CN110467441A - Porous ceramic substrate and preparation method thereof for atomizer - Google Patents
Porous ceramic substrate and preparation method thereof for atomizer Download PDFInfo
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- CN110467441A CN110467441A CN201910822245.5A CN201910822245A CN110467441A CN 110467441 A CN110467441 A CN 110467441A CN 201910822245 A CN201910822245 A CN 201910822245A CN 110467441 A CN110467441 A CN 110467441A
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Abstract
The porous ceramic substrate and preparation method thereof that this application provides a kind of for atomizer, wherein, the raw material for preparing of porous ceramic substrate for atomizer includes aggregate, pore creating material and binder, by weight percentage, pore creating material accounts for the 15~30% of aggregate, and binder accounts for the 5~30% of aggregate, and aggregate is ceramic material, pore creating material includes the first pore creating material to form hole and the second pore creating material for forming specific direction clear opening, and the content of the first pore creating material is more than second pore creating material.Pore creating material selects the first pore creating material to form hole and the second pore creating material for forming specific direction clear opening to arrange in pairs or groups, first pore creating material of high-content can produce more holes, higher porosity (30~70%) and aperture (1~200 μm) can thus be maintained, second pore creating material makes the hole to be formed with the clear opening of specific direction, thus it can make the mouthfeel of electronic cigarette more preferably, the original pure flavour of tobacco tar can more be restored, and various aspects of performance is all preferable, the comprehensive requirement met as atomizer of energy.
Description
Technical field
This application involves porous ceramics field more particularly to a kind of porous ceramic substrate for electronic smoke atomizer and
Preparation method.
Background technique
Porous ceramic film material has high temperature resistant as a kind of novel functional material, high pressure resistant, antiacid, alkali, organic
The features such as the advantages that corrosion of medium, long service life, reproducibility, thus be widely used in many fields.
The porous ceramic substrate that porous ceramic film material is constituted, according to use purpose and to the performance requirement of material it is different, had more
Kind preparation process can also be continuous perfect in terms of preparation process with the fast development of science and technology, to acquisition pores knot
The increasingly complex porous ceramic film material of structure.
Wherein, " substitute " of the electronic cigarette as traditional cigarette is just labeled with " smoking cessation ", " no danger from appearance on the market
The label of evil ".Currently, electronic cigarette industry developed for more than ten years, and China also becomes the maximum electronic cigarette producing country in the whole world
Family, yield account for about the 90% of the whole world, and the place of production is mainly distributed on Guangdong Province and Zhejiang Province.Electronic cigarette is mainly by holding the cigarette of tobacco tar
It manages (smoke grenade), vaporising device (atomizer) and battery three parts to constitute, atomizer, which is battery powered, to work, and adds using electricity
Tobacco tar in smoke pipe is flashed to vapor by heated filament heating system.The mouthfeel of electronic cigarette and the heater of atomizer and inside have
Closely connection, atomization core carry ceramics atomization heater, have stablize high temperature resistant, safety easily Oil Guide speciality, can bring
The advantage of finer and smoother mouthfeel and oil-leakage-prevention.The honeycomb hole design of ceramics, can enable tobacco tar sufficiently heat by aperture, make
The smog that must be atomized out is fine and smooth.Each drop tobacco tar is surrounded by annular, and 360 degree of heating are sufficiently volatilized, and aromatic hydrocarbon is complete in tobacco tar
Full release, brings fine and smooth mouthfeel, restores the original pure flavour of tobacco tar；Ceramic material itself is lipophilic strong, easily conduction tobacco tar,
When heating each time, ceramic body itself is impregnated thorough, sufficiently heating, it is ensured that every mouth is full smooth by tobacco tar.This means that
The performance in the hole of the ceramic substrate in atomizer plays an important role for the mouthfeel performance of electronic cigarette, but raising simply
Porosity often reduces the strength character of substrate, and influences its application.Thus, numerous electronic cigarette producers are in order to seize market
Share is constantly dedicated to the performance study of porous ceramic substrate in atomizer.
Apply for content
The purpose of the application is to provide a kind of porous ceramic substrate and preparation method thereof for atomizer, can shape
At the ceramic substrate of the hole with high porosity, large aperture, at the same can be formed with specific direction clear opening thus can be more
The good requirement for meeting atomizer.
