Ceramic heating tube and preparation method thereof

Abstract

The invention relates to the technical field of ceramics, and particularly discloses a ceramic heating tube and a preparation method thereof. The ceramic heating tube comprises the following substances in parts by weight: 93-94 parts of aluminum oxide; 3 to 3.5 parts of talcum powder; 1.5-2 parts of calcium carbonate; 2 to 2.5 parts of silicon dioxide; 0.1 to 1 part of zirconium oxide; 7 to 9 parts of PVB; 3 to 5 parts of DBP; 1-2 parts of castor oil; and 30-35 parts of a solvent. The preparation method comprises the following steps: S1, raw material weighing; S2, defoaming treatment; S3, tape casting; S4, printing molding; the ceramic heating tube can be used in the fields of electronic cigarettes and the like, and has the advantages of being good in formability, uniform in color, high in strength, high in density, excellent in electrifying performance and the like.

Description

Technical Field

[0001] The present application relates to the technical field of ceramics, and more specifically, to a ceramic heating tube and a preparation method thereof. Background Art

[0002] Ceramic heating tube is a heating product with the characteristics of environmental protection, high reliability and long life, and has broad application market prospects at home and abroad.

[0003] At present, the more common production process is to process ceramic raw materials through ball milling, pressing, sintering, metallization, secondary sintering and nickel plating. Among them, pressing often adopts hot die casting process, and the formed blanks are easy to deform and have low yield. As an important forming process of thin-film ceramic materials, tape casting is widely used in the preparation of ceramic substrates and multilayer structure materials.

[0004] At present, ceramic heating tubes include ordinary alumina ceramic heating elements and zirconia ceramic heating elements. However, ordinary alumina ceramic heating elements have defects such as rapid heat loss and high power consumption. Zirconia ceramic heating elements have defects such as poor thermal conductivity, large thermal expansion coefficient, and easy breakage during use. Therefore, it is necessary to develop a ceramic heating tube with high strength, high thermal conductivity and long service life. Summary of the invention

[0005] In order to improve the defects of ceramic heating tubes such as low strength, low thermal conductivity and easy breakage, the present application provides a ceramic heating tube and a preparation method thereof, which adopts the following technical solutions:

[0006] In a first aspect, the present application provides a ceramic heating tube, comprising the following substances in parts by weight: 93-94 parts of aluminum oxide; 3-3.5 parts of talc; 1.5-2 parts of calcium carbonate; 2-2.5 parts of silicon dioxide; 0.1-1 part of zirconium oxide; 7-9 parts of PVB; 3-5 parts of DBP; 1-2 parts of castor oil; and 30-35 parts of solvent.

[0007] By adopting the above technical solution, the present application preferably uses alumina as the base material of the ceramic heating tube, and adds silicon dioxide to the alumina base material. Since the alumina grains grow rapidly during the sintering and heat preservation process, which is not conducive to the mechanical properties of the ceramic, silicon dioxide, as a common sintering aid, can not only promote the sintering of alumina, but also effectively inhibit the growth rate of alumina grains and improve the mechanical strength of the ceramic heating tube. And at an appropriate addition amount, silicon dioxide can form a supercooled liquid phase to reduce the sintering temperature.

[0008] At the same time, by adding zirconium oxide to the alumina matrix, zirconium oxide can effectively increase the toughness of ceramics and reduce the possibility of ceramic fracture through refinement, microcrack toughening, phase transformation toughening, crack diversion and bifurcation.

[0009] Finally, the present application optimizes the components and the ratio of the components in the ceramic heating tube, and the obtained ceramic heating tube has excellent toughness and formability, high density, high strength, and the product is transparent and has no cloud spots.

[0010] Optionally, the alumina includes micron alumina, and the particle size of the micron alumina is 0.8-4 μm.

[0011] By adopting the above technical solution, the present application preferably uses micron alumina as the substrate. Micron-level alumina particles have excellent surface area and surface energy, providing greater driving force for the cast film, thereby improving the density of the ceramic heating tube. At the same time, alumina particles of appropriate particle size make the fluidity of the slurry suitable, which is conducive to subsequent tape-casting. 0.8 micron alumina is preferred, and the micron alumina is refined, which can maintain the fluidity of the slurry while uniformizing the microstructure of the ceramic heating tube, improving the mechanical properties and density of the ceramic heating tube.

