Ceramic tube manufacturing method, ceramic tube and aerosol generating device

Abstract

The present application discloses a method for manufacturing a ceramic tube, the method comprising: forming a ceramic tube blank on the outer periphery of a rod-shaped forming piece, and forming an integral structure with the rod-shaped forming piece, wherein the rod-shaped forming piece is made of a material that can be burned out when the burning-out temperature is reached under a first gas condition; sintering the integral structure formed by the ceramic tube blank and the rod-shaped forming piece at a first temperature under a second gas condition, so as to sinter the ceramic tube blank into porcelain, and obtain a ceramic tube assembly integrally combined with the rod-shaped forming piece; and sintering the ceramic tube assembly at a second temperature under the first gas condition, so as to burn out the rod-shaped forming piece, and obtain the ceramic tube, wherein the second temperature is lower than the first temperature and greater than or equal to the burning-out temperature. The present application also provides a ceramic tube made according to the manufacturing method and an aerosol generating device including the ceramic tube. The present application can manufacture a ceramic tube with a high-precision inner diameter at a relatively low cost.

Description

Technical Field

[0001] The present invention relates to the field of ceramic tube processing, and in particular to a method for manufacturing a ceramic tube used in an aerosol generating device, a ceramic tube obtained according to the manufacturing method, and an aerosol generating device having the ceramic tube. Background Art

[0002] With the advancement of science and technology and the improvement of people's demand for quality of life, aerosol generating devices that generate aerosols by heating traditional cigarettes and other tobacco products have gradually come out. They mainly generate aerosols including nicotine and other components by heating traditional cigarettes and other tobacco products to atomize nicotine and other components. The aerosol generating device in the related art can achieve a taste close to that of ordinary cigarettes when they are burned to a certain extent, and because this method does not require the burning of tobacco products, it can effectively reduce the harm of smoking and pollution to the environment. In the aerosol generating device of the related art, a ceramic tube is set to accommodate traditional cigarettes and other tobacco products, and a heating element is set in the ceramic tube to heat the tobacco products. Usually, the inner diameter of the ceramic tube needs to be set to match the outer diameter of the traditional cigarette in order to well achieve the fixation and heating of the traditional cigarette.

[0003] However, the manufacturing process of ceramic tubes in the related art is to form first, then demold and sinter separately into porcelain. The shrinkage ratio of ceramics during sintering is high, and the inner diameter of the ceramic tube product is deformed by factors such as the temperature of the sintering furnace, airflow, and shrinkage rate of raw materials, resulting in low precision of the inner diameter of the finished porcelain; moreover, the inner diameter size in the related art is determined by the mold size, and the size of the inner diameter during molding is determined according to the dimensional accuracy of the mold. The size of the final fired ceramic tube will be affected by the pick-and-place operation during demolding, and the tolerance range is large. It is necessary to use machining or internal grinding to ensure the ceramic tolerance in the later stage, resulting in low yield and high process cost. Summary of the invention

[0004] The embodiment of the present invention provides a method for manufacturing a ceramic tube, which can effectively improve the dimensional accuracy of the ceramic tube through a relatively low-cost process.

[0005] On the one hand, an embodiment of the present invention provides a method for manufacturing a ceramic tube, the method comprising the following steps: S1: forming a ceramic tube blank on the outer periphery of a rod-shaped forming piece, and forming an integral structure with the rod-shaped forming piece, wherein the rod-shaped forming piece is made of a material that can be burned out when the burn-out temperature is reached under a first gas condition; S2: sintering the integral structure formed by the ceramic tube blank and the rod-shaped forming piece at a first temperature under a second gas condition, so as to sinter the ceramic tube blank into porcelain, and obtain a ceramic tube assembly integrally combined with the rod-shaped forming piece; and S3: sintering the ceramic tube assembly at a second temperature under the first gas condition, so as to burn out the rod-shaped forming piece, and obtain the ceramic tube, wherein the second temperature is lower than the first temperature and greater than or equal to the burn-out temperature.

[0006] On the other hand, an embodiment of the present invention provides a ceramic tube, which is made according to a ceramic tube manufacturing method, the method comprising the following steps: S1: forming a ceramic tube blank on the outer periphery of a rod-shaped forming piece, and forming an integral structure with the rod-shaped forming piece, wherein the rod-shaped forming piece is made of a material that can be burned out when the burn-out temperature is reached under a first gas condition; S2: sintering the integral structure formed by the ceramic tube blank and the rod-shaped forming piece at a first temperature under a second gas condition, so as to sinter the ceramic tube blank into porcelain, and obtain a ceramic tube assembly integrally combined with the rod-shaped forming piece; and S3: sintering the ceramic tube assembly at a second temperature under the first gas condition, so as to burn out the rod-shaped forming piece, and obtain the ceramic tube, wherein the second temperature is lower than the first temperature and greater than or equal to the burn-out temperature.

[0007] On the other hand, an embodiment of the present invention further provides an aerosol generating device, which includes a ceramic tube, and the ceramic tube is manufactured according to a ceramic tube manufacturing method, the method comprising the following steps: S1: forming a ceramic tube blank on the outer periphery of a rod-shaped forming piece, and forming an integral structure with the rod-shaped forming piece, wherein the rod-shaped forming piece is made of a material that can be burned out when the burn-out temperature is reached under a first gas condition; S2: sintering the integral structure formed by the ceramic tube blank and the rod-shaped forming piece at a first temperature under a second gas condition, so as to sinter the ceramic tube blank into porcelain, and obtain a ceramic tube coupling piece integrally combined with the rod-shaped forming piece; and S3: sintering the ceramic tube coupling piece at a second temperature under the first gas condition, so as to burn out the rod-shaped forming piece, and obtain the ceramic tube, wherein the second temperature is lower than the first temperature and greater than or equal to the burn-out temperature.

[0008] The manufacturing method of the ceramic tube of the embodiment of the present application, and the ceramic tube made according to the manufacturing method of the ceramic tube and the aerosol generating device including the ceramic tube, by providing the rod-shaped shaping piece, forming the ceramic tube blank on the outer periphery of the rod-shaped shaping piece for sintering, and after the ceramic tube blank is sintered into porcelain, the rod-shaped shaping piece is burned away, and the inner diameter of the ceramic tube can be effectively shaped by the rod-shaped shaping piece during the sintering of the ceramic tube blank into porcelain, effectively avoiding the problem of low precision of the inner diameter after porcelain formation caused by the internal shrinkage of the ceramic tube during the sintering process in the prior art. In addition, since only the rod-shaped shaping piece with high outer diameter precision is required, the manufacturing cost is low. Therefore, according to the manufacturing method of the ceramic tube of the present application, a ceramic tube with a high-precision inner diameter can be manufactured at a low manufacturing cost, and the precision of the inner diameter of the ceramic tube can be effectively improved, thereby improving the performance of the aerosol generating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other deformation methods can be obtained based on these drawings without paying creative work.

