CN110041056B - Alumina ceramic heating tube and preparation method thereof - Google Patents
Alumina ceramic heating tube and preparation method thereof Download PDFInfo
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Abstract
The aluminum oxide ceramic heating tube comprises an aluminum oxide ceramic tube, a silica gel layer, an electric heating tungsten wire or a nickel wire and silver wires, wherein the silica gel layer is arranged on the outer surface of the aluminum oxide ceramic tube, the electric heating tungsten wire or the nickel wire is arranged between the silica gel layer and the aluminum oxide ceramic tube, the silver wires are arranged at two ends of the electric heating tungsten wire or the nickel wire, the thickness of the aluminum oxide ceramic tube is 0.3-0.5 mm, and the density of the aluminum oxide ceramic tube is not less than 3.9g/cm3The resistance is 0.5-2 omega, the thickness of the silica gel layer is 1-2 mm, the silica gel layer can resist the temperature of 300-400 ℃, the thickness of the electric heating tungsten wire or the nickel wire is 0.03-0.05 mm, and the diameter of the silver wire is 0.1-0.2 mm. The ultrathin alumina ceramic tube prepared by the ceramic extrusion molding process can be quickly and uniformly heated, has a large heating surface, small power consumption, long service life and good heat preservation performance, and has wide market prospect.
Description
Technical Field
The invention belongs to the field of alumina ceramic heating bodies, and particularly relates to an alumina ceramic heating tube and a preparation method thereof.
Background
Currently, the heating elements of the flue-cured tobacco type electronic cigarettes in the market mainly comprise common alumina ceramic heating elements, such as patents CN 208369873U, CN 208274083U, CN 207968984U and CN 204498395U, and zirconia ceramic heating elements, such as patent CN 108966382 a. The two ceramic heating elements are exposed with some defects in the using process, for example, in patents CN 207968984U and CN104446507, the alumina ceramic heating element adopts a pipe coiling process to coil an inner layer alumina green casting sheet and an outer layer alumina green casting sheet into a ceramic pipe, and a tungsten wire is printed between the inner layer ceramic green sheet and the outer layer ceramic green sheet, and finally, the alumina ceramic heating element is manufactured by co-firing, and the ceramic heating element has the defects that (1) a joint seam exists in the middle of the ceramic pipe, which is not beautiful; (2) peculiar smell can be generated in the use process of the ceramic heating element; (3) the ceramic heating element has too fast heat dissipation and large power consumption. And the polyhedral heating type ceramic heating element as described in patent CN 208274083U has the defect that the cross-shaped ceramic component is not easy to prepare. In addition, the zirconia ceramic heating element in patent CN 108966382 a adopts a sheet structure, a tungsten wire is directly printed on the surface of a zirconia green sheet, and then the tungsten wire is co-fired to obtain a zirconia heating element, wherein the sheet structure heating element has (1) a too small heating surface, which causes insufficient tobacco shred and flue-cured tobacco; (2) the zirconia ceramics have poor thermal conductivity and large thermal expansion coefficient and are easy to break off in the using process; (3) the heat insulation film of the electric heating tungsten wire is easy to fall off, so that the tungsten wire is easy to oxidize. Therefore, it is a general requirement of the tobacco-curing type electronic cigarette industry to find a ceramic heating element which can rapidly and uniformly heat up, and has the advantages of beautiful appearance, high strength, high thermal conductivity, large heating surface, low power consumption and long service life. The high-purity aluminum oxide ceramic has the advantages of good electrical insulation, high strength, good thermal conductivity, light transmission, easy sintering and the like, and can be widely applied to the fields of ceramic lamps, such as patents CN 102659415A and CN 200910044200.6, and LED heat dissipation, such as patent CN 108610026A, CN 102777809A and the like. The electronic cigarette heating element is manufactured by adopting the high-purity alumina ceramic tube with an ultrathin structure (the wall thickness is 0.3-0.5 mm) (the thermal resistance is small), good electrical insulation, high strength (>400MPa), good thermal conductivity and light transmittance (attractive appearance), and is a better technical scheme.
