CN111838766A - PTC heating element and low-temperature smoking set - Google Patents

PTC heating element and low-temperature smoking set Download PDF

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Publication number
CN111838766A
CN111838766A CN201910292394.5A CN201910292394A CN111838766A CN 111838766 A CN111838766 A CN 111838766A CN 201910292394 A CN201910292394 A CN 201910292394A CN 111838766 A CN111838766 A CN 111838766A
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ceramic substrate
ptc
ptc ceramic
heating element
additive
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刘建福
钟科军
郭小义
黄炜
尹新强
易建华
洪国明
李志红
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China Tobacco Hunan Industrial Co Ltd
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China Tobacco Hunan Industrial Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders

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Abstract

The invention discloses a PTC heating element, which comprises an insulating base and a heating element body, wherein the heating element body comprises a PTC ceramic substrate and a pair of electrode plates arranged on two sides of the ceramic substrate, one end of the heating element body is inserted into a mounting hole in the base in a matching mode, and the PTC ceramic substrate is tightly held by the pair of electrode plates through the limitation of the inner wall of the mounting hole. During the equipment, with the metal electrode piece card on PTC ceramic substrate's flange and match the interference together and insert the mounting hole on the base, the metal electrode piece is held the PTC ceramic substrate tightly because of the restriction of mounting hole inner wall to realize the assembly connection of electrode piece and PTC ceramic substrate, be equipped with the lead connector that extends to outside the base on the metal electrode piece, not only simple structure has the convenient and fast characteristics of equipment moreover, has reduced the cost of manufacture of heat-generating body.

Description

PTC heating element and low-temperature smoking set
Technical Field
The invention belongs to the technical field of smoking articles, and particularly relates to a PTC heating element and a low-temperature smoking set.
Background
Compared with the traditional cigarette, the heating non-combustion smoking device directly heats the tobacco or nicotine product at the temperature of 220-250 ℃, and the smoke gradually volatilizes after baking, thereby reducing harmful smoke components generated by combustion and thermal degradation of the tobacco in the traditional cigarette.
The heating of the incombustible product can be divided into surrounding heating and center heating in form, and various heating techniques such as ceramic heating, film heating, electromagnetic heating and the like have been developed based on the electric heating principle. The traditional heating element is mostly made of metal or alloy materials, specific voltage is needed in the using process, the heat loss of the heating element is easily caused when the rated voltage is exceeded, and the metal or alloy heating element is unstable in constant temperature state, poor in thermal stability and short in service life.
Chinese patent 200820040874.X discloses a PTC heating element, which comprises a PTC ceramic heating sheet, an upper and a lower heat-conducting metal sheets on the front and back sides of the heating sheet, 2 leads electrically connected with the upper and the lower heat-conducting metal sheets respectively, and a heat-resistant insulating part encapsulated outside the whole body, wherein silver paste binder layers are respectively arranged between the heating sheet and the upper and the lower heat-conducting metal sheets. This kind of PTC heating element, the sheetmetal that will punch forming is bonded with PTC heating piece after high temperature toasts, then rivets the wire on the sheetmetal link, and the equipment is very inconvenient, has increased economic cost, moreover because this kind of PTC heating element need use electrically conductive silver thick liquid, and long-time high temperature makes electrically conductive silver thick liquid rotten, brings the potential safety hazard.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, an object of the present invention is to provide a PTC heater and a low temperature smoking set which are simple in structure and easy to assemble.
In order to solve the technical problems, the invention adopts the following technical scheme:
the PTC heating body comprises an insulating base and a heating body, wherein the heating body comprises a PTC ceramic substrate and a pair of electrode plates arranged on two opposite sides of the ceramic substrate, one end of the heating body is matched and inserted into a mounting hole in the base, and the PTC ceramic substrate is tightly held by the pair of electrode plates.
