A TiN-Al2O3 composite material and its preparation method

Abstract

This invention relates to a TiN-Al2O3 composite material and its preparation method, belonging to the field of high-temperature materials technology. The TiN-Al2O3 composite material comprises the following components by mass percentage: 53%–95% Al2O3, 3%–45% TiN, with the remainder being impurities. Titanium corundum (Ti2O3-Al2O3) raw material is crushed and weighed with carbon powder at a mass percentage ratio of Ti2O3:C = (4.0–6.0):1.0, with 0.5–5% binder added. After uniform mixing, the mixture is pressed into pellets. The pellets are placed in a graphite crucible and heated in a medium-frequency furnace using nitrogen gas and electromagnetic induction for 10–60 minutes at a temperature of 1400–2000℃. This invention utilizes electromagnetic induction to first heat a graphite crucible. When the temperature reaches ≥1400℃, the pellets in contact with the graphite crucible undergo a reduction nitridation reaction, generating a TiN-Al2O3 composite material. TiN has good electrical conductivity; further heating of the newly formed TiN using electromagnetic induction promotes the reduction nitridation reaction of the internal pellets, resulting in TiN being generated layer by layer until the reaction is complete. This invention offers a simple preparation method, a short process flow, high efficiency, abundant raw materials, and excellent cost-effectiveness.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature materials technology, specifically relating to a TiN-Al2O3 composite material and its preparation method. Background Technology

[0002] Refractory materials are the foundation and supporting materials of high-temperature industries, and must be continuously developed and updated along with the advancement of high-temperature technologies to meet the increasingly stringent performance requirements of these industries. Therefore, independently innovating and developing high-quality refractory raw materials and new products with excellent high-temperature performance, good quality stability, good performance, economic benefits, and compliance with green development principles has always been a crucial goal for those working in the refractory materials industry.

[0003] Traditional refractory materials, developed based on inorganic mineral resources, are primarily oxides, such as alumina, magnesia, and zirconium oxide, and are currently the most widely used refractory material systems. Oxide refractories possess advantages such as high strength, high hardness, oxidation resistance, wear resistance, and high-temperature resistance. Through long-term development, the performance of oxide products has been greatly improved. However, traditional oxide refractories are inherently brittle and have poor thermal shock resistance, making them prone to structural spalling during high-temperature structural applications. This weakness significantly limits their application range.

[0004] With the development of rocket technology, nuclear power plants, and modern metallurgy, non-oxide refractory materials have rapidly advanced, such as Si3N4, SiC, SiAlON, and TiN. Compared with traditional oxide refractory materials, non-oxide refractory materials typically have higher melting points, superior high-temperature performance, mechanical properties, chemical stability, excellent erosion resistance, good thermal conductivity, and excellent thermal shock resistance. Combining non-oxide raw materials with traditional oxide raw materials to prepare novel non-oxide-oxide composite refractory materials can leverage the advantages of both while compensating for their respective shortcomings. Compared with traditional single oxide refractory materials, non-oxide-oxide composite refractory materials exhibit superior erosion resistance and thermal shock resistance, and are suitable for smelting high-quality steels such as clean steel and ultra-low carbon steel, making them a promising new generation of composite refractory materials.

[0005] However, current non-oxide-oxide composite refractory materials mainly employ macro-scale composite methods, that is, using refractory oxides and non-oxides as raw materials and mixing them uniformly on a macro-scale to obtain non-oxide-oxide composite materials. Macro-scale composites of oxides and non-oxides cannot fully utilize the advantages of both; therefore, the artificial synthesis of dense non-oxide-oxide composite refractory raw materials is of great significance. Currently, there are no reports on the artificial synthesis of non-oxide-oxide composite refractory raw materials.

[0006] Chinese patent ZL 202011113734.2, "A Titanium Nitride-Coated Ti2O3 Composite Al2O3 Material and Its Preparation Method," proposes using the slag from the reduction of rutile concentrate with metallic aluminum as raw material. After crushing, the slag is nitrided and sintered in a high-temperature kiln at 800-1800℃ to prepare a titanium nitride-coated Ti2O3 composite Al2O3 material. The particles have a Ti2O3-Al2O3 composite material inside and a TiN coating on the particle surface. However, due to the limitation of the upper limit of the high-temperature kiln sintering temperature (≤1700℃), only a thin TiN layer is formed on the particle surface of the Ti2O3-Al2O3 composite material, while the inside of the particles remains in oxide form. The preparation of a uniform and dense TiN-Al2O3 refractory material is not achieved.

