High-performance carbon ceramic composite resistor and preparation method thereof

Abstract

The invention belongs to the technical field of electronic components, and discloses a high-performance carbon ceramic composite resistor and a preparation method thereof, and the method comprises the following steps: preparing a phenolic resin solution; preparing slurry; granulating and forming; and sintering and post-processing. Through synergistic improvement of the components, the proportion and the preparation method and composite modification of the carbon nanotubes and the phenolic resin, the microstructure of the carbon ceramic composite material is optimized, a micron-sized stacked amorphous foliated microstructure is constructed, the distribution and form of a carbon phase are optimized, and the carbon ceramic composite material is prepared. Meanwhile, the conductivity, the mechanical strength, the thermal stability and the energy tolerance of the carbon ceramic resistor are improved, the resistance temperature coefficient and the voltage resistance coefficient are reduced, and the high-temperature stability of a ceramic material and the conduction characteristic of a carbon material are fused, so that the carbon ceramic resistor can be widely applied to extreme working condition scenes such as high temperature, high pressure and high energy impact; and higher performance requirements of manufacturing products such as power equipment, lightning protection devices, high-energy physical experiment devices and the like can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic components, and in particular to a high-performance carbon ceramic composite resistor and a preparation method thereof. Background Art

[0002] Carbon-ceramic composite resistors, with their moderate electrical conductivity, good thermal stability, and sufficient mechanical strength, play an important role in various fields. However, existing carbon-ceramic resistors still have some shortcomings, such as complex preparation processes and poor product consistency; insufficient resistance stability under extreme temperature fluctuations; potential mechanical failure under high stress; limited energy tolerance; and a high resistance voltage coefficient, which affects circuit accuracy and stability.

[0003] Due to their crucial role in high-voltage electrical applications, the preparation of high-performance carbon ceramic composite resistors has become a research priority. However, factors such as raw material selection, preparation process, and process parameters all affect the overall performance of the final carbon ceramic composite resistor. In traditional preparation processes, which utilize solid carbon raw materials, the uniformity of carbon distribution is a major issue affecting the performance of carbon ceramic composite resistors. This uneven carbon distribution results in a high degree of resistance dispersion in the composite resistor. Furthermore, during high-current surge operations, the current is unevenly distributed within the resistor, leading to localized overheating and breakdown failure.

[0004] For example, CN116813313A discloses a carbon composite ceramic linear resistor and its preparation method, both of which fall within the field of power electronic components. The resistor is prepared using alumina, bentonite, carbon materials, and graphene sheets as raw materials through processes such as ball milling, green compact pressing, atmosphere-protected sintering, and silver spraying. CN119330713A, on the other hand, discloses a carbon nanotube-doped graphite ceramic resistor comprising a graphite ceramic matrix with uniformly dispersed carbon nanotubes within it. Both utilize graphene sheets as the conductive material, and the resistor's conductive network relies on the graphene sheets being in contact with each other. When the resistor expands due to heat, the graphene sheets can easily lose contact, resulting in unstable performance.

[0005] The preparation process can also significantly affect the performance of ceramic resistors. CN120089476A discloses a ceramic resistor containing a continuous conductive layer, its preparation method, and its application. The method first deposits a conductive material within a fiber mat support layer using vacuum impregnation and gas pressure sintering, and then deposits a ceramic material within the conductive layer-containing support layer using vacuum impregnation and gas pressure sintering. These structural layers are continuously connected to form a novel ceramic resistor. However, the conductive and ceramic materials prepared by this method must be fully infiltrated into the fiber mat, resulting in a long preparation time, low infiltration volume, and low strength of the ceramic resistor.

[0006] Additionally, existing carbon materials, such as carbon nanotubes and carbon black, are often used to reinforce ceramic-based composites due to their unique electrical and mechanical properties, improving their electrical resistance and other properties. However, the poor dispersion of carbon materials in the ceramic matrix limits the performance improvements of the composites.

