CN116003155A - Electronic cigarette atomization core, preparation method of electronic cigarette atomization core and electronic cigarette - Google Patents

Abstract

The embodiment of the present application provides an electronic cigarette core, a preparation method of the electronic cigarette core, and an electronic cigarette. The electronic cigarette core includes a porous ceramic body and a heating element arranged on the porous ceramic body. The porous ceramic body The components of the heating element include the first zirconia powder, the components of the heating element include the second zirconia powder and the conductive powder, and the average particle size of the first zirconia powder is larger than that of the second zirconia powder the average particle size.

Description

Electronic cigarette core, preparation method of electronic cigarette core, and electronic cigarette

technical field

The application belongs to the technical field of electronic cigarette components, and in particular, the application relates to an electronic cigarette core, a preparation method of the electronic cigarette core, and an electronic cigarette.

Background technique

In recent years, with the gradual improvement of people's living standards, people's attention to physical health has generally increased, and more and more people have begun to realize the harm of tobacco to their bodies. As a result, the number of users of electronic cigarettes is increasing day by day. Electronic cigarettes are electronic products imitating cigarettes, which have similar appearance, smoke, taste and feeling to cigarettes. E-cigarette products use the method of atomizing e-liquid to provide users with smoke that can be smoked. Compared with real cigarette products, the advantages of electronic cigarettes are that their health hazards to users are greatly reduced; and most electronic cigarettes are simple in structure, easy to use and operate, small in size, beautiful in appearance and easy to carry.

In the structure of electronic cigarettes, the atomizing core is a very critical component, its main function is to absorb oil and conduct e-liquid, and heat and atomize the e-liquid through the heating element on the atomizing surface of the porous body to form a Inhalation of smoke. In the existing structure of the atomizing core, the porous body of the atomizing core is not firmly bonded to the heating element. In the heating state, the heating element may warp or even burn out, resulting in a low service life of the atomizing core. . Moreover, the existing manufacturing process of the atomizing core requires two sinterings, that is, the porous body is sintered separately for the first time, and then the porous body and the heating element are sintered together for the second time. After such two sinterings, , the porosity of the porous body will decrease, which will affect the atomization effect of the atomization core.

In view of this, it is necessary to propose a new technical solution, at least to increase the service life of the atomizing core.

Contents of the invention

An object of the embodiments of the present application is to provide an electronic cigarette core, a method for preparing the electronic cigarette core, and a new technical solution for the electronic cigarette.

According to the first aspect of the embodiments of the present application, there is provided an electronic smog core, the electronic smog core includes a porous ceramic body and a heating element disposed on the porous ceramic body, and the components of the porous ceramic body include the first Zirconia powder, the components of the heating element include second zirconia powder and conductive powder, the average particle size of the first zirconia powder is larger than the average particle size of the second zirconia powder.

Optionally, the average particle diameter of the first zirconia powder is 25-200 μm, and the average particle diameter of the second zirconia powder is 0.05-0.5 μm.

Optionally, the average particle size of the first zirconia powder is 45-80 μm, and the average particle size of the second zirconia powder is 0.05-0.2 μm.

Optionally, the first zirconia powder includes zirconia, hafnium oxide, and yttrium oxide; the second zirconia powder includes zirconia, hafnium oxide, and yttrium oxide.

Optionally, based on the total mass of the porous ceramic body, the mass percent content of zirconia in the first zirconia powder is 83%-95%; based on the total mass of the heating element, the The mass percent content of zirconia in the second zirconia powder is 83%-95%.

Optionally, the porosity of the porous ceramic body is 30%-70%.

Optionally, the porosity of the heating element is 0%-2%.

Optionally, the conductive powder includes at least two of titanium nitride, titanium carbide, nickel powder, nickel oxide, titanium boride, molybdenum disilicide, molybdenum powder and tungsten powder.