[0010] Figure 1 The present invention is a flowchart of a method for manufacturing a ceramic tube in some embodiments of the present application.

[0011] Figure 2 In some embodiments of this application Figure 1 Sub-flow chart of step S2 in .

[0012] Figure 3 In some embodiments of this application Figure 2 A further sub-flow chart of step S21 in .

[0013] Figure 4 This is a sintering data diagram in an embodiment of the present application.

[0014] Figure 5 In some embodiments of this application Figure 1 Sub-flow chart of step S3 in .

[0015] Figure 6 In some embodiments of this application Figure 5 A further sub-flow chart of step S31 in .

[0016] Figure 7 This is another sintering data diagram in one embodiment of the present application.

[0017] Figure 8 For this application Figure 1 A sub-flow chart of step S1 in one embodiment.

[0018] Fig. 9 It is a schematic diagram of an integrated structure formed by a ceramic tube blank and the rod-shaped forming member in an embodiment of the present application.

[0019] Fig.10 For this application Figure 1 A sub-flowchart of step S1 in another embodiment.

[0020] Fig.11 This is a schematic diagram showing the internal structure of an integrated structure formed by a ceramic tube blank and the rod-shaped forming member in another embodiment of the present application.

[0021] Fig.12 This is a schematic diagram of a ceramic tube obtained by burning out the rod-shaped shaped piece in some embodiments of the present application.

[0022] Fig.13 For this application Figure 1 Step S1 in a sub-flow chart in yet another embodiment.

[0023] Fig.14 This is a schematic diagram of two cast substrates during the winding process in one embodiment of the present application.

[0024] Fig.15 The present invention further provides a flow chart of a method for manufacturing a ceramic tube in some embodiments of the present application.

[0025] Fig.16 In one embodiment of the present application Fig.15 Sub-flow chart of step S4 in .

[0026] Fig.17 In some embodiments of this application Fig.16 The sub-flow chart of step S41 in

[0027] Fig.18 This is a data diagram of the wax removal and degreasing process in one embodiment of the present application.

[0028] Fig.19 Schematic diagram of ceramic tubes in other embodiments of the present application.

[0029] Fig. 20 Schematic diagram of the simple structure of an aerosol generating device in one embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The step numbers corresponding to the various steps in the present application, such as S1, S2, etc., are only for the convenience of description. The step names are not used to limit the execution order of the steps, and other steps may be included between adjacent steps, and other steps may be included before or after any step.

[0032] See also Figure 1 , is a flow chart of a method for manufacturing a ceramic tube in some embodiments of the present application. The method for manufacturing the ceramic tube is not limited to Figure 1 The sequence shown in FIG. 1 is the same as that shown in FIG. 1 , and other steps may be included between adjacent steps. Figure 1 As shown, the manufacturing method of the ceramic tube comprises the following steps:

[0033] S1: forming a ceramic tube blank on the outer periphery of a rod-shaped forming member and forming an integral structure with the rod-shaped forming member, wherein the rod-shaped forming member is made of a material that can be burned out at a burning-out temperature under a first gas condition.

[0034] S2: Sintering the integrated structure formed by the ceramic tube blank and the rod-shaped forming piece at a first temperature under a second gas condition to sinter the ceramic tube blank into porcelain, thereby obtaining a ceramic tube assembly integrally combined with the rod-shaped forming piece.

[0035] S3: Under the first gas condition, sintering the ceramic tube assembly at a second temperature to burn out the rod-shaped forming member to obtain the ceramic tube, wherein the second temperature is lower than the first temperature and greater than or equal to the burn-out temperature.

[0036] Therefore, in the present application, by providing the rod-shaped shaping piece, the ceramic tube blank is formed on the outer periphery of the rod-shaped shaping piece for sintering, and after the ceramic tube blank is sintered into porcelain, the rod-shaped shaping piece is burned away, so that during the process of sintering the ceramic tube blank into porcelain, the inner diameter of the ceramic tube can be effectively shaped by the rod-shaped shaping piece, and the problem of low precision of the inner diameter after porcelain formation caused by internal shrinkage of the ceramic tube during the sintering process in the prior art is effectively avoided. In addition, since only the rod-shaped shaping piece with high outer diameter precision needs to be provided, the manufacturing cost is low. Therefore, according to the manufacturing method of the ceramic tube of the present application, a ceramic tube with a high-precision inner diameter can be manufactured at a low manufacturing cost.

[0037] See also Figure 2 , for some embodiments of this application Figure 1 Sub-flow chart of step S2 in . In some embodiments, the first temperature is within 600°C-900°C, that is, the first temperature can be any temperature value within the temperature range of greater than or equal to 600°C and less than or equal to 900°C. The step S2 comprises: S21: sintering the integrated structure formed by the ceramic tube blank and the rod-shaped forming member at the first temperature under the second gas condition, and keeping the temperature for 15-300 minutes to sinter the ceramic tube blank into porcelain, and obtain a ceramic tube combination integrally combined with the rod-shaped forming member.

[0038] Please also read Figure 3 as well as Figure 4 , Figure 3 In some embodiments of this application Figure 2 A further sub-flow chart of step S21 in . Figure 4 FIG. 1 is a sintering data diagram in an embodiment of the present application. Figure 3 As shown, the step S21 includes:

[0039] S211: performing a first-stage sintering on the integrated structure formed by the ceramic tube blank and the rod-shaped forming member, wherein, during a first duration of the first stage, the sintering temperature is increased to a first preset temperature at a first preset heating rate.

[0040] S212: performing a second-stage sintering on the integrated structure formed by the ceramic tube blank and the rod-shaped forming piece, wherein during a second duration of the second stage, the sintering temperature is maintained at the first preset temperature to sinter the ceramic tube blank into porcelain, thereby obtaining a ceramic tube assembly integrally combined with the rod-shaped forming piece.

[0041] The second gas condition includes at least one of a vacuum environment, a neutral atmosphere environment and a reducing atmosphere environment. That is, the gas condition for sintering in step S2 can be a vacuum environment, a neutral atmosphere environment, a reducing atmosphere environment and the like.