[0007] In summary, existing carbon ceramic resistors have the following shortcomings: complex preparation process, poor product consistency, insufficient resistance stability under extreme temperature changes, possible damage to mechanical strength when subjected to large stress, limited energy tolerance, and high resistance voltage coefficient, which affects circuit accuracy and stability. It is also difficult to balance high-temperature stability and the conductive properties of carbon materials. They cannot be used in extreme working conditions such as high temperature, high pressure and high-energy impact, and cannot meet the high-performance requirements of application scenarios such as manufacturing power equipment, lightning protection devices, and high-energy physics experimental equipment. Summary of the Invention

[0008] In view of the shortcomings of the above-mentioned background technology, the purpose of the present invention is to provide a high-performance carbon ceramic composite resistor and a preparation method thereof. Through the coordinated improvement of components, proportions and preparation methods, a micron-level stacked amorphous blade-shaped microstructure is constructed, the distribution and morphology of the carbon phase are optimized, and the electrical conductivity, mechanical strength, thermal stability and energy tolerance of the carbon ceramic resistor are improved, and the resistance temperature coefficient and voltage resistance coefficient are reduced, so that it can be used in extreme working conditions such as high temperature, high pressure and high energy impact, and meet higher performance requirements such as power equipment manufacturing.

[0009] To achieve the above object, the present invention provides the following technical solutions: A method for preparing a high-performance carbon ceramic composite resistor comprises the following steps: Step A. Preparation of a phenolic resin solution: dissolving a phenolic resin in anhydrous ethanol to prepare a 20-60 wt% phenolic resin solution, adding 1-3.5 wt% of carbon nanotubes to the solution, and performing ultrasonic stirring for more than 1 hour; Step B. Slurry preparation: The phenolic resin solution obtained in step A is mixed with ceramic raw materials, graphite, a dispersant, a binder, and deionized water, and a uniform slurry is formed by ball milling; Step C. Granulation and Molding: The slurry obtained in Step B is granulated by centrifugal spraying to obtain a uniform powder. After water treatment and aging, it is pressed into a solid or hollow cylindrical body by dry pressing; Step D. Sintering and Post-Processing: The green body obtained in Step C is sintered and densified in a sealed atmosphere furnace, then cleaned by grinding, sprayed with aluminum electrodes to form a conductive layer, and then coated with an inorganic insulating layer and cured to complete the preparation; A high-performance carbon ceramic composite resistor is prepared by the method described. The high-performance carbon ceramic composite resistor comprises a carbon phase derived from a carbon nanotube-modified phenolic resin, a bauxite-kaolin-clinker ceramic phase, and a flake graphite conductive phase. The surface is sprayed with an aluminum electrode and covered with an inorganic insulating layer. The interior of the resistor is a micron-scale stacked amorphous blade-like microstructure with an energy tolerance of 400-750 J·cm -3 Its density is 2.2-2.7 g·cm -2 , flexural strength greater than 56 MPa, electrical conductivity of 0.01~10 S / cm, and temperature resistivity of 200~1500×10 -6 / ℃, the voltage resistance coefficient is -0.95~0.15% / kV / cm.

[0010] Compared with the prior art, the present invention has the following advantages and significant features: 1. The present invention enhances the modification effect of carbon ceramic resistors by synergistically improving components, proportions, and preparation methods, by introducing carbon nanotube-modified phenolic resin as an organic carbon source, constructing a micron-level stacked amorphous blade-like microstructure, optimizing the distribution and morphology of the carbon phase, and simultaneously improving the electrical conductivity, mechanical strength, thermal stability, and energy tolerance of the carbon ceramic resistors, while reducing the temperature coefficient of resistance and voltage resistivity. This resistor material combines the high-temperature stability of ceramic materials with the conductive properties of carbon materials, and can be widely used in extreme working conditions such as high temperature, high pressure, and high-energy impact, and can meet the higher performance requirements of the manufacturing of power equipment, lightning protection devices, high-energy physics experimental equipment, etc.

