Silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting and preparation method

Abstract

The present invention relates to the technical field of aluminum alloy die-casting, and more particularly to a silicon nitride-bonded silicon carbide ceramic feed tube for aluminum alloy die-casting and a preparation method thereof. The silicon nitride-bonded silicon carbide ceramic feed tube for aluminum alloy die-casting has an annular structure with an open ring wall. The tube is made of silicon nitride-bonded silicon carbide ceramic and is prepared from 45 to 85 parts by weight of a mixed powder, 3 to 10 parts by weight of a reinforcing agent, and 15 to 40 parts by weight of a conditioning agent solution; the mixed powder comprises elemental silicon powder, silicon nitride powder, and silicon carbide powder. Due to the in-situ SiTi2N4 reinforcement phase, the feed tube exhibits excellent wear resistance, thermal shock resistance, and low thermal conductivity, making it adaptable to the service environment of ultra-high pressure casting machines and significantly improving the production efficiency of high-pressure casting machines. The reduced thermal conductivity of the ceramic material reduces heat loss, enhances the temperature control capability of the aluminum alloy fluid within the feed tube, and ensures the product's high performance and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy die-casting, and in particular to a silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die-casting and a preparation method thereof. Background Art

[0002] In recent years, the rapid development of new energy vehicles and aerospace has placed higher demands on lightweight, high-toughness, and corrosion-resistant castings. For aluminum alloy parts, the forming process of high-strength, high-toughness corrosion-resistant alloys, deformable alloys, and large, complex alloy parts has become a research hotspot for lightweight alloys.

[0003] Aluminum alloys produced using traditional casting processes, such as gravity casting and high-pressure casting (500t), often exhibit low tensile strength and elongation in the cast state. With the increasing demand for high-strength, lightweight castings, the advantages of using ultra-high-pressure casting (over 5000t) to produce aluminum alloy parts are gaining attention.

[0004] To meet the requirements of continuous operation and improved production efficiency for high-pressure die-casting machines (especially large-tonnage die-casting machines over 5,000 tons), higher standards have been set for the performance of the feed pipe at the die-casting machine feed port. Existing high-pressure die-casting machine feed pipes are mostly made of H13 metal heat-resistant steel. They are easily deformed during continuous production at operating temperatures, have poor wear resistance, and poor thermal insulation performance, requiring the use of supporting cooling facilities. This not only causes heat loss and energy waste, but also causes the aluminum alloy to solidify prematurely in the feed pipe, causing wear on the inner wall of the feed pipe and, in severe cases, blockage of the feed pipe. It also hinders the crystallization and forming of the aluminum alloy during the die-casting process, affecting the strength and toughness of the die-casting parts, reducing the yield rate, and increasing production costs.

[0005] Silicon nitride-bonded silicon carbide is a high-quality refractory material with excellent corrosion resistance, erosion resistance, and wear resistance. Compared to other non-oxide refractory materials (such as recrystallized silicon carbide), it has a price advantage. Therefore, silicon nitride-bonded silicon carbide is widely used in nonferrous metallurgy, steel smelting, petrochemical industry, automobile manufacturing and other fields. However, the existing production process of silicon nitride-bonded silicon carbide uses refractory-grade raw materials, and the mixing and molding processes are relatively backward. The resulting silicon nitride-bonded silicon carbide has poor uniformity and poor high-temperature service performance, making it difficult to apply to high-pressure casting of aluminum alloys.

[0006] Therefore, we propose a silicon nitride combined with silicon carbide ceramic material tube for aluminum alloy die casting and a preparation method to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting and a preparation method.

[0008] A silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die-casting. The tube material is annular with an open ring wall structure. The material is silicon nitride bonded silicon carbide ceramic and is made from 45 to 85 parts by weight of mixed powder, 3 to 10 parts by weight of reinforcing agent, and 15 to 40 parts by weight of conditioning agent solution.

[0009] The mixed powder is composed of 35 to 55 parts by weight of elemental silicon powder, 5 to 10 parts by weight of silicon nitride powder, and 5 to 20 parts by weight of silicon carbide powder;

[0010] The reinforcing agent powder comprises 1 to 3 parts by weight of titanium nitride powder, 1 to 2 parts by weight of titanium carbide powder and 1 to 5 parts by weight of titanium silicon alloy.

