CN115894049A

CN115894049A - Method for manufacturing ceramic tube, and aerosol-generating device

Info

Publication number: CN115894049A
Application number: CN202211413373.2A
Authority: CN
Inventors: 魏冰
Original assignee: Beijing Wenzhi Technology Co Ltd
Current assignee: Beijing Wenzhi Technology Co Ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-04-04

Abstract

The embodiment of the application discloses a manufacturing method of a ceramic tube, which comprises the following steps: providing ceramic powder particles, wherein the ceramic powder particles are hollow particles with vacuum or low pressure inside; forming ceramic powder particles into a flowable fluid mass; forming the fluid material into a hollow tubular blank; and sintering the tubular blank to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body. The application also provides a ceramic tube and an aerosol-generating device with the ceramic tube. The ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body can be manufactured, and the ceramic tube can have a small heat conduction coefficient and a small heat shrinkage coefficient. When the ceramic tube is applied to the aerosol generating device, heat dissipation can be effectively avoided, heat of the tobacco product can be effectively insulated, accordingly, the heating rate of the tobacco product can be effectively improved, power consumption is saved, and user experience is improved.

Description

Method for manufacturing ceramic tube, and aerosol-generating device

Technical Field

The invention relates to the field of aerosol generation, in particular to a ceramic tube applied to an aerosol generation device, a manufacturing method thereof and the aerosol generation device with the ceramic tube.

Background

With the development of technology and the demand for quality of life, aerosol generating devices have come to be developed which generate aerosol by heating a smoking article such as a conventional cigarette, and which generate aerosol including components such as nicotine by atomizing components such as nicotine in a smoking article such as a conventional cigarette by heating the smoking article. The existing aerosol generating device can realize the mouth feel close to that of a common cigarette during combustion to a certain extent, and the mode does not need to combust a cigarette product, so that the harm of smoking and the pollution to the environment can be effectively reduced. In a conventional aerosol generating device, a receiving tube is provided to receive a smoking article such as a conventional cigarette, and a heating member is provided in the receiving tube to heat the smoking article.

However, the containing tube in the related art is generally high in heat conductivity coefficient, and in the process of heating the smoking article by the heating element, the containing tube absorbs heat, so that the heat generated by the heating element is dissipated relatively quickly, and accordingly, the heat required for heating the smoking article can be maintained by increasing the power.

Disclosure of Invention

The embodiment of the invention provides a ceramic tube manufacturing method, a ceramic tube and an aerosol generating device, which can obtain the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in a tube body, and the ceramic tube with the plurality of vacuum or low-pressure micro-cavities in the tube body has a smaller heat conduction coefficient and a smaller heat shrinkage coefficient, can effectively preserve heat, improve the heating rate and improve the user experience.

In one aspect, an embodiment of the present invention provides a method for manufacturing a ceramic tube, where the method for manufacturing a ceramic tube includes the following steps: a1: providing ceramic powder particles, wherein the ceramic powder particles are hollow particles with a vacuum or low pressure inside; a2: forming the ceramic powder particles into a flowable fluid mass; a3: forming the fluid material into a hollow tubular blank; a4: and sintering the tubular blank to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

On the other hand, the embodiment of the invention also provides a manufacturing method of the ceramic tube, which comprises the following steps: b1: mixing ceramic powder and a pore-forming agent; b2: preparing the ceramic powder and the pore-forming agent into a flowable fluid material; b3: forming the fluid material into a hollow tubular blank; b4: sintering the tubular blank, and forming pores through the pore-forming agent to prepare a tubular porous blank; b5: and sintering the tubular porous blank under preset conditions to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

In another aspect, an embodiment of the present invention further provides a ceramic tube, where a tube body of the ceramic tube has a plurality of vacuum or low-pressure micro-cavities therein, where the ceramic tube is manufactured by a manufacturing method of the ceramic tube. The manufacturing method of the ceramic tube comprises the following steps: a1: providing ceramic powder particles, wherein the ceramic powder particles are hollow particles with an internal vacuum or low pressure; a2: forming the ceramic powder particles into a flowable fluid mass; a3: forming the fluid material into a hollow tubular blank; a4: and sintering the tubular blank to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body. Or, the manufacturing method of the ceramic tube comprises the following steps: b1: mixing ceramic powder and a pore-forming agent; b2: preparing the ceramic powder and the pore-forming agent into a flowable fluid material; b3: forming the fluid material into a hollow tubular blank; b4: sintering the tubular blank, and forming pores through the pore-forming agent to prepare a tubular porous blank; b5: and sintering the tubular porous blank under preset conditions to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

In yet another aspect, embodiments of the present invention further provide an aerosol-generating device, which includes the ceramic tube, and a tube body of the ceramic tube has a plurality of vacuum or low-pressure micro-cavities therein. Wherein the ceramic tube is manufactured by a manufacturing method of the ceramic tube. The manufacturing method of the ceramic tube comprises the following steps: a1: providing ceramic powder particles, wherein the ceramic powder particles are hollow particles with an internal vacuum or low pressure; a2: forming the ceramic powder particles into a flowable fluid mass; a3: forming the fluid material into a hollow tubular blank; a4: and sintering the tubular blank to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body. Or the manufacturing method of the ceramic tube comprises the following steps: b1: mixing ceramic powder and a pore-forming agent; b2: preparing the ceramic powder and the pore-forming agent into a flowable fluid material; b3: forming the fluid material into a hollow tubular blank; b4: sintering the tubular blank, and forming pores through the pore-forming agent to prepare a tubular porous blank; b5: and sintering the tubular porous blank under a preset condition to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

According to the ceramic tube manufacturing method, the ceramic tube and the aerosol generating device provided by the embodiment of the invention, the ceramic tube with the plurality of vacuum or low-pressure micro-cavities in the tube body is obtained through manufacturing, so that the ceramic tube with the plurality of vacuum or low-pressure micro-cavities in the tube body is used as a containing tube for containing a smoking article in the aerosol generating device, or the ceramic tube further comprises the heating part as a heating tube integrally combined with the heating part, the ceramic tube with the plurality of vacuum or low-pressure micro-cavities in the tube body can have a smaller heat conduction coefficient and a smaller heat shrinkage coefficient, the absorption of heat of the heating part can be effectively avoided, the heat dissipation can be effectively avoided, the heat of the smoking article can be favorably preserved, the heating rate of the smoking article can be effectively improved, the power consumption can be saved, and the user experience can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other modifications can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a flow chart of a method of manufacturing a ceramic tube in some embodiments of the present application.

Fig. 2 is a schematic structural diagram of ceramic powder particles in an embodiment of the present application after removing a portion of the shell structure.

Fig. 3 is a sub-flow diagram of step a2 in fig. 1 in an example in some embodiments of the present application.

Fig. 4 is a schematic view of a further sub-flow of the step a21 in fig. 3 in some embodiments of the present application.

Fig. 5 is a sub-flowchart of step a3 of fig. 1 in an example in some embodiments of the present application.

Fig. 6 is a sub-flow diagram of step a2 in fig. 1 in another example in some embodiments of the present application.

Fig. 7 is a sub-flow diagram of step a3 in fig. 1 in another example in some embodiments of the present application.

Fig. 8 is a schematic flow chart of a further method of making a ceramic tube according to some embodiments of the present application.

Fig. 9 is a perspective view illustrating a ceramic tube manufactured by the manufacturing method shown in fig. 8.

Fig. 10 is a sub-flowchart of step a4 of fig. 1 in some embodiments of the present application.

FIG. 11 is a graph of sintering data in an example of the present application.

FIG. 12 is a flow chart of a de-waxing process, in some embodiments of the present application.

Fig. 13 is a sub-flowchart of step S12 in fig. 12 in some embodiments of the present application.