Optionally, in the conductive powder, the mass percentage content of titanium nitride is 10%-40%, the mass percentage content of the titanium carbide is 20%-60%, and the mass percentage content of the nickel powder is 0% -10%, the mass percentage content of the nickel oxide is 0%-10%, the mass percentage content of the titanium boride is 0%-5%, and the mass percentage content of the molybdenum disilicide is 0%-5% , the mass percentage content of the molybdenum powder is 0%-5%, and the mass percentage content of the tungsten powder is 0%-5%.

According to the second aspect of the embodiments of the present application, there is provided a method for preparing an electronic cigarette wick according to the first aspect, including:

Mixing the first zirconia powder, pore forming agent and organic additives under heating conditions to prepare porous ceramic banbury;

uniformly mixing the second zirconia powder, conductive powder and organic solvent to prepare conductor slurry;

Extruding and granulating the porous ceramic mixing material to obtain injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

disposing the conductor slurry on the porous ceramic body;

Degreasing and sintering the porous ceramic green body provided with the conductor slurry is to produce the electronic atomization core.

Optionally, based on the total mass of the ceramic mixing material, the mass percentage content of the pore-forming agent is 5%-30%.

Optionally, the pore former includes at least one of graphite, inorganic carbon powder, particulate organic matter and organic microspheres.

Optionally, the organic additive includes at least one of plastic particles, polyvinyl alcohol and paraffin.

Optionally, the organic solvent includes at least one of terpineol, epoxy resin, butyl carbitol, ethylene glycol ether acetate and tributyl citrate.

Optionally, the heating temperature of the heating condition is 60-250°C.

Optionally, the temperature of the degreasing treatment is not higher than 500° C.; the heating rate of the degreasing treatment is 0.1-2° C./min.

Optionally, the sintering is atmosphere sintering, and the gas introduced into the atmosphere sintering is a mixed gas of H ₂ and N ₂ .

Optionally, the sintering is vacuum sintering, and the vacuum degree of the vacuum sintering is not greater than 1Pa.

Optionally, the sintering temperature is 1200-1600°C.

According to a third aspect of the embodiments of the present application, an electronic cigarette is provided, and the electronic cigarette includes the electronic cigarette core as described in the first aspect.

A technical effect of the embodiment of the present application lies in:

In the electronic smog core provided in the embodiment of the present application, the main materials of the porous ceramic body and the heating element are both zirconia, that is, the materials of the porous ceramic body and the heating element are similar, so that the coefficients of thermal expansion and shrinkage of the two are close, In this way, in the heated state, the bonding surface of the porous ceramic body and the heating element is not easy to produce a thermal stress difference, so it is beneficial to make the porous ceramic body and the heating element more tightly bonded; The probability of burning out, thereby increasing the service life of the atomizing core.

Detailed ways

Various exemplary embodiments of the present application will now be described in detail. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

An embodiment of the present application provides an electronic vaping core, the electronic vaping core includes a porous ceramic body and a heating element disposed on the porous ceramic body, the composition of the porous ceramic body includes a first zirconia powder, The components of the heating element include second zirconia powder and conductive powder, and the average particle diameter of the first zirconia powder is larger than the average particle diameter of the second zirconia powder.

In the electronic smog core provided in the embodiment of the present application, the main materials of the porous ceramic body and the heating element are both zirconia, that is, the materials of the porous ceramic body and the heating element are similar, so that the coefficients of thermal expansion and shrinkage of the two are close, In this way, in the heated state, the bonding surface of the porous ceramic body and the heating element is not easy to produce a thermal stress difference, so it is beneficial to make the porous ceramic body and the heating element more tightly bonded; The probability of burning out, thereby increasing the service life of the atomizing core.

Further, the average particle size of the first zirconia powder selected for the porous ceramic body is larger than the average particle size of the second zirconia powder selected for the heating element, that is, coarse zirconia powder is selected for the porous ceramic body, and fine zirconia powder is selected for the heating element. Zirconia powder, this is because the porous ceramic body needs a pore structure, and the penetration of the pores and a certain pore size must be ensured to ensure the oil conduction rate of the atomizing core; while the heating element needs to have a certain degree of compactness, In order to prevent the e-liquid in the e-cigarette core from penetrating into the pores of the heating element.