[0011] Preferably, the purity of the elemental silicon powder is ≥99wt%, and the particle size is 200-600 mesh; the purity of the silicon nitride powder is ≥99wt%, and the particle size is 600-1000 mesh; the purity of the silicon carbide powder is ≥99wt%, and the particle size is 600-1000 mesh.

[0012] Preferably, the purity of the reinforcing agent powder is ≥98wt%, and the particle size is 200-400 mesh.

[0013] Preferably, the mass ratio of water, surfactant and HPMC in the conditioning agent solution is 1:0.02-0.05:0.15-0.25.

[0014] A method for preparing a silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting comprises the following steps:

[0015] S1. Mix the mixed powder and the reinforcing agent powder separately under argon or nitrogen protection for 12 hours, place the mixed powder, anhydrous ethanol and high-speed ball milling beads in an atmosphere-protected high-speed ball mill and grind for 1 to 4 hours, then add the reinforcing agent powder and continue grinding for 2 to 8 hours to obtain a slurry;

[0016] S2. Dry the slurry obtained in step S1 at 60-150° C. using a spray granulation device to obtain a uniform and stable powder, add a conditioning agent solution in an amount of 25-35 wt% of the total weight of the powder, and knead in a kneader for 0.5-6 h to obtain a slurry;

[0017] S3, making the clay obtained in step S2 into a ceramic tube blank, and drying it under constant temperature and humidity conditions;

[0018] S4, placing the ceramic tube blank obtained in step S3 in a binder removal furnace, heating the temperature to 600-1050° C. at a heating rate of 1-5° C. / min, and keeping the temperature for 0.5-3 h to obtain a silicon nitride-bonded silicon carbide ceramic tube blank;

[0019] S5. Place the ceramic tube blank obtained in step S4 in a high-temperature sintering furnace, and in a nitrogen atmosphere, heat it to 1050°C at a heating rate of 5-15°C / min, keep it warm for 0.5-1h, heat it to 1200°C at a heating rate of 5-15°C / min, keep it warm for 1-3h, heat it to 1410-1450°C at a heating rate of 5-15°C / min, keep it warm for 2-5h, and then heat it to 1500-1650°C at a heating rate of 5-10°C / min, keep it warm for 1-4h to obtain a new silicon nitride bonded silicon carbide ceramic tube.

[0020] Preferably, in step S1, the speed of the high-speed ball mill is 250 r / min to 350 r / min, the ball milling time is 6 to 9 h, the mass ratio of the mixed powder to anhydrous ethanol and high-speed ball milling beads is 1:4 to 8:2 to 3, the high-speed ball milling beads are one or more of agate ball milling beads, stainless steel ball milling beads and corundum ball milling beads, and the protective atmosphere is vacuum, argon, nitrogen or a composite atmosphere thereof.

[0021] Preferably, in step S2, the slurry is dried at 80-110° C. using a spray granulation device.

[0022] Preferably, in step S3, the clay is placed in a clay kneading machine for kneading to obtain homogeneous clay, and then placed in an extruder to obtain a ceramic tube blank.

[0023] Preferably, in step S3, the ceramic tube blank obtained by extrusion molding is subjected to isostatic pressing, and the isostatic pressing pressure is 150 to 200 MPa.

[0024] Preferably, in step S4, when the ceramic tube blank is sintered in a binder removal furnace, the atmosphere is one or more of vacuum, argon, and nitrogen.

[0025] The beneficial effects of the present invention are:

[0026] 1. Ceramic feed tubes have excellent chemical corrosion resistance, which can increase the service life of feed tubes (especially large-tonnage die-casting machines above 5000t) by 3 to 4 times, avoiding the contamination of alloy liquid by feed tube materials. At the same time, ceramic feed tubes do not deform in hot state, have high hardness and good wear resistance, and their hardness and wear resistance basically do not decay with heat, which makes the die-casting operation stable. When the shot head is pressurized and pushed, the alloy melt does not flow back, and the boost pressure that can be applied is greater.