Fig. 14 is a data diagram of a dewaxing and degreasing process in an embodiment of the present application.

Fig. 15 is a flow chart of a method of manufacturing a ceramic tube according to further embodiments of the present application.

Fig. 16 is a sub-flow diagram of step b2 of fig. 15 in an example in some embodiments of the present application.

Fig. 17 is a schematic view of a further sub-flow of the step b21 of fig. 16 in some embodiments of the present application.

FIG. 18 is a sub-flowchart of step b3 of FIG. 15 in an example in some embodiments of the present application.

Fig. 19 is a sub-flow diagram of step b2 of fig. 15 in another example in some embodiments of the present application.

Fig. 20 is a sub-flowchart of step b3 in fig. 15 in another example in some embodiments of the application.

Fig. 21 is a schematic flow chart of a further method of making a ceramic tube according to further embodiments of the present application.

FIG. 22 is a sub-flowchart of step b5 of FIG. 15 in some embodiments of the present application.

Fig. 23 is a graph of sintering data during sintering of the tubular porous blank under preset conditions.

FIG. 24 is a sub-flowchart of step b4 of FIG. 15 in some embodiments of the present application.

Fig. 25 is a data diagram of a dewaxing and degreasing process in an embodiment of the present application.

Fig. 26 is a perspective view of a ceramic tube according to an embodiment of the present application.

Fig. 27 is a schematic cross-sectional view of a ceramic tube according to an embodiment of the present application.

Fig. 28 is a schematic diagram of a simple structure of an aerosol-generating device according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

Step numbers corresponding to various steps in the present application, such as a1, a2, and the like, are only for convenience of description, the step names are not used to limit the execution sequence of the steps, and other steps may also be included between adjacent steps, and other steps may also be included before or after any step.

Fig. 1 is a flow chart of a method for manufacturing a ceramic tube according to some embodiments of the present disclosure. The manufacturing method of the ceramic tube is not limited to the sequence shown in fig. 1, and other steps may be included between adjacent steps. As shown in fig. 1, the manufacturing method of the ceramic tube includes the steps of:

a1: providing ceramic powder particles, wherein the ceramic powder particles are hollow particles with an internal vacuum or low pressure.

a2: forming the ceramic powder particles into a flowable fluid mass.

a3: and forming the fluid material into a hollow tubular blank.

a4: and sintering the tubular blank to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

Thus, in some embodiments of the present application, a ceramic tube having a plurality of vacuum or low-pressure microcavities in the tube body can be obtained by providing hollow ceramic powder particles having an internal vacuum or low pressure as a raw material, followed by molding and sintering. Thereby, the ceramic pipe that has a plurality of vacuums or low pressure microcavity in the body can have less coefficient of thermal conductivity and less thermal contraction coefficient, uses the ceramic pipe that has a plurality of vacuums or low pressure microcavity in the body comes as the containing pipe of acceping smoking article among the aerosol generating device, can effectively avoid the heat to the piece that generates heat absorption, also can effectively avoid the heat to give off, effectively keeps warm to smoking article's heat, thereby, can effectively improve smoking article's rate of rising temperature to can effectively maintain smoking article temperature, can improve the speed of cigarette and save the consumption, improve user experience.

Fig. 2 is a schematic structural diagram of an embodiment of the present application, in which a portion of the shell structure of the ceramic powder particles is removed. Wherein fig. 2 schematically shows the structure of each of the ceramic powder particles L1 provided in said step a 1. As shown in fig. 2, each ceramic powder particle L1 includes a housing L11 made of a ceramic material and a sealed space L12 formed by sealing the housing L11, and the sealed space L12 has no air or low air density, i.e., vacuum or low pressure, so as to form a hollow particle with an internal vacuum or low pressure. Herein, the low pressure refers to the gas pressure in the sealed space L12 being 1/5, 1/6, 1/10, 1/15, etc. of the atmospheric pressure.

In some embodiments, step a1 may comprise: a corresponding amount of ceramic powder particles is provided according to the size of the ceramic tube to be manufactured.

Please refer to fig. 3, which is a sub-flowchart illustrating an example of step a2 in fig. 1 according to some embodiments of the present application. In one example, the fluid material comprises a slurry, and the step a2 comprises:

a21: and bonding the ceramic powder particles by using a bonding material to prepare the flowable slurry.

That is, in some embodiments, the ceramic powder particles are made into a flowable fluid mass of: and bonding the ceramic powder particles by using a bonding material to prepare flowable slurry.

Please refer to fig. 4, which is a schematic sub-flowchart of the step a21 shown in fig. 3 according to some embodiments of the present application. As shown in fig. 4, the step a21 may specifically include:

a211: and carrying out internal mixing on the ceramic powder particles and the binder to form a wax cake.

a212: and dissolving the wax cake into the flowable slurry through injection molding or pressure casting.

That is, in some embodiments, specifically, the ceramic powder particles and the binder are first banburying to form a wax cake, and then the wax cake is injection molded (also referred to as injection molding) or die casting to form the flowable slurry.

The wax cake refers to a solid body formed by bonding the ceramic powder particles and the binder together after banburying, but the shape is not limited to a cake shape, and can be a round ball, a square shape, an irregular shape and the like.

Wherein, in some embodiments, the binder may include at least one of paraffin wax, beeswax, stearic acid, and the like.

In some embodiments, the ratio of the ceramic powder particles to the binder may be 6, the ceramic powder particles ratio is 6, and the binder ratio is 4. The ratio may be a mass ratio.

In some embodiments, the step a211 may further include: and bonding the ceramic powder particles and glass powder to form bonded ceramic powder particles bonded with each other among the ceramic powder particles, mixing the bonded ceramic powder particles and the bonding material, and banburying to form the wax cake.

That is, in some embodiments, the ceramic powder particles and the glass powder may be bonded to form bonded ceramic powder particles bonded to each other, and then the bonded ceramic powder particles and the binder may be mixed and formed into the wax cake by banburying.

Wherein, the ratio of the ceramic powder particles to the glass powder can be 4. The ratio may be a mass ratio. The ratio of the bonded ceramic powder particles to the binder may be 6:4, wherein the ratio of the bonded ceramic powder particles is 6, and the ratio of the bonding material is 4. The ratio may be a mass ratio. Obviously, the above ratio is only an example, and actually not limited to the above ratio, for example, the ratio of the ceramic powder particles to the glass frit may be 5: 3, and so on.

In some embodiments, the forming of the wax cake by banburying may comprise: and carrying out internal mixing by an internal mixer to form the wax cake. That is, the internal mixing may be accomplished by an internal mixer. In some embodiments, the step a212 may specifically include: the wax cake is subjected to injection molding through an injection machine or die-casting molding through a hot die-casting machine, and the wax cake is dissolved into flowable slurry through injection molding or die-casting; that is, the injection molding may be realized by injection molding using an injection machine, and the die-casting solution may be realized by die-casting using a hot die-casting machine.

Please refer to fig. 5, which is a sub-flowchart illustrating an example of step a3 in fig. 1 according to some embodiments of the present application. As shown in fig. 5, in one example, the step a3 includes:

a31: and injecting the slurry into a molding cavity of a mold, and molding the slurry into a hollow tubular blank, wherein the mold comprises a cylindrical blank, and the cylindrical blank is matched with a shell of the mold to form the molding cavity.

That is, in some embodiments, when the fluid material is the slurry, forming the fluid material into a hollow tubular blank may comprise: and injecting the slurry into a forming cavity of a mold, and forming the hollow tubular blank.

Wherein, the mould can include the cylindrical base, just the casing of mould can be cylindrical casing, just in the both ends of casing edge the central axis, one end is sealed, and the other end has the opening, the cylindrical base is located the central point of cylindrical casing puts, and follows the blind end orientation of casing the opening extends, the cylindrical base can with the casing is the central axis altogether, just the radius of cylindrical base is less than the radius of casing to, form the ring form the shaping cavity.