In one embodiment, the average particle size of the first zirconia powder is 25-200 μm, and the average particle size of the second zirconia powder is 0.05-0.5 μm.

The average particle size of the first zirconia powder will affect the size of the pores in the porous ceramic body, and the size of the pores in the porous ceramic body will affect the characteristics of the atomizing core. Specifically, the larger the average particle size of the first zirconia powder, the larger the pore size in the porous ceramic body, so that the oil conduction speed of the atomizing core is faster, the atomization amount of the e-liquid is larger, and It is not easy to produce burnt smell, but when the pore size is too large, the atomizing core is prone to oil leakage; the smaller the average particle size of the first zirconia powder, the smaller the pore size in the porous ceramic body, so the lock of the atomizing core The oil capacity is strong and oil leakage is not easy to occur, but if the pore size is too small, the oil conduction speed of the atomizing core is insufficient. Therefore, in this specific example, the average particle size of the first zirconia powder is selected as 25-200 μm, so as to ensure that the atomizing core has sufficient oil conduction speed, can generate sufficient amount of smoke, and is not prone to leakage. Oil.

In addition, the average particle size of the second zirconia powder is selected as 0.05-0.5 μm, so as to achieve the required compactness of the heating element.

In one embodiment, further, the average particle size of the first zirconia powder is 45-80 μm, and the average particle size of the second zirconia powder is 0.05-0.2 μm.

In one embodiment, the first zirconia powder includes zirconia, hafnium oxide, and yttrium oxide; the second zirconia powder includes zirconia, hafnium oxide, and yttrium oxide. Further, based on the total mass of the porous ceramic body, the mass percent content of zirconia in the first zirconia powder is 83%-95%; based on the total mass of the heating element, the The mass percent content of zirconia in the second zirconia powder is 83%-95%.

The hafnium oxide and yttrium oxide contained in the first zirconia powder help to improve the strength of the porous ceramic body; the hafnium oxide and yttrium oxide contained in the second zirconia powder help to improve the compactness of the heating element.

In one embodiment, the porosity of the porous ceramic body is 30%-70%.

The porosity reflects the compactness of the porous ceramic body; the larger the porosity, the looser the porous ceramic body, and the smaller the porosity, the denser the porous ceramic body. Therefore, the larger the porosity, the faster the oil conduction speed of the porous ceramic body, the less likely the porous ceramic body is to leak oil; in this specific example, the porosity of the porous ceramic body is determined as 30%-70% %, to prevent oil leakage while ensuring the oil conduction speed of the porous ceramic body.

In one embodiment, the porosity of the heating element is 0%-2%. Within this range of porosity, the compactness of the heating element is better.

In one embodiment, the conductive powder includes at least two of titanium nitride, titanium carbide, nickel powder, nickel oxide, titanium boride, molybdenum disilicide, molybdenum powder and tungsten powder.

More specifically, the conductive powder includes at least two powders of titanium nitride and titanium carbide, and may also include nickel powder, nickel oxide, titanium boride, molybdenum disilicide, molybdenum powder and tungsten powder.

In one embodiment, further, in the conductive powder, the mass percentage content of titanium nitride is 10%-40%, the mass percentage content of titanium carbide is 20%-60%, and the mass percentage content of the nickel powder is The percentage content is 0%-10%, the mass percentage content of the nickel oxide is 0%-10%, the mass percentage content of the titanium boride is 0%-5%, and the mass percentage content of the molybdenum disilicide is 0%-5%, the mass percentage content of the molybdenum powder is 0%-5%, and the mass percentage content of the tungsten powder is 0%-5%.

The embodiment of the present application also provides a method for preparing an electronic cigarette core as described above, including:

S101, mixing the first zirconia powder, pore forming agent and organic additives under heating conditions to prepare a porous ceramic banbury;

S102, uniformly mixing the second zirconia powder, conductive powder and organic solvent to prepare a conductor slurry;

S103. Extruding and granulating the porous ceramic mixing material to produce injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

S104, disposing the conductor slurry on the porous ceramic body;

S105 , degreasing and sintering the porous ceramic green body provided with the conductor slurry, that is, manufacturing the electronic cigarette wick.

