A special ceramic material, its preparation method and application

Abstract

This invention discloses a special ceramic material, its preparation method, and its application, belonging to the field of special ceramic technology. The special ceramic material comprises the following raw materials in parts by weight: 40-50 parts potassium feldspar, 15-25 parts quartz, 10-20 parts clay, 8-15 parts modified silicon carbide whiskers, 5-10 parts boron oxide, 5-10 parts stabilizer, and 20-25 parts water. The modified silicon carbide whiskers are coated with a layer of phosphate crystals. The silicon carbide whiskers help the ceramic material resist corrosion, reduce crack propagation, and, in conjunction with boron oxide, improve the material's density, thereby enhancing its corrosion resistance and mechanical properties. Furthermore, the phosphate crystal coating on the surface of the modified silicon carbide whiskers improves their compatibility and dispersibility in the matrix, strengthens the interfacial bonding between the modified silicon carbide whiskers and the ceramic matrix, and also acts as a barrier to further improve the corrosion resistance of the ceramic material.

Description

Technical Field

[0001] This invention belongs to the field of special ceramics technology, specifically relating to a special ceramic material, its preparation method, and its application. Background Technology

[0002] Specialty ceramics are a general term for a new type of ceramics that differ from traditional ceramics such as daily-use ceramics, building ceramics, and sanitary ceramics. Specialty ceramics are primarily made from high-purity artificially synthesized inorganic compounds using modern materials science processes, resulting in ceramic materials with unique and superior properties. Leveraging the high-temperature resistance, wear resistance, and chemical stability of ceramics, they are applied in aerospace, automotive manufacturing, electronic equipment, medical equipment, and other fields with extremely high requirements for material performance.

[0003] However, traditional special ceramic materials still suffer from the inherent brittleness and insufficient toughness of ceramic materials, making them prone to fracture under impact or sudden temperature changes, thus limiting their application in certain engineering fields. Furthermore, although most ceramic materials possess good chemical inertness, they can still corrode when frequently exposed to harsh environments with high temperatures, high pressures, and chemical corrosiveness, especially when exposed to chloride ions or other corrosive media.

[0004] Therefore, it is of great significance to obtain a ceramic material that can remain stable under harsh conditions, is not easily damaged in low temperature or high stress environments, has good toughness, and exhibits excellent impact resistance and wear resistance. Summary of the Invention

[0005] The purpose of this invention is to provide a special ceramic material, its preparation method and application, in order to solve the problems of unstable corrosion resistance, insufficient toughness and other mechanical properties of ceramic materials in harsh environments.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a special ceramic material comprising the following raw materials in parts by weight:

[0008] Potassium feldspar 40-50 parts;

[0009] 15-25 parts of quartz;

[0010] 10-20 parts clay;

[0011] 8-15 parts of modified silicon carbide whiskers;

[0012] 5-10 parts of boron oxide;

[0013] Stabilizer 5-10 parts;

[0014] 20-25 parts water;

[0015] The modified silicon carbide whiskers are coated with a layer of phosphate crystals.

[0016] Preferably, the stabilizer includes one or more combinations of lanthanum oxide, calcium oxide, manganese oxide, zinc oxide, zirconium oxide, aluminum oxide, and magnesium oxide.

[0017] By adopting the above technical solution, and introducing new additives, including modified silicon carbide whiskers and boron oxide, into feldspar-based ceramic materials, the corrosion resistance and mechanical properties of the resulting special ceramic materials are enhanced. Specifically:

[0018] Silicon carbide whiskers possess excellent chemical stability. As a reinforcing phase in specialty ceramic materials, they can enhance the ceramic material's resistance to most acidic and alkaline chemicals. Furthermore, they can bond with the matrix material, optimizing the microstructure of the resulting specialty ceramic material. By utilizing crack deflection and crack bridging matrices, they reduce crack propagation paths, thereby improving the mechanical properties of the ceramic material and significantly reducing the likelihood of crack formation, thus enhancing its corrosion resistance. The formulation also includes boron oxide, which fills the voids between the crystals formed during the sintering process, making the material more compact. Working synergistically with the modified silicon carbide whiskers, it produces a synergistic effect, improving not only the mechanical properties but also the corrosion resistance of the material.