[0042] In some embodiments, Figure 4 As shown, the first duration of the first stage may be 3 hours, the first preset heating rate may be 5°C / min (5 degrees Celsius / minute), the first preset temperature may be 900°C, and the second duration of the second stage may be 2 hours. Specifically, in the first stage, the temperature may be raised from room temperature, such as 25°C, until it reaches the preset temperature, such as 900°C. The first duration and the second duration are Figure 4 The corresponding accumulated time shown in .

[0043] That is, in some embodiments, the first temperature in step S21 may be the first preset temperature reached by rising at a first preset heating rate, and the aforementioned integral structure formed by the ceramic tube blank and the rod-shaped forming member is sintered at a first temperature under the second gas condition, and kept warm for 15-300min (minutes), which can also be understood as: the integral structure formed by the ceramic tube blank and the rod-shaped forming member is raised at a first preset heating rate under the second gas condition until the first preset temperature, that is, the first temperature, is reached, and kept warm at the first preset temperature for 15-300min. Specifically, the holding time, that is, the aforementioned second duration, can be 2h, that is, 120min. Obviously, the holding time can also be any value in 15-300min. Among them, as mentioned above, the first preset temperature, that is, the first temperature can also be any value in 600℃-900℃, for example, it can also be 600℃, 800℃ and other temperature values.

[0044] Wherein, the sintering of the integrated structure formed by the ceramic tube blank and the rod-shaped forming part is carried out in a sintering furnace under the second gas condition, and the sintering temperature may specifically be the internal temperature of the sintering furnace, and the aforementioned control of the sintering temperature may be achieved by controlling the internal temperature of the sintering furnace. For example, the step S211 may further include: controlling the temperature of the sintering furnace to rise to a first preset temperature at a first preset heating rate within a first time period, and performing a first stage of sintering on the integrated structure formed by the ceramic tube blank and the rod-shaped forming part. The step S212 may further include: controlling the temperature of the sintering furnace to maintain the first preset temperature within a second time period, and performing a second stage of sintering on the integrated structure formed by the ceramic tube blank and the rod-shaped forming part. Thus, the ceramic tube blank is sintered into porcelain, and a ceramic tube combination integrally combined with the rod-shaped forming part is obtained.

[0045] See also Figure 5 , for some embodiments of this application Figure 1 The sub-flow chart of step S3 in . The second temperature is within 400°C-700°C, that is, the second temperature can be any temperature value within the temperature range of greater than or equal to 450°C and less than or equal to 700°C. The step S3 comprises: S31: under the first gas condition, sintering the ceramic tube assembly at the second temperature and keeping the temperature for 15-300 minutes to burn out the rod-shaped shaping piece to obtain the ceramic tube.

[0046] Please also read Figure 6 as well as Figure 7 , Figure 6 In some embodiments of this application Figure 5 A further sub-flow chart of step S31 in . Figure 7 FIG. 2 is another sintering data diagram in one embodiment of the present application. Figure 6 As shown, the step S31 includes:

[0047] S311: performing a first-stage sintering on the ceramic tube assembly, wherein, during a third duration of the first stage, the sintering temperature is increased to a second preset temperature at a second preset heating rate.

[0048] S312: performing a second-stage sintering on the ceramic tube assembly, wherein, during a fourth time period of the second stage, the sintering temperature is maintained at the second preset temperature to burn out the rod-shaped forming member to obtain the ceramic tube.

[0049] The first gas condition includes an oxygen environment, that is, the gas condition for sintering in step S3 may be an oxygen environment.

[0050] In some embodiments, Figure 7 As shown, the third duration of the first stage may be 3 hours, the second preset heating rate may be 4°C / min (4 degrees Celsius / minute), the second preset temperature may be 700°C, and the fourth duration of the second stage may be 2 hours. Specifically, in the first stage, the temperature may be raised from room temperature, such as 25°C, until it rises to the second preset temperature, such as 700°C. The third duration and the fourth duration are Figure 4 The corresponding accumulated time shown in .

[0051] That is, in some embodiments, the second temperature in step S31 may be the second preset temperature reached by increasing at a second preset heating rate. The aforementioned sintering of the ceramic tube assembly at the second temperature and keeping it warm for 15-300 minutes under the first gas condition can be understood as: under the first gas condition, the integrated structure formed by the ceramic tube blank and the rod-shaped forming member is increased at a second preset heating rate until the second preset temperature is reached, and kept warm at the second preset temperature for 15-300 minutes. Specifically, as mentioned above, the insulation time, that is, the fourth time length, can be 2 hours, that is, 120 minutes. Obviously, the insulation time can also be any value between 15-300 minutes. As mentioned above, the second preset temperature, that is, the second temperature can also be any value within 450°C-700°C.

[0052] Wherein, the sintering of the ceramic tube assembly is carried out in a sintering furnace under the first gas condition, and the sintering temperature may specifically be the internal temperature of the sintering furnace, and the control of the sintering temperature may be achieved by controlling the internal temperature of the sintering furnace. For example, the step S311 may further include: controlling the temperature of the sintering furnace to rise to a second preset temperature at a second preset heating rate within a third time period, and performing the first stage of sintering on the ceramic tube assembly. The step S212 may further include: controlling the temperature of the sintering furnace to maintain the second preset temperature within a fourth time period, and performing the second stage of sintering on the ceramic tube assembly.

[0053] In some embodiments, the ceramic tube assembly has a burnout temperature of 400°C or more in step S1, that is, greater than or equal to 400°C. As mentioned above, the first gas condition includes an aerobic environment. Thus, the rod-shaped shaped member can be made of a material that can be burnout when the temperature reaches 400°C or more in an aerobic environment.

[0054] As mentioned above, in some embodiments, when the ceramic tube assembly is sintered, the rod-shaped forming piece can be effectively burned away by controlling the temperature to a maximum of 700°C. At this time, since the temperature is lower than the temperature that will cause the ceramic tube to deform, it is ensured that the ceramic tube will not be deformed during the process of burning away the rod-shaped forming piece, thereby ensuring the dimensional accuracy of the ceramic tube.

[0055] In some embodiments, the second preset temperature may also be a smaller value such as 500° C. to further avoid deformation of the ceramic tube.

[0056] As mentioned above, the second gas condition includes at least one of a vacuum environment, a neutral atmosphere environment, and a reducing atmosphere environment. In some embodiments, the second gas condition may also be referred to as a gas condition of an oxygen-free environment.

[0057] See also Figure 8 , for this application Figure 1 A sub-flow chart of step S1 in one embodiment. Figure 8 As shown, the step S1 includes:

[0058] S111: placing a rod-shaped shaping piece in a forming mold, wherein the rod-shaped shaping piece and an inner wall of a shell of the forming mold form an annular columnar space.

[0059] S112: Injecting ceramic slurry into the annular columnar space to form a ceramic tube blank, and forming an integral structure with the rod-shaped forming piece.