To achieve the above object, the application first aspect provides a kind of porous ceramic substrate for atomizer, preparation
Raw material includes aggregate, pore creating material and binder, and by weight percentage, the pore creating material accounts for the 15~30% of the aggregate, institute
Binder accounts for the aggregate 5~30% are stated, the aggregate is ceramic material, and the pore creating material includes to form hole first
The content of pore creating material and the second pore creating material for forming specific direction clear opening, first pore creating material is more than second pore-creating
Agent.
The pore creating material of the porous ceramic substrate of the application select to be formed the first pore creating material of hole and formed specific direction it is straight
Second pore creating material of through-hole is arranged in pairs or groups, and the first pore creating material is primarily used to form hole, and the second pore creating material is mainly used for limiting hole
Direction when hole is formed, the first pore creating material of high-content can produce more holes, thus can maintain higher porosity
(30~70%) and aperture (1~200 μm), the second pore creating material make the hole to be formed with the clear opening of specific direction, can make
Porosity in particular directions be higher than other directions porosity, thus as electronic smoke atomizer in use, can be improved
Delivery rate of the tobacco tar in ceramic atomization core, enables tobacco tar more quickly to reach heater surface, guarantees filling for tobacco tar
Divide uniform atomizing, can avoid the release of aromatic hydrocarbon in the circulation and tobacco tar that influence smog because forming random hole, thus
It can make the mouthfeel of electronic cigarette more preferably, can more restore the original pure flavour of tobacco tar.Meanwhile then use account for the weight of aggregate for
15~30% pore creating material, 5~30% binder collocation may make manufactured porous ceramic substrate in hole with higher
While rate, flexural strength also with higher, up to 10~50MPa, this is because the introducing of fiber has and certain helps burning
Effect, and thermal coefficient is less than 2w/ (mk), roughness is less than 20 μm, thus the comprehensive use met as atomizer
It is required that.
The second aspect of the application provides a kind of production method of porous ceramic substrate for atomizer, including according to
Secondary following step:
1) stemness part, the aggregate and the pore creating material in the binder are carried out to dry-mixed, system of being sieved after mixing
Obtain powder mixture；
2) water is added or waterglass is tentatively mediated, the oiliness part added in the binder continues to mediate, directly
It is uniformly mixed to material, obtains wet mixture；
3) it is aging again to be repeatedly kneaded into mud section, vacuumizes into fine and close mud after mud section surface does not crack repeatedly
Section；
4) ceramic substrate green body is obtained through extrusion molding；
5) dry；
6) high temperature firing is carried out, through cooling porous ceramic substrate.
The wet mixing again after dry-mixed, can make to do in the production method of the porous ceramic substrate for atomizer of the application
Property component and stemness component between be uniformly mixed, the oiliness part being then converted in hygrometric state and binder carry out hygrometric state group point it
Between be uniformly mixed, be kneaded into mud section so as to mix each component uniformly, can avoid stemness component and hygrometric state group
Divide agglomeration when directly mixing agglomerating, thus pore creating material can be made to be uniformly distributed and form orderly, even aperture distribution through-hole；
Ceramic substrate High anti bending strength obtained can be made by being repeatedly kneaded into fine and close mud section；During extrusion molding, the cause that is relatively large in diameter
For close mud section during mold lesser by size, the second pore creating material in pug can be fixed along the smallest direction of stress
Orientation of second pore creating material in green body can be maintained to sequence, thus by extrusion molding, it is available after high temperature is fired
The porous ceramic substrate of clear opening with specific direction.
Detailed description of the invention
Fig. 1 includes the shape appearance figure for the porous ceramic substrate that Fig. 1 a, Fig. 1 b and Fig. 1 c, Fig. 1 a are embodiment 1, and Fig. 1 b is figure
1a schemes in 300 times of partial enlargement of SEM of horizontal direction, and Fig. 1 c is Fig. 1 a in 300 times of partial enlargement of SEM of vertical direction
Figure.
Fig. 2 is that the porous ceramic substrate of comparative example 1 and the SEM of 300 times of the equidirectional partial enlargement of Fig. 1 c scheme.