[0011] 2. The present invention uses carbon nanotubes to modify thermoplastic phenolic resin and uniformly disperses the carbon nanotubes in the phenolic resin to optimize the distribution and morphology of the carbon phase to improve the comprehensive performance of the carbon-ceramic composite resistor. During the sintering process, the carbon nanotubes are carbonized products of the phenolic resin and play a dual role in enhancing the structure and conductivity.

[0012] 3. The phenolic resin used in the present invention not only serves as a carbon source, but also as a binder in the slurry, and plays a bonding role between the green body powders in the subsequent C molding process, thereby ensuring the mechanical strength of the green body; the granulation and subsequent molding method used in the present invention can significantly increase the density of the material and construct a dense microstructure, thereby improving the conductivity and structural stability of the carbon ceramic resistor. 4. This invention optimizes the dispersion of carbon materials such as carbon nanotubes and carbon black in a ceramic matrix to enhance the performance of composite resistors. This involves dissolving a water-based phenolic resin in a solution, then evenly dispersing the carbon material in a slurry. The slurry is then granulated, molded, and sintered to improve the dispersion of the carbon material in the ceramic matrix, ultimately enhancing various properties of the composite resistor. This addresses the prior art issue of poor dispersion of carbon materials in the ceramic matrix, which limits the performance of composite resistors.

[0013] 4. Compared with CN116813313A, the present invention uses graphene sheets as the conductive material. The conductive network of the resistor sheet relies on the contact between the graphene sheets. When the resistor sheet expands due to heat, the graphene sheets easily lose contact with each other, resulting in unstable performance. The present invention uses liquid phenolic resin, which forms an integrated conductive carbon network after high-temperature carbonization, and the phenomenon of expanded flaky carbon losing contact will not occur.

[0014] 5. Compared with CN119330713A, the carbon nanotubes used in the present application are used as a supplementary conductive material for graphite, and rely on physical contact to improve the uniformity of conductivity. However, the problem of uniform dispersion of the conductive material still exists, and physical contact alone cannot achieve a stable conductive network. However, the present invention uses pulping, granulation, and molding processes to uniformly disperse carbon nanotubes and components such as carbides and graphite of phenolic resin, optimize the distribution and morphology of the carbon phase, and jointly construct a micron-level stacked stable conductive network structure, so as to simultaneously improve the electrical conductivity, mechanical strength, thermal stability and energy tolerance of the carbon ceramic resistor, and reduce the temperature coefficient of resistance and voltage resistivity.

[0015] 6. Compared with CN120089476A, the present invention uses vacuum impregnation and pressure sintering to deposit the conductive material within the fiber mat support layer, and then uses vacuum impregnation and pressure sintering to deposit the ceramic material within the conductive layer-containing support layer. These structural layers are continuously connected to form a novel ceramic resistor. This method requires the conductive and ceramic materials to penetrate the fiber mat, which takes a long time, results in a small penetration rate, and results in low ceramic resistor strength. The present invention uses granulation and compression molding, resulting in a resistor body with higher strength. After sintering, the resistor strength is higher, and the preparation speed is faster, with a simpler process.