[0060] Wherein, the shell of the forming mold may include a cylindrical hollow shell, and one end of the shell is closed and the other end has an opening, the rod-shaped shaping piece may also be a cylindrical rod, and the rod-shaped shaping piece may be fixed at the center position of the cylindrical shell, and the rod-shaped shaping piece and the shell have a common central axis, and the outer diameter of the rod-shaped shaping piece is smaller than the inner diameter of the shell, so that the rod-shaped shaping piece and the inner wall of the shell of the forming mold form an annular columnar space. By injecting ceramic slurry into the annular columnar space to form a ceramic tube blank, the ceramic slurry can be formed according to the outer diameter of the rod-shaped shaping piece as the inner diameter, and the outer diameter of the rod-shaped shaping piece can be accurately controlled in advance to obtain the precise inner diameter of the ceramic tube blank. Correspondingly, by accurately controlling the inner diameter of the shell of the forming mold, the precise outer diameter of the ceramic tube blank can be obtained.

[0061] Among them, since the ceramic slurry is viscous at high temperature, it can be tightly bonded to the rod-shaped forming member. When the slurry is cooled, it will be tightly fixed together with the rod-shaped forming member to form an integrated structure.

[0062] Wherein, the outer diameter and cross-sectional shape of the rod-shaped shaping piece can be determined according to the inner diameter of the ceramic tube to be manufactured and the cross-sectional shape of the hollow through hole in the ceramic tube. In some embodiments, the rod-shaped shaping piece is a cylindrical rod, and the hollow through hole in the ceramic tube is a cylindrical through hole, and the cross-sections are all circular. Obviously, in other embodiments, other shapes are also possible. Correspondingly, the inner diameter and cross-sectional shape of the shell of the forming mold can also be determined according to the outer diameter of the ceramic tube to be manufactured and the peripheral shape of the ceramic tube. Wherein, the cross-sections of the rod-shaped shaping piece and the shell of the forming mold are both planes perpendicular to their central axis.

[0063] See also Fig. 9 , is a schematic diagram of an integrated structure formed by a ceramic tube blank and the rod-shaped forming member in an embodiment of the present application. Fig. 9 As shown, the integrated structure J1 formed by the ceramic tube blank and the rod-shaped forming member includes a ceramic tube blank J11 and a rod-shaped forming member J12. Fig. 9 As shown, in some embodiments, the ceramic tube body J11 is a hollow tube, and the rod-shaped forming member J12 is a cylindrical rod-shaped forming member. The ceramic tube body J11 is wrapped around the outer circumference of the rod-shaped forming member J12, and the inner diameter of the ceramic tube body J11 is the outer diameter of the rod-shaped forming member J12, and the ceramic tube body J11 and the rod-shaped forming member J12 share a central axis.

[0064] The structure of the integrated structure J1 formed by the ceramic tube blank and the rod-shaped forming member is basically the same as that of the ceramic tube assembly, except that the integrated structure J1 formed by the ceramic tube blank J11 and the rod-shaped forming member J12 is sintered into porcelain to obtain the ceramic tube assembly. Fig. 9 The schematic diagram shown can also be regarded as a schematic diagram of a ceramic tube assembly.

[0065] Among them, Fig. 9 As shown, the length of the rod-shaped shaping member J12 may be greater than the length of the ceramic tube body J11, so that the portion of the rod-shaped shaping member J12 protruding from the ceramic tube body J11 is conveniently positioned in the receiving portion corresponding to the forming mold. The lengths of the rod-shaped shaping member J12 and the ceramic tube body J11 refer to the dimensions of the rod-shaped shaping member J12 and the ceramic tube body J11 along their central axis directions.

[0066] Among them, when the ceramic slurry is injected into the annular columnar space to form a ceramic tube blank, since a portion of one end of the rod-shaped shaping piece J12 will be positioned in the receiving portion corresponding to the forming mold, it will not be wrapped by the ceramic slurry, and after the ceramic slurry is injected into the annular columnar space, the other end of the rod-shaped shaping piece J12 can be higher than the position of the ceramic slurry, so that the final formed ceramic tube blank J11 and the rod-shaped shaping piece J12 form an integrated structure J1. Fig. 9 The structure shown is that the opposite ends of the rod-shaped shaping member J12 extend to the outside of the ceramic tube body J11.

[0067] See also Fig.10 , for this application Figure 1 A sub-flow chart of step S1 in another embodiment. Fig.10 As shown, the step S1 includes:

[0068] S111: placing a rod-shaped shaping piece in a forming mold, wherein the rod-shaped shaping piece and an inner wall of a shell of the forming mold form an annular columnar space.

[0069] S113: Arrange a heating element on the outer periphery of the rod-shaped shaping element.

[0070] S112: injecting ceramic slurry into the annular columnar space and combining it with the heating element to form a ceramic tube blank, and forming an integral structure with the rod-shaped forming element.

[0071] That is, compared to Figure 8 The flowchart shown in Fig.10In the embodiment, before step S112, step S1 further includes: S113: arranging the heating element on the outer periphery of the rod-shaped forming element. And step S112 may specifically include: injecting ceramic slurry into the annular columnar space to combine with the heating element to form a ceramic tube blank, and forming an integral structure with the rod-shaped forming element. That is, Figure 8 In step S112 of the method, the step of injecting ceramic slurry into the annular columnar space to form a ceramic tube blank may specifically include: injecting ceramic slurry into the annular columnar space and combining the ceramic tube blank with the heating element to form a ceramic tube blank.

[0072] Therefore, in some embodiments, the ceramic tube finally formed may be an integrated structure including a heating element and a ceramic tube body. Therefore, the ceramic tube can be used to accommodate tobacco products, directly heat the tobacco products, and perform heat insulation.

[0073] Obviously, in some embodiments, the finally formed ceramic tube may not include the heating element, that is, only Figure 8 The steps shown in the figure do not include step S113, and step S112 may only include injecting ceramic slurry into the annular columnar space to form a ceramic tube blank. Thus, the ceramic tube finally formed can only be used to accommodate tobacco products, and after the tobacco products are heated by the additional heating element, the tobacco products are kept warm and insulated.

[0074] Among them, since the slurry is high-temperature viscous, it can be tightly bonded with the heating element and the rod-shaped forming piece. When the slurry is cooled, it will combine with the heating element to form a ceramic tube blank and form an integrated structure with the rod-shaped forming piece.