In the above-mentioned preparation method provided in the embodiment of the present application, firstly, the same main material zirconia powder is selected to make the porous ceramic body body and the conductor slurry. The ceramic body and the conductor slurry will not produce a large thermal stress difference, which is conducive to making the porous ceramic body and the heating element more tightly bonded; in the heated state, it can reduce the warping or even burning of the heating element Probability, thereby increasing the service life of the atomizing core. Secondly, the above-mentioned preparation method provided in the examples of the present application does not require separate sintering to prepare the porous ceramic body. When the porous ceramic body is prepared by sintering alone, the porous ceramic body may be deformed due to dimensional shrinkage during sintering. In order to ensure that the porous ceramic body The flatness of the body surface requires the steps of polishing, cleaning and drying, but the preparation method omits the steps of polishing, cleaning and drying, and the process method is simpler. Moreover, this preparation method directly prints the conductor paste onto the porous ceramic body for molding, which is beneficial to ensure the flatness of the surface during printing and the stability of the printing process, and the size of the heating element thus obtained can be made relatively Stable, which is beneficial to control the sintering shrinkage of the heating element, and improve the resistance stability and yield of the heating element. In addition, the preparation method only undergoes one-time sintering to form the atomizing core, which saves one-time sintering process compared with the prior art, which is beneficial to energy saving and environmental protection.

Further specifically, the printing may be steel screen printing or screen printing.

In the embodiment of the present application, based on the total mass of the ceramic mixing material, the mass percentage content of the pore-forming agent is 5%-30%.

In this specific example, the mass percentage content of the pore-forming agent is set at 5%-30%; the mass percentage content of the pore-forming agent will affect the porosity of the porous ceramic body. Specifically, the higher the mass percentage content of the pore-forming agent, the larger the porosity and the looser the porous ceramic body; the lower the mass percentage content of the pore-forming agent, the smaller the porosity and the denser the porous ceramic body. Therefore, the higher the mass percentage content of the pore forming agent and the greater the porosity, the faster the oil conduction speed of the porous ceramic body, and the lower the mass percentage content of the pore forming agent and the smaller the porosity, the less likely the porous ceramic body is to leak oil. In this specific example, the mass percent content of the pore-forming agent is set at 5%-30%, so as to prevent oil leakage while ensuring the oil conduction speed of the porous ceramic body.

In one embodiment, the pore forming agent includes at least one of graphite, inorganic carbon powder, particulate organic matter and organic microspheres.

The addition of a pore-forming agent can increase the porosity of the porous ceramic body; specifically, the pore-forming agent can be a single type, or a mixture of two or more types.

In one embodiment, the composition of the porous ceramic body further includes organic additives. Organic additives aid in shaping the porous ceramic body.

In one embodiment, further, the organic additive includes at least one of plastic particles, polyvinyl alcohol and paraffin.

In one embodiment, the components of the heating element further include an organic solvent. Further, the organic solvent includes at least one of terpineol, epoxy resin, butyl carbitol, ethylene glycol ether acetate and tributyl citrate.

Specifically, the organic solvent can be some organic solvents with low boiling point and volatile under normal temperature and pressure, such as at least one of the above-mentioned organic solvents; the addition of the organic solvent can make the conductive powder and the second zirconia powder mix uniformly, On the one hand, it ensures the density of the heating element, and on the other hand, it can ensure the conductivity stability and structural uniformity of the heating element.

In one embodiment, the heating temperature of the heating condition is 60-250°C.

Under heating conditions, it is beneficial to melt the organic additive and wrap the first zirconia powder and the pore-forming agent to form dense particles. Further specifically, the organic additive may be, for example, plastic particles.

In one embodiment, the temperature of the degreasing treatment is not higher than 500° C.; the heating rate of the degreasing treatment is 0.1-2° C./min.

The degreasing treatment under the above conditions is beneficial to prevent deformation or cracking of the finished atomizing core.