Fig. 3 a is that the porous ceramic substrate of embodiment 6 and the SEM of 500 times of the equidirectional partial enlargement of Fig. 1 c scheme,
Fig. 3 b is that Fig. 1 a schemes in 500 times of partial enlargement of SEM of vertical direction.
Specific embodiment
The porous ceramic substrate for atomizer of the application, preparing raw material includes aggregate, pore creating material and binder, with
Weight percent meter, pore creating material account for the 15~30% of aggregate, and binder accounts for the 5~30% of aggregate, and aggregate is ceramic material, make
Hole agent includes the first pore creating material to form hole and the second pore creating material for forming specific direction clear opening, and the first pore creating material contains
Amount is more than the second pore creating material.Wherein, by weight percentage, pore creating material can specifically account for aggregate 15%, 18%, 20%,
22%, 25%, 28%, 30%, binder can specifically account for 5%, 10%, 15%, 20%, 25%, the 30% of aggregate.
Preferably, ceramic material is selected from least one of aluminium oxide, silica, zirconium oxide and silicon carbide.More preferably
, ceramic material is the mixture of aluminium oxide and silica, and by weight percentage, in ceramic material aluminium oxide be 30~
80%, silica is 20~70%, and ceramic material is the mixture of aluminium oxide and silica, introduces binder on this basis
And pore creating material, by using extrusion molding mode, the firing temperature that can greatly reduce porous ceramics is (single due to single raw material
The sintering temperature of monoxide is higher, and two kinds of raw materials are compound, i.e. two oxides phase, easily forms liquid phase at high temperature, promotes sample
The sintering of product), prepare the porous ceramic substrate of even aperture distribution.
Preferably, the first pore creating material is selected from least one of natural organic matter, carbon dust, polymer microsphere and stalk.More
Preferably, the first pore creating material in starch, carbon dust, poly (methyl methacrylate) micro-sphere, polystyrene microsphere and stalk extremely
Few one kind, wherein the pore-creating effect with starch is best, this is because the uniform particle sizes of starch, and there is certain plasticity, compare
It is suitble to the preparation of pug.
Preferably, the second pore creating material is organic fiber or carbon fiber, and second pore creating material of fiber-like itself has orientation
Property, thus can control its locality in green body in conjunction with extrusion molding, it can obtain that there is specific direction after fired
Through-hole.The introducing of fiber have it is certain help burning effect, the intensity of substrate, and more preferably carbon fiber can be improved, can be more effective
Improve the intensity of ceramic substrate.
Preferably, organic fiber is at least one of terylene, acrylic fibers, polyamide fibre, polypropylene fibre and aramid fiber.
Preferably, binder includes dry bonding agent and oiliness binder, dry bonding agent be selected from polyvinyl alcohol and/or
Carboxymethyl cellulose, oiliness binder are selected from least one of glycerol, tung oil, silicone oil and ethylene glycol.Polyvinyl alcohol, carboxylic first
Base cellulose, glycerol, tung oil, silicone oil and ethylene glycol can be used as binder use, may also participate in pore-creating reaction and pass through
Ceramic substrate can be made to form more holes after firing.Not only it had used dry bonding agent but also had used oiliness binder, may make each
Component can be all uniformly mixed in dry-mixed and kneading.
The production method of the porous ceramic substrate for atomizer of the application, including following step successively:
1) stemness part, aggregate and the pore creating material in binder are carried out to dry-mixed, obtained dry powder blend of being sieved after mixing
Object；
2) water is added or waterglass is tentatively mediated, the oiliness part added in binder continues to mediate, until object
Material is uniformly mixed, and obtains wet mixture；
3) it is aging again to be repeatedly kneaded into mud section, vacuumizes into fine and close mud after mud section surface does not crack repeatedly
Section；
4) ceramic substrate green body is obtained through extrusion molding；
5) dry；
6) high temperature firing is carried out, through cooling porous ceramic substrate.
Preferably, carried out in batch mixer it is dry-mixed, and twice adjust mixing direction, and time interval be 20min, sieving
40 mesh sieve of Shi Caiyong.
Preferably, the aqueous solution that the waterglass that addition concentration is 5% when kneading, the i.e. concentration of sodium metasilicate are 5%, no
Water source can be only provided and convert hygrometric state for stemness component, can function as the effect of binder.
Preferably, the extrusion pressure of extrusion molding is 0.1~5MPa.
