silica sol solution (30% alkaline) is added to the ceramic slurry and stirred evenly to obtain a mixed slurry. The percentage of silica sol solution added to the total dry powder mass of the ceramic slurry is shown in Table 1.
[0035] S2. After drying the mixed slurry obtained in step S1 for 15 minutes, grind it through a 30-mesh sieve and test the flow rate and specific gravity of the mixed powder, as shown in Table 1. Press the mixed powder into a blank with a size of 80 mm × 40 mm and a thickness of 4~5 mm; S3. Dry the green body obtained in step S2 at 150°C for 70 min and cool it to room temperature; thus, the ceramic green body is obtained.
[0036] The dry and wet strengths of the ceramic green bodies prepared in Example 1 and Comparative Examples 1-3 were tested respectively, using the following methods: 1. The flexural strength of the ceramic green bodies prepared in Example 1 and Comparative Examples 1 to 3 was directly tested and recorded as the dry body strength.
[0037] 2. Spray clean water evenly onto the surface of the ceramic green bodies prepared in Examples 1 and 1-3, and place them in a constant temperature and humidity curing environment for 10 minutes. After the water homogenization and penetration process is completed, test the flexural strength of the ceramic green bodies at this time, and record it as the wet body strength.
[0038] The flexural strength test standard is in accordance with the national standard GB / T 3810.4-2016.
[0039] The test results are shown in Table 1.
[0040] Table 1 Table 1 shows that the flow rate and specific gravity of the green body powder in Comparative Example 1 and Comparative Example 2, as well as the dry strength of the resulting ceramic green bodies, are similar. However, the wet strength of Comparative Example 2 is slightly higher than that of Comparative Example 1, indicating that the methyl water on the surface of the green body helps to slow down the penetration of water into the interior of the green body. In Comparative Example 3 (with added silica sol but without methyl water coating), the slurry flow rate decreases significantly, and the specific gravity also decreases, mainly due to the inherent properties of the silica sol solution. However, both the dry and wet strengths of the green body are improved, indicating that although silica sol does not have the effect of methyl water in slowing down water penetration, the waterproof three-dimensional network structure it forms still significantly enhances the strength of the green body. Furthermore, comparing Examples 1-3 (with methyl water coating and silica sol addition of 30 wt.%) with Comparative Examples 2-3 shows that the synergistic effect of silica sol and methyl water is greater than their individual effects.
[0041] The results from Examples 1-1 to 1-5 show that as the silica sol content increases, the slurry becomes thinner, the flow rate increases, the specific gravity decreases, and the difficulty of grinding after drying gradually increases. The dry and wet strengths of the resulting ceramic green bodies initially increase with increasing silica sol content, reaching their maximum when the silica sol content is 30 wt.%. Subsequently, with further increases in silica sol content, both dry and wet strengths gradually decrease. This is because when silica sol is added to the slurry, silica particles are distributed between the slurry particles. During drying, as water evaporates, the silica particles interact with other components in the slurry, filling the gaps between the slurry particles and acting as a binder, thus improving the dry strength. Since silica particles themselves are insoluble in water, the binder effect does not fail upon contact with water; therefore, the wet strength is also improved simultaneously. Therefore, overall, with increasing silica sol content, the dry and wet strengths of the ceramic green bodies are significantly improved. However, due to the excessive aggregation of silica particles in the slurry, forming large agglomerates, these agglomerates cause uneven stress distribution within the slurry during the drying process. When the slurry dries, this uneven stress easily causes cracks in the green body, which in turn reduces the strength of the green body. Therefore, as the silica sol content continues to increase, the dry and wet strength of ceramic green bodies actually begin to decrease.
[0042] In summary, when the amount of silica sol added is 30 wt.%, the dry and wet strengths of the ceramic green body reach their optimal levels.