In one embodiment, the sintering is atmosphere sintering, and the gas introduced into the atmosphere sintering is a mixed gas of H ₂ and N ₂ .

In this specific example, _H2 provides a reducing atmosphere, while _N2 provides a protective atmosphere, and the above-mentioned atmosphere sintering is carried out in an atmosphere furnace. Since the conductive powder is generally metal powder or metal alloy powder, in the case of high-temperature sintering, the conductive powder is easy to react with oxygen in the sintering atmosphere to form metal oxides, which will reduce the conductivity of the heating element. Therefore, when the mixed gas of _H2 and _N2 is introduced into the atmosphere furnace, the hydrogen and nitrogen will not react with the metal powder, which can form a good protection for the conductive powder and ensure the conductivity of the heating element.

In one embodiment, the sintering is vacuum sintering, and the vacuum degree of the vacuum sintering is not greater than 1Pa.

In this specific example, the sintering is carried out in a vacuum environment with a vacuum degree not greater than 1 Pa, and the conductive powder can also be well protected in a vacuum state.

In one embodiment, further, the sintering temperature is 1200-1600°C.

If the sintering temperature is too low, it will easily lead to insufficient strength of the finished atomizing core, while if the sintering temperature is too high, the shrinkage rate of the finished atomizing core will be too large and the porosity will be reduced; therefore, the sintering temperature should be set within the above range in order to avoid the above problems.

The embodiment of the present application further provides an electronic cigarette, which includes the above-mentioned electronic cigarette core. The electronic cigarette atomization core includes a porous ceramic body and a heating element, the porous ceramic body has a liquid absorbing surface and an atomizing surface, and the heating element is embedded in the atomizing surface; the materials of the porous ceramic body and the heating element are close to each other . The electronic cigarette has a relatively high service life.

The application will be further described below by specific examples and comparative examples:

Example 1

S101. Mix the first zirconia powder with an average particle size of 100 μm, a pore-forming agent, and plastic particles under a heating condition of 200° C. to prepare a porous ceramic banbury; wherein, in the first zirconia powder , containing 90% zirconia, 5% hafnium oxide and 5% yttrium oxide;

S102, mixing the second zirconia powder with an average particle size of 0.3 μm, 37.5wt% of zirconia, 12.5wt% of titanium nitride, 21.25wt% of titanium carbide, 3.75wt% of nickel oxide and 25wt% of epoxy resin Homogenously, a conductor slurry is obtained; wherein, in the second zirconia powder, 90% of zirconia, 5% of hafnium oxide and 5% of yttrium oxide are included;

S103. Extruding and granulating the porous ceramic mixing material to produce injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

S104, printing the conductor paste onto the porous ceramic body;

S105. Degreasing the porous ceramic green body printed with the conductor paste and then sintering to produce the electronic cigarette core; wherein, the temperature of the degreasing treatment is 450° C., and the heating rate is 1.5° C./min. The holding time is 2 hours; the sintering is atmosphere sintering, the sintering temperature is 1300° C., and the holding time is 2 hours.

Example 2

S101. Mix the first zirconia powder with an average particle size of 80 μm, a pore-forming agent, and plastic particles under a heating condition of 150° C. to prepare a porous ceramic banbury; wherein, in the first zirconia powder , containing 83% zirconia, 7% hafnium oxide and 10% yttrium oxide;

S102, mixing the second zirconia powder with an average particle size of 0.2 μm, 22.5wt% of zirconia, 17.5wt% of titanium nitride, 29.75wt% of titanium carbide, 5.25wt% of nickel oxide and 25wt% of epoxy resin Homogenously, a conductor slurry is prepared; wherein, in the second zirconia powder, 95% of zirconia, 2% of hafnium oxide and 3% of yttrium oxide are included;

S103. Extruding and granulating the porous ceramic mixing material to produce injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

S104, printing the conductor paste onto the porous ceramic body;

S105. Degreasing the porous ceramic green body printed with the conductor paste and then sintering to produce the electronic cigarette core; wherein, the temperature of the degreasing treatment is 450° C., and the heating rate is 1.5° C./min. The holding time is 2 hours; the sintering is atmosphere sintering, the sintering temperature is 1300° C., and the holding time is 2 hours.