[0016] The above is an overview of the technical solution of the invention. The present invention will be further described below in conjunction with specific implementation methods and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0018] Figure 1 This is an SEM image of the dispersion effect of carbon nanotubes in phenolic resin according to Example 1 of the present invention; Figure 2is a SEM image of the microstructure of the carbon ceramic resistor prepared in Example 1 of the present invention; Figure 3 This is an EDS diagram of the carbon distribution state of the carbon ceramic resistor in Example 1 of the present invention; Figure 4 This is an EDS diagram of the carbon distribution state of the carbon ceramic resistor in Example 2 of the present invention; Figure 5 This is the EDS diagram of the carbon distribution state of the carbon ceramic resistor in comparative example 1 of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly described, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Basic Example A method for preparing a high-performance carbon ceramic composite resistor comprises the following steps: Step A. Preparation of a phenolic resin solution: Phenolic resin is dissolved in anhydrous ethanol to prepare a 20-60 wt% phenolic resin solution. 1-3.5 wt% carbon nanotubes are added to the solution and ultrasonically stirred for at least one hour to uniformly disperse the carbon nanotubes in the phenolic resin solution. The carbon nanotubes also modify the phenolic resin solution. The carbon nanotubes are single-walled carbon nanotubes or multi-walled carbon nanotubes; Step B. Slurry Preparation: The phenolic resin solution obtained in Step A is mixed with ceramic raw materials, graphite, a dispersant, a binder, and deionized water, and ball milled to form a uniform slurry for 24-72 hours; The ceramic raw materials include bauxite, kaolin and clinker; The mass percentages of the raw materials for preparing the slurry are: phenolic resin solution 1-5%, bauxite 15-25%, kaolin 5-10%, clinker 15-25%, graphite 0-5%, dispersant 0.2-0.5%, binder 0.2-0.5%, and deionized water 35-55%; The phenolic resin in the phenolic resin solution in this step is a carbon source and a binder, and specifically thermoplastic phenolic resin can be selected; the dispersant is a hydroxy acid polymer, and the binder is polyvinyl alcohol; Step C. Granulation and Molding: The slurry obtained in Step B is granulated by centrifugal spraying to obtain a uniform powder. After water treatment and aging, it is pressed into a solid or hollow cylindrical body by dry pressing; The moisture content of the granulated material is 1-2% of the powder mass, and the aging time is 8-24 hours; The inner diameter of the dry-pressed cylindrical blank is 0-30mm, the outer diameter is 20-155mm, and the thickness is 10-40mm. The phenolic resin is used as a binder to firmly bond the powder materials of the blank to improve the strength of the cylindrical blank. Step D. Sintering and Post-Processing: The green body obtained in Step C is sintered and densified in a sealed atmosphere furnace, then cleaned by grinding, sprayed with aluminum electrodes to form a conductive layer, and then coated with an inorganic insulating layer and cured to complete the preparation; Among them, the maximum sintering temperature is 1200-1400℃, the holding time is 1-5 hours, and the sintering environment is a reducing atmosphere or an inert atmosphere; during the sintering process, the carbon nanotubes are evenly dispersed in the phenolic resin. The phenolic resin serves as a binder for other components, and its carbide serves as a carbon source. Together with other components, it constructs a micron-level stacked amorphous leaf-shaped microstructure to enhance structural strength and conductive properties.

[0021] A high-performance carbon-ceramic composite resistor, prepared by the aforementioned method, comprises a carbon phase derived from a carbon nanotube-modified phenolic resin, a bauxite-kaolin-clinker ceramic phase, and a flake graphite conductive phase. The surface is sprayed with an aluminum electrode and covered with an inorganic insulating layer. The interior of the resistor is a micron-scale stacked amorphous blade-like microstructure with an energy tolerance of 400-750 J·cm. -3 ; density is 2.2-2.7g·cm -2 , flexural strength greater than 56 MPa, electrical conductivity of 0.01~10 S / cm, and temperature resistivity of 200~1500×10 -6 / ℃, the voltage resistance coefficient is -0.95~0.15% / kV / cm.

[0022] The key point of this embodiment is that by introducing carbon nanotubes to modify phenolic resin and uniformly dispersing them in the slurry, the microstructure and overall performance of the composite material are significantly optimized. This not only improves the electrical conductivity of the carbon-ceramic composite resistor, but also significantly enhances its mechanical strength and thermal stability. Simultaneously, the temperature coefficient of resistance and voltage coefficient of resistance are effectively reduced, significantly improving energy tolerance. These improvements enable the high-performance carbon-ceramic composite resistor to better adapt to extreme operating environments such as high temperature, high pressure, and high-energy impact, meeting higher performance requirements in applications.

[0023] The following is combined with Figure 1-5 The raw materials used are all commercially available.