[0007] TiN has a high melting point, high hardness, good thermal conductivity, is not easily wetted by molten metals and slag, and exhibits excellent chemical stability. It is a non-oxide refractory material with high corrosion resistance and high thermal shock resistance. Practical studies have shown that TiN deposition in the hearth and bottom of blast furnaces can effectively prevent the erosion of the hearth lining by molten iron and slag, thus extending the service life of the blast furnace. Summary of the Invention

[0008] To overcome the bottlenecks in existing technologies, such as the difficulty in preparing uniform TiN-Al2O3 composite refractory raw materials, and considering the good electrical conductivity of TiN, which enables electromagnetic induction heating, this invention proposes a method for preparing TiN-Al2O3 composite refractory raw materials through electromagnetic induction heating sintering in a medium-frequency furnace. TiN-Al2O3 composite refractory raw materials are expected to have wide applications in high-temperature industries, especially in blast furnace linings, cement kilns, and functional refractory materials for steelmaking.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] A TiN-Al2O3 composite material comprises the following components by mass percentage: 53%–95% Al2O3, 3%–45% TiN, and the remainder being impurities such as Si, Mg, and C.

[0011] Furthermore, the raw materials for preparing the TiN-Al2O3 composite material are titanium corundum and carbon powder, and the binder is phenolic resin; the particle size of the titanium corundum is ≤5mm, and the particle size of the carbon powder is ≤0.2mm.

[0012] Furthermore, the main phase composition of the titanium corundum raw material is Al2O3 and Ti2O3, with the balance being acceptable impurities. The titanium corundum raw material contains 3-50% Ti2O3 by mass percentage; the carbon powder includes, but is not limited to, carbon black, graphite, and carbon nanotubes.

[0013] Furthermore, the mass ratio of titanium corundum to carbon powder is Ti2O3:C = (4.0~6.0):1.0; the amount of binder added is 0.5~5% of the total mass of titanium corundum and carbon powder. The carbon powder mainly acts as a reducing agent to reduce the Ti2O3 phase in the titanium corundum. Therefore, based on the stoichiometric ratio in Ti2O3 + 3C + N2 = 2TiN + 3CO, the mass ratio of titanium corundum to carbon varies depending on the Ti2O3 content in the titanium corundum.

[0014] The preparation method of the TiN-Al2O3 composite material is as follows: titanium corundum and carbon powder are weighed in proportion, phenolic resin binder is added, and after being mixed evenly, they are pressed into pellets; the pellets are placed in a graphite crucible and sintered by electromagnetic induction heating in a medium frequency furnace under a nitrogen atmosphere.

[0015] The preparation method of the TiN-Al2O3 composite material as described above includes the following steps:

[0016] (1) Weigh the titanium corundum, carbon powder and binder according to the ratio, stir evenly and press into balls;

[0017] (2) Place the pellets from step (1) into a graphite crucible, introduce flowing nitrogen into a medium frequency furnace, and sinter by electromagnetic induction heating with electricity. After the reaction is complete, the finished product is obtained.

[0018] Further, in step (1), titanium corundum and carbon powder are first premixed to obtain a mixed powder, and then the mixed powder is stirred with the binder phenolic resin until it is evenly mixed.

[0019] Furthermore, the control parameters for electromagnetic induction heating sintering in step (2) are: N2 content in nitrogen atmosphere ≥ 99.5%, electromagnetic induction frequency ≥ 1000 Hz, sintering temperature 1400~2000℃, and sintering time 10~60 min.

[0020] The present invention also provides a TiN-Al2O3 composite refractory material, which is obtained by the preparation method of the present invention and has excellent high-temperature strength, thermal shock resistance and erosion resistance.