[0012] Optionally, the alumina also includes nano alumina, and a portion of the nano alumina is wrapped in the micron alumina to form coated alumina. The preparation of the coated alumina includes the following steps: mixing the micron alumina with water to obtain a suspension, adding aluminum sulfate and ammonium carbonate to the suspension, continuing stirring, adjusting the pH, ultrasonically dispersing, filtering, retaining solids, washing, drying, and roasting to obtain coated alumina.

[0013] By adopting the above technical solution, micron alumina and nano alumina are used as ceramic substrates, and nano alumina can fill the gaps formed between micron alumina particles, which can further improve the density of the ceramic heating tube. Since part of the nano alumina is wrapped outside the micron alumina, firstly, the content of nano alumina in the slurry can be reduced, and the possibility of nano alumina agglomeration in the slurry can be reduced, so that the nano alumina can be evenly dispersed in the slurry, so that the ceramic heating tube obtains uniform density and strength; secondly, under the coating of nano alumina, the micron alumina can be fully combined with the substrate in the slurry, and the pores formed between the micron alumina particles can be reduced, effectively improving the density and strength of the ceramic heating tube.

[0014] Optionally, it also includes 5-10 parts by weight of CMA (CeMgAl 11 O 19 ) particles.

[0015] By adopting the above technical solution, the present application introduces flaky hexaaluminate into the ceramic substrate by adding CMA particles into the ceramic substrate. The flaky structure can increase the interpenetration strength between the components of the ceramic heating tube, and can consume the fracture energy by pulling out the particles, deflecting the cracks, and bridging, that is, improve the strength of the ceramic heating tube. At the same time, CMA is easier to disperse in the alumina matrix and can fill the gaps between the alumina particles. In addition, during the sintering process, since the sintering rate of CMA is lower than that of alumina, the dispersed flakes can serve as a spacer layer to inhibit the migration of grain boundaries, promote densification, and improve the density and strength of the ceramic heating tube.

[0016] Optionally, the aluminum oxide is PAANH 4 Treated Alumina.

[0017] By adopting the above technical solution, using PAANH 4 Alumina is treated to change its isoelectric point, so that the alumina slurry can be stably suspended in a neutral to alkaline medium, which improves the uniformity of the dispersion of alumina in the slurry and enables the ceramic heating tube to obtain a better density.

[0018] Optionally, 1-2 parts of silicon carbide whiskers are also included.

[0019] By adopting the above technical solution, silicon carbide whiskers are added to the slurry. The introduction of silicon carbide whiskers can form a staggered network structure in the slurry and break through some agglomerated alumina particles, so that the components in the slurry are evenly dispersed and tightly combined, thereby improving the density and strength of the ceramic heating tube.

[0020] Optionally, the silicon carbide whiskers are coated with a quartz layer.

[0021] By adopting the above technical solution, by coating a quartz layer on the silicon carbide whisker, the quartz layer can form a mullite layer on the surface of the silicon carbide after sintering. The introduction of the mullite crystal phase can effectively improve the strength of the silicon carbide whisker, so that the silicon carbide whisker can form a stable skeleton structure inside the ceramic heating tube, and can further improve the bonding effect between the silicon carbide whisker and the remaining components in the ceramic heating tube, thereby improving the strength of the ceramic heating tube. At the same time, since mullite has good mechanical and electrical properties, adding mullite to the ceramic heating tube can effectively improve the thermal conductivity and electrical conductivity, and further improve the thermal conductivity of the ceramic heating tube.

[0022] Optionally, the silicon carbide whiskers are loaded with CaF 2 Nanoparticles.

[0023] By adopting the above technical solution, CaF is loaded on the silicon carbide whisker. 2Nanoparticles can introduce self-lubricating particles onto silicon carbide whiskers, which can promote uniform dispersion of silicon carbide whiskers in the slurry, so that the silicon carbide whiskers can uniformly form a skeleton structure in the ceramic.

[0024] In a second aspect, the present application provides a method for preparing a ceramic heating tube, which adopts the following technical solution:

[0025] A method for preparing a ceramic heating tube comprises the following steps:

[0026] S1. Weighing raw materials: weighing alumina, talc, calcium carbonate, silicon dioxide, zirconium oxide, PVB, DBP, castor oil and solvent by weight, mixing, and ball milling to obtain slurry;

[0027] S2, degassing treatment: using a vacuum pump to degas the slurry;

[0028] S3, tape casting: placing the deaerated slurry on a tape casting machine for tape casting, molding, drying, cutting, and obtaining a molded product;

[0029] S4, printing and molding: printing tungsten paste heating circuit on the molded product, rolling the rod, molding, and obtaining a semi-finished product;

[0030] S5. Sintering and shipment: Place the semi-finished products in containers for sintering, inspection and shipment.