[0024] Example 1 The high-performance carbon-ceramic composite resistor and its preparation method provided in this embodiment are specific selections based on the above basic embodiments. The preparation method includes the following steps: Step A. Preparation of phenolic resin solution: Dissolve phenolic resin in anhydrous ethanol to prepare a 50 wt% phenolic resin solution; add 1.5 wt% carbon nanotubes (multi-walled carbon nanotubes) to the solution and perform ultrasonic stirring for 2 hours to ensure uniform dispersion of the carbon nanotubes and to modify the dissolution of the phenolic resin; the dispersion of carbon nanotubes in the phenolic resin is shown in the scanning electron microscopy morphology. Figure 1 ,It can be seen that the carbon nanotubes are evenly distributed in the phenolic resin; The phenolic resin selected in this embodiment is the commercially available BR2123 phenolic resin produced by Shanghai MacLean Biochemical Technology Co., Ltd.; Step B. Slurry Preparation: The phenolic resin solution, bauxite, kaolin, clinker, graphite, dispersant, binder, and deionized water were mixed and ball-milled for 48 hours to form a uniform slurry. The mass percentages of phenolic resin solution, bauxite, kaolin, clinker, graphite, dispersant, binder and deionized water for preparing the slurry are 2%, 20%, 7%, 20%, 2%, 0.3%, 0.4% and 48.3%; Step C. Granulation and Molding: The slurry is granulated using centrifugal spraying to obtain a uniform powder. The granules are then hydrated and aged. Subsequently, the powder is pressed into solid cylindrical bodies using a dry pressing process with an outer diameter of 48 mm and a thickness of 15 mm. The granules are hydrated to a moisture content of 1.5% of the powder mass and aged for 12 hours. Step D. Sintering and Post-Processing: The green body is sintered in a sealed atmosphere furnace to densify the material. After sintering, the sample is ground and cleaned, and an aluminum electrode is sprayed to form a conductive layer. Finally, an inorganic insulating layer is applied and cured to complete the resistor fabrication. The green body is sintered at a maximum temperature of 1350°C for 2 hours in a pure nitrogen inert atmosphere.

[0025] The high-performance carbon ceramic composite resistor prepared by the method of this embodiment comprises a carbon phase derived from a carbon nanotube-modified phenolic resin, a bauxite-kaolin-clinker ceramic phase, and a flake graphite conductive phase. The surface is sprayed with an aluminum electrode and covered with an inorganic insulating layer. The microstructure of the carbon ceramic resistor is observed by scanning electron microscopy. Figure 2 ,Depend on Figure 2 It can be seen that the interior is a micron-level stacked amorphous blade-like microstructure, forming a dense and stable conductive structure. The carbon distribution state of the carbon ceramic resistor is characterized by combining energy spectrum element analysis. The characterization results are shown in Figure 3 , it can be seen that the carbon element is evenly distributed inside the carbon ceramic resistor.

[0026] The performance test of the high performance carbon ceramic composite resistor of this embodiment was carried out, and its density was 2.4g·cm -2, flexural strength is 56MPa, conductivity is 0.25 S / cm, and temperature resistivity is 1232×10 -6 / ℃, voltage resistivity is -0.75% / kV / cm, energy tolerance is 520 J·cm -3 .

[0027] Example 2 The high-performance carbon ceramic composite resistor and its preparation method provided in this embodiment are substantially the same as those in Example 1, except that: In the step B, the mass percentages of phenolic resin solution, bauxite, kaolin, clinker, graphite, dispersant, binder and deionized water are: 3%, 20%, 7%, 20%, 1%, 0.3%, 0.4% and 48.3%.

[0028] In the step D, the maximum sintering temperature of the green body is 1300° C., the holding time is 3 hours, and the sintering environment is a pure nitrogen inert atmosphere.