When the fluid material is the slurry, the wax cake is melted by injection molding or die casting to form the flowable slurry at a higher temperature, for example, 200 ℃, and the flowable slurry is injected into a forming cavity of a mold, and is cooled to form a solid state, and after being cooled to a certain temperature, the solid state can be taken out of the mold, so that the hollow tubular blank is obtained.

The inner diameter of the accurate tubular blank body can be obtained by accurately controlling the outer diameter of the cylindrical blank in advance, and the outer diameter of the accurate tubular blank body can be obtained by accurately controlling the inner diameter of the shell of the die.

Therefore, in some embodiments, the ceramic powder particles are bonded by using the bonding material to form the flowable slurry, and the flowable slurry is injected into a mold for molding, so that a tubular blank with a precise size can be obtained, the process is simple, and cost control is facilitated.

Please refer to fig. 6, which is a sub-flowchart of step a2 in fig. 1 in another example according to some embodiments of the present disclosure.

In another example, the fluid material comprises granulated powder, and the step a2 comprises:

a22: mixing at least one of PVA glue, a dispersing agent, a release agent with the ceramic powder particles to make the granulated powder flowable.

That is, in some embodiments, the fluid material may be a flowable powder, specifically a flowable granulation powder, and may be specifically formed by mixing at least one of a PVA glue, a dispersant, and a release agent with the ceramic powder particles.

In some embodiments, the ratio of the ceramic powder particles to at least one of the PVA glue, dispersant, release agent may be 6: the ceramic powder particles account for 6, and at least one of the PVA glue, the dispersing agent and the release agent accounts for 4. The ratio may be a mass ratio.

Wherein at least one of the PVA glue, the dispersing agent and the release agent is used for forming granular dry pressing granule powder after being mixed with the ceramic powder granules, namely the powder making material.

In some embodiments, the step a22 may specifically include: firstly, the ceramic powder particles and the glass powder are bonded to form bonded ceramic powder particles bonded with each other among the ceramic powder particles, and then at least one of PVA glue, a dispersing agent and a release agent is mixed with the bonded ceramic powder particles to prepare the flowable granulation powder.

That is, in some embodiments, the ceramic powder particles may be bonded with glass frit to form bonded ceramic powder particles, and then mixed with at least one of PVA glue, dispersant, and release agent to obtain the flowable granulation powder.

Wherein, the ratio of the ceramic powder particles to the glass powder can be 4. The ratio may be a mass ratio. The ratio of the ceramic powder particles in a cohesive state to at least one of the PVA glue, the dispersing agent, and the release agent may be 6: and 4, wherein the ratio of the bonded ceramic powder particles is 6, and the ratio of at least one of the PVA glue, the dispersing agent and the release agent is 4. The ratio may be a mass ratio. Obviously, the above ratio is only an example, and actually is not limited to the above ratio, for example, the ratio of the ceramic powder particles to the glass frit may be 5: 3, and so on.

Please refer to fig. 7, which is a sub-flowchart illustrating step a3 in fig. 1 according to another example of some embodiments of the present application.

In another example, the step a3 includes:

a32: filling the granulation powder into a molding cavity of a mold, and dry-pressing and molding the granulation powder into the hollow tubular blank, wherein the mold comprises a cylindrical blank, and the cylindrical blank is matched with the mold shell to form the molding cavity.

Wherein, the filling the granulated powder into a molding cavity of a mold and dry-pressing the granulated powder into the hollow tubular blank may include: after filling the granulated powder into a molding cavity of a mold, dry-pressing the granulated powder in the mold by a dry press or an isostatic pressing device to form a solid, and then taking out the solid from the mold, i.e., demolding, to obtain the hollow tubular blank.

Correspondingly, the mould can include the cylindrical base, just the casing of mould can be cylindrical casing, just the one end of casing is sealed, and the other end has the opening, the cylindrical base is located the central point of cylindrical casing puts, and follows the blind end orientation of casing the opening extends, the cylindrical base can with the center pin is altogether gone here to the casing, just the radius of cylindrical base is less than the radius of casing to, form the ring form the shaping cavity. Similarly, the outer diameter of the cylindrical blank can be precisely controlled in advance to obtain the precise inner diameter of the tubular blank, and the outer diameter of the tubular blank can be precisely controlled by precisely controlling the inner diameter of the shell of the die.

Fig. 8 is a schematic flow chart of a method for manufacturing a ceramic tube according to some embodiments of the present disclosure. As shown in fig. 8, the manufacturing method includes:

a2: forming the ceramic powder particles into a flowable fluid mass.

a5: a heat generating member is provided.

a3: and combining the fluid material with the heating element, and then forming to obtain a hollow tubular blank body embedded with the heating element.

That is, in a further flow, compared to fig. 1, before the step a3, the method further comprises the step a5: providing a heating element; and the step a3 may specifically include: and combining the fluid material with the heating element, and then forming to obtain a hollow tubular blank body embedded with the heating element.

Thus, in some embodiments, the ceramic tube having a plurality of vacuum or low-pressure micro-cavities in the finally formed tube body may be a unitary structure including the heat generating member and the ceramic tube body having a plurality of vacuum or low-pressure micro-cavities. Therefore, the ceramic tube can be used for containing the tobacco products, directly heating the tobacco products and preserving and insulating heat.

Obviously, in some embodiments, the heat generating element may not be included in the finally formed ceramic tube, that is, only the step shown in fig. 1 may be performed without the step a5, and the step a3 may only include forming the fluid material into a hollow tubular blank. Therefore, the finally formed ceramic tube can be only used for containing the tobacco products, and heat preservation and insulation are carried out after the additional heating piece heats the tobacco products.

In some embodiments, the step a5 may include: and fixing the heating member in the mold.

The combining the fluid material and the heating element, and forming to obtain a hollow tubular blank body embedded with the heating element, may include: and placing the fluid material in the die, combining the fluid material and the heating element together, and forming the fluid material and the heating element together to obtain a hollow tubular blank body embedded with the heating element.

Specifically, in some embodiments, when the fluid slurry is a slurry, the step a31 may specifically include: and injecting the slurry into a forming cavity of the mold, combining the slurry and the heating part together, and forming to obtain a hollow tubular blank body embedded with the heating part.

Wherein, because thick liquid is the high temperature thick form, and can closely bond with the piece that generates heat, work as thick liquid cooling back, then can with generate heat the piece closely fixed together, form an organic whole structure, the shaping obtains embedded have generate heat a and hollow tubulose body.

In some embodiments, when the fluid material is granulated powder, the step a32 may specifically include: and filling the granulation powder into a molding cavity of a mold, and tightly combining the granulation powder with the heating piece in the dry pressing molding process to obtain a hollow tubular blank body embedded with the heating piece.

In some embodiments, the heating element may be a metal wire wound around the periphery of the cylindrical blank of the mold, so that after the hollow tubular blank with the heating element embedded therein is formed, the heating element is located on the inner surface of the tubular blank, and after the tubular blank is sintered to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body, the heating element will also be located on the inner surface of the tube body of the hollow ceramic tube. Of course, the heating member is not limited to a wire formed by winding, but may be a pressed metal sheet, and the invention is not limited thereto.

Wherein, in some embodiments, as shown in fig. 8, the method further comprises:

a6: glazing the inner surface of the ceramic tube, and sealing the heating element in the ceramic tube.

Because the heating element is a metal wire wound on the periphery of the cylindrical blank of the die, after the ceramic tube is formed, part of the heating element can be exposed out of the inner wall of the ceramic tube, 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 is ensured.

More specific contents of the steps a1, a2, a3 and a4 in fig. 8 can be referred to the related description.