[0075] In some embodiments, the heating element may be a metal wire wound around the outer periphery of the rod-shaped forming element, that is, the step S113: arranging the heating element around the outer periphery of the rod-shaped forming element may include: winding the metal wire around the outer periphery of the rod-shaped forming element. Thus, after the ceramic tube blank is formed, the heating element is located on the inner surface of the ceramic tube blank, and after the ceramic tube is finally sintered to obtain the ceramic tube, the heating element will also be located on the inner surface of the hollow ceramic tube.

[0076] See also Fig.11 , is a schematic diagram showing the internal structure of an integrated structure formed by a ceramic tube blank and the rod-shaped forming member in another embodiment of the present application. Fig.11 As shown, the integrated structure J1 formed by the ceramic tube blank and the rod-shaped forming member includes a ceramic tube blank J11 and a rod-shaped forming member J12, and also includes a heating member 11. Fig.11As shown, the heating element 11 is a mesh structure and is roughly located between the ceramic tube body J11 and the rod-shaped shaping member J12. The heating element 11 surrounds the rod-shaped shaping member J12 and completely covers the inner wall of the ceramic tube body J11. That is, in some embodiments, the heating element 11 is a mesh structure and can be distributed at various positions inside the tube body 101 of the ceramic tube 10. The heating element can be made of iron, copper, silver or other heat-conducting metals or alloys.

[0077] Among them, Fig.11 As shown, the heating element 11 also includes two poles 111, and the two poles 111 extend from one end of the ceramic tube 10, wherein the two poles 111 may include positive and negative poles, and are used to connect with a power module (not shown in the figure) to obtain electrical energy provided by the power module, so that the heating element 11 is powered on and generates heat.

[0078] in, Fig.11 The structure of the integrated structure J1 formed by the ceramic tube blank and the rod-shaped forming member is basically the same as that of the ceramic tube combination member, except that the integrated structure J1 formed by the ceramic tube blank and the rod-shaped forming member is sintered into porcelain to obtain the ceramic tube combination member. Fig.11 The schematic diagram shown can also be regarded as a schematic diagram of a ceramic tube combination in another embodiment.

[0079] See also Fig.12 , is a schematic diagram of a ceramic tube obtained by burning out the rod-shaped shaped piece in some embodiments of the present application. Fig.12 For Fig.11 The schematic diagram of the ceramic tube 10 obtained by sintering the integral structure formed by the ceramic tube blank and the rod-shaped forming piece is shown.

[0080] like Fig.12 As shown, the heating element 11 of the mesh structure is arranged on the inner wall of the tube body 101 of the hollow ceramic tube 10, and the heating element 11 can completely cover the inner wall of the tube body 101 of the ceramic tube 10. That is, in some embodiments, the heating element 11 is a mesh structure and can be distributed at various positions inside the tube body 101 of the ceramic tube 10. Among them, the heating element can be a mesh structure composed of metal wires. The metal wires can be iron, copper, silver or other heat-conducting metals or alloys.

[0081] As mentioned above, the heating element 11 also includes two poles 111, which extend from one end of the ceramic tube 10 and are used to connect to the positive and negative poles of a power module (not shown in the figure) to obtain the electrical energy provided by the power module, so that the heating element 11 is powered on and generates heat.

[0082] In some embodiments, when the ceramic tube 10 does not include the heating element 11, the ceramic tube 10 only includes the tube body 101, which is only used to accommodate tobacco products, and to keep the tobacco products warm after the additional heating element heats the tobacco products.

[0083] In some embodiments, before step S112, the method may further include the step of: processing to form the ceramic slurry.

[0084] In some embodiments, the processing to form the ceramic slurry may include: kneading the ceramic powder and the binder to form a wax cake; and dissolving the wax cake into the flowable slurry by injection molding or pressure casting.

[0085] That is, in some embodiments, specifically, the ceramic powder and the binder are first kneaded to form a wax cake, and then the wax cake is dissolved by injection molding or die casting to prepare the flowable slurry.

[0086] The wax cake refers to a solid substance formed by bonding the ceramic powder particles and the binder through kneading, but the shape is not limited to a cake, and may be a sphere, a square, an irregular shape, and the like.

[0087] In some embodiments, the binder may include at least one of paraffin, beeswax, stearic acid, etc.

[0088] Wherein, the ceramic powder is granular powder of ceramic material.

[0089] In some embodiments, the ratio of the ceramic powder to the binder may be 6:4, where the ceramic powder particles account for 6 and the binder accounts for 4. The ratio may be a mass ratio.

[0090] In some embodiments, the forming of a wax cake by kneading the ceramic powder and the binder may also specifically include: bonding the ceramic powder with glass powder to form a bonded ceramic powder in which the ceramic powder particles are bonded to each other, and then mixing the bonded ceramic powder with the binder and forming a wax cake by kneading.

[0091] That is, in some embodiments, the ceramic powder and the glass powder may be bonded first to form a bonded ceramic powder in which ceramic particles are bonded to each other, and then the bonded ceramic powder and the binder are mixed and kneaded to form a wax cake.

[0092] Wherein, the ratio of the ceramic powder to the glass powder may be 4:1, wherein the ceramic powder accounts for 4 and the glass powder accounts for 1. The ratio may be a mass ratio. The ratio of the bonding ceramic powder to the binder may be 6:4, wherein the bonding ceramic powder accounts for 6 and the binder accounts for 4. The ratio may be a mass ratio. Obviously, the above ratios are only examples and are not actually limited to the above ratios. For example, the ratio of the ceramic powder to the glass powder may be 5:1, and the ratio of the bonding ceramic powder to the binder may be 7:3, and so on.

[0093] In some embodiments, the forming of the wax cake by internal mixing may include: forming the wax cake by internal mixing in an internal mixer. That is, the internal mixing may be completed by an internal mixer. In some embodiments, the injection molding may be achieved by injection molding by an injection machine, and the die casting and dissolving may be achieved by die casting molding by a hot die casting machine.

[0094] Please also read Fig.13 as well as Fig.14 , Fig.13 For this application Figure 1 In a sub-flow chart of step S1 in yet another embodiment, Fig.14 FIG. 1 is a schematic diagram of two cast substrates in the process of winding in one embodiment of the present application. Fig.13 As shown, the step S1 includes:

[0095] S121: Rolling the first unprinted cast substrate onto a rod-shaped molding member.

[0096] S122: Printing a heating circuit on the second casting substrate, and rolling the second casting substrate printed with the heating circuit on the first casting substrate without printing.

[0097] S123: fusing the first cast substrate and the second cast substrate to obtain the ceramic tube blank formed on the outer periphery of the rod-shaped forming member and forming an integral structure with the rod-shaped forming member.