[0027] 2. The thermal conductivity of the ceramic material tube lining is 1 / 2 to 1 / 3 of the existing H13 material metal material, which reduces the heat loss of the alloy melt in the material tube and can reduce the casting temperature of the alloy melt by about 20 to 40°C. No cooling facilities are required during use, which can save energy, achieve semi-solid die-casting, improve the density and strength of die-castings, improve the quality of die-castings, and increase the die-casting efficiency by about 20 to 40%. At the same time, the production cycle of silicon nitride combined with silicon carbide ceramic composite pipes is short, about 5 to 8 days, which is about 2 / 3 less than the production time of 19 to 23 days for traditional metal material tubes. It can better meet emergency needs and reduce spare parts inventory.

[0028] 3. During the high-temperature heat treatment process, SiTi2N4 is generated in situ. This is a strong covalent bond superhard material with metallic properties. It reduces the mechanical loss of the aluminum liquid to the material tube during the high-pressure semi-solid die-casting process. At the same time, SiTi2N4 can form a good chemical bond with silicon nitride and silicon carbide, thereby improving the comprehensive mechanical properties of the material tube, keeping the aluminum liquid clean, and greatly improving the service life of the material tube and the die-casting efficiency.

[0029] 4. The in-situ spinel-type SiTi2N4 has a metal band structure, which can enhance the toughness of silicon nitride-bonded silicon carbide ceramic tubes, while significantly improving the thermal shock stability of the composite material and significantly increasing its service life. DETAILED DESCRIPTION

[0030] The present invention will be further explained below with reference to specific embodiments.

[0031] Example 1:

[0032] A silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die-casting has an annular structure with an open ring wall. The tube is made of silicon nitride bonded silicon carbide ceramic and is made from 58 parts by weight of mixed powder, 8 parts by weight of a reinforcing agent, and 24.8 parts by weight of a conditioning agent solution.

[0033] The mixed powder consists of 40 parts by weight of elemental silicon powder, 8 parts by weight of silicon nitride powder, and 10 parts by weight of silicon carbide powder;

[0034] The purity of elemental silicon powder is ≥99wt%, and the particle size is 400 mesh; the purity of silicon nitride powder is ≥99wt%, and the particle size is 800 mesh; the purity of silicon carbide powder is ≥99wt%, and the particle size is 8000 mesh; the purity of the reinforcing agent powder is ≥98wt%, and the particle size is 300 mesh.

[0035] The reinforcing agent powder includes 3 parts by weight of titanium nitride powder, 2 parts by weight of titanium carbide powder and 3 parts by weight of titanium silicon alloy.

[0036] The conditioner solution consists of 20 parts by weight of water, 0.8 parts by weight of a surfactant and 4 parts by weight of HPMC.

[0037] A method for preparing a silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting comprises the following steps:

[0038] S1. The mixed powder and the reinforcing agent powder were mixed separately under argon protection for 12 hours to prevent oxidation of the raw materials. The mixed powder, anhydrous ethanol and high-speed ball milling beads were accurately weighed according to a mass ratio of 1:6:2.5, and placed in a high-speed ball mill with an argon atmosphere and a rotation speed of 300 r / min for 2 hours. Then, the reinforcing agent powder was added and continued to be ground for 4 hours to obtain a slurry; the high-speed ball milling beads were agate ball milling beads;

[0039] S2. The slurry obtained in step S1 is dried at 100° C. using a spray granulation device to obtain a uniform and stable powder, a conditioning agent solution is added, and the mixture is kneaded in a kneader for 3 hours to obtain a slurry;

[0040] S3, the obtained clay is placed in a clay maker to knead the clay to obtain a homogeneous clay, which is then placed in an extruder to obtain a ceramic tube blank, which is then placed in an isostatic press and isostatically pressed at 180 MPa to obtain a dense ceramic tube blank, which is then dried under constant temperature and humidity conditions;

[0041] S4, placing the ceramic tube blank obtained in step S3 in a binder removal furnace in a nitrogen atmosphere, heating the temperature to 700° C. at a heating rate of 3° C. / min, and keeping the temperature for 2 hours to obtain a silicon nitride bonded silicon carbide ceramic tube blank;

[0042] S5. Place the ceramic tube blank obtained in step S4 in a high-temperature sintering furnace, and in a nitrogen atmosphere, heat it to 1430°C at a heating rate of 10°C / min, keep it warm for 3 hours, and then heat it to 1600°C at a heating rate of 8°C / min, keep it warm for 3 hours to obtain a new silicon nitride bonded silicon carbide ceramic tube.