[0019] Furthermore, the silicon carbide whiskers of the present invention have undergone modification treatment, with a layer of phosphate crystals coated on the surface, which can enhance the chemical stability and corrosion resistance of the silicon carbide whiskers, providing an effective protective barrier for ceramic materials. Moreover, it strengthens the interfacial bonding between the modified silicon carbide whiskers and the ceramic matrix, improves the compactness of the internal structure of the obtained ceramic material, reduces porosity and the number of defects, thereby helping to disperse stress, further reducing the possibility of crack propagation, and improving the long-term stability and mechanical properties of the obtained special ceramic materials.

[0020] Preferably, the raw materials for the modified silicon carbide whiskers include silicon carbide whiskers and water-soluble phosphate in a mass ratio of 1:(0.2 to 0.3).

[0021] Preferably, the diameter of the silicon carbide whiskers is 450–550 nm and the length is 10–15 μm.

[0022] Preferably, the water-soluble phosphate includes one or more combinations of diammonium dihydrogen phosphate, disodium hydrogen phosphate, phosphoric acid, diammonium hydrogen phosphate, and sodium pyrophosphate.

[0023] Preferably, the modified silicon carbide whiskers are prepared according to the following steps:

[0024] Pretreatment: Silicon carbide whiskers are washed and dried to obtain pretreated silicon carbide whiskers;

[0025] Modification treatment: Water-soluble phosphate is added to deionized water to adjust the pH of the solution to 4-6, pretreated silicon carbide whiskers are added, and the solution is immersed at 30-40℃ for 15-20 hours. Finally, the modified silicon carbide whiskers are obtained by washing and heat treatment.

[0026] Preferably, the heat treatment temperature is 100–130°C and the heat treatment time is 5–6 hours.

[0027] Silicon carbide whiskers can improve the microstructure of ceramic matrices and enhance the corrosion resistance and mechanical properties of special ceramic materials. However, simply adding silicon carbide whiskers does not have a strong reinforcing effect on ceramics. This is because silicon carbide whiskers have high surface energy and are prone to agglomeration in the ceramic matrix. In order to maintain the structural characteristics of silicon carbide whiskers, the dispersibility cannot be improved by strengthening the ball milling process, resulting in the whiskers not being uniformly dispersed, local stress concentration, which reduces the overall performance and the bonding force between the whiskers and the matrix material also decreases. Furthermore, when the silicon carbide whisker content is high, the "bridging" effect between whiskers will result in more free silicon in the matrix material, which will limit the mechanical properties of the material.

[0028] By employing the above technical solution, silicon carbide whiskers are modified. Specifically, a pretreatment process is first used to remove impurities and contaminants from the surface of the silicon carbide whiskers, reducing their impact on phosphate crystallization. Further, the pretreated silicon carbide whiskers are immersed in an aqueous solution of phosphate. Phosphate ions in the solution preferentially adsorb onto the active sites on the surface of the silicon carbide whiskers and can establish a strong bond with the silicon carbide substrate through chemical bonds. Finally, after heat treatment, a layer of phosphate crystals forms on the surface of the silicon carbide whiskers. The phosphate crystals exhibit high chemical stability and can act as a barrier, further improving the corrosion resistance of special ceramic materials and effectively preventing the erosion of corrosive media.

[0029] Furthermore, the phosphate coating significantly improves the surface properties of silicon carbide whiskers, enhances the wettability between the whiskers and the matrix, and improves the compatibility and dispersibility of the modified silicon carbide whiskers within the matrix. This facilitates uniform dispersion during mixing and sintering, while preserving the unique structural characteristics of the silicon carbide whiskers. It also reduces stress concentration and voids caused by aggregation, improving structural density and enhancing the mechanical properties of the special ceramic material. Moreover, phosphate helps fill the pores within the ceramic material's internal structure, increasing the residual density and thus improving overall mechanical properties.

[0030] The phosphate layer acts as a barrier, resisting the erosion of external corrosive media and maintaining the excellent properties of silicon carbide whiskers. It also protects the silicon carbide whiskers from releasing excess free silicon, greatly reducing the adverse effects of free silicon on ceramic materials. The resulting special ceramic materials have excellent corrosion resistance and mechanical properties.

[0031] Preferably, the raw materials for special ceramic materials also include 0.5 to 1.5 parts of phosphoserine.