At present, the cold isostatic pressing technology is widely used in industry to produce high-purity alumina ceramic tubes. When the technology is adopted to manufacture the ultrathin (the wall thickness is 0.3-0.5 mm) alumina tube, ceramic particles for pressing are difficult to be uniformly distributed in a gap between the rubber die and the WC center post, and the ceramic tube has the problem of uneven thickness after being formed. Therefore, the invention has the difficulty that a new forming technology is sought to produce ultrathin (the wall thickness is 0.3-0.5 mm) high-density high-purity alumina ceramic tubes in batch. The preparation of transparent alumina ceramics generally requires the addition of small amounts of additives. MgO, ZrO used as described in patents CN 105541302A and CN 86101452A2、Y2O3、La2O3The doped ions are dissolved in the main crystal phase in a solid mode to generate lattice distortion, the crystal boundary migration rate of the main crystal phase at high temperature is inhibited, and the discharge of inter-crystal pores is promoted, but the alumina ceramics prepared by the doped formulas have higher firing temperature (1780-1820 ℃), and the service life of the refractory material of the kiln is seriously shortened.
Disclosure of Invention
The invention aims to provide an alumina ceramic heating tube which has the advantages of rapid and uniform temperature rise, high strength, high thermal conductivity, large heating surface, low power consumption and long service life, and a preparation method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: an alumina ceramic heating tube is characterized in that: the electric heating tungsten wire or the nickel wire is arranged between the silica gel layer and the alumina ceramic tube, and the silver wires are arranged at two ends of the electric heating tungsten wire.
The thickness of the alumina ceramic tube is 0.3-0.5 mm, and the density is not less than 3.9g/cm3The resistance of the tungsten wire or the nickel wire is 0.5-2 omega.
The thickness of silica gel layer is 1 ~ 2mm, temperature resistant 300 ~ 400 ℃.
The thickness of the electrothermal tungsten wire or the nickel wire is 0.03-0.05 mm, and the diameter of the silver wire is 0.1-0.2 mm.
The preparation method of the alumina ceramic heating tube is characterized by comprising the following steps:
the preparation method comprises the following steps: adding 0.01-0.05 part of MgO introducing agent, 0.01-0.05 part of CaO introducing agent and 0.05-0.1 part of Al into 100 parts of nano alumina powder according to weight percentage2O3Introducing agent and 0.01-0.05 part of SiO2Introducing an introducing agent, 1.5-2.5 parts of oleic acid, 1-2 parts of a lubricating agent, 3-15 parts of a binder and 10-30 parts of deionized water into a mixer, and mixing at the temperature of below 30 ℃ for 1-5 hours to prepare alumina ceramic tube pug with uniform dispersion and 75-85% of solid content;
step (2) forming an aluminum dioxide ceramic tube: adding the pug prepared in the step one into a screw type ceramic extrusion forming machine with a vacuum defoaming device, and extruding the ceramic pug into a hollow and thin-wall ceramic blank pipe through a die head under the pushing of a screw;
drying the alumina ceramic blank tube: transferring the ceramic blank pipe prepared in the step two to a rolling dryer, and drying and dehydrating for 5-10 minutes under the condition of hot air at 40-50 ℃ to obtain the ceramic blank pipe with the roundness and the straightness meeting the requirements;
step four, glue discharging of the aluminum oxide ceramic green tube: biscuit firing the ceramic green tube prepared in the third step at 1100-1200 ℃ to obtain a ceramic biscuit firing tube;
firing the aluminum oxide ceramic: placing the ceramic biscuit firing tube obtained in the step four in a high-temperature molybdenum tube, and firing at 1500-1600 ℃ in a hydrogen atmosphere to obtain an alumina ceramic tube;
preparing an electrothermal tungsten wire or a nickel wire on the surface of the alumina ceramic tube: printing a thick-film electric heating tungsten wire or a nickel wire on the outer surface of the alumina ceramic tube prepared in the fifth step by adopting a screen printing technology, and then transferring the thick-film electric heating tungsten wire or the nickel wire into a normal-pressure hydrogen furnace to be sintered at 1000-1500 ℃ to obtain an electric heating tungsten wire or nickel wire co-fired alumina ceramic heating tube;
preparing a silica gel layer on the surface of the aluminum oxide ceramic tube: and welding two ends of the electric heating tungsten wire or the nickel wire of the ceramic heating tube prepared in the sixth step with a silver wire welding technology into a whole respectively, then pouring a silica gel layer on the outer surface of the ceramic heating tube, and obtaining a finished product after the silica gel layer is solidified.