[0021] Beneficial Effects: This invention addresses the problems of high cost of non-oxide refractory raw materials and difficulty in preparing non-oxide-oxide composite refractory materials in existing technologies. It selects titanium corundum, a byproduct of aluminothermic reduction of ilmenite to prepare ferro-titanium alloys, as raw material, uses carbon as a reducing agent, and employs medium-frequency furnace electromagnetic induction heating technology to achieve high-efficiency synthesis and densification of TiN-Al2O3 composite refractory materials. Details are as follows:

[0022] (1) Using titanium corundum, a byproduct of aluminothermic reduction of ilmenite to prepare ilmenite alloys, as raw material, a high-performance TiN-Al2O3 composite refractory material was prepared. The raw material cost was low, realizing the high added value utilization of ilmenite slag and greatly alleviating the environmental problems caused by the accumulation of waste ilmenite slag.

[0023] (2) Using a graphite crucible as both a container and a heating element, electromagnetic induction is used to first heat the graphite crucible. This heats the outer pellets through heat conduction and radiation, initiating a carbothermic reduction-nitridation reaction of Ti₂O₃ to generate TiN. TiN possesses excellent electrical conductivity. Under the influence of the electromagnetic induction coil, the newly generated TiN on the outer layer forms a new heating element, increasing the heat for the inner pellets and promoting their carbothermic reduction-nitridation reaction. The newly generated TiN then forms another heating element, promoting the reaction gradient to advance layer by layer inwards until the reaction is complete. By fully utilizing the electrical conductivity of TiN and employing electromagnetic induction heating, reaction efficiency can be greatly improved, and energy consumption in the production process can be reduced.

[0024] (3) Under the action of electromagnetic induction coil, eddy currents are generated inside the TiN-Al2O3 composite material, forming self-heating, and the temperature can reach 2000℃ and above. Through electromagnetic induction heating and heat preservation, the densification sintering of TiN-Al2O3 composite material can be further realized. After crushing, high density TiN-Al2O3 composite material can be obtained.

[0025] (4) TiN has a high melting point, high hardness, and good thermal conductivity. It is not easily wetted by molten metals and slags, and has excellent chemical stability. When combined with Al2O3, it can greatly improve the material's resistance to erosion, thermal shock, and high-temperature strength. High-density TiN-Al2O3 composite materials can be used as special refractory raw materials, breaking through the synthesis technology of high-performance, dense non-oxide-oxide composite refractory raw materials.

[0026] (5) The TiN-Al2O3 composite material of the present invention has high strength, good chemical stability, excellent thermal shock resistance, excellent erosion resistance, and excellent high-temperature creep performance;

[0027] (6) The raw materials of this invention are abundant and cost-effective. The preparation method is simple, the process is short, the energy consumption is low, the production efficiency is high, it is suitable for industrial production, and the qualification rate is high. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1This is a flowchart of the preparation method of the present invention;

[0030] Figure 2 These are microscopic morphology images of titanium corundum raw materials with different Ti2O3 contents used in this invention.

[0031] Figure 3 Industrial CT scans of titanium corundum raw materials with different Ti2O3 contents used in this invention;

[0032] Figure 4 The image shows the macroscopic morphology of the TiN-Al2O3 composite material raw material prepared in Example 5.

[0033] Figure 5 XRD pattern of the composite material prepared in Example 5;

[0034] Figure 6 The XRD pattern of the composite material prepared for Comparative Example 1. Detailed Implementation

[0035] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be described in detail below with reference to specific embodiments. It should be understood that the embodiments described in this specification are merely illustrative and not intended to limit the scope of the invention.

[0036] Example 1

[0037] The raw materials, ilmenite and aluminum powder, are divided into several batches. The first batch of materials is added to a reactor, and magnesium powder is ignited from the top of the materials to initiate a self-propagating reaction. Other batches of materials are added successively until the reaction is complete, resulting in a high-temperature melt. After settling, the slag and gold naturally separate. After cooling, a lower ilmenite alloy and an upper titanium corundum material are obtained. By adjusting the proportion of metallic aluminum, titanium corundum materials with different Ti2O3 contents can be prepared. The preparation method described in the applicant's authorized patent "CN111747761B A Titanium-Reinforced Corundum Refractory Material and Preparation Method" can be referenced.