Preferably, it can first spontaneously dry when dry and be dried in air dry oven in 80 DEG C.
Preferably, described fire uses substep temperature-raising method, and the time fired is 12~20h, and highest firing temperature is
1150~1350 DEG C.Substep temperature-raising method can be used when firing to be sintered, heating rate first increases to be lifted to a 1000 DEG C left sides
Heating rate is reduced when right again and is warming up to 1150~1350 DEG C, and is first when every step heating 0.5~1.5h of lower heat preservation, cooling
It is cooled to after 1000 DEG C or so with the rate of 2.5 DEG C/min and carries out natural cooling again.
The technical solution of the application is further illustrated below by specific embodiment, involved by embodiments herein
Raw material can pass through it is commercially available obtain.
Embodiment 1
A kind of porous ceramic substrate, preparing raw material includes aggregate, pore creating material and binder, and aggregate is that weight ratio is 1:1's
Aluminium oxide and silica, pore creating material are that account for the weight of aggregate be respectively 20% starch and 0.5% carbon fiber, and binder is
The weight for accounting for aggregate is respectively 10% carboxymethyl cellulose and 15% glycerol.
Its production method includes following step successively:
1) aluminium oxide, silica, starch, carbon fiber and carboxymethyl cellulose are entered dry-mixed in batch mixer, adjustment is mixed twice
Expect direction, time interval 20min crosses the powder mixture that 40 mesh sieve are made uniformly mixed after mixing；
2) by obtained powder mixture and account for the waterglass (its concentration is 5%) that the weight of aggregate is 40% be placed in it is mixed
It is tentatively mediated in material machine, then outer glycerol adding continues to mediate, until material is uniformly mixed, obtains wet mixture；
3) it is aging again that obtained wet mixture is repeatedly kneaded into mud section in vacuum deairing machine, repeatedly directly
Vacuumized after not cracking to mud section surface, vacuum degree under 95% pugging three times at required fine and close mud section；
4) gained densification mud section is placed in extruder, adjusts extrusion pressure 0.5MPa, obtain required ceramic base through squeezing out
Slab body；
5) ceramic substrate green body is spontaneously dried, is subsequently placed in 80 DEG C of drying in air dry oven；
6) it is placed in high temperature furnace, 350 DEG C is warming up to the rate of 1 DEG C/min, 500 DEG C of guarantors is risen to the rate of 1.5 DEG C/min
Warm 1h, continues 1000 DEG C of heating with 2.5 DEG C/min, reduces heating rate, rises to 1200 DEG C of heat preservation 1h with 2 DEG C/min, then with
Natural cooling obtains porous ceramic substrate after the rate of 2.5 DEG C/min is cooled to 1000 DEG C.
Obtained porous ceramic substrate is subjected to SEM observation, as shown in Fig. 1 a, Fig. 1 b and Fig. 1 c, obtains more having
Sequence and the through-hole of direction straight up, porous ceramic substrate porosity be 58%, aperture size is 16 μm, and flexural strength is
16MPa, thermal coefficient are 1.18w/ (mk), and roughness is 18 μm.
Embodiment 2
A kind of porous ceramic substrate, preparing raw material includes aggregate, pore creating material and binder, and aggregate is silicon carbide, pore creating material
It is respectively 20% starch and 0.5% carbon fiber to account for the weight of aggregate, binder is that account for the weight of aggregate be respectively 10%
Carboxymethyl cellulose and 15% glycerol.
Its production method includes following step successively:
1) silicon carbide, starch, carbon fiber and carboxymethyl cellulose are entered it is dry-mixed in batch mixer, twice adjust mixing direction,
Time interval is 20min, and the powder mixture that 40 mesh sieve are made uniformly mixed is crossed after mixing；
2) by obtained powder mixture and account for the waterglass (its concentration is 5%) that the weight of aggregate is 40% be placed in it is mixed
It is tentatively mediated in material machine, then outer glycerol adding continues to mediate, until material is uniformly mixed, obtains wet mixture；
3) it is aging again that obtained wet mixture is repeatedly kneaded into mud section in vacuum deairing machine, repeatedly directly
Vacuumized after not cracking to mud section surface, vacuum degree under 95% pugging three times at required fine and close mud section；
4) gained densification mud section is placed in extruder, adjusts extrusion pressure 0.5MPa, obtain required ceramic base through squeezing out
Slab body；
5) ceramic substrate green body is spontaneously dried, is subsequently placed in 80 DEG C of drying in air dry oven；
6) it is placed in high temperature furnace, 350 DEG C is warming up to the rate of 1 DEG C/min, 500 DEG C of guarantors is risen to the rate of 1.5 DEG C/min
Warm 1h, continues 1000 DEG C of heating with 2.5 DEG C/min, reduces heating rate, rises to 1400 DEG C of heat preservation 1h with 2 DEG C/min, then with
Natural cooling obtains porous ceramic substrate after the rate of 2.5 DEG C/min is cooled to 1000 DEG C.