Example 3

S101. Mix the first zirconia powder with an average particle size of 60 μm, a pore-forming agent, and plastic particles under a heating condition of 150° C. to prepare a porous ceramic banbury; wherein, in the first zirconia powder , containing 95% zirconia, 1% hafnium oxide and 4% yttrium oxide;

S102, mixing the second zirconia powder with an average particle size of 0.15 μm, 7.5wt% of zirconia, 22.5wt% of titanium nitride, 38.25wt% of titanium carbide, 6.75wt% of nickel oxide and 25wt% of epoxy resin Homogenously, a conductor slurry is prepared; wherein, in the second zirconia powder, 83% of zirconia, 6% of hafnium oxide and 11% of yttrium oxide are included;

S103. Extruding and granulating the porous ceramic mixing material to produce injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

S104, printing the conductor paste onto the porous ceramic body;

S105. Degreasing the porous ceramic green body printed with the conductor paste and then sintering to produce the electronic cigarette core; wherein, the temperature of the degreasing treatment is 500° C., and the heating rate is 0.1° C./min. The holding time is 2 hours; the sintering is vacuum sintering, the sintering temperature is 1200° C., and the holding time is 2 hours.

Example 4

S101. Mix the first zirconia powder with an average particle size of 45 μm, a pore-forming agent, and plastic particles under a heating condition of 250° C. to prepare a porous ceramic banbury; wherein, in the first zirconia powder , containing 92% zirconia, 5% hafnium oxide and 3% yttrium oxide;

S102, the average particle size is 0.05μm, 17.5wt% of the second zirconia powder, 10wt% of titanium nitride, 50wt% of titanium carbide, 10wt% of nickel powder, 2.5% of nickel oxide and 10wt% of ring Oxygen resin is mixed uniformly to prepare conductor paste; wherein, in the second zirconia powder, 85% of zirconia, 10% of hafnium oxide and 5% of yttrium oxide are included;

S103. Extruding and granulating the porous ceramic mixing material to produce injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

S104, printing the conductor paste onto the porous ceramic body;

S105. Degreasing the porous ceramic green body printed with the conductor paste and then sintering it to form the electronic cigarette core; wherein, the temperature of the degreasing treatment is 450° C., and the heating rate is 2° C./min. The holding time is 2 hours; the sintering is atmosphere sintering, the sintering temperature is 1600° C., and the holding time is 2 hours.

Example 5

S101. Mix the first zirconia powder with an average particle size of 150 μm, a pore-forming agent, and plastic particles under a heating condition of 60° C. to prepare a porous ceramic banbury; wherein, in the first zirconia powder , containing 87% zirconia, 8% hafnium oxide and 5% yttrium oxide;

S102, uniformly mix the second zirconia powder with an average particle size of 0.5 μm, 7.5wt% of zirconia, 27.5wt% of titanium nitride, 55wt% of titanium carbide and 10wt% of epoxy resin to prepare a conductor paste ; Wherein, in the second zirconia powder, 92% of zirconia, 4% of hafnium oxide and 4% of yttrium oxide are included;

S103. Extruding and granulating the porous ceramic mixing material to produce injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

S104, printing the conductor paste onto the porous ceramic body;

S105. Degreasing the porous ceramic green body printed with the conductor paste and then sintering to produce the electronic smog core; wherein, the temperature of the degreasing treatment is 450° C., and the heating rate is 1° C./min. The holding time is 2 hours; the sintering is atmosphere sintering, the sintering temperature is 1400° C., and the holding time is 2 hours.