With PTC ceramic substrate centre gripping between two electrode slices, then insert the mounting hole on the base together, utilize the restriction of mounting hole inner wall, hold PTC ceramic substrate tightly through two electrode slices, realize the equipment connection of electrode slice and PTC ceramic substrate, heat-generating body simple structure has the characteristics of equipment convenient and fast moreover, has reduced the cost of manufacture of heat-generating body.
The PTC ceramic substrate comprises the following components: a main crystal phase raw material, a semi-conducting additive, a Curie temperature shifting agent, a main additive, a sintering aid and a lead volatilization inhibitor; wherein:
The main crystal phase is selected from BaCO3、TiO2、BaTiO3、V2O5One or more of BN;
the semiconducting additive is selected from rare earth oxide, Y-Nb, Sb-Nb, Bi-Nb, Y (NO)3)3˙6H2One or more of O;
the Curie temperature shifting agent is selected from PbO and Pb3O4、PbCO3Or PbTiO3One or more of;
the main additive is selected from Mn (NO)3)2Or MnO;
the sintering aid is selected from SiO2、Al2O3、TiO2、Bi2O3、CaCO3、Sb2O3、BN、Li2CO3One or more of;
MgO is used as lead volatilization inhibitor.
Further, the PTC ceramic base material is sheet-shaped, flanges are arranged on two sides of the PTC ceramic base material, strip-shaped clamping grooves matched with the flanges are arranged on the electrode plates, and the electrode plates are assembled and connected with the PTC ceramic base material through the clamping grooves.
Furthermore, the PTC ceramic substrate is in a sheet shape, and the pair of electrode plates are flatly attached to the front side and the back side of the PTC ceramic substrate.
Further, the PTC ceramic substrate is rod-shaped, two opposite side walls of the PTC ceramic substrate are provided with axially extending grooves, and the electrode plates are installed in the grooves in a matched mode.
The PTC heating element comprises an insulating base and a heating element body arranged on the insulating base, wherein the heating element body comprises a PTC ceramic substrate and a pair of electrode plates integrally solidified and formed in the PTC ceramic substrate, and one end of each electrode plate extends out of the PTC ceramic substrate to form a lead connector.
The electrode plate is directly embedded in the PTC ceramic substrate and integrally solidified and formed with the PTC ceramic substrate, when the heating body is assembled, only the heating body needs to be inserted into the mounting hole in the substrate, the electrode plate and the PTC ceramic substrate do not need to be assembled, the use is convenient and quick, and in addition, the electrode plate can be in close contact with the PTC ceramic substrate, and the stability of electric contact is ensured.
Furthermore, a pair of the electrode plates are arranged in parallel and separated.
Further, the electrode plate is arranged close to the outer wall of the PTC ceramic substrate.
The PTC heating element comprises an insulating base and a heating element body arranged on the insulating base, wherein the heating element body comprises a flaky PTC ceramic substrate and two layers of printed electrode plates printed on the front side and the back side of the PTC ceramic substrate by adopting a slurry printing process.
The electrode plate is directly printed on the base material by adopting a paste printing process, and when the heating body is assembled, only the heating body needs to be inserted into the mounting hole in the base material, the electrode plate and the PTC ceramic base material do not need to be assembled, so that the use is convenient and quick.
Furthermore, the electrode plate is made of Pt, Pd, Ag-Pd or Au.
A low-temperature smoking set comprises the PTC heating element.
In a word, compared with the prior art, the device has the advantages of simple structure and convenience and quickness in assembly.
Drawings
FIG. 1 is an isometric view of example 1;
FIG. 2 is a front sectional view of embodiment 1;
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is an exploded view of example 1;
FIG. 5 is an isometric view of example 2;
FIG. 6 is an exploded view of example 2;
FIG. 7 is an isometric view of example 3;
FIG. 8 is a front sectional view of embodiment 3;
FIG. 9 is an exploded view of example 3;
FIG. 10 is an isometric view of example 4;
FIG. 11 is an exploded view of example 4;
FIG. 12 is an isometric view of a first embodiment of example 5;
FIG. 13 is a front sectional view of the first embodiment of example 5;
FIG. 14 is an exploded view of the first embodiment of example 5;
figure 15 is an isometric view of a second embodiment of example 5;
fig. 16 is an exploded view of the second embodiment of example 5.