[0043] Example 2:

[0044] A silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die-casting has an annular structure with an open ring wall. The material is silicon nitride bonded silicon carbide ceramic and is prepared from 74 parts by weight of mixed powder and 26 parts by weight of a conditioning agent solution.

[0045] The mixed powder consists of 35 parts by weight of elemental silicon powder, 10 parts by weight of silicon nitride powder, 20 parts by weight of silicon carbide powder and 9 parts by weight of a reinforcing agent;

[0046] The purity of elemental silicon powder is ≥99wt%, and the particle size is 400 mesh; the purity of silicon nitride powder is ≥99wt%, and the particle size is 800 mesh; the purity of silicon carbide powder is ≥99wt%, and the particle size is 8000 mesh; the purity of the reinforcing agent powder is ≥98wt%, and the particle size is 300 mesh.

[0047] The reinforcing agent powder includes 3 parts by weight of titanium nitride powder, 2 parts by weight of titanium carbide powder and 4 parts by weight of titanium silicon alloy.

[0048] The conditioner solution consists of 20 parts by weight of water, 1 part by weight of a surfactant and 5 parts by weight of HPMC.

[0049] A method for preparing a silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting comprises the following steps:

[0050] S1. The mixed powder and the reinforcing agent powder were mixed separately under nitrogen protection for 12 hours to prevent oxidation of the raw materials. The mixed powder, anhydrous ethanol and high-speed ball milling beads were accurately weighed according to a mass ratio of 1:6:2.5, and placed in a high-speed ball mill with a speed of 300 r / min under nitrogen atmosphere and ground for 2 hours. Then, the reinforcing agent powder was added and continued to be ground for 4 hours to obtain a slurry; the high-speed ball milling beads were stainless steel ball milling beads;

[0051] S2. Dry the slurry obtained in step S1 at 100° C. using a spray granulation device to obtain a uniform and stable powder, and knead it in a kneader for 4 hours to obtain a mud material;

[0052] S3, the obtained clay material is placed in a clay maker to obtain a homogeneous clay material, which is then placed in an extruder to obtain a ceramic tube blank, and then placed in an isostatic press to perform isostatic pressing at 180 MPa to obtain a dense ceramic tube blank;

[0053] S4, placing the ceramic tube blank obtained in step S3 in a binder removal furnace in a nitrogen atmosphere, heating the temperature to 800° C. at a heating rate of 3° C. / min, and keeping the temperature for 2 hours to obtain a silicon nitride bonded silicon carbide ceramic tube blank;

[0054] S5. Place the ceramic tube blank obtained in step S4 in a high-temperature binder removal furnace, and in a nitrogen atmosphere, heat it to 1440°C at a heating rate of 10°C / min, keep it warm for 3 hours, then heat it to 1620°C at a heating rate of 5-10°C / min, and keep it warm for 2.5 hours to obtain a new silicon nitride bonded silicon carbide ceramic tube.

[0055] Example 3:

[0056] A silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die-casting has an annular structure with an open ring wall. The material is silicon nitride bonded silicon carbide ceramic and is prepared from 75 parts by weight of mixed powder and 24.8 parts by weight of a conditioning agent solution.

[0057] The mixed powder consists of 40 parts by weight of elemental silicon powder, 10 parts by weight of silicon nitride powder, 15 parts by weight of silicon carbide powder and 10 parts by weight of a reinforcing agent;

[0058] The purity of elemental silicon powder is ≥99wt%, and the particle size is 400 mesh; the purity of silicon nitride powder is ≥99wt%, and the particle size is 800 mesh; the purity of silicon carbide powder is ≥99wt%, and the particle size is 8000 mesh; the purity of the reinforcing agent powder is ≥98wt%, and the particle size is 300 mesh.