Example 6

S101. Mix the first zirconia powder with an average particle size of 70 μm, a pore-forming agent, and plastic particles under a heating condition of 150° C. to prepare a porous ceramic banbury; wherein, in the first zirconia powder , containing 90% zirconia, 5% hafnium oxide and 5% yttrium oxide;

S102, the second zirconia powder with an average particle size of 0.1 μm, 31wt%, 10wt% titanium nitride, 20wt% titanium carbide, 3wt% nickel powder, 4wt% nickel oxide, 1wt% boride Titanium, 2wt% of molybdenum disilicide, 1wt% of molybdenum powder, 3wt% of tungsten powder and 25wt% of epoxy resin are mixed uniformly to prepare conductor slurry; wherein, in the second zirconia powder, 90 % zirconia, 5% hafnium oxide and 5% yttrium oxide;

S103. Extruding and granulating the porous ceramic mixing material to obtain an injection molding feed, and then making the porous ceramic body green body through an injection molding process on the injection molding feed;

S104, printing the conductor paste onto the porous ceramic body;

S105. Degreasing and sintering the porous ceramic green body printed with the conductor paste to form the electronic cigarette core; wherein, the temperature of the degreasing treatment is 450° C., and the heating rate is 1.2° C./min. The holding time is 2 hours; the sintering is atmosphere sintering, the sintering temperature is 1300° C., and the holding time is 2 hours.

Comparative example 1

S101, mixing the first zirconia powder with an average particle size of 60 μm, a pore-forming agent, and plastic particles under heating conditions of 150° C. to prepare a porous ceramic banbury;

S102, mixing evenly the glass powder of 7.5wt%, the titanium nitride of 22.5wt%, the titanium carbide of 38.25wt%, the nickel oxide of 6.75wt% and the epoxy resin of 25wt%, the conductor slurry is obtained;

S103. Extruding and granulating the porous ceramic mixing material to produce injection molding feed, and then making the porous ceramic body green body through injection molding process on the injection molding feed;

S104, printing the conductor paste onto the porous ceramic body;

S105. Degreasing the porous ceramic green body printed with the conductor paste and then sintering to form the electronic cigarette core; wherein, the temperature of the degreasing treatment is 450°C, and the heating rate is 1°C/min , the holding time is 2h; the sintering is atmosphere sintering, the sintering temperature is 1300°C, and the holding time is 2h.

Performance Testing

Count the sintering yields of the samples of the examples and the comparative examples, and sinter the electronic cigarette cores obtained by sintering the examples and the comparative examples respectively, and connect the power supply to carry out the dry burning experiment at the same power. The specific test method is as follows:

Heating element roasting yield test: At room temperature, use a resistance meter to test the resistance of the sample heating element. If the resistance is less than 1.5Ω, it is a good product. Test 100 samples. The number of good products is n, and the good product rate is n/100*100%.

Dry burning times test: use a standard power supply for testing, with a constant output power of 6.5w, power on for 3s, and then power off for 3s to cool naturally, which is dry burning once. Repeat the above process for power on and off tests until the heating element cracks. Stop, the number of times at this time is the number of times of dry burning. Take 30 samples for testing, and record the dry burning test of the samples respectively. The average number of dry burning times of the 30 samples is the average number of dry burning times of the program.

The results are shown in Table 1:

Table 1:

group Yield rate of heating element roasting Average times of dry burning Example 1 100% 60 burnouts Example 2 90% 40 burnouts Example 3 60% 30 burnouts Example 4 70% 55 burnouts Example 5 55% 32 burnouts Example 6 95% 55 burnouts Comparative example 1 10% 15 burnouts

From the test results in Table 1, it can be seen that the electronic cigarette coil provided by the embodiment of the present application has a high yield rate of the heating element, and can effectively prevent dry burning, thereby increasing the service life of the atomizer core.

Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, rather than limiting the scope of the present application. Those skilled in the art will appreciate that modifications can be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims (20)

1. The electronic cigarette atomization core is characterized by comprising a porous ceramic body and a heating body arranged on the porous ceramic body, wherein the components of the porous ceramic body comprise first zirconia powder, the components of the heating body comprise second zirconia powder and conductive powder, and the average grain size of the first zirconia powder is larger than that of the second zirconia powder.

2. The electronic cigarette atomizing core of claim 1, wherein the average particle size of the first zirconia powder is 25-200 μιη and the average particle size of the second zirconia powder is 0.05-0.5 μιη.