The purity of the nano alumina powder used in the step one is more than or equal to 99.99%, the particle size is 300-500 nm, and the specific surface area is 6-10 m2/g。
In the step one, the MgO introducing agent is Mg (NO)3)2 6H2The introducing agent of O and CaO is CaCl2 2H2O， Al2O3The introducing agent is Al (NO)3)3 9H2O， SiO2The introducing agent is Si (OC)2H5)4。
In the first step, the adhesive is one of high-purity ethyl cellulose ether, polyvinyl alcohol, hydroxypropyl methyl cellulose ether and hydroxypropyl ethyl cellulose ether powder, and the lubricant is one of glycerol, ethylene glycol, polyethylene glycol 600 and polyethylene glycol 1000.
The structure of the rolling dryer in the third step is composed of a rack, a fan heater, a motor, a belt, a hot air pipe, a pipe frame and stainless steel pipes, wherein the motor is arranged at the bottom of the rack, the pipe frame is arranged at the top of the rack, more than 2 stainless steel pipes are arranged on the pipe frame, and the belt is arranged between the stainless steel pipes and the motor; and an air inlet at one end of the hot air pipe is connected with the warm air blower, and an air outlet at the other end of the hot air pipe is arranged at the top of the stainless steel pipe.
The diameter of the stainless steel pipe is 10-20 mm, the length of the stainless steel pipe is 500-600 mm, the distance between the stainless steel pipes is 1-2 mm, and the rotating speed of the stainless steel pipe is 3-10 revolutions per minute.
In the invention, MgO, CaO and Al are adopted to meet the new condition that the requirement of the ultra-thin alumina tube on the light transmittance is not high2O3、SiO2A quaternary new doping formula which can form small and micro CaO-Al on the surface of alumina particles2O3-SiO2The glass phase can obviously reduce the sintering temperature (1500-1600 ℃) of the alumina ceramic and inhibit the growth of alumina grains; in addition, the invention also discloses a technical innovation point of pouring a high-temperature resistant silica gel layer on the electric heating tungsten wire or the nickel wire on the outer surface of the ultrathin alumina ceramic tube. The silica gel layer can isolate the tungsten wire which is easy to oxidize from the air, and can effectively reduce the power consumption of the ceramic heating element during working due to the excellent heat insulation performance of the silica gel layer which has extremely low heat conductivity.
The invention prepares the ultrathin alumina ceramic tube by the ceramic extrusion molding process, then forms the electric heating tungsten wire on the outer surface of the ceramic by co-firing, and finally forms the thicker silica gel layer on the surface of the electric heating tungsten wire or the nickel wire by pouring, thereby obviously improving the heat conduction performance of the working surface of the ceramic heating element and effectively reducing the heat loss phenomenon on the outer surface, thereby obtaining the alumina ceramic heating tube which can quickly and uniformly heat up, has large heating surface, small power consumption, long service life and good heat preservation performance, and has wide market prospect.
Drawings
FIG. 1 is an exploded view of an alumina ceramic heater tube according to the present invention;
fig. 2 is a schematic structural view of the tumble dryer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying fig. 1-2 and the detailed description thereof.
Example 1
The utility model provides an alumina ceramics heating tube, includes alumina ceramics pipe, silica gel layer, electric heat tungsten line, silver wire, silica gel layer 8 sets up at alumina ceramics pipe 10 surfaces, electric heat tungsten line 9 sets up between silica gel layer 8 and alumina ceramics pipe 10, electric heat tungsten line 9 both ends department is provided with silver wire 12.
The thickness of the alumina ceramic tube is 0.3mm, and the density is 3.9g/cm3The resistance is 0.6 omega; the thickness of the silica gel layer is 1.9mm, and the silica gel layer can resist temperature of 350 ℃; the thickness of the electric heating tungsten wire is 0.05mm, and the diameter of the silver wire is 0.1 mm.