[0029] The performance test of the high performance carbon ceramic composite resistor of this embodiment was carried out, and the carbon distribution state of the carbon ceramic resistor was characterized by scanning electron microscopy combined with energy spectrum element analysis. The characterization results are shown in FIG. Figure 4 It can be seen that the distribution of carbon elements is similar to that in Example 1, and carbon is evenly distributed inside the carbon ceramic resistor. The density of the prepared carbon ceramic resistor is 2.4 g·cm -2 , flexural strength is 63MPa, conductivity is 0.57 S / cm, and temperature resistivity is 863×10 -6 / ℃, voltage resistivity is -0.54% / kV / cm, energy tolerance is 630 J·cm -3 .

[0030] Example 3 The high-performance carbon ceramic composite resistor and its preparation method provided in this embodiment are substantially the same as those in Example 1 or Example 2, except that: In the step B, the mass percentages of phenolic resin solution, bauxite, kaolin, clinker, graphite, dispersant, binder and deionized water are: 4%, 20%, 7%, 20%, 0%, 0.3%, 0.4% and 48.3%.

[0031] In the step D, the maximum sintering temperature of the green body is 1400° C., the holding time is 2 hours, and the sintering environment is a pure nitrogen inert atmosphere.

[0032] The performance test of the high performance carbon ceramic composite resistor of this embodiment was carried out, and its density was 2.3g·cm -2 , flexural strength is 67MPa, conductivity is 1.67 S / cm, and temperature resistivity is 362×10-6 / ℃, voltage resistivity is -0.23% / kV / cm, energy tolerance is 610 J·cm -3 .

[0033] Comparative Example 1 The carbon ceramic composite resistor and its preparation method provided in this embodiment are basically the same as those in Example 1, except that: In step B, the mass percentages of phenolic resin solution, bauxite, kaolin, clinker, graphite, dispersant, binder and deionized water are: 0%, 20%, 7%, 20%, 4%, 0.3%, 0.4% and 48.3%, that is, no phenolic resin solution and carbon nanotubes are contained.

[0034] The performance of the prepared carbon ceramic composite resistor was tested, and the carbon distribution of the carbon ceramic resistor was characterized by scanning electron microscopy combined with energy spectrum element analysis. The characterization results are shown in Figure 5 It can be seen that the distribution of carbon elements is very different from that of Examples 1 and 2. The distribution of carbon in the carbon ceramic resistor is very uneven. The density of the prepared carbon ceramic resistor is 2.1g·cm -2 , flexural strength is 34MPa, conductivity is 0.13 S / cm, and temperature resistivity is 2298×10 -6 / ℃, voltage resistivity is -1.12% / kV / cm, energy tolerance is 340 J·cm -3 .

[0035] In summary, the preparation method and product of the high-performance carbon ceramic composite resistor provided by the above embodiments of the present invention focus on the modification of phenolic resin by introducing carbon nanotubes and then using them as an organic carbon source. The combination of the two with other components and preparation processes can significantly improve the comprehensive performance of carbon ceramic resistors. The high-performance carbon ceramic composite resistor prepared by the present invention optimizes the microstructure of the carbon ceramic composite material through the composite modification of carbon nanotubes and phenolic resin and the granulation and molding process. Compared with the carbon ceramic composite resistor prepared with pure graphite as the carbon source, the electrical conductivity is improved, the bending strength is increased, the thermal conductivity is improved, and the resistance temperature coefficient and voltage resistance coefficient are reduced, and the energy tolerance is significantly enhanced; so that the high-performance carbon ceramic composite resistor can be widely used in extreme working conditions such as high temperature, high pressure and high energy impact, and can meet the technical requirements of high-performance electronic components.

[0036] It should be noted that within the range of the material ratios and process parameters described in the present invention, specific values ​​can be selected at will, and the resulting materials can achieve the technical effects described in the present invention. Therefore, the present invention will not list them one by one.

[0037] The above description is only a partial embodiment of the present invention and is not intended to limit the scope of protection of the present invention; the scope of protection of the present invention is defined by the claims in the appended claims, and all equivalent changes and modifications made based on the invention are within the scope of protection of the patent of the present invention.