[0032] By adopting the above technical solutions, modified silicon carbide whiskers can significantly improve the mechanical properties and corrosion resistance of the obtained special ceramic materials. The introduction of phosphate crystal layers can help improve the dispersibility and stability of silicon carbide whiskers. However, the introduction of phosphate crystal layers will introduce new crystalline phases on the basis of the original ceramic matrix, which will reduce the size of the grains or cause changes in the morphology of the grains in the special ceramic materials during sintering, thereby affecting the mechanical properties of the special ceramic materials.

[0033] Therefore, the raw materials of the present invention can also contain phosphoserine. Phosphoserine, as a phosphorus-containing organic compound, can be adsorbed at newly formed grain boundaries in the early stage of ball milling and sintering by binding with surface active sites in the matrix. This changes the energy state of the grain boundaries, inhibits abnormal grain growth, helps maintain uniform grain growth, promotes fine grain strengthening effect, and thus improves the mechanical properties of the obtained special ceramic materials.

[0034] Furthermore, phosphoseserine can participate in the formation of complex networks and composite phases between ceramic matrices, optimize the microstructure of ceramic materials, fill grain boundary regions, reduce internal porosity, and help obtain special ceramic materials with dense structure, strong impermeability, corrosion resistance and high toughness.

[0035] Secondly, the present invention provides a method for preparing special ceramics, comprising the following process steps:

[0036] S1. Weigh the raw materials of special ceramic materials according to the corresponding mass proportions, mix them, and then perform wet ball milling to obtain a premix;

[0037] S2. The premix is ​​sieved and then sintered at high temperature of 1300-1500℃ for 1-2 hours under vacuum conditions. After cooling, a special ceramic material is obtained.

[0038] More preferably, the wet ball milling time is 15–20 hours.

[0039] More preferably, the premix is ​​sieved twice, first through a 400-mesh sieve and then through a 120-mesh sieve.

[0040] More preferably, in step S1, the technical problem to be solved by the present invention can be solved without adding phosphoserine, and the desired technical effect can be obtained.

[0041] Thirdly, the present invention provides an application of a special ceramic material, which can be used in any of the following: capacitors, packaging materials for microelectronic devices, carriers for exhaust gas catalytic devices, reactor linings, and pump and valve components.

[0042] The beneficial effects of this invention are:

[0043] 1. The special ceramic material obtained by this invention incorporates two reinforcing phases: modified silicon carbide whiskers and boron oxide. The silicon carbide whiskers help the ceramic material resist corrosion and reduce crack propagation. Simultaneously, they work synergistically with boron oxide to improve the density of the obtained special ceramic material, thereby enhancing its corrosion resistance and mechanical properties. Furthermore, the modified silicon carbide whiskers of this invention are coated with a layer of phosphate crystals, which improves the compatibility and dispersibility of the modified silicon carbide whiskers in the matrix, strengthens the interfacial bonding between the modified silicon carbide whiskers and the ceramic matrix, and can also act as a barrier to further improve the corrosion resistance of the ceramic material.

[0044] 2. The raw materials for the special ceramic materials of this invention also include phosphoseserine, which can optimize the crystallization process of special ceramics, inhibit abnormal grain growth, and help form a fine and uniform grain structure, thereby improving the mechanical properties of the special ceramic materials. Furthermore, it can improve the microstructure of the ceramic matrix, reduce internal porosity, and obtain a dense special ceramic material with excellent corrosion resistance and mechanical properties. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] Preparation Example

[0047] Preparation Example 1: A modified silicon carbide whisker was prepared according to the following method:

[0048] Take 10g of silicon carbide whiskers (average diameter 500nm, average length 12μm), wash them alternately with anhydrous ethanol and deionized water, and then dry them at 60℃ to obtain pretreated silicon carbide whiskers.

[0049] Add 2.5g of ammonium dihydrogen phosphate to deionized water to prepare a phosphate aqueous solution with a mass fraction of 35%. Adjust the pH of the solution to 5, add 10g of pretreated silicon carbide whiskers, soak at 35℃ for 20h, then filter, wash three times with deionized water, and heat treat at 120℃ for 5h to obtain modified silicon carbide whiskers.

[0050] Preparation Example 2, a modified silicon carbide whisker, differs from Preparation Example 1 only in that the amount of ammonium dihydrogen phosphate added is 2g.