Detailed Description
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 4, the PTC heating element of the present embodiment comprises an insulating base 1 and a heating element body 2, which comprises a (positive temperature coefficient) PTC ceramic substrate 201 and a pair of metal electrode sheets 202 disposed on both sides of the ceramic substrate.
PTC ceramic substrate 201 is the slice and two sides have flange 2011 in this embodiment, be equipped with on the metal electrode slice 202 with flange 2011 assorted rectangular form draw-in groove 2021, can block metal electrode slice 202 at two sides of PTC ceramic substrate, form two structures of hugging closely with PTC ceramic substrate slice 201 both sides limit, make two metal electrode slices 202 cladding on two sides of substrate and keep in close contact with PTC ceramic substrate, when circular telegram the heat-generating body through the metal electrode slice, two sides circulation of current from PTC ceramic substrate 201, the area of metal electrode slice 202 cladding is big a little on PTC ceramic substrate, be favorable to reducing contact resistance. As the PTC ceramic substrate, an existing PTC ceramic substrate such as BaTiO 3-based PTC ceramic substrate can be used, and the description thereof is omitted.
During the equipment, with metal electrode slice 202 card on PTC ceramic substrate 201's flange and match the interference together and insert the mounting hole 3 on the base, metal electrode slice 202 holds PTC ceramic substrate 201 because of the restriction of 3 inner walls of mounting hole to realize electrode slice and PTC ceramic substrate 201's equipment connection, be equipped with on the metal electrode slice 202 and extend to the outer lead connector 4 of base, thereby conveniently be connected with the power through the wire. The heating body of the embodiment has the advantages of being simple in structure, convenient and fast to assemble and capable of reducing manufacturing cost of the heating body.
The components of the PTC ceramic substrate in this example included: the main crystal phase raw material, the semi-conducting additive, the Curie temperature shifting agent, the main additive, the sintering aid and the lead volatilization inhibitor.
The main crystal phase is a main crystal structure constituting the PTC element, and is a ceramic body composed of polycrystals, and the main crystal phases are different and correspond to different crystal structures. Such as BaTiO3The crystal structure of the base PTC element is ABO3Perovskite structure, in which chains of titanium ions are formedThe built-in electric field is generated to make the titanium ions generate micro displacement, the crystal is changed into an amorphous cubic phase in a certain temperature area and spontaneous polarization is caused, which is an important reason that the element has PTC effect, and different crystalline phases correspond to different polycrystalline structures, thereby having different phase change points.
The semiconducting additive can change the conductivity of the main crystalline phase to achieve a change in resistance values up to several orders of magnitude, i.e. to meet the low resistivity requirements. Specifically, the crystal grain resistivity is reduced mainly by substituting the main crystal phase crystal grain atoms in a substitutional mode, namely, a certain concentration of carrier ions are generated in the crystal grains, and the proper combination has better performance than a single additive.
The effect of the acceptor additive: realizing high lift-drag ratio and high temperature coefficient; the lift-to-drag ratio is a core parameter of the PTC effect of the PTC element and is defined as the ratio of the maximum resistance value after the step change to the minimum resistance value before the step change. The higher the lift-drag ratio, the better the temperature control performance of the element and the higher the safety. The resistance temperature coefficient is used for representing the changing capability of the resistance value of the element under the condition of zero power along with the temperature change, determines the response time of the PTC serving as a protection element, and needs a high temperature coefficient in the occasion of needing quick response. Since effective conduction paths cannot be formed in the element if the grain boundaries do not become semiconducting properly and a high degree of insulation is maintained after the grains are semiconducting, the addition of acceptor impurities to the grain boundaries is also an important step in the semiconducting process, and the acceptor additives mainly act on the grain boundaries and are often added as secondary additives after the pre-firing process, thereby reducing the chance of entering the grains and improving the addition efficiency.