Obtained porous ceramic substrate is subjected to performance detection, porous ceramic substrate porosity is 52%, and aperture size is
30 μm, flexural strength 15MPa, thermal coefficient is 1.03w/ (mk), and roughness is 15 μm.
Embodiment 3
A kind of porous ceramic substrate, preparing raw material includes aggregate, pore creating material and binder, and aggregate is that weight ratio is 1:1's
Aluminium oxide and silica, pore creating material are that account for the weight of aggregate be respectively 20% starch and 0.5% polyamide fibre, and binder is to account for
The weight of aggregate is respectively 10% carboxymethyl cellulose and 15% glycerol.
Its production method includes following step successively:
1) aluminium oxide, silica, starch, polyamide fibre and carboxymethyl cellulose are entered dry-mixed in batch mixer, adjusts mixing twice
Direction, time interval 20min cross the powder mixture that 40 mesh sieve are made uniformly mixed after mixing；
2) by obtained powder mixture and account for the waterglass (its concentration is 5%) that the weight of aggregate is 40% be placed in it is mixed
It is tentatively mediated in material machine, then outer glycerol adding continues to mediate, until material is uniformly mixed, obtains wet mixture；
3) it is aging again that obtained wet mixture is repeatedly kneaded into mud section in vacuum deairing machine, repeatedly directly
Vacuumized after not cracking to mud section surface, vacuum degree under 95% pugging three times at required fine and close mud section；
4) gained densification mud section is placed in extruder, adjusts extrusion pressure 0.5MPa, obtain required ceramic base through squeezing out
Slab body；
5) ceramic substrate green body is spontaneously dried, is subsequently placed in 80 DEG C of drying in air dry oven；
6) it is placed in high temperature furnace, 350 DEG C is warming up to the rate of 1 DEG C/min, 500 DEG C of guarantors is risen to the rate of 1.5 DEG C/min
Warm 1h, continues 1000 DEG C of heating with 2.5 DEG C/min, reduces heating rate, rises to 1200 DEG C of heat preservation 1h with 2 DEG C/min, then with
Natural cooling obtains porous ceramic substrate after the rate of 2.5 DEG C/min is cooled to 1000 DEG C.
Obtained porous ceramic substrate is subjected to performance detection, porous ceramic substrate porosity is 63%, and aperture size is
14 μm, flexural strength 13MPa, thermal coefficient is 0.99w/ (mk), and roughness is 12 μm.
Embodiment 4
A kind of porous ceramic substrate, preparing raw material includes aggregate, pore creating material and binder, and aggregate is that weight ratio is 1:1's
Aluminium oxide and silica, pore creating material are that account for the weight of aggregate be respectively 20% starch and 0.5% carbon fiber, and binder is
The weight for accounting for aggregate is respectively 10% carboxymethyl cellulose and 15% glycerol.