[0051] Preparation Example 3, a modified silicon carbide whisker, differs from Preparation Example 1 only in that the amount of ammonium dihydrogen phosphate added is 3g.

[0052] Preparation Example 4, a modified silicon carbide whisker, differs from Preparation Example 1 only in that the amount of ammonium dihydrogen phosphate added is 1g.

[0053] Preparation Example 5, a modified silicon carbide whisker, differs from Preparation Example 1 only in that the amount of ammonium dihydrogen phosphate added is 4g.

[0054] Example

[0055] Example 1: A special ceramic material was prepared according to the following process steps:

[0056] S1. Weigh 45 parts by mass of potassium feldspar, 20 parts by mass of quartz, 15 parts by mass of clay, 12 parts by mass of modified silicon carbide whiskers prepared in Preparation Example 1, 6 parts by mass of boron oxide, 8 parts by mass of zinc oxide and 23 parts by mass of water, mix them evenly and then perform wet ball milling to obtain a premix, wherein the wet ball milling speed is 50 r / min and the time is 15 h;

[0057] S2. The premix obtained above is first passed through a 400-mesh sieve, then through a 120-mesh sieve. The resulting mixture is sintered at 1350°C for 1.5 hours under vacuum conditions. After cooling, a special ceramic material is obtained.

[0058] Examples 2 and 3 describe a special ceramic material, differing from Example 1 only in that the raw material ratio of the special ceramic material was adjusted, as shown in Table 1:

[0059] Table 1. Formulation of Special Ceramic Materials for Examples 1 to 3

[0060] Example 1 Example 2 Example 3 Potassium feldspar / part 45 40 50 Quartz / portion 20 25 15 clay / part 15 10 20 Modified silicon carbide whiskers / part 12 8 15 Boron oxide / part 6 10 5 Zinc oxide / part 8 5 10 Water / part 23 20 25

[0061] In Examples 2 and 3, the modified silicon carbide whiskers prepared in Example 1 were used.

[0062] Example 4, a special ceramic material, differs from Example 1 only in that the modified silicon carbide whiskers prepared in Example 1 are replaced with an equal amount of the modified silicon carbide whiskers prepared in Example 2.

[0063] Example 5, a special ceramic material, differs from Example 1 only in that the modified silicon carbide whiskers prepared in Example 1 are replaced with an equal amount of the modified silicon carbide whiskers prepared in Example 3.

[0064] Example 6, a special ceramic material, differs from Example 1 only in that the modified silicon carbide whiskers prepared in Example 1 are replaced with an equal amount of the modified silicon carbide whiskers prepared in Example 4.

[0065] Example 7, a special ceramic material, differs from Example 1 only in that the modified silicon carbide whiskers prepared in Example 1 are replaced with an equal amount of the modified silicon carbide whiskers prepared in Example 5.

[0066] Example 8: A special ceramic material was prepared according to the following process steps:

[0067] S1. Weigh out 45 parts by mass of potassium feldspar, 20 parts by mass of quartz, 15 parts by mass of clay, 12 parts by mass of modified silicon carbide whiskers prepared in Preparation Example 1, 6 parts by mass of boron oxide, 8 parts by mass of zinc oxide, 1 part by mass of phosphoserine and 23 parts by mass of water, mix them evenly and then perform wet ball milling to obtain a premix, wherein the wet ball milling speed is 50 r / min and the time is 15 h;

[0068] S2. The premix obtained above is first passed through a 400-mesh sieve, then through a 120-mesh sieve. The resulting mixture is sintered at 1350°C for 1.5 hours under vacuum conditions. After cooling, a special ceramic material is obtained.

[0069] Example 9, a special ceramic material, differs from Example 8 only in that the amount of phosphoserine added is 0.5 parts.

[0070] Example 10, a special ceramic material, differs from Example 8 only in that the amount of phosphoserine added is 1.5 parts.

[0071] Example 11, a special ceramic material, differs from Example 8 only in that the amount of phosphoserine added is 2 parts.

[0072] Comparative Example

[0073] Comparative Example 1, a special ceramic material, differs from Example 1 only in that the amount of modified silicon carbide whiskers added in Example 1 is 5 parts.

[0074] Comparative Example 2, a special ceramic material, differs from Example 1 only in that the amount of modified silicon carbide whiskers added in Preparation Example 1 is 20 parts.