[0038] Using titanium corundum (20 wt.% Ti2O3 content, ≤1 mm particle size) and carbon black (≤1 μm particle size) as raw materials, the ratio of Ti2O3:C = 4:1 (titanium corundum: carbon black = 20:1), and the amount of phenolic resin binder added is 2% of the total mass of titanium corundum and carbon black. The titanium corundum, carbon black, and phenolic resin binder are mixed evenly and pressed into pellets with a diameter of approximately 5 cm. The pellets are placed in a graphite crucible, and nitriding sintering is carried out in a medium-frequency furnace under flowing nitrogen gas and electromagnetic induction heating. The controlled parameters are: N2 content ≥99.5% in the nitrogen atmosphere, electromagnetic induction frequency 1000 Hz, sintering temperature 1800℃, and sintering time 10 min, thus obtaining TiN-Al2O3 composite refractory material. The preparation method flowchart is shown below. Figure 1 As shown.

[0039] The obtained TiN-Al2O3 composite refractory material was tested and found that its main phase composition was Al2O3 and TiN (Al2O3 content was 81.2 wt%, TiN content was 17.3 wt%), with an apparent porosity of 7.3% and a bulk density of 3.90 g / cm³. 3 .

[0040] Example 2

[0041] Using titanium corundum (50 wt.% Ti2O3 content, ≤2 mm particle size) and carbon black (≤0.5 μm particle size) as raw materials, the ratio of Ti2O3:C was 5:1 (titanium corundum: carbon black = 10:1), and the amount of phenolic resin binder added was 5% of the total mass of titanium corundum and carbon black. The titanium corundum, carbon black, and phenolic resin binder were mixed evenly and pressed into pellets with a diameter of approximately 5 cm. The pellets were placed in a graphite crucible, and nitriding sintering was carried out in a medium-frequency furnace under flowing nitrogen gas and electromagnetic induction heating. The controlled parameters were: N2 content ≥99.5% in the nitrogen atmosphere, electromagnetic induction frequency 2000 Hz, sintering temperature 1900℃, and sintering time 30 min, to obtain TiN-Al2O3 composite refractory material.

[0042] The obtained TiN-Al2O3 composite refractory material was tested and found that its main phase composition was Al2O3 and TiN (Al2O3 content was 51.5 wt%, TiN content was 43.6 wt%), with an apparent porosity of 7.1% and a bulk density of 4.90 g / cm³. 3 .

[0043] Example 3

[0044] Using titanium corundum (5 wt.% Ti2O3 content, ≤3 mm particle size) and graphite (≤1 μm particle size) as raw materials, the ratio of Ti2O3:C = 6:1 (titanium corundum:carbon black = 120:1), and the amount of phenolic resin binder added is 5% of the total mass of titanium corundum and graphite. The titanium corundum, graphite, and phenolic resin binder are mixed evenly and pressed into pellets with a diameter of approximately 5 cm. The pellets are placed in a graphite crucible, and nitriding sintering is carried out in a medium-frequency furnace under flowing nitrogen gas and electromagnetic induction heating. The controlled parameters are: N2 content in the nitrogen atmosphere ≥99.5%, electromagnetic induction frequency 2500 Hz, sintering temperature 1760℃, and sintering time 50 min, to obtain TiN-Al2O3 composite refractory material.

[0045] The obtained TiN-Al2O3 composite refractory material was tested and found that its main phase composition was Al2O3 and TiN (Al2O3 content was 92.5 wt%, TiN content was 3.9 wt%), with an apparent porosity of 6.9% and a bulk density of 3.86 g / cm³. 3 .

[0046] Example 4

[0047] Using titanium corundum (15 wt.% Ti2O3 content, ≤1 mm particle size) and graphite (≤5 μm particle size) as raw materials, the ratio of Ti2O3:C = 4:1 (titanium corundum:graphite = 26:1), and the amount of phenolic resin binder added is 4% of the total mass of titanium corundum and graphite. The titanium corundum, graphite, and phenolic resin binder are mixed evenly and pressed into pellets with a diameter of approximately 5 cm. The pellets are placed in a graphite crucible, and nitriding sintering is carried out in a medium-frequency furnace under flowing nitrogen gas and electromagnetic induction heating. The controlled parameters are: N2 content in the nitrogen atmosphere ≥99.5%, electromagnetic induction frequency 2000 Hz, sintering temperature 1670℃, and sintering time 45 min, to obtain TiN-Al2O3 composite refractory material.

[0048] The obtained TiN-Al2O3 composite refractory material was tested and found that its main phase composition was Al2O3 and TiN (Al2O3 content was 88.5 wt%, TiN content was 10.2 wt%), with an apparent porosity of 6.7% and a bulk density of 3.89 g / cm³. 3 .