[0031] By adopting the above technical solution, the ceramic heating tube prepared according to the above steps has better formability, is not easy to lose roundness, the product is transparent, has high density and high strength.

[0032] Optionally, in step S1, after the ball milling process, the slurry is screened to remove iron.

[0033] By adopting the above technical solution, after the ball milling treatment, the slurry is subjected to superconducting iron removal, which can effectively remove ferromagnetic impurities in the slurry, reduce the possibility of cloud spots on the ceramic heating tube, make the ceramic heating tube uniform in color, and make the product translucent.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. Since the present application preferably uses alumina as the substrate of the ceramic heating tube, silicon dioxide is added to the alumina substrate. Since the alumina grains grow rapidly during the sintering and heat preservation process, it is not conducive to the mechanical properties of the ceramic. As a common sintering aid, silicon dioxide can not only promote the sintering of alumina, but also effectively inhibit the growth rate of alumina grains and improve the mechanical strength of the ceramic heating tube. And at an appropriate addition amount, silicon dioxide can form a supercooled liquid phase to reduce the sintering temperature. At the same time, zirconium oxide is added to the alumina substrate. Zirconium oxide can effectively increase the toughness of ceramics and reduce the possibility of ceramic fracture by means of refinement, microcrack toughening, phase transformation toughening, crack steering and bifurcation. Finally, the present application preferably selects the components and the proportions of the components in the ceramic heating tube, and the obtained ceramic heating tube has excellent toughness and formability, high density, high strength, and the product is transparent and cloud-free.

[0036] 2. In this application, it is preferred to use micron alumina and nano alumina as the ceramic substrate. Nano alumina can fill the gaps formed between micron alumina particles, which can further improve the density of the ceramic heating tube. Since part of the nano alumina is wrapped outside the micron alumina, firstly, the content of nano alumina in the slurry can be reduced, and the possibility of nano alumina agglomeration in the slurry can be reduced, so that the nano alumina can be evenly dispersed in the slurry, so that the ceramic heating tube can obtain uniform density and strength; secondly, under the coating of nano alumina, the micron alumina can be fully combined with the substrate in the slurry, and the pores formed between the micron alumina particles can be reduced, effectively improving the density and strength of the ceramic heating tube.

[0037] 3. The present application adds CMA particles to the ceramic substrate and introduces flaky hexaaluminate into the ceramic substrate. The flaky structure can increase the interpenetration strength between the components of the ceramic heating tube, and can consume fracture energy through particle extraction, crack deflection and bridging, that is, improve the strength of the ceramic heating tube. At the same time, CMA is easier to disperse in the alumina matrix and can fill the gaps between alumina particles. In addition, during the sintering process, since the sintering rate of CMA is lower than that of alumina, the dispersed flakes can serve as a spacer layer to inhibit the migration of grain boundaries, promote densification, and improve the density and strength of the ceramic heating tube.

[0038] 4. By coating the silicon carbide whisker with a quartz layer, the quartz layer can form a mullite layer on the silicon carbide surface after sintering. The introduction of the mullite crystal phase can effectively improve the strength of the silicon carbide whisker, so that the silicon carbide whisker can form a stable skeleton structure inside the ceramic heating tube, and can further improve the bonding effect between the silicon carbide whisker and the other components in the ceramic heating tube, thereby improving the strength of the ceramic heating tube. At the same time, since mullite has good mechanical and electrical properties, adding it to the ceramic heating tube can effectively improve the thermal conductivity and electrical conductivity, and further improve the thermal conductivity of the ceramic heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of alumina provided in this application. DETAILED DESCRIPTION

[0040] The present application is further described in detail below with reference to the embodiments.

[0041] In the embodiments of the present application, the instruments and equipment used are as follows, but not limited thereto:

[0042] Drugs: Alumina powder D from Alteo 50 The thickness of the silicon carbide whisker is 3.4 μm, and the silicon carbide whisker is from Beijing Beike New Materials Technology Co., Ltd.