The preparation method of the heating tube comprises the following steps:
the preparation method comprises the following steps: adding 0.04 weight percent of Mg (NO) into 100 weight percent of nano alumina powder3)2 6H2O, 0.05 part of CaCl2 2H2O, 0.09 part of Al (NO)3)3 9H2O, 0.01 part of Si (OC)2H5)42.4 parts of oleic acid, 1.2 parts of polyethylene glycol 600, 8 parts of high-purity ethyl cellulose ether and 12 parts of deionized water are put into a mixer and mixed for 5 hours at the temperature below 30 ℃ to prepare alumina ceramic tube pug with uniform dispersion and 75 percent of solid content;
step (2) forming an aluminum dioxide ceramic tube: adding the pug prepared in the step one into a screw type ceramic extrusion forming machine with a vacuum defoaming device, and extruding the ceramic pug into a hollow and thin-wall ceramic blank pipe through a die head under the pushing of a screw;
drying the alumina ceramic blank tube: transferring the ceramic blank pipe prepared in the step two to a rolling dryer, and drying and dehydrating for 5 minutes under the condition of 49 ℃ hot air to obtain the ceramic blank pipe with the roundness and the straightness meeting the requirements;
step four, glue discharging of the aluminum oxide ceramic green tube: biscuit firing the ceramic green tube prepared in the step three at 1190 ℃ to obtain a ceramic biscuit firing tube;
firing the aluminum oxide ceramic: placing the ceramic biscuit firing tube obtained in the step four in a high-temperature molybdenum tube, and firing at 1550 ℃ in a hydrogen atmosphere to obtain an alumina ceramic tube;
preparing an electrothermal tungsten wire on the surface of the alumina ceramic tube: printing the thick-film electric heating tungsten wire on the outer surface of the alumina ceramic tube prepared in the fifth step by adopting a screen printing technology, and then transferring the thick-film electric heating tungsten wire into a normal-pressure hydrogen furnace to sinter at 1480 ℃ to obtain an electric heating tungsten wire co-fired alumina ceramic heating tube;
preparing a silica gel layer on the surface of the aluminum oxide ceramic tube: and welding two ends of the electric heating tungsten wire of the ceramic heating tube prepared in the sixth step and the silver wire into a whole by adopting a laser welding technology, then pouring a silica gel layer on the outer surface of the ceramic heating tube, and obtaining a finished product after the silica gel layer is solidified.
The purity of the nano alumina powder used in the step one is more than or equal to 99.99 percent, the particle diameter is 350nm, and the specific surface area is 7m2/g。
Example 2
The utility model provides an alumina ceramics heating tube, includes alumina ceramics pipe, silica gel layer, electric heat nickel line, silver wire, silica gel layer 8 sets up at alumina ceramics pipe 10 surfaces, electric heat nickel line 9 sets up between silica gel layer 8 and alumina ceramics pipe 10, electric heat nickel line 9 both ends department is provided with silver wire 12.
The thickness of the alumina ceramic tube is 0.4mm, and the density is 3.9g/cm3The resistance is 0.8 omega; the thickness of the silica gel layer is 1.5mm, and the silica gel layer can resist temperature of 340 ℃; the thickness of the electric heating nickel wire is 0.04mm, and the diameter of the silver wire is 0.14 mm.
The preparation method of the heating tube comprises the following steps:
the preparation method comprises the following steps: adding 0.02 portion of Mg (NO) into 100 portions of nano alumina powder according to the weight percentage3)2 6H2O, 0.03 part of CaCl2 2H2O， Al2O30.07 part of Al (NO)3)3 9H2O, 0.03 part of Si (OC)2H5)42.0 parts of oleic acid, 1.5 parts of ethylene glycol, 8 parts of polyvinyl alcohol and 20 parts of deionized water are put into a mixer and mixed for 3 hours at the temperature below 30 ℃ to prepare alumina ceramic tube pug with uniform dispersion and 78% of solid content;
step (2) forming an aluminum dioxide ceramic tube: adding the pug prepared in the step one into a screw type ceramic extrusion forming machine with a vacuum defoaming device, and extruding the ceramic pug into a hollow and thin-wall ceramic blank pipe through a die head under the pushing of a screw;
drying the alumina ceramic blank tube: transferring the ceramic blank pipe prepared in the step two to a rolling dryer, and drying and dehydrating for 7 minutes under the condition of hot air at 45 ℃ to obtain the ceramic blank pipe with the roundness and the straightness meeting the requirements;
step four, glue discharging of the aluminum oxide ceramic green tube: biscuit firing the ceramic green tube prepared in the third step at 1150 ℃ to obtain a ceramic biscuit firing tube;
firing the aluminum oxide ceramic: placing the ceramic biscuit firing tube obtained in the step four in a high-temperature molybdenum tube, and firing at 1540 ℃ in a hydrogen atmosphere to obtain an alumina ceramic tube;
preparing an electrothermal nickel wire on the surface of the alumina ceramic tube: printing the thick-film electric heating nickel wire on the outer surface of the alumina ceramic tube prepared in the fifth step by adopting a screen printing technology, and then transferring the thick-film electric heating nickel wire into a normal-pressure hydrogen furnace to sinter at 1000 ℃ to obtain an electric heating nickel wire co-fired alumina ceramic heating tube;
preparing a silica gel layer on the surface of the aluminum oxide ceramic tube: and welding two ends of the electrothermal nickel wire of the ceramic heating tube prepared in the sixth step and the silver wire into a whole by adopting a laser welding technology, then pouring a silica gel layer on the outer surface of the ceramic heating tube, and obtaining a finished product after the silica gel layer is solidified.