Its production method includes following step successively:
1) aluminium oxide, silica, starch, carbon fiber and carboxymethyl cellulose are entered dry-mixed in batch mixer, adjustment is mixed twice
Expect direction, time interval 20min crosses the powder mixture that 40 mesh sieve are made uniformly mixed after mixing；
2) water that obtained powder mixture and the weight for accounting for aggregate are 40% is placed in batch mixer and is tentatively mediated, then
Outer glycerol adding continues to mediate, until material is uniformly mixed, obtains wet mixture；
3) it is aging again that obtained wet mixture is repeatedly kneaded into mud section in vacuum deairing machine, repeatedly directly
Vacuumized after not cracking to mud section surface, vacuum degree under 95% pugging three times at required fine and close mud section；
4) gained densification mud section is placed in extruder, adjusts extrusion pressure 0.5MPa, obtain required ceramic base through squeezing out
Slab body；
5) ceramic substrate green body is spontaneously dried, is subsequently placed in 80 DEG C of drying in air dry oven；
6) it is placed in high temperature furnace, 350 DEG C is warming up to the rate of 1 DEG C/min, 500 DEG C of guarantors is risen to the rate of 1.5 DEG C/min
Warm 1h, continues 1000 DEG C of heating with 2.5 DEG C/min, reduces heating rate, rises to 1200 DEG C of heat preservation 1h with 2 DEG C/min, then with
Natural cooling obtains porous ceramic substrate after the rate of 2.5 DEG C/min is cooled to 1000 DEG C.
Obtained porous ceramic substrate is subjected to performance detection, porous ceramic substrate porosity is 60%, and aperture size is
23 μm, flexural strength 13MPa, thermal coefficient is 1.03w/ (mk), and roughness is 12 μm.
Embodiment 5
A kind of porous ceramic substrate, preparing raw material includes aggregate, pore creating material and binder, and aggregate is that weight ratio is 3:2's
Aluminium oxide and silica, pore creating material be account for aggregate weight be respectively 25% poly (methyl methacrylate) micro-sphere and 2.5%
Carbon fiber, binder are that account for the weight of aggregate be respectively 15% polyvinyl alcohol and 15% ethylene glycol.
Its production method includes following step successively:
1) aluminium oxide, silica, poly (methyl methacrylate) micro-sphere, carbon fiber and polyvinyl alcohol are entered in batch mixer and is done
It is mixed, mixing direction is adjusted twice, and time interval 20min crosses the powder mixture that 40 mesh sieve are made uniformly mixed after mixing；
2) by obtained powder mixture and account for the waterglass (its concentration is 5%) that the weight of aggregate is 40% be placed in it is mixed
It is tentatively mediated in material machine, then additional ethylene glycol continues to mediate, until material is uniformly mixed, obtains wet mixture；
3) it is aging again that obtained wet mixture is repeatedly kneaded into mud section in vacuum deairing machine, repeatedly directly
Vacuumized after not cracking to mud section surface, vacuum degree under 95% pugging three times at required fine and close mud section；
4) gained densification mud section is placed in extruder, adjusts extrusion pressure 1.5MPa, obtain required ceramic base through squeezing out
Slab body；
5) ceramic substrate green body is spontaneously dried, is subsequently placed in 85 DEG C of drying in air dry oven；
6) it is placed in high temperature furnace, 350 DEG C is warming up to the rate of 1 DEG C/min, 500 DEG C of guarantors is risen to the rate of 1.5 DEG C/min
Warm 1h, continues 1000 DEG C of heating with 2.5 DEG C/min, reduces heating rate, rises to 1250 DEG C of heat preservation 1h with 2 DEG C/min, then with
Natural cooling obtains porous ceramic substrate after the rate of 2.5 DEG C/min is cooled to 1000 DEG C.
Obtained porous ceramic substrate is subjected to performance detection, porous ceramic substrate porosity is 59%, and aperture size is
16 μm, flexural strength 16MPa, thermal coefficient is 1.23w/ (mk), and roughness is 10.6 μm.
Comparative example 1
A kind of porous ceramic substrate, preparing raw material includes aggregate, pore creating material and binder, and aggregate is that weight ratio is 1:1's
Aluminium oxide and silica, pore creating material be account for aggregate weight be respectively 20.5% starch, binder is the weight point for accounting for aggregate
It Wei not 10% carboxymethyl cellulose and 15% glycerol.