Fig. 9 is a schematic perspective view of a ceramic tube 10 manufactured by the method shown in fig. 8 according to some embodiments of the present disclosure. Fig. 9 is a schematic view showing the structure of the ceramic tube 10 before being glazed or the ceramic tube of the heat generating member in a perspective view. As shown in fig. 9, the heating element 11 having a mesh structure is disposed on the inner wall of the tube 101 of the hollow ceramic tube 10, and the heating element 11 can completely cover the inner wall of the tube 101 of the hollow ceramic tube 10. That is, in some embodiments, the heat generating member 11 has a mesh structure and can be distributed at various positions inside the tube body 101 of the ceramic tube 10. Wherein, the heating element can be a net structure formed by metal wires. The metal wire can be made of iron, copper, silver or other heat conducting metals or alloy materials.

As shown in fig. 9, the heating element 11 further includes two poles 111, and the two poles 111 extend from one end of the ceramic tube 10 and are used for being connected to positive and negative poles of a power module (not shown), so that the heating element 11 can be electrically heated.

In the present application, when the ceramic tube 10 does not include the heat generating element 11, the tube 101 of the ceramic tube 10 is the ceramic tube 10, and when the ceramic tube 10 includes the heat generating element 11, the tube 101 of the ceramic tube 10 may be a structure excluding the heat generating element 11, that is, at this time, the ceramic tube 10 may include the tube 101 and the heat generating element 11.

Referring to fig. 10 and 11 together, fig. 10 is a sub-flowchart of step a4 in fig. 1 in some embodiments of the present application, and fig. 11 is a graph of sintering data in an embodiment of the present application. As shown in fig. 10, the step a4 includes:

a41: and sintering the tubular blank in a first stage, wherein the sintering temperature is increased to a preset temperature at a preset heating rate within a first time period of the first stage.

a42: and carrying out second-stage sintering on the tubular blank, wherein the sintering temperature is maintained at the preset temperature within a second duration of the second stage so as to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

The gas conditions for the sintering in step a4 may be air, an atmosphere, a vacuum environment, and the like, that is, any gas conditions may be used.

In some embodiments, as shown in fig. 11, the first period of time for which the first phase lasts may be 3 hours (h), the preset ramp rate may be 5 ℃/min (5 degrees celsius/minute), the preset temperature may be 900 ℃, and the second period of time for which the second phase lasts may be 2h. Specifically, in the first stage, the temperature may be increased from a normal temperature, for example, 25 ℃, until the temperature is increased to the preset temperature, for example, 900 ℃. Wherein the first duration and the second duration are corresponding accumulated times in fig. 11.

Wherein the sintering of the tubular blank is performed in a sintering furnace, and the step a4 may include: and placing the tubular blank into a sintering furnace, and sintering the tubular blank to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body. The sintering temperature may specifically be an 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. The step a41 may include: and controlling the temperature of the sintering furnace to rise to a preset temperature at a preset temperature rise rate within a first time period, and sintering the tubular blank in a first stage. The a42 may include: and controlling the temperature of the sintering furnace to maintain the preset temperature within a second time period, and sintering the tubular blank at a second stage.

Thus, according to the above-described method for manufacturing a ceramic tube, a ceramic tube having a plurality of vacuum or low-pressure micro-cavities in a tube body can be obtained by providing hollow ceramic powder particles having a vacuum or low pressure inside as a raw material, followed by molding and sintering. Thereby, use the ceramic tube that has a plurality of vacuums or low pressure microcavity in the body comes as the containing pipe of acceping smoking articles in the aerosol generating device, perhaps still includes the piece that generates heat and as the heating tube with the integrative combination of the piece that generates heat, can effectively avoid the thermal absorption to the piece that generates heat, also can effectively avoid the heat to give off, effectively keep warm to the heat of smoking articles, thereby, can effectively improve smoking articles's intensification rate, and can effectively maintain smoking articles temperature, can improve the speed of giving out the cigarette and save the consumption, improve user experience.

In any of the above embodiments, before the step a4, the method further comprises: and degreasing and dewaxing the tubular blank.

Wherein, in some embodiments, when the fluid slurry is a slurry, degreasing and dewaxing the tubular blank is performed to sinter away the binder used for mixing with the ceramic powder particles in the previous step, i.e., at least one of paraffin wax, beeswax, stearic acid, and the like; when the fluid material is granulated powder, degreasing and dewaxing the tubular blank body are to sinter at least one of PVA glue, a dispersing agent and a release agent which are used for mixing with the ceramic powder particles in the previous step.

Thus, before sintering the tubular blank to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body, the tubular blank is degreased and dewaxed, so that only the ceramic material is basically left, and the ceramic tube with higher purity can be obtained.

Fig. 12 is a flow chart of a degreasing and dewaxing process according to some embodiments of the present disclosure. As shown in fig. 12, the degreasing and dewaxing process, namely, the degreasing and dewaxing process is performed on the tubular blank, including:

s12: the control carries out a plurality of wax removal degrease stages in proper order to carry out the wax removal degrease, wherein, a plurality of wax removal degrease stages include a plurality of phases that are in intensification and heat preservation in turn, just the temperature in a plurality of wax removal degrease stages risees gradually.

Referring to fig. 13 and 14 together, fig. 13 is a sub-flowchart of step S12 in fig. 12 in some embodiments of the present application, and fig. 14 is a data diagram of a dewaxing and degreasing process in an embodiment of the present application. As shown in fig. 13, the step S12 may include:

s121: in the first wax removal degreasing stage, the temperature of wax removal degreasing is controlled to be increased from the first temperature to the second temperature at a first temperature increase rate within a first preset time period.

S122: and in the second wax removal and degreasing stage, controlling the temperature of the wax removal and degreasing to be maintained at the second temperature within a second preset time.

S123: and in the third wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to rise from the second temperature to the third temperature at a second temperature rise rate within a third preset time.

S124: and in a fourth wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to be maintained at the third temperature within a fourth preset time period.

S125: and in the fifth wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to rise from the third temperature to the fourth temperature at a third temperature rise rate within a fifth preset time period.

S126: and in the sixth wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to be maintained at the fourth temperature within a sixth preset time.

As shown in fig. 14, the first temperature is 25 ℃, the second temperature is 150 ℃, the first temperature rise rate is 0.9 ℃/min, and the first preset time period is 2 hours; the second preset time is 1.5h; the second temperature rise rate is 0.4 ℃/min, the third temperature is 250 ℃, and the third preset time is 4h; the fourth preset time is 1.5h; the third temperature rise rate is 0.5 ℃/min, the fourth temperature is 400 ℃, and the fifth preset time is 5h; the sixth preset time is 2h. Specifically, the first temperature may be normal temperature, for example, 25 ℃ as described above, or may be other normal temperature values.

Therefore, through the plurality of wax removal and degreasing stages, the temperature is raised and maintained alternately, components except the ceramic material can be effectively sintered, and the ceramic pipe with high purity is obtained.

Wherein, the dewaxing and degreasing of the tubular blank body are performed in a dewaxing and degreasing furnace, that is, the foregoing S12 may include: and putting the tubular blank into a de-waxing and degreasing furnace, and controlling the de-waxing and degreasing furnace to sequentially perform a plurality of de-waxing and degreasing stages so as to perform de-waxing and degreasing. The dewaxing and degreasing temperature can be specifically the internal temperature of the dewaxing and degreasing furnace, and the dewaxing and degreasing temperature can be controlled by controlling the internal temperature of the dewaxing and degreasing furnace.