[0075] Comparative Example 3 is a special ceramic material, which differs from Example 1 only in that an equal amount of silicon carbide whiskers (average diameter of 500 nm and average length of 12 μm) are used to replace the modified silicon carbide whiskers prepared in Example 1.

[0076] Comparative Example 4 is a special ceramic material, which differs from Example 1 only in that the modified silicon carbide whiskers prepared in Example 1 are not added.

[0077] Comparative Example 5 is a special ceramic material that differs from Example 1 only in that it does not contain boron oxide.

[0078] Performance testing

[0079] 1. Mechanical property testing: According to the relevant records in GB / T 14389-93 "Test Method for Impact Toughness of Engineering Ceramics", the impact toughness (KJ / m) of the special ceramic materials obtained in the examples and comparative examples was tested. 2 Test;

[0080] 2. Corrosion resistance test: The special ceramic materials obtained in the examples and comparative examples were completely immersed in seawater, and the mass loss rate of the ceramic materials before and after 90 days was tested.

[0081] The results of the above experiments are shown in Table 2:

[0082] Table 2 Performance Test Results

[0083]

[0084] According to Table 2, and in conjunction with Examples 1, 6, 7, and Comparative Example 3, it can be seen that the impact toughness of Examples 6, 7, and Comparative Example 3 decreased, while the mass loss rate increased, with the change being more pronounced in Comparative Example 3. This is because Examples 6, 7, and Comparative Example 3 mainly adjusted the amount of phosphate added during the preparation of modified silicon carbide whiskers. In Example 6, the amount of water-soluble phosphate added was reduced, resulting in a corresponding decrease in phosphate crystallization on the surface of the modified silicon carbide whiskers. This weakened the barrier effect, reduced the dispersibility of the silicon carbide whiskers, and decreased the bonding force between them and the ceramic matrix. Consequently, the corrosion resistance and mechanical properties of the resulting special ceramic material decreased. In Comparative Example 3, the silicon carbide whiskers were not subjected to phosphate crystallization coating modification treatment, hence the performance degradation of the special ceramic material was more significant. In Example 7, the addition of water-soluble phosphates led to the formation of excessive phosphate crystals on the surface of silicon carbide whiskers. This weakened the bond strength between the silicon carbide whiskers and the ceramic matrix. Furthermore, the excessive phosphate crystals reduced the chemical stability of the silicon carbide whiskers themselves, which was detrimental to improving corrosion resistance.

[0085] Based on Examples 1, 8 through 11, it can be seen that Example 8 shows an increase in impact toughness and a decrease in mass loss rate compared to Example 1. Examples 9 and 10 show no significant changes in impact toughness and mass loss rate compared to Example 8. Example 11 shows a decrease in impact toughness and an increase in mass loss rate compared to Example 8. This is because the special ceramic material in Example 8 contains an amount of phosphoserine. The addition of phosphoserine effectively improves the grain variation and uneven growth problems caused by the addition of modified silicon carbide whiskers, helping to optimize the microstructure of the ceramic material, reduce internal porosity, and thus increase the density of the material, resulting in a ceramic material with enhanced mechanical properties and corrosion resistance. The difference between Examples 9 and 10 and Example 8 is only that the amount of phosphoserine added was adjusted within the required range, indicating that changing the amount of phosphoserine added within the required range has no significant impact on the performance of the obtained special ceramic material. In contrast to Example 8, Example 11 added an excessive amount of phosphoserine. Phosphoserine contains a large number of polar groups, including amino and carboxyl functional groups, which are prone to unnecessary side reactions with other components of the ceramic matrix during high-temperature sintering. This can affect the overall chemical stability and the mechanical properties of the obtained ceramic material. Moreover, during processing, an excessive amount of phosphoserine will increase the viscosity of the obtained premix, making subsequent molding processes difficult.