Its production method includes following step successively:
1) aluminium oxide, silica, starch and carboxymethyl cellulose are entered it is dry-mixed in batch mixer, twice adjust mixing direction,
Time interval is 20min, and the powder mixture that 40 mesh sieve are made uniformly mixed is crossed after mixing；
2) by obtained powder mixture and account for the waterglass (its concentration is 5%) that the weight of aggregate is 40% be placed in it is mixed
It is tentatively mediated in material machine, then outer glycerol adding continues to mediate, until material is uniformly mixed, obtains wet mixture；
3) it is aging again that obtained wet mixture is repeatedly kneaded into mud section in vacuum deairing machine, repeatedly directly
Vacuumized after not cracking to mud section surface, vacuum degree under 95% pugging three times at required fine and close mud section；
4) gained densification mud section is placed in extruder, adjusts extrusion pressure 0.5MPa, obtain required ceramic base through squeezing out
Slab body；
5) ceramic substrate green body is spontaneously dried, is subsequently placed in 80 DEG C of drying in air dry oven；
6) it is placed in high temperature furnace, 350 DEG C is warming up to the rate of 1 DEG C/min, 500 DEG C of guarantors is risen to the rate of 1.5 DEG C/min
Warm 1h, continues 1000 DEG C of heating with 2.5 DEG C/min, reduces heating rate, rises to 1200 DEG C of heat preservation 1h with 2 DEG C/min, then with
Natural cooling obtains porous ceramic substrate after the rate of 2.5 DEG C/min is cooled to 1000 DEG C.
Obtained porous ceramic substrate is subjected to SEM observation, as shown in Fig. 2, its there is only it is minimal amount of straight up
Obtained porous ceramic substrate is carried out performance detection by through-hole, and porous ceramic substrate porosity is 64%, and aperture size is 10 μ
M, flexural strength 7.5MPa, thermal coefficient are 1.06w/ (mk), and roughness is 10 μm.
According to the comparison of Examples 1 to 5 and comparative example 1 it is found that the application selects to form the first pore creating material and shape of hole
It arranges in pairs or groups at the second pore creating material of specific direction clear opening, not only available higher porosity and aperture, more important
Be the through-hole that can obtain having specific direction, porosity in particular directions can be made to be higher than the porosity in other directions, and
And the porous substrate of the application is while porosity with higher, it is flexural strength also with higher, lower thermally conductive
Coefficient, and roughness is small, thus the comprehensive requirement met as atomizer.
Comparative example 1 and embodiment 2 are burnt it is found that using the double oxide of aluminium oxide and silica as ceramic material
Temperature processed can reduce.Comparative example 1 and embodiment 3 are it is found that using carbon fiber as the second pore creating material, and flexural strength is more
It is good.Comparative example 1 and embodiment 4 it is found that mediate when using waterglass than the porous ceramic substrate that water obtains intensity more
It is good.
Supplementary explanation, the porosity of embodiments herein and comparative example, aperture, flexural strength, thermal coefficient and
Roughness all passes through measuring instrument and is tested.In addition, being obtained to fully demonstrate in the application production method using extrusion molding
To the clear opening with specific direction, embodiment 6 (dry pressing) is set and is maked a comparison description with embodiment 1 (extrusion forming).
Embodiment 6
A kind of porous ceramic substrate, preparing raw material includes aggregate, pore creating material and binder, and aggregate is that weight ratio is 1:1's
Aluminium oxide and silica, pore creating material are that account for the weight of aggregate be respectively 20% starch and 0.5% carbon fiber, and binder is
Account for the carboxymethyl cellulose that the weight of aggregate is 10%.
Its production method includes following step successively:
1) aluminium oxide, silica, starch, carbon fiber and carboxymethyl cellulose are entered dry-mixed in batch mixer, adjustment is mixed twice
Expect direction, time interval 20min crosses the powder mixture that 40 mesh sieve are made uniformly mixed after mixing；
2) by obtained powder mixture and account for the waterglass (its concentration is 5%) that the weight of aggregate is 10% be placed in it is wet
It is uniformly mixed in mill, obtains wet mixture；
3) obtained wet mixture drying and screening is obtained into pelletizing；
4) gained pelletizing is placed in dry-pressing formed machine and is pressed into ceramic substrate green body；
5) ceramic substrate green body is spontaneously dried, is subsequently placed in 80 DEG C of drying in air dry oven；
6) it is placed in high temperature furnace, 350 DEG C is warming up to the rate of 1 DEG C/min, 500 DEG C of guarantors is risen to the rate of 1.5 DEG C/min
Warm 1h, continues 1000 DEG C of heating with 2.5 DEG C/min, reduces heating rate, rises to 1200 DEG C of heat preservation 1h with 2 DEG C/min, then with
Natural cooling obtains porous ceramic substrate after the rate of 2.5 DEG C/min is cooled to 1000 DEG C.