Fig. 15 is a flow chart of a method for manufacturing a ceramic tube according to another embodiment of the present application. In other embodiments, as shown in fig. 15, the manufacturing method includes the steps of:

b1: ceramic powder and pore-forming agent are mixed.

b2: and preparing the ceramic powder and the pore-forming agent into a flowable fluid material.

b3: and forming the fluid material into a hollow tubular blank.

b4: and sintering the tubular blank, and forming pores through the pore-forming agent to prepare a tubular porous blank.

b5: and sintering the tubular porous blank under a preset condition to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

Thus, in other embodiments, a ceramic tube having a plurality of vacuum or low-pressure microcavities in the tube body can be obtained by mixing a ceramic powder and a pore-forming agent as raw materials, sintering the pore-forming agent to form voids during the molding and sintering process to obtain a tubular porous blank, and further sintering the tubular porous blank under predetermined conditions. Thereby, the ceramic pipe that has a plurality of vacuums or low pressure microcavity in the body can have less coefficient of thermal conductivity and less thermal contraction coefficient, uses the ceramic pipe that has a plurality of vacuums or low pressure microcavities in the body comes as the containing tube of acceping smoking articles among the aerosol generating device, can effectively avoid the absorption to the heat of the piece that generates heat, also can effectively avoid the heat to give off, effectively keeps warm to smoking articles's heat, thereby, can effectively improve smoking articles's rate of rising temperature to can effectively maintain smoking articles temperature, can improve the speed of giving out the cigarette and save the consumption, improve user experience.

Wherein the ceramic powder in step b1 comprises ceramic particles, but the ceramic particles are not hollow particles with vacuum or low pressure inside, but solid particles. Specifically, the particle size of the ceramic particles in the ceramic powder in step b1 may be significantly smaller than the particle size of the ceramic powder particles in step a1, that is, the ceramic powder in step b1 is a high-fineness ceramic powder.

The pore-forming agent can be organic silicon balls, high-temperature-resistant resin, carbon powder, starch and other materials, and can be lost by burning in the step b 4.

In some embodiments, the preset conditions in step b5 include a vacuum environment, so as to ensure that when the tubular porous blank is sintered to close the pores in the tubular porous blank, the internal environment in the microcavity formed after each pore is closed is vacuum or low pressure, thereby obtaining a plurality of microcavities with vacuum or low pressure inside.

In some embodiments, step b1 may comprise: mixing the ceramic powder and the pore-forming agent according to a preset proportion. Wherein, the proportion of the pore-forming agent can be 5-50%. For example, the preset ratio may be 7:3, the ceramic powder accounts for 7, and the pore-forming agent accounts for 3. The preset ratio may be a mass ratio.

Please refer to fig. 16, which is a sub-flowchart illustrating an example of step b2 in fig. 15 according to some embodiments of the present application.

In one example, the fluid material comprises a slurry, and step b2 comprises:

b21: and bonding the ceramic powder and the pore-forming agent by using a bonding material to prepare flowable slurry.

That is, in some embodiments, the fluid material that forms the ceramic powder and the pore former into a flowable mass may be: and bonding the ceramic powder and the pore-forming agent by using a bonding material to prepare flowable slurry.

Please refer to fig. 17, which is a schematic sub-flowchart of the step b21 shown in fig. 16 according to some embodiments of the present application. As shown in fig. 17, the step b21 may specifically include:

b211: and carrying out honey refining on the ceramic powder, the pore-forming agent and the bonding material to form a wax cake.

b212: and dissolving the wax cake into the flowable slurry through injection molding or pressure casting.

That is, in some embodiments, specifically, the ceramic powder and the binder are first banburying to form a wax cake, and then the wax cake is injection molded (also referred to as injection molding) or die casting to form the flowable slurry.

The wax cake refers to a solid body formed by internally mixing the ceramic powder and the binder and bonded together, but the shape is not limited to a cake shape and can be a round ball, a square shape, an irregular shape and the like.

In some embodiments, the ratio of the mixture of ceramic powder and pore former to the binder may also be 6:4, wherein the mixture ratio is 6, and the binder ratio is 4. The ratio may be a mass ratio. Obviously, the ratio of mix to binder is not limited to the above ratios, and in some embodiments it may be sufficient to ensure that there is more mix than binder, which may also be, for example, 7.

In some embodiments, the step b1 may include: and bonding the ceramic powder and the glass powder to form bonded ceramic powder bonded with each other, and then mixing the bonded ceramic powder and the pore-forming agent to obtain a mixture.

In some embodiments, the step b211 may include: and mixing the mixture obtained by mixing the bonding ceramic powder and the pore-forming agent with the bonding material, and banburying to form a wax cake. That is, in some embodiments, the mixture is obtained by mixing the ceramic powder in a binding state with the pore-forming agent.

The ratio of the ceramic powder to the glass powder can be 4. The ratio may be a mass ratio. The ratio of the mixture obtained by mixing the cohesive ceramic powder and the pore-forming agent to the binder can be 6:4, wherein the mixture ratio is 6, and the binder ratio is 4. The ratio may be a mass ratio.

In some embodiments, the forming of the wax cake by internal mixing may include: and carrying out internal mixing by an internal mixer to form the wax cake. That is, the internal mixing may be accomplished by an internal mixer. In some embodiments, the step b212 may specifically include: the wax cake is injection-molded by an injection machine or die-cast by a hot die-casting machine, and the wax cake is dissolved into the flowable slurry by injection molding or die-casting; that is, the injection molding may be realized by injection molding using an injection machine, and the die-casting solution may be realized by die-casting using a hot die-casting machine.

Please refer to fig. 18, which is a sub-flowchart illustrating an example of step b3 in fig. 15 according to some embodiments of the present application. As shown in fig. 18, in an example, the step b3 includes:

b31: and injecting the slurry into a molding cavity of a mold, and molding the slurry into a hollow tubular blank, wherein the mold comprises a cylindrical blank, and the cylindrical blank is matched with the mold shell to form the molding cavity.

Wherein, the mould can include cylindrical base, just the casing of mould can be cylindrical casing, just the one end of casing is sealed, and the other end has the opening, cylindrical base is located cylindrical casing's central point puts, and follows the blind end orientation of casing the opening extends, cylindrical base can with the casing is total to the center pin, just cylindrical base's radius is less than the radius of casing to, form the circular form the shaping cavity.

Therefore, in some embodiments, the ceramic powder is bonded by the binder to form the flowable slurry, and the slurry is injected into a mold for molding, so that a tubular blank with precise size can be obtained, the process is simple, and cost control is facilitated.

Please refer to fig. 19, which is a sub-flowchart illustrating step b2 in fig. 15 according to another example of some embodiments of the present disclosure. In another example, the fluid material comprises granulated powder, and step b2 comprises:

b22: and mixing at least one of PVA (polyvinyl alcohol) glue, a dispersing agent and a release agent with the ceramic powder and the pore-forming agent to prepare flowable granulation powder.

That is, in some embodiments, the fluid material may be a flowable powder material, specifically a flowable granulation powder, and may be prepared by further mixing at least one of a PVA glue, a dispersing agent, and a release agent with the mixture after the ceramic powder material and the pore-forming agent are mixed to obtain the mixture.

In some embodiments, the ratio of the ceramic powder to at least one of the PVA glue, dispersant, release agent may be 6: and 4, wherein the ceramic powder accounts for 6, and at least one of the PVA glue, the dispersing agent and the release agent accounts for 4. The ratio may be a mass ratio.

Wherein at least one of the PVA glue, the dispersing agent and the release agent is used for forming granular dry pressing granular powder after being mixed with the ceramic powder, namely the powder making material.

In some embodiments, as mentioned above, the step b1 may include: and bonding the ceramic powder and the glass powder to form bonded ceramic powder bonded with each other, and then mixing the bonded ceramic powder and the pore-forming agent to obtain a mixture. The step b22 may specifically include: and mixing at least one of PVA glue, a dispersing agent and a release agent with the cohesive ceramic powder to prepare flowable granulation powder.