3. The electronic cigarette atomizing core of claim 2, wherein the average particle size of the first zirconia powder is 45-80 μm and the average particle size of the second zirconia powder is 0.05-0.2 μm.

4. The electronic cigarette atomizing core of claim 1, wherein the first zirconia powder comprises zirconia, hafnia, yttria; the second zirconia powder comprises zirconia, hafnium oxide and yttrium oxide.

5. The electronic cigarette atomizing core of claim 4, wherein the first zirconia powder comprises 83-95% zirconia by mass based on the total mass of the porous ceramic body; and taking the total mass of the heating element as a reference, wherein the mass percentage content of zirconia in the second zirconia powder is 83-95%.

6. The electronic cigarette atomizing core of claim 1, wherein the porous ceramic body has a porosity of 30% -70%.

7. The electronic cigarette atomizing core of claim 1, wherein the heat generating body has a porosity of 0% -2%.

8. The electronic cigarette atomizing core of claim 1, wherein the conductive powder comprises at least two of titanium nitride, titanium carbide, nickel powder, nickel oxide, titanium boride, molybdenum disilicide, molybdenum powder, and tungsten powder.

9. The electronic cigarette atomizing core of claim 8, wherein in the conductive powder, the titanium nitride is 10% -40% by mass, the titanium carbide is 20% -60% by mass, the nickel powder is 0% -10% by mass, the nickel oxide is 0% -10% by mass, the titanium boride is 0% -5% by mass, the molybdenum disilicide is 0% -5% by mass, the molybdenum powder is 0% -5% by mass, and the tungsten powder is 0% -5% by mass.

10. A method of preparing an electronic vaping core according to any one of claims 1 to 9, comprising:

mixing the first zirconia powder, the pore-forming agent and the organic additive under the heating condition to prepare a porous ceramic banburying material;

uniformly mixing the second zirconia powder, the conductive powder and the organic solvent to prepare a conductive slurry;

preparing injection molding feed from porous ceramic banburying material by extrusion granulation process, and preparing porous ceramic body blank from the injection molding feed by injection molding process;

disposing the conductor paste on the porous ceramic body blank;

and degreasing the porous ceramic body blank provided with the electric conductor slurry, and sintering to obtain the electronic cigarette atomization core.

11. The method for preparing an electronic cigarette atomizing core according to claim 10, wherein the mass percentage content of the pore-forming agent is 5% -30% based on the total mass of the ceramic banburying material.

12. The method for preparing an electronic cigarette atomizing core according to claim 11, wherein the pore-forming agent comprises at least one of graphite, inorganic carbon powder, particulate organic matter, and organic microspheres.

13. The method of preparing an e-cig atomizing core according to claim 11, wherein the organic additive comprises at least one of plastic particles, polyvinyl alcohol, and paraffin wax.

14. The method for preparing an electronic cigarette atomizing core according to claim 11, wherein the organic solvent comprises at least one of terpineol, epoxy resin, butyl carbitol, glycol ethyl ether acetate, and tributyl citrate.

15. The method for preparing an electronic cigarette atomizing core according to claim 11, wherein the heating temperature of the heating condition is 60-250 ℃.

16. The method for preparing an electronic cigarette atomizing core according to claim 11, wherein the degreasing treatment temperature is not higher than 500 ℃; the temperature rising speed of the degreasing treatment is 0.1-2 ℃/min.

17. The method for preparing an electronic cigarette atomized core according to claim 11, wherein the sintering is atmosphere sintering, and the gas introduced into the atmosphere sintering is H ₂ And N ₂ Is a mixed gas of (a) and (b).

18. The method for preparing an electronic cigarette atomizing core according to claim 11, wherein the sintering is vacuum sintering, and a vacuum degree of the vacuum sintering is not more than 1Pa.

19. The method for preparing an electronic cigarette atomizing core according to claim 11, wherein the sintering temperature is 1200-1600 ℃.

20. An electronic cigarette, characterized in that it comprises an electronic cigarette atomizing core according to any one of claims 1 to 9.