[0043] Preparation Example

[0044] Preparation Example of Micron Alumina

[0045] Preparation Example 1

[0046] D 50 Alumina powder with a size of 3.4 μm was ground in a sand mill, XL-1L, 0.8 mm zirconium ball, at a rotation speed of 1200 rpm for 40 min, and spray-dried to prepare submicron alumina.

[0047] Preparation Example 2

[0048] Take the submicron alumina in Preparation Example 1 and water in a ratio of 1:10 to obtain a suspension, add 5% by mass of aluminum sulfate and 20% by mass of ammonium carbonate to the suspension, stir and mix, adjust the pH to 9-10, ultrasonically disperse for 10 minutes, filter, retain the solid, wash with water and alcohol, dry, and calcine at 550°C for 4 hours to obtain coated alumina.

[0049] Preparation Example 3

[0050] Take submicron alumina and immerse it in PAANH 4 The solid was retained and dried to obtain treated alumina.

[0051] Silicon carbide fiber preparation example

[0052] Preparation Example 4

[0053] According to the mass fraction, 15% quartz, 20% alumina, 5% polyvinyl butyral and 1% castor oil are taken respectively, and the balance is supplemented with alcohol, and the quartz slurry is obtained by ball milling and dispersion. The quartz slurry is coated on the surface of the silicon carbide whisker, dried, and sintered at 1550°C to obtain the silicon carbide whisker coated with the quartz layer.

[0054] Preparation Example 5

[0055] According to the mass fraction, 15% quartz and 2% CaF 2 , 20% alumina, 5% polyvinyl butyral and 1% castor oil, and the balance is supplemented with alcohol, and ball milling is performed to obtain quartz slurry. The quartz slurry is coated on the surface of silicon carbide whiskers, dried, and sintered at 1550°C to obtain silicon carbide whiskers coated with a quartz layer.

[0056] Example

[0057] Examples 1-3

[0058] On the one hand, the present application provides a ceramic heating tube, comprising alumina, talc, calcium carbonate, silicon dioxide, zirconium oxide, PVB, DBP, castor oil and solvent, the specific mass of which is shown in Table 1, wherein the solvent comprises ethanol and butanone of equal mass; the D of alumina is 50 It is 3.4μm.

[0059] On the other hand, the present application provides a method for preparing a ceramic heating tube, comprising the following steps:

[0060] S1. Weighing raw materials: weigh alumina, talc, calcium carbonate, silicon dioxide, zirconium oxide, PVB, DBP, castor oil and solvent by weight, mix, and ball-mill at 30 r / s for 24 h to obtain a slurry;

[0061] S2, degassing treatment: use a vacuum pump to degas the slurry at 0.07 MPa for 30 minutes;

[0062] S3, tape casting: the deaerated slurry is placed on a tape casting machine at a speed of 10 m / min and a tape casting blade height of 1.0 mm for tape casting, molding, drying at 120°C, and cutting to obtain a molded product;

[0063] S4, printing and molding: printing tungsten paste heating circuit on the molded product, rolling the rod, molding, and obtaining a semi-finished product;

[0064] S5. Sintering and shipment: Place the semi-finished product in a container and sinter it at 1630°C for 36 hours, then inspect and ship it.

[0065] Table 1 Slurry composition of Examples 1-3

[0066] Weight / kg Example 1 Example 2 Example 3 Alumina 93 93.9 94 talcum powder 3 3.15 3.5 Calcium carbonate 1.5 1.8 2 Silicon dioxide 2 2.1 2.5 Zirconia 0.1 0.5 1 PVB 7 8 9 DBP 3 4 5 castor oil 1 1.5 2 Solvents 30 32 35

[0067] Example 4

[0068] The difference from Example 2 is that an equal mass of submicron alumina prepared in Preparation Example 1 is used to replace the alumina in Example 2 to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as those in Example 2.

[0069] Example 5

[0070] The difference from Example 2 is that an equal mass of submicron alumina prepared in Preparation Example 2 is used to replace the alumina in Example 2 to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as those in Example 2.

[0071] Example 6

[0072] The difference from Example 2 is that alumina includes equal masses of submicron alumina in Preparation Example 1, alumina in Preparation Example 2 and nano alumina to replace the alumina in Example 2 to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as Example 2.

[0073] Example 7

[0074] The difference from Example 2 is that 8 parts by weight of CMA particles are added to the raw materials to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as those in Example 2.