[0049] Example 5

[0050] Using titanium corundum (25 wt.% Ti2O3 content, ≤1 mm particle size) and graphite (≤5 μm particle size) as raw materials, the ratio of Ti2O3:C = 4:1 (titanium corundum:graphite = 16:1), and the amount of phenolic resin binder added is 3% of the total mass of titanium corundum and graphite. The titanium corundum, graphite, and phenolic resin binder are mixed evenly and pressed into pellets with a diameter of approximately 5 cm. The pellets are placed in a graphite crucible, and nitriding sintering is carried out in a medium-frequency furnace under flowing nitrogen gas and electromagnetic induction heating. The controlled parameters are: N2 content in the nitrogen atmosphere ≥99.5%, electromagnetic induction frequency 1500 Hz, sintering temperature 1670℃, and sintering time 45 min, thus obtaining TiN-Al2O3 composite refractory material.

[0051] The obtained TiN-Al2O3 composite refractory material was tested and found that its main phase composition was Al2O3 and TiN (Al2O3 content was 76 wt%, TiN content was 22 wt%), with an apparent porosity of 6.3% and a bulk density of 3.92 g / cm³. 3 .

[0052] Comparative Example 1

[0053] Using titanium corundum (25 wt.% Ti2O3 content, ≤1 mm particle size) and graphite (≤5 μm particle size) as raw materials, the ratio of Ti2O3:C = 4:1 (titanium corundum:graphite = 16:1), and the amount of phenolic resin binder added is 3% of the total mass of titanium corundum and graphite. The titanium corundum, graphite, and phenolic resin binder are mixed evenly and pressed into pellets with a diameter of approximately 5 cm. The pellets are placed in a nitriding furnace, and flowing nitrogen gas is introduced for nitriding sintering. The controlled parameters are: N2 content in the nitrogen atmosphere ≥99.5%, sintering temperature 1670℃, and holding time 45 min.

[0054] Comparative Example 1 did not use electromagnetic induction heating; the XRD pattern of the material after firing is as follows: Figure 6 As shown, its main phase composition is Al2O3 and Ti2O3. No diffraction peaks of TiN were detected because TiN is only generated in small amounts on the surface, and it is difficult to be detected by diffraction when its content is less than 3%.

[0055] In this invention, the titanium corundum raw material is a composite material whose main phases are Ti2O3 and Al2O3, and is a by-product slag from the aluminothermic reduction of ilmenite to prepare ferrotitanium alloys. Metallic aluminum is used to reduce metallic iron and titanium in ilmenite to prepare ferrotitanium alloys. During the production process, CaO slagging agent is generally added to form a low-melting-point TiO2-Al2O3-CaO system, lowering the melting point of the slag and promoting efficient gold-slag separation. At this point, the main components of the ferrotitanium slag are Al2O3, TiO2, and CaO, which has poor high-temperature performance and is at risk of hydration, severely limiting its application in high-temperature industries.

[0056] To achieve high-value utilization of ferroiloy slag, Beijing University of Science and Technology has developed a new ferroiloy alloy smelting process: without adding CaO, the system temperature is increased by raising the preheating temperature of the raw materials and adding heating devices, thereby reducing the viscosity of the slag and achieving effective slag-gold separation. The ferroiloy slag produced using this new process typically has an apparent porosity of 4.8% and a bulk density of 3.85 g / cm³. 3 The main phase composition is Al2O3 and Ti2O3, which is the titanium corundum in this invention.

[0057] Figure 2 These are microscopic morphology images of titanium corundum raw materials with different Ti2O3 contents. Figure 2 (a), (b), (c), and (d) show the microstructures of titanium corundum with Ti2O3 mass percentages of 15%, 20%, 25%, and 30%, respectively. Figure 3 Industrial CT scan images of titanium corundum raw materials with different Ti2O3 contents are shown. Figure 3 (a) is a titanium corundum raw material with a Ti2O3 content of 15%. Figure 3(b) is a CT scan image of titanium corundum raw material with a Ti2O3 content of 30%. Microstructural observation using scanning electron microscopy and industrial CT revealed that it is mainly composed of Ti2O3. Figure 2 Low-valent titanium oxides (in the medium-bright white area) are uniformly distributed in corundum ( Figure 2 At the grain boundaries (in the gray area shown), corundum and titanium trioxide crystals exhibit a uniform and independent phase distribution at the microscale. Therefore, titanium corundum is a Ti₂O₃-Al₂O₃ composite material.