[0038] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for preparing a high-performance carbon ceramic composite resistor, characterized in that: The following steps are involved: Step A. Preparation of a phenolic resin solution: dissolving a phenolic resin in anhydrous ethanol to prepare a 20-60 wt% phenolic resin solution, adding 1-3.5 wt% of carbon nanotubes to the solution, and performing ultrasonic stirring for more than 1 hour; Step B. Slurry preparation: The phenolic resin solution obtained in step A is mixed with ceramic raw materials, graphite, a dispersant, a binder, and deionized water, and a uniform slurry is formed by ball milling; Step C. Granulation and Molding: The slurry obtained in Step B is granulated by centrifugal spraying to obtain a uniform powder. After water treatment and aging, it is pressed into a solid or hollow cylindrical body by dry pressing; Step D. Sintering and post-processing: The green body obtained in step C is sintered and densified in a sealed atmosphere furnace, and the preparation is completed after the grinding disc is cleaned, aluminum electrodes are sprayed to form a conductive layer, and an inorganic insulating layer is applied and cured.

2. The preparation method according to claim 1, wherein: The carbon nanotubes in step A are single-walled carbon nanotubes or multi-walled carbon nanotubes; In step A, carbon nanotubes are uniformly dispersed in the phenolic resin solution, and the phenolic resin solution is modified by the carbon nanotubes.

3. The preparation method according to claim 1, wherein: The ceramic raw materials for preparing the slurry in step B include bauxite, kaolin and clinker; The mass percentages of the raw materials for preparing the slurry are: phenolic resin solution 1-5%, bauxite 15-25%, kaolin 5-10%, clinker 15-25%, graphite 0-5%, dispersant 0.2-0.5%, binder 0.2-0.5%, and deionized water 35-55%; The phenolic resin in the phenolic resin solution is a carbon source and a binder.

4. The preparation method according to claim 1, wherein: The ball milling time in step B is 24-72 hours.

5. The preparation method according to claim 1, wherein: The moisture content of the granulated material in step C is 1-2% of the mass of the powder, and the aging time is 8-24 hours.

6. The preparation method according to claim 1, wherein: The inner diameter of the cylindrical green body formed by dry pressing in step C is 0-30 mm, the outer diameter is 20-155 mm, and the thickness is 10-40 mm. The phenolic resin is used as a binder to firmly bond the powder materials of the green body to improve the strength of the cylindrical green body.

7. The preparation method according to claim 1, wherein: The maximum sintering temperature in step D is 1200-1400°C, the holding time is 1-5 hours, and the sintering environment is a reducing atmosphere or an inert atmosphere. During the sintering process, the carbon nanotubes are uniformly dispersed in the phenolic resin. The phenolic resin serves as a binder for the other components, and its carbide serves as a carbon source. Together with the other components, they construct a micron-level stacked amorphous blade-like microstructure, enhancing the structural strength and conductive properties.

8. A high-performance carbon-ceramic composite resistor, characterized by: It is prepared by the method described in any one of claims 1-7. The high-performance carbon ceramic composite resistor contains a carbon phase derived from carbon nanotube-modified phenolic resin, a bauxite-kaolin-clinker ceramic phase and a flake graphite conductive phase, and the surface is sprayed with an aluminum electrode and covered with an inorganic insulating layer.

9. The high performance carbon ceramic composite resistor according to claim 8, characterized in that: Its interior is a micron-level stacked amorphous blade-like microstructure with an energy tolerance of 400~750 J·cm -3 .

10. The high performance carbon ceramic composite resistor according to claim 8, characterized in that: Its density is 2.2-2.7 g·cm -2 , flexural strength greater than 56 MPa, electrical conductivity of 0.01~10 S / cm, and temperature resistivity of 200~1500×10 -6 / ℃, the voltage resistance coefficient is -0.95~0.15% / kV / cm.

Images