[0043] Example 2 A processing method for high-strength ceramic green bodies includes the following steps: S1. Ceramic raw materials are mixed with water and ball-milled to obtain ceramic slurry. Silica sol solution (30% alkaline) is added to the ceramic slurry and stirred evenly to obtain a mixed slurry. The amount of silica sol solution added accounts for 30 wt.% of the total dry powder mass of the ceramic slurry.
[0044] S2. After drying the mixed slurry obtained in step S1 for 18 minutes, grind it through a 30-mesh sieve. Mix the sieved powder with the green body reinforcing agent evenly and press it into a green body with a size of 80 mm × 40 mm and a thickness of 4~5 mm. The raw material composition of the green body reinforcing agent is shown in Table 2. The amount of green body reinforcing agent added is 6 wt.% of the sieved powder.
[0045] S3. Dry the green body obtained in step S2 at 150°C for 70 min, and cool it to room temperature; apply methyl water to the surface of the green body, wherein the methyl water is prepared by dispersing 1 kg of sodium carboxymethyl cellulose in 6 kg of ethylene glycol, and then mixing and dissolving it with 100 kg of water. Let it stand for 2-3 min to obtain the high-strength ceramic green body.
[0046] The dry and wet strengths of the ceramic green bodies prepared in Example 2 were tested. The test results are shown in Table 2.
[0047] Table 2 As shown in Table 2, the dry strength of the ceramic green bodies prepared by each technical solution in Example 2 is superior to that in Example 1. This indicates that using a green body reinforcing agent combined with silica sol and methyl water can significantly improve the dry and wet strength of the ceramic green bodies.
[0048] When the aluminum dihydrogen phosphate content increased from 0.3 g to 0.6 g, both the dry and wet blank strengths were further enhanced. However, with continued increases in aluminum dihydrogen phosphate content, both dry and wet blank strengths began to decrease. This is because aluminum dihydrogen phosphate molecules contain highly polar PO and HO bonds, which enable the molecules to form strong hydrogen bonds with water molecules. Water molecules can then bind to the oxygen atoms of the aluminum dihydrogen phosphate molecules through these hydrogen bonds, thus being adsorbed onto the surface of the aluminum dihydrogen phosphate, resulting in strong hygroscopicity. Therefore, excessive aluminum dihydrogen phosphate content can actually degrade the stability of the three-dimensional network structure formed by the blank reinforcing agent, leading to a decrease in blank strength. With increasing phenolic resin content, the dry blank strength gradually increased, while the wet blank strength showed little difference. This is mainly because during the curing process, the phenolic resin undergoes a cross-linking reaction between molecules to form a network structure, further enhancing the interparticle adhesion. As the content of organic bentonite increases, the strength of the dry blank gradually increases. When organic bentonite is mixed with aluminum dihydrogen phosphate, a protective layer is formed on the surface of aluminum dihydrogen phosphate. This protective layer can prevent water molecules from penetrating, thereby reducing the hygroscopicity of aluminum dihydrogen phosphate and enhancing the stability of the three-dimensional network structure after it comes into contact with water.
[0049] Furthermore, when the raw material components of the body strengthening agent, by weight, include: 0.5-0.7 parts aluminum dihydrogen phosphate, 0.5-0.6 parts phenolic resin, and 0.2-0.3 parts organobentonite, the resulting ceramic green body exhibits better dry and wet strength. Optimally, when the raw material components of the body strengthening agent (unit: parts by weight) are: 0.6 parts aluminum dihydrogen phosphate, 0.6 parts phenolic resin, and 0.3 parts organobentonite, the dry and wet strength of the green body are optimal.
[0050] Example 3 A processing method for high-strength ceramic green bodies includes the following steps: S1. Ceramic raw materials are mixed with water and ball-milled to obtain ceramic slurry. Silica sol solution (30% alkaline) is added to the ceramic slurry and stirred evenly to obtain a mixed slurry. The amount of silica sol solution added accounts for 30 wt.% of the total dry powder mass of the ceramic slurry.