That is, in some embodiments, the ceramic powder and the glass powder are bonded to form a bonded ceramic powder in which the ceramic powder and the glass powder are bonded to each other, and then the bonded ceramic powder and the pore-forming agent are mixed to form a mixture, and then the mixture is further mixed with at least one of PVA glue, a dispersing agent and a release agent to obtain the flowable granulation powder.

Wherein the ratio of the ceramic powder to the glass powder can be 4:1, the ceramic powder accounts for 4, and the glass powder accounts for 1. The ratio may be a mass ratio. The ratio of the cohesive ceramic powder to at least one of the PVA glue, the dispersing agent and the release agent can be 6: and 4, wherein the ratio of the cohesive ceramic powder is 6, and the ratio of at least one of the PVA glue, the dispersing agent and the release agent is 4. The ratio may be a mass ratio. Obviously, the above ratio is only an example, and is not limited to the above ratio, for example, the ratio of the ceramic powder to the glass powder may be 5:1, the ratio of the cohesive ceramic powder to at least one of the PVA glue, the dispersing agent and the release agent can be 7:3, and so on.

Please refer to fig. 20, which is a sub-flowchart of step b3 in fig. 15 in another example in some embodiments of the present application. In another example, the step b3 includes:

b32: filling the granulation powder into a molding cavity of a mold, and dry-pressing and molding the granulation powder into the hollow tubular blank, wherein the mold comprises a cylindrical blank, and the cylindrical blank is matched with the mold shell to form the molding cavity.

Wherein, the filling the granulated powder into a molding cavity of a mold and dry-pressing the granulated powder into the hollow tubular blank may include: and filling the granulated powder into a molding cavity of a mold, performing dry pressing on the granulated powder in the mold by using a dry press or an isostatic pressing device to form a solid state, and taking out the solid state from the mold, namely demolding to obtain the hollow tubular blank.

Equally, the mould can include the cylindrical base, just the casing of mould can be cylindrical casing, just the one end of casing is sealed, and the other end has the opening, the cylindrical base is located the central point of cylindrical casing puts, and follows the blind end orientation of casing the opening extends, the cylindrical base can with the center pin is altogether gone here to the casing, just the radius of cylindrical base is less than the radius of casing to, form the ring form the shaping cavity. Similarly, the precise inner diameter of the tubular blank can be obtained by precisely controlling the outer diameter of the cylindrical blank in advance, and the precise outer diameter of the tubular blank can be obtained by precisely controlling the inner diameter of the shell of the die.

Fig. 21 is a schematic flow chart of a method for manufacturing a ceramic tube according to another embodiment of the present application. As shown in fig. 21, the manufacturing method includes:

b1: ceramic powder and pore-forming agent are mixed.

b6: a heat generating member is provided.

b3: and in the process of forming the fluid material into a hollow tubular blank, combining the fluid material with the heating element, and forming to obtain the hollow tubular blank embedded with the heating element.

b5: and sintering the tubular porous blank under preset conditions to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

That is, in a further flow, compared to fig. 15, before the step b3, the method further comprises the step b6: providing a heating element; and the step b3 may specifically include: and in the process of forming the fluid material into a hollow tubular blank, combining the fluid material with the heating element, and forming to obtain the hollow tubular blank embedded with the heating element.

Thus, in some embodiments, the ceramic tube having the plurality of vacuum or low-pressure micro-cavities in the finally-formed tube body may be a unitary structure including the heat generating member and the ceramic tube body having the plurality of vacuum or low-pressure micro-cavities. Therefore, the ceramic tube can be used for containing the smoking products, directly heating the smoking products and preserving and insulating heat.

Obviously, in some embodiments, the heat generating component may not be included in the finally formed ceramic tube, that is, only the step shown in fig. 11 may be performed without the step b6, and the step b3 may only include forming the fluid material into a hollow tubular blank. Therefore, the finally formed ceramic tube can be only used for containing the tobacco products, and heat preservation and insulation are carried out after the additional heating piece heats the tobacco products.

In some embodiments, the step b6 may include: and fixing the heating member in the mold.

The combining the fluid material and the heating element, and forming to obtain a hollow tubular blank body embedded with the heating element, may include: and placing the fluid material in the mould, combining the fluid material and the heating part together, and forming the fluid material and the heating part together to obtain a hollow tubular blank body embedded with the heating part.

Specifically, in some embodiments, when the fluid slurry is a slurry, the step b31 may specifically include: and injecting the slurry into a forming cavity of the mold, combining the slurry and the heating part together, and forming to obtain a hollow tubular blank body embedded with the heating part.

In some embodiments, when the fluid material is granulated powder, the step b32 may specifically include: and filling the granulation powder into a molding cavity of a mold, and tightly combining the granulation powder with the heating piece in the dry pressing molding process to obtain a hollow tubular blank body embedded with the heating piece.

In some embodiments, the heating element may be a metal wire wound around the outer periphery of the cylindrical blank of the mold, so that after the hollow tubular blank with the heating element embedded therein is formed, the heating element is located on the inner surface of the tubular blank, and after the tubular blank is sintered to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body, the heating element will be located on the inner surface of the hollow ceramic tube.

Wherein, in some embodiments, as shown in fig. 21, the method further comprises:

b7: glazing the inner surface of the ceramic tube, and sealing the heating element in the ceramic tube.

Because the heating element is a metal wire wound on the periphery of the cylindrical blank of the die, after the inner surface of the ceramic tube is obtained through molding, part of the heating element may be exposed on the inner wall of the ceramic tube, and the heating element can be completely sealed in the ceramic tube by glazing the inner surface of the ceramic tube, so that the smoothness of the inner wall of the ceramic tube is ensured.

More specific contents of the steps b1, b2, b3, b4, b5, etc. in fig. 21 can be referred to the related descriptions of fig. 15-fig. 20.

The ceramic tube 10 shown in fig. 9 can be obtained by the method for manufacturing a ceramic tube described in fig. 21.

Referring to fig. 22 and 23 together, fig. 22 is a sub-flowchart of step b5 in fig. 15 according to some embodiments of the present disclosure. Fig. 23 is a graph of sintering data during sintering of the tubular porous blank under preset conditions. As shown in fig. 22, step b5 includes:

b51: and sintering the tubular porous blank in a first stage under preset conditions, wherein the sintering temperature is increased to a preset temperature at a preset temperature increasing rate within a first time period of the first stage duration.

b52: and (b) performing a second stage of sintering on the tubular porous blank under preset conditions, wherein the sintering temperature is maintained at the preset temperature for a second duration of the second stage to form the ceramic tube having the plurality of vacuum or low-pressure microcavities in the tube body.

In some embodiments, as shown in fig. 23, the first preset duration of the first stage may be 3 hours, the preset ramp rate may be 5 ℃/min (5 degrees celsius/minute), the preset temperature may be 900 ℃, and the second preset duration of the second stage may be 2 hours. Specifically, in the first stage, the temperature may be increased from a normal temperature, for example, 25 ℃, until the temperature is increased to the preset temperature, for example, 900 ℃.

In any of the embodiments shown in fig. 15-22, the step b4 may include: and sintering the tubular blank, forming pores through the pore-forming agent, and simultaneously removing wax and degreasing the tubular blank to prepare a tubular porous blank.

That is, in some embodiments, in the process of sintering the tubular green body to form the tubular porous body, pores are formed by the pore-forming agent, and simultaneously wax removal and degreasing are performed.

Wherein, in some embodiments, when the fluid slurry is a slurry, de-waxing the tubular blank is used to sinter away the binder used to mix with the ceramic powder particles in the previous step, i.e., at least one of paraffin wax, beeswax, stearic acid, etc.; when the fluid material is granulated powder, degreasing and dewaxing the tubular blank body are to sinter at least one of PVA glue, a dispersing agent and a release agent which are used for mixing with the ceramic powder particles in the previous step.