The Curie temperature shifting agent has the functions that the rated temperature point of the PTC ceramic electric heating element can be set by adjusting the formula of raw materials, the Curie point of the PTC ceramic heating element can be adjusted by chemical additives during manufacturing, and the Curie point can be selected within the range of 20-300 ℃.
In this embodiment, no silver paste binder layer is arranged between the metal electrode plate 202 and the substrate, so that the PTC ceramic substrate can be broken down to generate heat by ensuring the voltage between the metal electrode plate 202, and the temperature requirement of cigarette heating is met, and special requirements are provided for the selection of the components of the PTC ceramic substrate.
In this example, the main crystal phase is selected from BaCO3、TiO2、BaTiO3、V2O5And BN. Because the main crystal phase is made of TiO2、BaTiO3、V2O5And various oxides are sintered, most of the oxides have wide forbidden band width, so that the oxides are generally insulators at normal temperature. Therefore, when electrical properties are required, a process of semiconducting is required.
For example: high purity BaTiO3The porcelain mainly aims at Ba and Ti during the semi-conduction, and the basic principle is to respectively utilize Ba and Ti2+And Ti4+The high valence metal ions (mostly rare earth element ions) with similar ion radii replace the two ions, and the semi-conduction principle is as follows:
BaTiO3+xMe3+→Ba2+ 1-xMe3+ x(Ti4+ 1-xTi3+ x)O3+xBa2+
BaTiO3+xMe5+→Ba2+(Ti4+ 1-xTi3+ xMe5+ x)O3+xTi4+。
The semiconducting additive of this example was selected from the group consisting of rare earth oxides, Y-Nb, Sb-Nb, Bi-Nb, Y (NO)3)3˙6H2One or more of O.
In order to meet the heating requirement of cigarette, Mn (NO) is adopted as the main additive in the embodiment3)2Or MnO; the segregation of Mn in the grain boundary is utilized to reduce the size of the grain and promote the oxidation of the grain boundary, and the acceptor state density is increased when the segregation is combined with an existing acceptor such as adsorbed oxygen or cation vacancy, so that the grain boundary potential barrier is effectively improved to enhance the PTC effect, namely the lift-drag ratio is increased; in addition, the introduction of Mn can improve the temperature coefficient of the PTC material, because the increased segregation acceptors on the grain boundary can increase the grain boundary thickness and the barrier height along with the increase of Mn content, thereby obtaining a larger temperature coefficient.
In this example, the raw materials are bakedThe bonding assistant is selected from SiO2、Al2O3、TiO2、Bi2O3、CaCO3、Sb2O3、BN、Li2CO3One or more of (a). The sintering aid can limit manganese on a crystal boundary, and further can improve the lift-drag ratio and the temperature coefficient of the base material. In addition, the sintering aid can form a eutectic liquid phase at the temperature of more than 1240 ℃ in the product sintering process, and impurities harmful to the semi-conduction, such as K, Na, Al, Mg and the like, enter the liquid phase along with the migrated crystal boundary, so that the acceptor state is reduced, and the semi-conduction is easy to realize; the growth of crystal grains can be inhibited, so that the crystal grains are fine and uniform, and the voltage sensitivity of the resistor is reduced; the sintering temperature is reduced and the sintering temperature zone of the semi-conduction is widened.
In order to meet the temperature requirement of cigarette heating, the Curie temperature shifting agent is selected from PbO and Pb in the embodiment3O4、PbCO3Or PbTiO3One or more of; by adding lead, the Curie point can reach 250 ℃ or even higher when moving to high temperature, thereby meeting the requirement of the heating temperature of cigarettes.
Because the base material contains lead which is a highly toxic substance, in order to prevent the volatilization of lead, the lead volatilization inhibitor in the embodiment adopts MgO, and the volatilization of lead is inhibited by utilizing the physicochemical property of MgO, so that the requirement of environmental protection is met.
The cross section of the metal electrode plate 202 is preferably designed into a V shape, the flange is clamped in the V-shaped clamping groove, and when the metal electrode plate is in interference fit, two side walls of the metal electrode plate shrink inwards due to the limitation of the mounting hole to clamp the ceramic substrate.