[0051] S2. After drying the mixed slurry obtained in step S1 for 20 minutes, grind it through a 30-mesh sieve. Mix the sieved powder with the green body reinforcing agent evenly and press it into a green body with a size of 80 mm × 40 mm and a thickness of 4-5 mm. The raw material components of the green body reinforcing agent include: 0.6 g of aluminum dihydrogen phosphate, 0.6 g of phenolic resin, and 0.3 g of organobentonite. The percentage of the green body reinforcing agent added to the total mass of the sieved powder is shown in Table 3.
[0052] S3. Dry the green body obtained in step S2 at 150°C for 70 min, and cool it to room temperature; apply methyl water to the surface of the green body, wherein the methyl water is prepared by dispersing 1 kg of sodium carboxymethyl cellulose in 6 kg of ethylene glycol, and then mixing and dissolving it with 100 kg of water. Let it stand for 2-3 min to obtain the high-strength ceramic green body.
[0053] The dry and wet strengths of the ceramic green bodies prepared in Example 3 were tested. The test results are shown in Table 3.
[0054] Table 3 As shown in Table 3, the strength of both dry and wet green bodies increases with the increase of the amount of green body reinforcing agent added. However, when the amount added exceeds 6 wt.%, the improvement in the strength of dry green bodies is not significant, and the strength of wet green bodies even decreases. Therefore, the improvement in the strength of both dry and wet green bodies is most significant when the amount of green body reinforcing agent added is 6 wt.%.
[0055] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. A processing technology for high-strength ceramic green bodies, characterized in that, Includes the following steps: S1. Mix ceramic raw materials with water and ball mill to obtain ceramic slurry. Add silica sol solution to ceramic slurry and stir evenly to obtain mixed slurry. S2. After drying the mixed slurry obtained in step S1, grind and sieve it, and press the sieved powder into a blank. S3. Dry the blank obtained in step S2 at 140~150℃ for 65~70 min, and then cool it to room temperature; Apply methyl water to the surface of the green body and let it stand for 2-3 minutes to obtain the high-strength ceramic green body.
2. The processing technology for a high-strength ceramic green body according to claim 1, characterized in that, Step S2 also includes adding a green body reinforcing agent to the sieved powder and mixing it evenly.
3. The processing technology for a high-strength ceramic green body according to claim 2, characterized in that, The raw material components of the green body reinforcing agent, by weight, include: 0.3-0.9 parts aluminum dihydrogen phosphate, 0.3-0.6 parts phenolic resin, 0-0.3 parts organobentonite, and 0-0.3 parts quartz powder.
4. The processing technology for a high-strength ceramic green body according to claim 2, characterized in that, The raw material components of the green body reinforcing agent, by weight, include: 0.5-0.7 parts aluminum dihydrogen phosphate, 0.5-0.6 parts phenolic resin, and 0.2-0.3 parts organobentonite.
5. The processing technology for a high-strength ceramic green body according to claim 1, characterized in that, The raw materials for the methyl water include sodium carboxymethyl cellulose, ethylene glycol, and water; wherein the mass ratio of sodium carboxymethyl cellulose: ethylene glycol: water is 0.8~1.2:5.5~6.5:95~105.
6. The processing technology for a high-strength ceramic green body according to claim 1, characterized in that, The amount of silica sol solution added is 10 wt.% to 50 wt.% of the total dry powder weight of the ceramic slurry.
7. The processing technology for a high-strength ceramic green body according to claim 1, characterized in that, The amount of silica sol solution added is 30 wt.% of the total dry powder weight of the ceramic slurry.
8. The processing technology for a high-strength ceramic green body according to claim 2, characterized in that, The amount of the green body reinforcing agent added is 2 to 10 wt. of the total weight of the powder after sieving.
9. The processing technology for a high-strength ceramic green body according to claim 2, characterized in that, The amount of the green body reinforcing agent added is 6 wt.% of the total weight of the powder after sieving.
10. The processing technology for a high-strength ceramic green body according to claim 1, characterized in that, The drying time for step S2 is 15-20 minutes.