Thus, before sintering the tubular green body to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body, the tubular green body is degreased and de-waxed, so that only the ceramic material is basically left, and the ceramic tube with higher purity can be obtained.

Specifically, the step b4 may include: and controlling to sequentially perform a plurality of wax removal and degreasing stages to perform wax removal and degreasing, and burning out the pore-forming agent to form a plurality of gaps in the tubular blank, wherein the plurality of wax removal and degreasing stages comprise a plurality of stages alternately in temperature rise and heat preservation, and the temperature of the plurality of wax removal and degreasing stages is gradually increased.

Referring to fig. 24 and 25 together, fig. 24 is a sub-flowchart of step b4 in fig. 15 in some embodiments of the present application, and fig. 25 is a data diagram of a dewaxing and degreasing process in an embodiment of the present application. As shown in fig. 24, the step b4 may more specifically include:

b41: in the first wax removal degreasing stage, the temperature of wax removal degreasing is controlled to rise from a first temperature to a second temperature at a first temperature rise rate within a first preset time period.

b42: and in the second wax removal and degreasing stage, controlling the temperature of the wax removal and degreasing to be maintained at the second temperature within a second preset time.

b43: and in the third wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to rise from the second temperature to the third temperature at a second temperature rise rate within a third preset time.

b44: and in the fourth wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to be maintained at the third temperature within a fourth preset time.

b45: and in the fifth wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to rise from the third temperature to the fourth temperature at a third temperature rise rate within a fifth preset time period.

b46: and in the sixth wax removal and degreasing stage, controlling the temperature of wax removal and degreasing to be maintained at the fourth temperature within a sixth preset time.

As shown in fig. 25, the first temperature is 25 ℃, the second temperature is 150 ℃, the first temperature rise rate is 0.9 ℃/min, and the first preset time period is 2 hours; the second preset time is 1.5h; the second temperature rise rate is 0.4 ℃/min, the third temperature is 250 ℃, and the third preset time is 4h; the fourth preset time is 1.5h; the third temperature rise rate is 0.5 ℃/min, the fourth temperature is 400 ℃, and the fifth preset time is 5h; the sixth preset time is 2h. Specifically, the first temperature may be normal temperature, for example, 25 ℃ as described above, or may be other normal temperature values.

Wherein, the dewaxing and degreasing of the tubular blank are carried out in a dewaxing and degreasing furnace, that is, the b4 may comprise: and after the tubular blank body is placed into a de-waxing and degreasing furnace, controlling the de-waxing and degreasing furnace to sequentially perform a plurality of de-waxing and degreasing stages so as to perform de-waxing and degreasing. The dewaxing and degreasing temperature can be specifically the internal temperature of the dewaxing and degreasing furnace, and the control of the dewaxing and degreasing temperature can be realized by controlling the internal temperature of the dewaxing and degreasing furnace.

Therefore, through the plurality of dewaxing and degreasing stages, the temperature is alternately increased and maintained, and the components except the ceramic material can be effectively burnt off, namely, paraffin, beeswax, stearic acid and the like or PVA glue, a dispersing agent, a release agent and the like and the pore-forming agent can be effectively burnt off, so that the tubular blank with a plurality of pores and high purity is obtained. However, the ceramic tube with high purity and multiple vacuum or low-pressure micro-cavities in the tube body can be obtained by further sintering in the step b 5.

Wherein, in any of the foregoing embodiments, glazing the inner surface of the ceramic tube may include: inside through scribbling, spraying, mode such as infiltration let frit evenly distributed in the inner wall of ceramic pipe. Wherein the glaze is made of glass powder which is softened at 400 ℃.

In some embodiments, glazing the inner surface of the ceramic tube may comprise: and when the glaze is uniformly distributed on the inner wall of the ceramic tube in the internal modes of smearing, spraying, soaking and the like, sintering the ceramic tube.

In some embodiments, when the glaze is uniformly distributed on the inner wall of the ceramic tube by painting, spraying, infiltrating, and the like, the ceramic tube is sintered, and the method may also include a temperature rise stage and a heat preservation stage, and specifically may include:

sintering the ceramic tube in a first stage, wherein the sintering temperature is increased to a preset temperature at a preset heating rate within a first preset duration of the first stage; and sintering the ceramic tube at a second stage, wherein the sintering temperature is maintained at the preset temperature within a second preset time duration of the second stage so as to form the glaze uniformly distributed on the inner wall of the ceramic tube. The preset temperature can be 600 ℃, the first preset time can be 4 hours, the preset heating rate can be 2.5 ℃/min, and the second preset time can be 0.5 hour.

Thus, according to the manufacturing method of the ceramic tube shown in fig. 15 to 25, a ceramic powder and a pore-forming agent are mixed as raw materials, then, in the process of molding and sintering, the pore-forming agent is sintered to form a void to obtain a tubular porous blank, and further, the tubular porous blank is sintered under a preset condition, so that the ceramic tube having a plurality of vacuum or low-pressure microcavities in the tube body can be obtained. Thereby, use the ceramic tube that has a plurality of vacuums or low pressure microcavity in the body comes as the containing pipe of acceping smoking articles in the aerosol generating device, perhaps still includes the piece that generates heat and as the heating tube with the integrative combination of the piece that generates heat, can effectively avoid the thermal absorption to the piece that generates heat, also can effectively avoid the heat to give off, effectively keep warm to the heat of smoking articles, thereby, can effectively improve smoking articles's intensification rate, and can effectively maintain smoking articles temperature, can improve the speed of giving out the cigarette and save the consumption, improve user experience.

Referring to fig. 26 and 27 together, fig. 26 is a perspective view of a ceramic tube 10 according to an embodiment of the present application, and fig. 27 is a cross-sectional view of the ceramic tube according to the embodiment of the present application. As shown in fig. 26 and 27, the ceramic tube 10 is a hollow tube, and a tube body 101 of the ceramic tube 10 has a plurality of vacuum or low-pressure micro-cavities 102 therein.

Wherein, the ceramic tube 10 may not include a heat generating member, but is almost entirely a ceramic material. The ceramic tube 10 is only used for accommodating the smoking articles and is matched with the additionally arranged heating element, and after the additionally arranged heating element heats the smoking articles, the smoking articles and the heating element are subjected to heat preservation and heat insulation.

In some embodiments, as shown in the aforementioned fig. 9, the ceramic tube 10 may be a unitary structure including a heat generating member 11 and a tube body 101 having a plurality of vacuum or low-pressure micro-cavities. Thus, the ceramic tube 10 can be used to house a smoking article, and to directly heat the smoking article, and to preserve heat.

The ceramic tube 10 can be manufactured by the method for manufacturing a ceramic tube in any of the foregoing embodiments.

Please refer to fig. 28, which is a schematic diagram of an aerosol-generating device 100 according to an embodiment of the present application. As shown in fig. 28, the aerosol-generating device 100 comprises the ceramic tube 10 described above, said ceramic tube 10 being for housing a smoking article Y1.

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 micro-cavities, the heating element 11 is powered on to generate heat to heat the smoking article Y1, and the tube body 101 is used for heat preservation and insulation. In some embodiments, when the ceramic tube 10 does not include a heat generating member, an additional heat generating member may be disposed inside the ceramic tube 10, and heat is generated by the additional heat generating member, so as to heat the smoking article Y1, where the ceramic tube 10 is used for heat preservation and insulation. The additional heating element may be a tubular element, the ceramic tube 10 may be sleeved on the heating element, and the smoking article Y1 is specifically accommodated in the heating element. The heating element may be a one-section or multi-section structure, for example, the heating element includes a plurality of sections of tube bodies, 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 additional heat generating element may have other structures, for example, a plurality of straight metal strips attached to the inner wall of the ceramic tube 10 and arranged in a ring shape along the central axis of the ceramic tube 10. The heat generating member may be made of metal or alloy material with good heat conductivity, such as iron, copper, etc.