[0086] Based on Examples 1, 2, and 4, it can be seen that the impact toughness of Examples 1, 2, and 4 decreased and the mass loss rate increased compared to Example 1. This is because the amount of modified silicon carbide whiskers added was adjusted in Examples 1, 2, and 4. In Example 1, the amount of modified silicon carbide whiskers was reduced. A decrease in the modified silicon carbide whisker content reduces the enhancement effect on the corrosion resistance of the ceramic matrix and the optimization effect on the crack propagation path within the ceramic material. This increases the likelihood of crack formation in the ceramic, making it easier for corrosive media to erode the internal structure of the ceramic. Furthermore, the synergistic effect with boron oxide decreases, resulting in a decline in both the mechanical properties and corrosion resistance of the final special ceramic material. In Example 4, where no modified silicon carbide whiskers were added, the decrease in the mechanical properties and corrosion resistance of the material was even more pronounced. In Comparative Example 2, an excessive amount of modified silicon carbide whiskers was added. The excessive whisker structure can cause stress concentration, making the resulting special ceramic material more prone to cracking and propagation under external loads, thus leading to a decrease in the mechanical properties of the material. Moreover, the addition of excessive silicon carbide whiskers can also affect the thermal stability of the ceramic material. Since silicon carbide whiskers themselves have high thermal conductivity and can accelerate heat transfer, when the whisker content is excessive, the heat transfer becomes uneven, which not only affects the thermal stability of the ceramic material but also easily generates internal stress that is difficult to resolve, forming pores at the grain boundaries, resulting in a decrease in performance.

[0087] Combining Example 1 and Comparative Example 5, it can be seen that the impact toughness of Comparative Example 5 is lower than that of Example 1, while the mass loss rate is higher. This is because Comparative Example 5 does not contain boron oxide, which cannot help fill the pores between the crystals inside the ceramic material, resulting in a decrease in the density of the special ceramic material. Furthermore, the lack of boron oxide increases the stress buildup inside the material caused by temperature changes, which is detrimental to improving the material's mechanical properties and corrosion resistance.

[0088] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0089] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A special ceramic material, characterized in that, The raw materials include the following parts by weight: Potassium feldspar 40-50 parts; 15-25 parts of quartz; 10-20 parts clay; 8-15 parts of modified silicon carbide whiskers; 5-10 parts of boron oxide; Stabilizer 5-10 parts; 20-25 parts water; The modified silicon carbide whiskers are silicon carbide whiskers with a layer of phosphate crystals coated on their surface.

2. The special ceramic material according to claim 1, characterized in that, The raw materials for the modified silicon carbide whiskers include silicon carbide whiskers and water-soluble phosphates in a mass ratio of 1:(0.2-0.3).

3. The special ceramic material according to claim 2, characterized in that, The silicon carbide whiskers have a diameter of 450–550 nm and a length of 10–15 μm.

4. The special ceramic material according to claim 2, characterized in that, The water-soluble phosphates include one or more combinations of ammonium dihydrogen phosphate, disodium hydrogen phosphate, diammonium hydrogen phosphate, and sodium pyrophosphate.

5. The special ceramic material according to claim 2, characterized in that, The modified silicon carbide whiskers were prepared according to the following steps: Pretreatment: Silicon carbide whiskers are washed and dried to obtain pretreated silicon carbide whiskers; Modification treatment: Water-soluble phosphate is added to deionized water to adjust the pH of the solution to 4-6, pretreated silicon carbide whiskers are added, and the solution is immersed at 30-40℃ for 15-20 hours. Finally, the modified silicon carbide whiskers are obtained by washing and heat treatment.

6. The special ceramic material according to claim 5, characterized in that, The heat treatment temperature is 100–130°C, and the heat treatment time is 5–6 hours.

7. The special ceramic material according to claim 1, characterized in that, The raw materials for the special ceramic material also include 0.5 to 1.5 parts of phosphoserine.

8. The special ceramic material according to claim 1, characterized in that, The stabilizer includes one or more of lanthanum oxide, calcium oxide, manganese oxide, zinc oxide, zirconium oxide, aluminum oxide, and magnesium oxide.

9. A method for preparing a special ceramic material according to any one of claims 1 to 8, characterized in that, The process includes the following steps: S1. Weigh the raw materials of special ceramic materials according to the corresponding mass proportions, mix them, and then perform wet ball milling to obtain a premix; S2. The premix is ​​sieved and then sintered at high temperature of 1300-1500℃ for 1-2 hours under vacuum conditions. After cooling, a special ceramic material is obtained.

10. An application of a special ceramic material according to any one of claims 1 to 8, characterized in that, The special ceramic material can be used in any of the following applications: reactor lining, pump and valve components.

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