Obtained porous ceramic substrate is subjected to SEM observation, as shown in Figure 3a, there is only it is a small amount of straight up
Through-hole, porous ceramic substrate porosity are 55%, and aperture size is 12 μm, flexural strength 23MPa, and thermal coefficient is
1.23w/ (mk), roughness are 12 μm.
It is compared by Fig. 3 b of embodiment 1 and Fig. 3 a of embodiment 6 it is found that due to that can be made directly by extrusion forming
For the biggish fine and close mud section of diameter during mold lesser by size, the second pore creating material in pug can be along stress most
Small direction orients sequence, thus can maintain orientation of second pore creating material in green body, can be had after high temperature firing
There is the porous ceramic substrate of the clear opening of specific direction.And other molding modes (such as dry-pressing of embodiment 6) are used, it is just difficult
With the orientation for maintaining the second pore creating material itself to have, thus it is difficult to control the direction of its through-hole.
It should be pointed out that embodiments above is merely to illustrate the application rather than limitation scope of the present application, readding
After having read the application, those skilled in the art to the ceramic material of the application, pore creating material, binder, production method items
The modification of the various equivalent forms such as parameter each falls within the application range defined in the appended claims.
Claims (10)
1. a kind of porous ceramic substrate for atomizer, which is characterized in that preparing raw material includes aggregate, pore creating material and bonding
Agent, by weight percentage, the pore creating material account for the 15~30% of the aggregate, the binder account for the aggregate 5~
30%, the aggregate is ceramic material, and the pore creating material includes forming the first pore creating material of hole and forming specific direction to lead directly to
The content of second pore creating material in hole, first pore creating material is more than second pore creating material.
2. the porous ceramic substrate according to claim 1 for atomizer, which is characterized in that the ceramic material is selected from
At least one of aluminium oxide, silica, zirconium oxide and silicon carbide.
3. the porous ceramic substrate according to claim 2 for atomizer, which is characterized in that the ceramic material is oxygen
Change the mixture of aluminium and silica, and by weight percentage, aluminium oxide described in the ceramic material is 30~80%, described
Silica is 20~70%.
4. the porous ceramic substrate according to claim 1 for atomizer, which is characterized in that the first pore creating material choosing
From at least one of natural organic matter, carbon dust, polymer microsphere and stalk.
5. the porous ceramic substrate according to claim 4 for atomizer, which is characterized in that the first pore creating material choosing
From at least one of starch, carbon dust, poly (methyl methacrylate) micro-sphere, polystyrene microsphere and stalk.
6. the porous ceramic substrate according to claim 1 for atomizer, which is characterized in that second pore creating material is
Organic fiber or carbon fiber.
7. the porous ceramic substrate according to claim 6 for atomizer, which is characterized in that the organic fiber is to wash
At least one of synthetic fibre, acrylic fibers, polyamide fibre, polypropylene fibre and aramid fiber.
8. the porous ceramic substrate according to claim 1 for atomizer, which is characterized in that the binder includes dry
Property binder and oiliness binder, the dry bonding agent is selected from polyvinyl alcohol and/or carboxymethyl cellulose, the oiliness bonding
Agent is selected from least one of glycerol, tung oil, silicone oil and ethylene glycol.
9. the production method of any porous ceramic substrate for atomizer, feature exist according to claim 1~8
In including following step successively:
1) stemness part, the aggregate and the pore creating material in the binder are carried out to dry-mixed, obtained do of being sieved after mixing
Powder mixture；
2) water is added or waterglass is tentatively mediated, the oiliness part added in the binder continues to mediate, until object
Material is uniformly mixed, and obtains wet mixture；
3) it is aging again to be repeatedly kneaded into mud section, vacuumizes into fine and close mud section after mud section surface does not crack repeatedly；
4) ceramic substrate green body is obtained through extrusion molding；
5) dry；
6) high temperature firing is carried out, through cooling porous ceramic substrate.
10. the production method of the porous ceramic substrate according to claim 9 for atomizer, which is characterized in that described
The extrusion pressure of extrusion molding is 0.1~5MPa, and described fire uses substep temperature-raising method, and the time fired is 12~20h, most
High firing temperature is 1150~1350 DEG C.
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