[0098] Among them, Fig.14 As shown in FIG. 1 , the rod-shaped shaping member J12 is firstly rolled with a first cast substrate J13 without printing, and then a second cast substrate J14 printed with a heating circuit C1 is rolled on the first cast substrate J13 without printing, thereby obtaining Fig.14 The rolled state is shown.

[0099] The term "no printing" means that no circuit structure is printed, and the circuit structure includes structures such as wiring, metal wires, etc. The heating circuit C1 may include the aforementioned heating element 11, that is, including structures such as metal wires and poles.

[0100] Thus, in some other embodiments, the ceramic tube blank is formed on the outer periphery of the rod-shaped forming piece and forms an integral structure with the rod-shaped forming piece, specifically, a first unprinted cast substrate and a second cast substrate layer printed with a heating circuit are sequentially rolled onto the rod-shaped forming piece, and this is achieved by fusing the first cast substrate and the second cast substrate.

[0101] In some embodiments, the fusion treatment of the first cast substrate and the second cast substrate may include: wrapping the second cast substrate printed with a heating circuit on the first cast substrate without printing to obtain a rolled rod-shaped shaped piece into a heat shrink tube; after evacuating and heat-shrinking the heat shrink tube, the rolled rod-shaped shaped piece wrapped with the heat shrink tube is placed in an isostatic pressing device for static pressing treatment, so that the first cast substrate and the second cast substrate are fused.

[0102] The static pressure treatment includes: maintaining the pressure for 50 to 2000 seconds under the conditions of a system pressure of 5 to 30 MPa (megapascal) and a static pressure temperature of 30 to 100° C. of the static pressure equipment.

[0103] After the static pressure treatment is completed, the heat shrinkable sleeve and the rolled rod-shaped forming part are peeled off to obtain an integrated structure of the ceramic tube blank and the rod-shaped forming part.

[0104] The first cast substrate and the second cast substrate can also be made of a mixture of ceramic powder and a binder, wherein the binder includes at least one of paraffin wax, beeswax, stearic acid, etc. The first cast substrate and the second cast substrate are flexible and sticky, so that the unprinted first cast substrate can be stably rolled on the rod-shaped shaping member, and the second cast substrate printed with a heating circuit can also be stably rolled on the unprinted first cast substrate.

[0105] Among them, through Fig.13 When the ceramic tube blank and the rod-shaped shaped member are obtained in an integrated structure in the manner shown, the ceramic tube finally formed is an integrated structure including the heating element and the ceramic tube body. Specifically, it can be the aforementioned Fig.12 The ceramic tube shown comprises an integrated structure of a heating element 11 and a tube body 101. Thus, the ceramic tube can be used to accommodate tobacco products, directly heat the tobacco products, and provide heat insulation.

[0106] See also Fig.15 , is a further flow chart of a method for manufacturing a ceramic tube in some embodiments of the present application. Fig.15 As shown, the manufacturing method of the ceramic tube comprises the following steps:

[0107] S1: forming a ceramic tube blank on the outer periphery of a rod-shaped forming member and forming an integral structure with the rod-shaped forming member, wherein the rod-shaped forming member is made of a material that can be burned out at a burning-out temperature under a first gas condition.

[0108] S4: Dewaxing and degreasing the integrated structure formed by the ceramic tube blank and the rod-shaped forming member.

[0109] S2: Sintering the integrated structure formed by the ceramic tube blank and the rod-shaped forming piece at a first temperature under a second gas condition to sinter the ceramic tube blank into porcelain, thereby obtaining a ceramic tube assembly integrally combined with the rod-shaped forming piece.

[0110] S3: Under the first gas condition, sintering the ceramic tube assembly at a second temperature to burn out the rod-shaped forming member to obtain the ceramic tube, wherein the second temperature is lower than the first temperature and greater than or equal to the burn-out temperature.

[0111] That is, in a further embodiment, after forming an integrated structure of the ceramic tube blank and the rod-shaped forming piece, the integrated structure formed by the ceramic tube blank and the rod-shaped forming piece is first placed in a dewaxing and degreasing furnace for dewaxing and degreasing, and then sintered into porcelain.

[0112] Among them, as mentioned above, whether it is ceramic slurry or cast substrate, it is actually made of ceramic powder and at least one binder including paraffin, beeswax, stearic acid, etc., therefore, it will lead to impure ceramic components. After dewaxing and degreasing, these binders can be burned away, so that after sintering into porcelain, the purity of the ceramic tube after porcelainization can be effectively improved.

[0113] See also Fig.16 , is an embodiment of the present application Fig.15 The sub-flow chart of step S4 in FIG. Fig.16 As shown, the step S4 includes: S41: performing multiple wax removal and degreasing stages in sequence to remove wax and degrease the integrated structure formed by the ceramic tube blank and the rod-shaped forming piece, wherein the multiple wax removal and degreasing stages include multiple stages of alternating heating and heat preservation, and the temperature of the multiple wax removal and degreasing stages gradually increases.

[0114] Please also read Fig.17 and Fig.18 , Fig.17 In some embodiments of this application Fig.16 The sub-flow chart of step S41 in Fig.18 This is a data diagram of the wax removal and degreasing process in one embodiment of the present application. Fig.17 As shown, the step S41 may include:

[0115] S411: In the first wax removal and degreasing stage, the wax removal and degreasing temperature is controlled to rise from a first wax removal temperature to a second wax removal temperature at a first heating rate within a first preset time period.

[0116] S412: In the second wax removal and degreasing stage, the wax removal and degreasing temperature is controlled to be maintained at the second wax removal temperature within a second preset time period.

[0117] S413: In the third wax removal and degreasing stage, the wax removal and degreasing temperature is controlled to rise from the second wax removal temperature to the third wax removal temperature at a second heating rate within a third preset time period.

[0118] S414: In the fourth wax removal and degreasing stage, the wax removal and degreasing temperature is controlled to be maintained at the third wax removal temperature within a fourth preset time period.

[0119] S415: In the fifth wax removal and degreasing stage, the wax removal and degreasing temperature is controlled to rise from the third wax removal temperature to the fourth wax removal temperature at a third heating rate within a fifth preset time period.

[0120] S416: In the sixth wax removal and degreasing stage, the wax removal and degreasing temperature is controlled to be maintained at the fourth wax removal temperature within a sixth preset time period.

[0121] Among them, Fig.18 As shown, the first wax row temperature is 25°C, the second wax row temperature is 150°C, the first heating rate is 0.9°C / min, the first preset time is 2h; the second preset time is 1.5h; the second heating rate is 0.4°C / min, the third wax row temperature is 250°C, the third preset time is 4h; the fourth preset time is 1.5h; the third heating rate is 0.5°C / min, the fourth wax row temperature is 380°C, the fifth preset time is 5h; the sixth preset time is 2h. Specifically, the first wax row temperature is room temperature, such as the aforementioned 25°C, or other room temperature values.