In order to facilitate the insertion of the heating body into the mounting hole, a guide inclined surface is designed at the end of the metal electrode plate 202 inserted into the base 1.
Usually, the PTC ceramic substrate 201 has an average linear expansion coefficient of 10-7Because of the fact that the average linear expansion coefficient of the metal electrode sheet 202 is as close as possible to that of the PTC ceramic substrate 201, it is preferable to select a metal foil of stainless steel such as S40310, S41617, S46250, S47310, and S47410, or a low expansion coefficient such as molybdenum, platinum, and iridium.
The PTC ceramic substrate 201 has a thermal conductivity of 48w/(m · k), and considering the heat conduction and utilization rate of the PTC heater, the metal electrode sheet 202 has a high thermal conductivity, which is advantageous for heat transfer, and molybdenum and iridium have high thermal conductivities of 140w/(m · k) or more, and stainless steel has a thermal conductivity of 21 to 27w/(m · k), which is relatively slightly lower, and therefore, molybdenum and iridium are preferably selected as materials for manufacturing the metal electrode sheet 202.
Example 2
Referring to fig. 5 and 6, the difference from embodiment 1 is that in this embodiment, the metal electrode sheet 202 is flatly attached to the front and back sides of the sheet-shaped PTC ceramic substrate 201, and in the heating element body of this connection structure, the contact area between the metal electrode sheet 202 and the PTC ceramic substrate 201 is large, so that the contact resistance can be effectively reduced.
Example 3
Referring to fig. 7 and 8, unlike embodiment 1, in this embodiment, a semiconductor ceramic rod is used as the PTC ceramic substrate 201, two opposite side walls of the rod-shaped PTC ceramic substrate 201 are provided with elongated grooves 5 extending in the axial direction, the two metal electrode plates 202 are both arc-shaped and can match the elongated grooves 5 of the semiconductor ceramic rod 201, and after the metal electrode plates 202 are covered on the semiconductor ceramic rod, the outer surface of the metal electrode plates 202 and the outer surface of the ceramic rod are substantially smoothly connected to form an integral body.
As shown in fig. 9, a mounting hole 3 is formed in the base 1, the semiconductor ceramic rod is inserted into the mounting hole 3 by interference, and a portion of the metal electrode sheet 202 covering the semiconductor ceramic rod extends out of the base to form two exposed lead connectors 4.
Example 4
Referring to fig. 10 and 11, unlike embodiment 2, in this embodiment, two-layer electrodes are printed on the front and back surfaces of a sheet-shaped PTC ceramic substrate 201 by a paste printing process to form a printed electrode sheet 202 covering the front and back surfaces of the PTC ceramic substrate 201.
In this embodiment, a current is applied to the heating element through the printed electrode sheet 202, the current flows in through one printed electrode sheet 202, passes through the PTC ceramic substrate 201, and flows out through the other printed electrode sheet 202, the PTC ceramic substrate 201 with the positive temperature coefficient generates heat after being electrified, and transmits part of the heat to the printed electrode sheet 202, so that the PTC ceramic substrate with the positive temperature coefficient and the printed electrode sheet serve as heating elements to form a durable heating element with fast heat generation and good thermal stability.
For the printed electrode sheet 202, the metal layer on the surface thereof needs to be stable and have good ohmic contact with the PTC ceramic substrate, which is a key component of the heating element, so that the noble metals Pt, Pd, Ag — Pd, Au, which are relatively mature in electrode technology, must be used as the electrodes.
The electrode plate of the embodiment is directly printed on the base material by adopting a slurry printing process, and when the heating body is assembled, only the heating body is required to be inserted into the mounting hole in the base material, the electrode plate 202 and the PTC ceramic base material 201 do not need to be assembled independently, so that the use is convenient and quick.