[0058] Titanium is a variable-valence metal, and titanium oxides are highly sensitive to oxygen partial pressure. In the aforementioned titanium corundum raw materials, Ti₂O₃ maintains high chemical reactivity when it exists stably and independently within the corundum matrix. Titanium corundum is mixed with carbon powder, pressed into pellets, placed in a graphite crucible, and heated in a medium-frequency furnace under nitrogen gas and electromagnetic induction. After the medium-frequency furnace is energized, the magnetic field generated by the coil passes through the graphite crucible, causing eddy currents inside the crucible and rapidly increasing the temperature. When the temperature reaches 1400℃, the pellets in contact with the graphite crucible first undergo a carbothermic reduction nitridation reaction: Ti₂O₃(s) + C(s) + N₂(g) → TiN(s) + CO(g), generating TiN. Due to the excellent electrical conductivity of TiN, the newly generated TiN is rapidly heated under the action of the electromagnetic induction coil, generating a large amount of heat, which further promotes the carbothermic reduction nitridation reaction of the internal pellets. The TiN formation reaction diffuses inward layer by layer until the reaction is completed, and the pellets are completely transformed into TiN-Al₂O₃ composite material. Under the action of electromagnetic induction heating, the temperature of the TiN-Al₂O₃ composite material can be further increased to about 2000℃. Through heat preservation, its dense sintering is achieved, obtaining a high-density TiN-Al₂O₃ composite refractory material raw material, the macroscopic morphology of which is as follows. Figure 4 As shown.

[0059] Will Figure 4 The preparation shown resulted in the pellets being crushed into a 200-mesh fine powder, which was then mixed evenly. Samples were taken for X-ray diffraction analysis, and the results are as follows. Figure 5 As shown in the figure, the main crystalline phases of the material are α-Al₂O₃ and TiN, with no Ti₂O₃ phase detected, indicating that the Ti₂O₃ in the raw material has been completely converted into the TiN phase.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this invention, and these modifications or substitutions should all be covered within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A TiN-Al2O3 composite material, characterized in that, It comprises the following components by mass percentage: 53%~95% Al2O3, 3%~45% TiN, and the remainder being impurities; The raw materials for preparing the TiN-Al2O3 composite material are titanium corundum and carbon powder, and the binder is phenolic resin. The preparation method of the TiN-Al2O3 composite material includes the following steps: (1) Weigh the titanium corundum, carbon powder and binder according to the ratio, stir evenly and press into balls; (2) Place the pellets from step (1) in a graphite crucible, introduce flowing nitrogen into a medium frequency furnace, and sinter by electromagnetic induction heating with electricity. After the reaction is complete, the finished product is obtained.

2. The TiN-Al2O3 composite material according to claim 1, characterized in that, The particle size of the titanium corundum is ≤5 mm, and the particle size of the carbon powder is ≤0.2 mm.

3. The TiN-Al2O3 composite material according to claim 2, characterized in that, The main phase composition of the titanium corundum raw material is Al2O3 and Ti2O3, and the content of Ti2O3 is 3-50% by mass percentage; the carbon powder is selected from at least one of carbon black, graphite and carbon nanotubes.

4. The TiN-Al2O3 composite material according to claim 2 or 3, characterized in that, The mass ratio of titanium corundum to carbon powder is Ti2O3:C = (4.0~6.0):1.0; the amount of binder added is 0.5~5% of the total mass of titanium corundum and carbon powder.

5. The TiN-Al2O3 composite material according to claim 1, characterized in that, In step (1), titanium corundum and carbon powder are first premixed to obtain a mixed powder, and then the mixed powder is stirred with the binder phenolic resin until it is evenly mixed.

6. The TiN-Al2O3 composite material according to claim 1, characterized in that, The control parameters for electromagnetic induction heating sintering in step (2) are: N2 content in nitrogen atmosphere ≥ 99.5%, electromagnetic induction frequency ≥ 1000 Hz, sintering temperature 1400~2000℃, and sintering time 10~60 min.

Images