[0122] Therefore, after the above-mentioned multiple wax removal and degreasing stages, the temperature is raised and kept warm alternately, so that the components other than the ceramic material can be effectively sintered to obtain a ceramic tube with higher purity.

[0123] The dewaxing and degreasing of the integrated structure of the ceramic tube blank and the rod-shaped forming part is carried out in a dewaxing and degreasing furnace, that is, the aforementioned step S4 may include: placing the integrated structure of the ceramic tube blank and the rod-shaped forming part into a dewaxing and degreasing furnace, and then controlling the dewaxing and degreasing furnace to sequentially perform multiple dewaxing and degreasing stages to perform dewaxing and degreasing. The dewaxing and degreasing temperature may specifically be the internal temperature of the dewaxing and degreasing furnace, and the control of the dewaxing and degreasing temperature may be achieved by controlling the internal temperature of the dewaxing and degreasing furnace.

[0124] Among them, the above-mentioned wax removal and degreasing process can be carried out under the first gas condition, that is, in an aerobic environment. Since the highest temperature reached during the wax removal and degreasing process is 380°C, which is lower than the aforementioned burn-out temperature, the rod-shaped shaped parts will not be burned out during the wax removal and degreasing process.

[0125] Wherein, in any of the aforementioned embodiments, when the ceramic tube includes a heating element, after step S4, the method may further include: glazing the inner surface of the ceramic tube to seal the heating element in the ceramic tube.

[0126] Among them, since part of the heating element may be exposed on the inner wall of the ceramic tube after the ceramic tube is formed, the heating element can be completely sealed in the ceramic tube by glazing the inner surface of the ceramic tube, and the smoothness of the inner wall of the ceramic tube can be ensured, which is convenient for the insertion and removal of tobacco products and the subsequent cleaning of the inner wall of the ceramic tube.

[0127] In any of the above embodiments, the rod-shaped shaping member is made of graphite or carbon-carbon composite material. The carbon-carbon composite material is a composite material made of carbon (graphite) fiber or fabric as a reinforcing material and deposited carbon or impregnated carbon as a matrix.

[0128] See also Fig.19 , which is a schematic diagram of the structure of the ceramic tube in some other embodiments. Fig.19 As shown, the ceramic tube 10 may only include the tube body 101, but not the heating element 11. In this case, the ceramic tube 10 receives the tobacco product through the tube body 101, and after the tobacco product is heated by the additional heating element, the tobacco product is insulated.

[0129] in, Fig.12 , Fig.19 The ceramic tube 10 shown is manufactured according to the corresponding steps or corresponding embodiments in the aforementioned ceramic tube manufacturing method.

[0130] Therefore, the present application also provides a ceramic tube 10 made by the aforementioned ceramic tube manufacturing method. The ceramic tube 10 can be the aforementioned Fig.12 The ceramic tube 101 is an integrated structure including a heating element 11 and a tube body 101. Thus, the ceramic tube can be used to accommodate tobacco products, directly heat the tobacco products, and provide heat insulation. The ceramic tube 101 can also be Fig.19 The structure shown does not include the heating element 11. In this case, the ceramic tube 10 can accommodate tobacco products through the tube body 101, and after the tobacco products are heated by the additional heating element, the tobacco products are kept warm and insulated.

[0131] Through the aforementioned manufacturing method, a ceramic tube with a high-precision inner diameter can be manufactured at a relatively low manufacturing cost. Therefore, the accuracy of the inner diameter of the ceramic tube obtained according to the manufacturing method can be effectively improved.

[0132] The ceramic tube manufactured by the above-mentioned ceramic tube manufacturing method can be applied to an aerosol generating device.

[0133] See also Fig. 20 , is a schematic diagram of a simple structure of an aerosol generating device 100 in an embodiment of the present application. Fig. 20 As shown, the aerosol generating device 100 comprises the ceramic tube 10 in any of the aforementioned embodiments, and the ceramic tube 10 is used to contain the tobacco product Y1.

[0134] Wherein, when the ceramic tube 10 is an integrated structure including a heating element 11 and a tube body 101 having a plurality of vacuum or low-pressure microcavities, the heating element 11 is used to generate heat after being powered on to heat the tobacco product Y1, and the tube body 101 is used for heat preservation and heat insulation. In some embodiments, when the ceramic tube 10 does not include a heating element, an additional heating element may be arranged inside the ceramic tube 10, and the additional heating element is used to generate heat to heat the tobacco product Y1, and at this time, the ceramic tube 10 is used for heat preservation and heat insulation. Wherein, the additionally arranged heating element may be a tubular element, the ceramic tube 10 may be sleeved on the heating element, and the tobacco product Y1 is specifically accommodated inside the heating element. Wherein, the heating element may be a one-stage or multi-stage structure, for example, the heating element includes a multi-stage tube body, and adjacent tube bodies are connected by a thermal insulation element to form an integrated tubular element, and the length of the heating element may be substantially the same as the length of the ceramic tube 10. In other embodiments, the additionally provided heating element may also be other structures, for example, it may include a plurality of straight metal strips, which are attached to the inner wall of the ceramic tube 10 and arranged in a ring along the central axis of the ceramic tube 10. The heating element may be made of a metal or alloy material with good thermal conductivity, such as iron, copper, etc.

[0135] Among them, Fig. 20 As shown, the aerosol generating device 100 further includes an aerosol output end 20 , which is a port through which the aerosol generating device 100 outputs aerosol for inhalation by a user. For example, the aerosol output end 20 may be a filter end.

[0136] like Fig. 20As shown, the aerosol generating device 100 further includes an atomizing assembly 30, which is disposed adjacent to the ceramic tube 10 and arranged with the ceramic tube 10 in a direction gradually away from the aerosol output end 20. The extension direction of the ceramic tube 10 is the same as the arrangement direction of the atomizing assembly 30 and the ceramic tube 10, and the ceramic tube 10 is farther away from the aerosol output end 20 than the atomizing assembly 30. The extension direction of the ceramic tube 10 is the direction of the central axis of the ceramic tube 10.