Example 5
Referring to fig. 12 to 14, unlike embodiment 1, the heating element body of this embodiment includes a rod-shaped PTC ceramic base material 201 and a pair of electrode tabs 202 integrally formed in the PTC ceramic base material 201 in a solid-state manner, and one end of each of the pair of electrode tabs 202 extends out of the PTC ceramic base material 201 to form a lead tab 4.
In actual design, guarantee two sheet metal electrode 202 parallel arrangement, and the two physical contact does not take place to, sheet metal electrode guarantees to the utmost that to be close to the outer wall of PTC ceramic substrate, will have more PTC ceramic material between two sheet metal electrode promptly, makes the electric current through sheet metal electrode can pass the very big part of PTC ceramic substrate, ensures that the overwhelming majority of PTC ceramic substrate all is work area, improves the utilization ratio, thereby ensures its rate of generating heat.
The sintering temperature of the PTC ceramic substrate is usually 1200 ℃, the embedded metal electrode plate is integrally sintered with the PTC ceramic substrate, so the melting point of the embedded metal electrode plate is higher than 1200 ℃, and considering that the metal electrode plate is an electrode pin, high-melting-point metals such as Pt (1768 ℃), Pd (1555 ℃), Ni (1453 ℃) and the like are preferably selected, and meanwhile, in order to avoid the oxidation of the metal electrode plate during co-firing, the metal electrode plate is preferably sintered in a reducing atmosphere or a protective gas atmosphere.
This embodiment is with direct pre-buried rather than integrative consolidation shaping of electrode slice in PTC ceramic substrate, during the heat-generating body equipment, only need with the heat-generating body insert the base in the mounting hole can, need not to assemble electrode slice and PTC ceramic substrate, convenient to use is quick, in addition, the electrode slice can keep in close contact with PTC ceramic substrate, guarantees the stability of electrical contact.
In this embodiment, a metal electrode sheet made of Ni or Ti is preferred, because Ni or Ti utilizes the TCR coefficient to automatically control temperature, which avoids printing electrodes and does not increase structural members; meanwhile, the heating wire heats quickly, can reach the preset temperature instantly, and can reach the target temperature in a shorter time with the PTC heating wire, the melting points of the nickel or the titanium are 1453 and 1660 ℃ respectively, which is far higher than the sintering temperature of the ceramic body, so that the heating wire can be co-fired with the PTC ceramic substrate.
Referring to fig. 15 and 16, in practical applications, the PTC ceramic substrate may also be designed in a sheet shape.
A low temperature smoking set adopts the PTC heating element of the embodiment 1-5, the lead connector of the PTC heating element is electrically connected with the PCB of the low temperature smoking set through a welding wire, and other structures of the low temperature smoking set can adopt the existing structures, which are not the key points of the improvement of the application and are not repeated.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (10)

  1. A PTC heating element, characterized in that: the heating body comprises a PTC ceramic substrate and a pair of electrode plates arranged on two opposite sides of the ceramic substrate, one end of the heating body is inserted into a mounting hole in the substrate in a matching manner, and the PTC ceramic substrate is tightly held by the pair of electrode plates;
    the PTC ceramic substrate comprises the following components: a main crystal phase raw material, a semi-conducting additive, a Curie temperature shifting agent, a main additive, a sintering aid and a lead volatilization inhibitor; wherein:
    the main crystal phase is selected from BaCO3、TiO2、BaTiO3、V2O5One or more of BN;
    the semiconducting additive is selected from rare earth oxide, Y-Nb, Sb-Nb, Bi-Nb, Y (NO)3)3˙6H2One or more of O;
    the Curie temperature shifting agent is selected from PbO and Pb3O4、PbCO3Or PbTiO3One or more of;
    the main additive is selected from Mn (NO)3)2Or MnO;
    the sintering aid is selected from SiO2、Al2O3、TiO2、Bi2O3、CaCO3、Sb2O3、BN、Li2CO3One or more of;
    MgO is used as lead volatilization inhibitor.
  2. 2. A PTC heat-generating body according to claim 1, characterized in that: the PTC ceramic substrate is sheet-shaped, flanges are arranged on two sides of the PTC ceramic substrate, strip-shaped clamping grooves matched with the flanges are arranged on the electrode plates, and the electrode plates are assembled and connected with the PTC ceramic substrate through the clamping grooves.