[0075] Example 8

[0076] The difference from Example 2 is that an equal mass of treated alumina prepared in Preparation Example 3 is used to replace the alumina in Example 2 to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as those in Example 2.

[0077] Example 9

[0078] The difference from Example 2 is that 1.5 parts by weight of silicon carbide whiskers are added to the raw materials to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as those in Example 2.

[0079] Example 10

[0080] The difference from Example 2 is that 1.5 parts by weight of silicon carbide whiskers prepared in Preparation Example 4 are added to the raw materials to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as those in Example 2.

[0081] Embodiment 11

[0082] The difference from Example 3 is that 1.5 parts by weight of silicon carbide whiskers prepared in Preparation Example 5 are added to the raw materials to prepare the ceramic heating tube, and the other preparation conditions and preparation environment are the same as those in Example 2.

[0083] Example 12

[0084] The difference from Example 2 is that in step S1, after the ball milling treatment, the slurry is screened and superconducting iron is removed to prepare the ceramic heating tube.

[0085] Comparative Example

[0086] Comparative Example 1

[0087] The difference between this comparative example and Example 3 is that a commercially available ceramic heating tube is used in this comparative example.

[0088] Performance testing

[0089] (1) Relative density test: Use the Archimedes drainage method to test the bulk density of the sample. Before the test, place the sample in a drying oven for 5 hours, wait for it to cool naturally to room temperature, and then place it on the top of the density tester to measure the dry weight of the ceramic in the air m1; then take out the sample and place it in the groove of the density tester immersed in deionized water to weigh the wet weight m2. Calculate the volume density of the sample according to the following formula ρ = m1 / (m1-m2)ρ 水 .

[0090] (2) Flexural strength performance test: The flexural strength of the sintered samples was tested by the three-point bending method.

[0091] (3) Power-on performance test.

[0092] Table 2 Performance test

[0093]

[0094]

[0095] Table 3

[0096]

[0097] Combining the performance test comparison in Table 2, we can find that:

[0098] 1. By comparing Examples 1-3 with Comparative Example 1, it can be found that the density and bending strength of the ceramic heating tubes prepared in Examples 1-3 are improved, which shows that the addition of silicon dioxide to the alumina substrate in the present application to promote the sintering of alumina can also effectively inhibit the growth rate of alumina grains and improve the mechanical strength of the ceramic heating tube. And at an appropriate addition amount, silicon dioxide can form a supercooled liquid phase to reduce the sintering temperature. In addition, the addition of zirconium oxide can effectively increase the toughness of ceramics by means of refinement, microcrack toughening, phase transformation toughening, crack steering and bifurcation, and reduce the possibility of ceramic fracture, thereby improving the strength and density of the ceramic heating tube.

[0099] 2. By comparing Example 4 with Example 2, it can be found that the density and bending strength of the ceramic heating tube prepared in Example 4 are improved, which means that the particle size of alumina is optimized in the present application, and while maintaining the fluidity of the slurry, the microstructure of the ceramic heating tube is made more uniform, thereby effectively improving the strength and density of the ceramic heating tube.

[0100] 3. By comparing Examples 5-6 with Example 2, it can be found that the density and bending strength of the ceramic heating tubes prepared in Examples 5-6 are improved. This shows that in the present application, the combination of micron alumina and nano alumina as the ceramic substrate can form a particle grading, and the gaps formed between the micron alumina particles are filled with nano alumina, thereby improving the density of the ceramic heating tube.

[0101] Since part of the nano-alumina is wrapped around the micron-alumina, firstly, the content of nano-alumina in the slurry can be reduced, and the possibility of nano-alumina agglomeration in the slurry can be reduced, so that the nano-alumina can be evenly dispersed in the slurry, and the ceramic heating tube can obtain uniform density and strength; secondly, under the coating of nano-alumina, the shape of the micron-alumina can be regularized, the combination effect of the micron-alumina and the other components in the slurry can be improved, and the pores formed between the micron-alumina particles can be reduced, thereby effectively improving the density and strength of the ceramic heating tube.