[0137] The atomizing assembly 30 is provided with essential oil, wherein when the aerosol generating device 100 starts the heating function and the tobacco product is inhaled, when the ceramic tube 10 or the heating element arranged in the ceramic tube 10 heats the tobacco product Y1 contained in the ceramic tube 10 to generate aerosol, the essential oil is also heated and atomized to form atomized gas, and the aerosol passes through the ceramic tube 10 to reach the atomizing assembly 30, and is mixed with the atomized essential oil to obtain an aerosol mixed with the atomized gas, and then the aerosol mixed with the atomized gas reaches the aerosol output end 20, so as to be inhaled by the user. The essential oil in the atomizing assembly 30 can be heated and atomized alone, or it can be atomized by the aerosol reaching the atomizing assembly 30.

[0138] Among them, Fig. 20 As shown, the aerosol generating device 100 may further include a cooling channel 40, which is located between the aerosol output end 20 and the atomizing assembly 30. The aerosol mixed with the atomizing gas just coming out of the atomizing assembly 30 has a higher temperature. Therefore, after the aerosol and the atomizing gas are mixed, they are cooled through the cooling channel 40 and then reach the aerosol output end 20 for inhalation by the user.

[0139] in, Fig. 20 The aerosol generating device 100 is only a simple example, and the ceramic tube is not limited to application in Fig. 20 The aerosol generating device 100 shown can also be applied to aerosol generating devices with other structures.

[0140] Through the aforementioned manufacturing method, a ceramic tube with a high-precision inner diameter can be manufactured at a lower manufacturing cost, so the precision of the inner diameter of the ceramic tube obtained by the manufacturing method can be effectively improved. The improved precision of the inner diameter of the ceramic tube can make the inner wall of the ceramic tube in close contact with the tobacco product or the heating element, etc., improve the heating or heat preservation performance, and effectively improve the overall performance of the aerosol generating device.

[0141] In the present application, through the aforementioned ceramic tube manufacturing method, ceramic tube 10 and aerosol generating device 100, by providing the rod-shaped shaping piece, the ceramic tube blank is formed on the outer periphery of the rod-shaped shaping piece for sintering, and after the ceramic tube blank is sintered into porcelain, the rod-shaped shaping piece is burned away, and the inner diameter of the ceramic tube can be effectively shaped by the rod-shaped shaping piece during the sintering of the ceramic tube blank into porcelain, which effectively avoids the problem of low precision of the inner diameter after porcelain formation due to internal shrinkage of the ceramic tube during the sintering process in the prior art. In addition, since only the rod-shaped shaping piece with high outer diameter precision needs to be provided, the manufacturing cost is low. Therefore, according to the ceramic tube manufacturing method of the present application, a ceramic tube with a high-precision inner diameter can be manufactured at a low manufacturing cost, and the precision of the inner diameter of the ceramic tube can be effectively improved, thereby improving the performance of the aerosol generating device.

[0142] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0143] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0144] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for manufacturing a ceramic tube, characterized in that: The method comprises the following steps: S1: forming a ceramic tube blank on the outer periphery of a rod-shaped forming member and forming an integral structure with the rod-shaped forming member, wherein the rod-shaped forming member is made of a material that can be burned out at a burnout temperature under a first gas condition, wherein the first gas condition is an oxygen environment, and the burnout temperature is above 400° C.; S2: sintering the integrated structure formed by the ceramic tube blank and the rod-shaped forming member at a first temperature under a second gas condition to sinter the ceramic tube blank into porcelain, thereby obtaining a ceramic tube assembly integrated with the rod-shaped forming member, wherein the first temperature is within a range of 600° C. to 900° C., and wherein the second gas condition is one of a vacuum environment, a neutral atmosphere environment, and a reducing atmosphere environment; and S3: Under the first gas condition, sintering the ceramic tube assembly at a second temperature to burn out the rod-shaped forming member to obtain the ceramic tube, wherein the second temperature is lower than the first temperature and greater than or equal to the burn-out temperature, wherein the second temperature is within a range of 400°C-700°C.

2. The method for manufacturing a ceramic tube according to claim 1, characterized in that: The step S2 comprises: S21: sintering the integrated structure formed by the ceramic tube blank and the rod-shaped forming piece at the first temperature under the second gas condition, and keeping the temperature for 15-300 minutes, so as to sinter the ceramic tube blank into porcelain, and obtain a ceramic tube assembly integrated with the rod-shaped forming piece.

3. The method for manufacturing a ceramic tube according to claim 1, characterized in that: The step S3 comprises: S31: Under the first gas condition, sintering the ceramic tube assembly at a second temperature and keeping the temperature for 15-300 minutes to burn out the rod-shaped forming piece to obtain the ceramic tube.

4. The method for manufacturing a ceramic tube according to claim 1, characterized in that: The step S1 comprises: S111: placing a rod-shaped shaping piece in a forming mold, wherein the rod-shaped shaping piece and an inner wall of a shell of the forming mold form an annular columnar space; and, S112: Injecting ceramic slurry into the annular columnar space to form a ceramic tube blank, and forming an integral structure with the rod-shaped forming piece.

5. The method for manufacturing a ceramic tube according to claim 4, characterized in that: Before step S112, step S1 further includes: S113: arranging a heating element on the outer periphery of the rod-shaped shaping element; The step of injecting ceramic slurry into the annular columnar space to form a ceramic tube blank comprises: injecting ceramic slurry into the annular columnar space and combining the ceramic slurry with the heating element to form the ceramic tube blank.

6. The method for manufacturing a ceramic tube according to claim 1, characterized in that: The step S1 comprises: S121: rolling a first unprinted cast substrate onto a rod-shaped forming member; S122: printing a heating circuit on the second casting substrate, and rolling the second casting substrate printed with the heating circuit on the first casting substrate without printing; and S123: fusing the first cast substrate and the second cast substrate to obtain the ceramic tube blank formed on the outer periphery of the rod-shaped forming member and forming an integral structure with the rod-shaped forming member.

7. The method for manufacturing a ceramic tube according to claim 1, characterized in that: Before step S2, the method further includes: S4: Dewaxing and degreasing the integrated structure formed by the ceramic tube blank and the rod-shaped forming member.

8. The method for manufacturing a ceramic tube according to claim 7, characterized in that: The step S4 comprises: S41: performing a plurality of wax removal and degreasing stages in sequence to remove wax and degrease the integrated structure formed by the ceramic tube blank and the rod-shaped forming member, wherein the plurality of wax removal and degreasing stages include a plurality of stages of alternating heating and heat preservation.

9. The method for manufacturing a ceramic tube according to any one of claims 1 to 8, characterized in that: The rod-shaped shaping piece is made of graphite or a carbon-carbon composite material.

10. A ceramic tube, characterized in that: The ceramic tube is made according to the manufacturing method according to any one of claims 1-9.

11. An aerosol generating device, characterized in that: The aerosol generating device comprises the ceramic tube according to claim 10.

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