Wherein, as shown in fig. 28, the aerosol-generating device 100 further comprises an aerosol output 20, the aerosol output 20 being a port for the aerosol-generating device 100 to output aerosol for a user to inhale, for example, the aerosol output 20 may be a filter tip.

As shown in fig. 28, the aerosol-generating device 100 further comprises an atomizing assembly 30, and the atomizing assembly 30 is disposed adjacent to the ceramic tube 10 and aligned with the ceramic tube 10 in a direction gradually away from the aerosol output end 20. The ceramic tube 10 extends in the same direction as the atomizing assembly 30 and the ceramic tube 10, and the ceramic tube 10 is further away from the aerosol output end 20 than the atomizing assembly 30. Wherein, the extending direction of the ceramic tube 10 is the central axis direction of the ceramic tube 10.

Wherein, the atomization component 30 is provided with essential oil, wherein, when the aerosol generating device 100 starts a heating function and smokes the smoking article, when the ceramic tube 10 or a heating element arranged in the ceramic tube 10 heats the smoking article Y1 accommodated in the ceramic tube 10 to generate aerosol, the essential oil is also heated and atomized to form atomized gas, the aerosol reaches the atomization component 30 through the ceramic tube 10 and is mixed with the atomized essential oil to obtain aerosol mixed with the atomized gas, and then the aerosol mixed with the atomized gas reaches the aerosol output end 20 again, so as to be sucked by the user. Wherein, the essential oil in the atomizing assembly 30 can be heated alone for atomization, and can also be atomized by the aerosol reaching the atomizing assembly 30.

Therein, as shown in fig. 28, the aerosol-generating device 100 may further comprise a cooling channel 40, the cooling channel 40 being located between the aerosol output end 20 and the atomizing assembly 30. The temperature of the aerosol mixed with the atomizing gas just coming out of the atomizing assembly 30 is high, so that the aerosol and the atomizing gas are mixed, cooled through the cooling channel 40, and then reach the aerosol output end 20 for the user to suck.

The aerosol-generating device 100 shown in fig. 28 is merely a simple example, and the ceramic tube 10 is not limited to be used in the aerosol-generating device 100 shown in fig. 28, and may be used in aerosol-generating devices of other structures.

In this application, through the manufacturing approach of aforementioned ceramic pipe, can obtain the ceramic pipe that has a plurality of vacuums or low pressure microcavity in the body, when using the ceramic pipe that has a plurality of vacuums or low pressure microcavities comes as the containing tube who accepts smoking articles among the aerosol generating device, perhaps still includes the piece that generates heat and when the heating tube that combines with the piece that generates heat an organic whole, can effectively avoid the absorption to the heat of the piece that generates heat, also can effectively avoid the heat to give off, effectively keep warm to smoking articles's heat, thereby, can effectively improve smoking articles's rate of heating, save the consumption, improve user experience.

It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for manufacturing a ceramic tube, comprising the steps of:

a1: providing ceramic powder particles, wherein the ceramic powder particles are hollow particles with an internal vacuum or low pressure;

a2: forming the ceramic powder particles into a flowable fluid mass;

a3: forming the fluid material into a hollow tubular blank;

2. The method of manufacturing a ceramic tube according to claim 1, wherein the fluid material comprises a slurry, and the step a2 comprises:

3. The method for manufacturing a ceramic tube according to claim 2, wherein the step a21 specifically comprises:

a211: carrying out banburying on the ceramic powder particles and the binder to form a wax cake;

4. The method of claim 3, wherein the step a3 comprises:

a31: and injecting the slurry into a forming cavity of a mold, and forming into a hollow tubular blank body, wherein the mold comprises a cylindrical blank, and the cylindrical blank is matched with the mold shell to form the forming cavity.

5. The method of manufacturing a ceramic tube according to claim 1, wherein the fluid material includes granulated powder, and the step a2 includes:

a22: mixing at least one of PVA glue, dispersing agent and release agent with the ceramic powder particles to prepare flowable granulation powder.

6. The method of claim 5, wherein step a3 comprises:

7. The method for manufacturing a ceramic tube according to claim 1, wherein before the step a3, the method further comprises the steps of:

a5: providing a heating element;

the step a3 comprises the following steps:

and combining the fluid material with the heating element, and forming to obtain a hollow tubular blank body embedded with the heating element.

8. The method of claim 7, wherein the heat generating member is located on an inner surface of the ceramic tube; after the step a4, the method further comprises:

9. The method for manufacturing a ceramic tube according to any one of claims 1 to 8, wherein the step a4 comprises:

sintering the tubular blank in a first stage, wherein the sintering temperature is increased to a preset temperature at a preset heating rate within a first preset duration of the first stage; and

and sintering the tubular blank at a second stage, wherein the sintering temperature is maintained at the preset temperature within a second preset time for the second stage to form the ceramic tube with a plurality of vacuum or low-pressure micro-cavities in the tube body.

10. A method for manufacturing a ceramic tube, comprising the steps of:

b1: mixing ceramic powder and a pore-forming agent;

b2: preparing the ceramic powder and the pore-forming agent into a flowable fluid material;

b3: forming the fluid material into a hollow tubular blank;

b4: sintering the tubular blank, and forming pores through the pore-forming agent to prepare a tubular porous blank;

11. The method of manufacturing a ceramic tube according to claim 10, wherein the predetermined condition includes a vacuum environment.

12. The method of manufacturing a ceramic tube according to claim 10, wherein the fluid material comprises a slurry, and step b2 comprises:

13. The method according to claim 12, wherein step b21 specifically comprises:

b211: banburying the ceramic powder, the pore-forming agent and the bonding material to form a wax cake;

14. The method of manufacturing a ceramic tube according to claim 13, wherein the step b3 comprises:

15. The method of manufacturing a ceramic tube according to claim 10, wherein the fluid material includes granulated powder, and the step b2 includes:

b22: and mixing at least one of PVA (polyvinyl alcohol) glue, a dispersing agent and a release agent with the ceramic powder and the pore-forming agent to prepare the flowable granulation powder.

16. The method of manufacturing a ceramic tube according to claim 15, wherein the step b3 comprises:

17. The method of manufacturing a ceramic tube according to claim 10, wherein before the step b3, the method further comprises the steps of:

b6: providing a heating member;

the step b3 comprises:

and in the process of forming the fluid material into a hollow tubular blank, combining the fluid material with the heating element, and forming to obtain the hollow tubular blank embedded with the heating element.

18. The method of manufacturing a ceramic tube according to claim 17, wherein the heat generating member is located on an inner surface of a wall of the heating tube; the method further comprises the following steps:

b7: glazing the inner surface of the pipe wall of the heating pipe, and sealing the heating wire in the pipe wall of the heating pipe.

19. The method of manufacturing a ceramic tube according to any one of claims 10 to 18, wherein the step b5 comprises:

carrying out first-stage sintering on the tubular porous blank under a preset condition, wherein the sintering temperature is increased to a preset temperature at a preset heating rate within a first preset duration of the first stage; and

and sintering the tubular porous blank in a second stage under a preset condition, wherein the sintering temperature is maintained at the preset temperature within a second preset duration of the second stage duration to form the ceramic tube with the plurality of vacuum or low-pressure micro-cavities in the tube body.

20. A ceramic tube having a body with a plurality of vacuum or low pressure microcavities formed therein by the method of making a ceramic tube as claimed in any one of claims 1 to 19.

21. An aerosol-generating device comprising a ceramic tube having a plurality of vacuum or low pressure microcavities in its body, the ceramic tube being as claimed in claim 20.