[0102] 4. By comparing Examples 7-8 with Example 2, it can be found that the density and bending strength of the ceramic heating tubes prepared in Examples 7-8 are improved, which means that by adding CMA particles in the present application, lamellar hexaaluminate is introduced into the ceramic substrate. The lamellar structure can increase the interpenetration strength between the components of the ceramic heating tube, and can consume fracture energy through particle extraction, crack deflection and bridging, that is, improve the strength of the ceramic heating tube. At the same time, CMA is easier to disperse in the alumina matrix and can fill the gaps between alumina particles. In addition, during the sintering process, since the sintering rate of CMA is lower than that of alumina, the dispersed flakes can serve as a spacer layer to inhibit the migration of grain boundaries, promote densification, and improve the density and strength of the ceramic heating tube.

[0103] 5. By comparing Examples 9-11 with Example 2, it can be found that the density and bending strength of the ceramic heating tubes prepared in Examples 9-11 are improved. This means that in the present application, a quartz layer is coated on the silicon carbide whisker, and the quartz layer can form a mullite layer on the surface of the silicon carbide after sintering. The introduction of the mullite crystal phase can effectively improve the strength of the silicon carbide whiskers, so that the silicon carbide whiskers can form a stable skeleton structure inside the ceramic heating tube, and can further improve the bonding effect between the silicon carbide whiskers and the remaining components in the ceramic heating tube, thereby improving the strength of the ceramic heating tube. At the same time, since mullite has good mechanical and electrical properties, adding it to the ceramic heating tube can effectively improve the thermal conductivity and electrical conductivity, and further improve the thermal conductivity of the ceramic heating tube. By CaF 2 The loading of nanoparticles can effectively improve the dispersion uniformity of silicon carbide whiskers in the slurry, thereby improving the strength of the ceramic heating tube.

[0104] 6. By comparing Example 12 with Example 2, it can be found that the density and bending strength of the ceramic heating tube prepared in Example 12 are improved, which means that superconducting iron removal of the slurry in the present application can effectively remove ferromagnetic impurities in the slurry, reduce the possibility of cloud spots on the ceramic heating tube, make the ceramic heating tube uniform in color, and make the product translucent.

[0105] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A ceramic heating tube, characterized in that: The following materials are included in parts by weight: Aluminum oxide 93-94 parts; 3-3.5 parts of talcum powder; 1.5-2 parts calcium carbonate; 2-2.5 parts of silicon dioxide; Zirconium oxide 0.1-1 part; PVB 7-9 parts; DBP 3-5 parts; 1-2 parts castor oil; 30-35 parts of solvent.

2. A ceramic heating tube according to claim 1, characterized in that: The alumina includes micron alumina, and the particle size of the micron alumina is 0.8-4 μm.

3. A ceramic heating tube according to claim 2, characterized in that: The alumina also includes nano alumina, part of which is wrapped in the micron alumina to form coated alumina. The preparation of the coated alumina includes the following steps: mixing the micron alumina with water to obtain a suspension, adding aluminum sulfate and ammonium carbonate to the suspension, continuing stirring, adjusting the pH, ultrasonically dispersing, filtering, retaining solids, washing, drying, and roasting to obtain coated alumina.

4. The ceramic heating tube according to claim 1, characterized in that: Also includes 5-10 parts by weight of CMA (CeMgAl 11 O 19 ) particles.

5. The ceramic heating tube according to claim 1, characterized in that: The alumina is alumina treated with PAANH4.

6. The ceramic heating tube according to claim 1, characterized in that: Also included are 1-2 parts of silicon carbide whiskers.

7. The ceramic heating tube according to claim 6, characterized in that: The silicon carbide whiskers are coated with a quartz layer.

8. The ceramic heating tube according to claim 6, characterized in that: The silicon carbide whiskers are loaded with CaF2 nanoparticles.

9. A method for preparing a ceramic heating tube according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Weighing raw materials: weighing alumina, talc, calcium carbonate, silicon dioxide, zirconium oxide, PVB, DBP, castor oil and solvent by weight, mixing, and ball milling to obtain slurry; S2, degassing treatment: using a vacuum pump to degas the slurry; S3, tape casting: placing the deaerated slurry on a tape casting machine for tape casting, molding, drying, cutting, and obtaining a molded product; S4, printing and molding: printing tungsten paste heating circuit on the molded product, rolling the rod, molding, and obtaining a semi-finished product; S5. Sintering and shipment: Place the semi-finished products in containers for sintering, inspection and shipment.

10. The method for preparing a ceramic heating tube according to claim 9, characterized in that: In step S1, after ball milling, the slurry is screened to remove iron.

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