[0059] The reinforcing agent powder includes 3 parts by weight of titanium nitride powder, 2 parts by weight of titanium carbide powder and 5 parts by weight of titanium silicon alloy.

[0060] The conditioner solution consists of 20 parts by weight of water, 0.8 parts by weight of a surfactant and 4 parts by weight of HPMC.

[0061] A method for preparing a silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting comprises the following steps:

[0062] S1. The mixed powder and the reinforcing agent powder were mixed separately under nitrogen protection for 12 hours to prevent oxidation of the raw materials. The mixed powder, anhydrous ethanol and high-speed ball milling beads were accurately weighed according to a mass ratio of 1:6:2.5, and placed in a high-speed ball mill with a speed of 300 r / min under nitrogen atmosphere and ground for 2 hours. Then, the reinforcing agent powder was added and continued to be ground for 4 hours to obtain a slurry; the high-speed ball milling beads were corundum ball milling beads;

[0063] S2. Dry the slurry obtained in step S1 at 80° C. using a spray granulation device to obtain a uniform and stable powder, and knead it in a kneader for 3 hours to obtain a mud material;

[0064] S3, the obtained clay material is placed in a clay maker to obtain a homogeneous clay material, which is then placed in an extruder to obtain a ceramic tube blank, and then placed in an isostatic press to perform isostatic pressing at 180 MPa to obtain a dense ceramic tube blank;

[0065] S4, placing the ceramic tube blank obtained in step S3 in a binder removal furnace in a nitrogen atmosphere, heating the temperature to 800° C. at a heating rate of 5° C. / min, and keeping the temperature for 1.5 hours to obtain a silicon nitride bonded silicon carbide ceramic tube blank;

[0066] S5. Place the ceramic tube blank obtained in step S4 in a high-temperature binder removal furnace, and in a nitrogen atmosphere, heat it to 1430°C at a heating rate of 10°C / min, keep it warm for 4 hours, then heat it to 1600°C at a heating rate of 8°C / min, and keep it warm for 2 hours to obtain a new silicon nitride bonded silicon carbide ceramic tube.

[0067] Comparative Example:

[0068] A silicon nitride bonded silicon carbide material tube is made from the following raw materials in parts by weight:

[0069] 10 parts by weight of elemental silicon powder, 20 parts by weight of silicon nitride powder, and 20 parts by weight of silicon carbide powder.

[0070] The preparation method comprises the following steps:

[0071] S1. Mix elemental silicon powder, silicon nitride powder and silicon carbide powder at 60° C. for 1.5 h to obtain a uniform mixture;

[0072] S2, drying the mixture prepared in step S1 at a temperature of 200° C. and a humidity of 3% for 5 h, and sealing the mixture for 36 h to obtain a formed mixture;

[0073] S3, forming the mixed material obtained in step S2 by friction forming to obtain a raw material tube blank;

[0074] S4. Place the raw material tube obtained in step S3 in a high-temperature furnace, a box-type carbonization furnace, and sinter under the protection of a nitrogen atmosphere. Heat the temperature to 1200°C at a heating rate of 60°C / h and keep it at this temperature for 2h to obtain the raw material tube.

[0075] The mechanical properties and thermal shock stability tests of the silicon nitride-bonded silicon carbide ceramic tubes in Examples 1 to 3 and the comparative example were conducted. The test results are as follows:

[0076]

[0077] Among them, the hardness is the Vickers hardness at room temperature, and the testing standard is GB / T 16534-2009; the thermal expansion coefficient is the linear thermal expansion coefficient between 20℃ and 300℃, and the testing standard is YS / T 63.4-2006; the thermal shock cracking test is the residual strength retention rate after water cooling at 1000℃, and the testing standard is YB 4018-91; the thermal conductivity coefficient is tested in accordance with GB / T 39862-2021; and the wear resistance coefficient is room temperature wear resistance, and the testing standard is GB / T 18301-2012.