  3. 3. A PTC heat-generating body according to claim 1, characterized in that: the PTC ceramic substrate is in a sheet shape, and the pair of electrode plates are flatly attached to the front side and the back side of the PTC ceramic substrate.
  4. 4. A PTC heat-generating body according to claim 1, characterized in that: the PTC ceramic substrate is rod-shaped, axially extending grooves are formed in two opposite side walls of the PTC ceramic substrate, and the electrode plates are installed in the grooves in a matched mode.
  5. A PTC heating element, characterized in that: the heating element comprises an insulating base and a heating element body arranged on the insulating base, wherein the heating element body comprises a PTC ceramic substrate and a pair of electrode plates integrally solidified and formed in the PTC ceramic substrate, and one ends of the pair of electrode plates extend out of the PTC ceramic substrate to form lead connectors;
    the PTC ceramic substrate comprises the following components: a main crystal phase raw material, a semi-conducting additive, a Curie temperature shifting agent, a main additive, a sintering aid and a lead volatilization inhibitor; wherein:
    the main crystal phase is selected from BaCO3、TiO2、BaTiO3、V2O5One or more of BN;
    the semiconducting additive is selected from rare earth oxide, Y-Nb, Sb-Nb, Bi-Nb, Y (NO)3)3˙6H2One or more of O;
    the Curie temperature shifting agent is selected from PbO and Pb3O4、PbCO3Or PbTiO 3One or more of;
    the main additive is selected from Mn (NO)3)2Or MnO;
    the sintering aid is selected from SiO2、Al2O3、TiO2、Bi2O3、CaCO3、Sb2O3、BN、Li2CO3One or more of;
    MgO is used as lead volatilization inhibitor.
  6. 6. A PTC heat-generating body according to claim 5, characterized in that: and the pair of electrode plates are arranged in parallel and separated.
  7. 7. A PTC heat-generating body according to claim 6, characterized in that: the electrode plate is arranged close to the outer wall of the PTC ceramic substrate.
  8. The PTC heating element comprises an insulating base and a heating element body arranged on the insulating base, and is characterized in that: the heating body comprises a sheet PTC ceramic substrate and two layers of printed electrode plates printed on the front and back sides of the PTC ceramic substrate by adopting a slurry printing process;
    the PTC ceramic substrate comprises the following components: a main crystal phase raw material, a semi-conducting additive, a Curie temperature shifting agent, a main additive, a sintering aid and a lead volatilization inhibitor; wherein:
    the main crystal phase is selected from BaCO3、TiO2、BaTiO3、V2O5One or more of BN;
    the semiconducting additive is selected from rare earth oxide, Y-Nb, Sb-Nb, Bi-Nb, Y (NO)3)3˙6H2One or more of O;
    the Curie temperature shifting agent is selected from PbO and Pb3O4、PbCO3Or PbTiO3One or more of;
    the main additive is selected from Mn (NO)3)2Or MnO;
    the sintering aid is selected from SiO 2、Al2O3、TiO2、Bi2O3、CaCO3、Sb2O3、BN、Li2CO3One or more of;
    MgO is used as lead volatilization inhibitor.
  9. 9. A PTC heat-generating body according to claim 8, characterized in that: the electrode plate is made of Pt, Pd, Ag-Pd or Au.
  10. 10. A low temperature smoking set, its characterized in that: a PTC heat-generating body as defined in any one of claims 1 to 8.
CN201910292394.5A 2019-04-12 2019-04-12 PTC heating element and low-temperature smoking set Pending CN111838766A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112608146A (en) * 2020-12-31 2021-04-06 马鞍山巨华电子科技有限公司 Novel environment-friendly PTC thermistor with high-voltage resistance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112608146A (en) * 2020-12-31 2021-04-06 马鞍山巨华电子科技有限公司 Novel environment-friendly PTC thermistor with high-voltage resistance

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