[0078] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting, characterized in that: The tube material is annular with an open ring wall structure. The material is silicon nitride bonded silicon carbide ceramics, and is prepared from 45 to 85 parts by weight of mixed powder, 3 to 10 parts by weight of reinforcing agent, and 15 to 40 parts by weight of conditioning agent solution. The mixed powder is composed of 35 to 55 parts by weight of elemental silicon powder, 5 to 10 parts by weight of silicon nitride powder, and 5 to 20 parts by weight of silicon carbide powder; The reinforcing agent powder comprises 1 to 3 parts by weight of titanium nitride powder, 1 to 2 parts by weight of titanium carbide powder and 1 to 5 parts by weight of titanium silicon alloy; The method for preparing the silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting comprises the following steps: S1. The mixed powder and the reinforcing agent powder are mixed separately under argon or nitrogen protection for 12 hours for standby use, the mixed powder, anhydrous ethanol and high-speed ball milling beads are placed in an atmosphere-protected high-speed ball mill and ground for 1 to 4 hours, and then the reinforcing agent powder is added and continued to be ground for 2 to 8 hours to obtain a slurry; S2. Dry the slurry obtained in step S1 at 60-150° C. using a spray granulation device to obtain a uniform and stable powder, add 25-35 wt% of the conditioning agent solution based on the total mass of the powder, and knead in a kneader for 0.5-6 h to obtain a slurry; S3, making the clay obtained in step S2 into a ceramic tube blank, and drying it under constant temperature and humidity conditions; S4, placing the ceramic tube blank obtained in step S3 in a binder removal furnace, heating the temperature to 600-1050° C. at a heating rate of 1-5° C. / min, and keeping the temperature for 0.5-3 h to obtain a silicon nitride-bonded silicon carbide ceramic tube blank; S5. Placing the ceramic tube body obtained in step S4 in a high-temperature sintering furnace, heating the tube body to 1050° C. at a heating rate of 5-15° C. / min under a nitrogen atmosphere, holding the temperature for 0.5-1 h, heating the tube body to 1200° C. at a heating rate of 5-15° C. / min, holding the temperature for 1-3 h, heating the tube body to 1410-1450° C. at a heating rate of 5-15° C. / min, holding the temperature for 2-5 h, and then heating the tube body to 1500-1650° C. at a heating rate of 5-10° C. / min, holding the temperature for 1-4 h, to obtain a silicon nitride bonded silicon carbide ceramic tube. The mass ratio of water, surfactant and HPMC in the conditioning agent solution is 1:0.02-0.05:0.15-0.

25.

2. The silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting according to claim 1, characterized in that: The purity of the elemental silicon powder is ≥99wt%, and the particle size is 200-600 mesh. The purity of the silicon nitride powder is ≥99wt%, and the particle size is 600-1000 mesh. The purity of the silicon carbide powder is ≥99wt%, and the particle size is 600-1000 mesh.

3. The silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting according to claim 1, characterized in that: The purity of the reinforcing agent powder is ≥98wt%, and the particle size is 200-400 meshes.

4. The silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting according to claim 1, characterized in that: In step S1, the rotation speed of the high-speed ball mill is 250 r / min to 350 r / min, the ball milling time is 6 to 9 hours, the mass ratio of the mixed powder to anhydrous ethanol and high-speed ball milling beads is 1:4 to 8:2 to 3, the high-speed ball milling beads are one or more of agate ball milling beads, stainless steel ball milling beads and corundum ball milling beads, and the protective atmosphere is vacuum, argon, nitrogen or a composite atmosphere thereof.

5. The silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting according to claim 1, characterized in that: In step S2, the slurry is dried at 80-110°C using a spray granulation device.

6. The silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting according to claim 1, characterized in that: In step S3, the clay material is placed in a clay kneading machine for kneading to obtain homogeneous clay material, and then placed in an extruder to obtain a ceramic material tube blank.

7. The silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting according to claim 6, characterized in that: In step S3, the ceramic tube blank obtained by extrusion molding is subjected to isostatic pressing, and the isostatic pressing pressure is 150-200 MPa.

8. The silicon nitride bonded silicon carbide ceramic material tube for aluminum alloy die casting according to claim 1, characterized in that: In step S4, when the ceramic tube blank is sintered in the binder removal furnace, the atmosphere is one or more of vacuum, argon, and nitrogen.

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