The purity of the nano alumina powder used in the step one is more than or equal to 99.99 percent, the particle diameter is 420nm, and the specific surface area is 8m2/g。
Example 3
The utility model provides an alumina ceramics heating tube, includes alumina ceramics pipe, silica gel layer, electric heat tungsten line, silver wire, silica gel layer 8 sets up at alumina ceramics pipe 10 surfaces, electric heat tungsten line 9 sets up between silica gel layer 8 and alumina ceramics pipe 10, electric heat tungsten line 9 both ends department is provided with silver wire 12.
The thickness of the alumina ceramic tube is 0.5mm, and the density is 3.9g/cm3The resistance is 1.5 omega; the thickness of the silica gel layer is 1.2mm, and the silica gel layer can resist temperature of 390 ℃; the thickness of the electric heating tungsten wire is 0.03mm, and the diameter of the silver wire is 0.19 mm。
The preparation method of the heating tube comprises the following steps:
the preparation method comprises the following steps: adding 0.03 part of Mg (NO) into 100 parts of nano alumina powder according to weight percentage3)2 6H2O, 0.01 part of CaCl2 2H2O, 0.06 parts of Al (NO)3)3 9H2O, 0.05 part of Si (OC)2H5)41.6 parts of oleic acid, 1.8 parts of glycerol, 4 parts of hydroxypropyl methyl cellulose ether and 28 parts of deionized water are put into a mixer and mixed for 2 hours at the temperature below 30 ℃ to prepare alumina ceramic tube pug with uniform dispersion and 84 percent of solid content;
step (2) forming an aluminum dioxide ceramic tube: adding the pug prepared in the step one into a screw type ceramic extrusion forming machine with a vacuum defoaming device, and extruding the ceramic pug into a hollow and thin-wall ceramic blank pipe through a die head under the pushing of a screw;
drying the alumina ceramic blank tube: transferring the ceramic blank pipe prepared in the step two to a rolling dryer, and drying and dehydrating for 9 minutes under the condition of 40 ℃ hot air to obtain the ceramic blank pipe with the roundness and the straightness meeting the requirements;
step four, glue discharging of the aluminum oxide ceramic green tube: biscuit firing the ceramic green tube prepared in the third step at 1120 ℃ to obtain a ceramic biscuit firing tube;
firing the aluminum oxide ceramic: placing the ceramic biscuit firing tube obtained in the step four in a high-temperature molybdenum tube, and firing at 1590 ℃ in a hydrogen atmosphere to obtain an alumina ceramic tube;
preparing an electrothermal tungsten wire on the surface of the alumina ceramic tube: printing the thick-film electric heating tungsten wire on the outer surface of the alumina ceramic tube prepared in the fifth step by adopting a screen printing technology, and then transferring the thick-film electric heating tungsten wire into a normal-pressure hydrogen furnace to sinter at 1400 ℃ to obtain an electric heating tungsten wire co-fired alumina ceramic heating tube;
preparing a silica gel layer on the surface of the aluminum oxide ceramic tube: and welding two ends of the electric heating tungsten wire of the ceramic heating tube prepared in the sixth step and the silver wire into a whole by adopting a laser welding technology, then pouring a silica gel layer on the outer surface of the ceramic heating tube, and obtaining a finished product after the silica gel layer is solidified.
The purity of the nano alumina powder used in the first step is more than or equal to 99.99 percent, the particle diameter is 490nm, and the specific surface area is 9m2/g。
The structure of the rolling dryer comprises a rack 1, a fan heater 2, a motor 3, a belt 4, a hot air pipe 5, a pipe frame 6 and stainless steel pipes 7, wherein the motor 3 is arranged at the bottom of the rack 1, the pipe frame 6 is arranged at the top of the rack 1, more than 2 stainless steel pipes 7 are arranged on the pipe frame 6, and the belt 4 is arranged between the stainless steel pipes 7 and the motor 3; and an air inlet at one end of the hot air pipe 5 is connected with the fan heater 2, and an air outlet at the other end of the hot air pipe is arranged at the top of the stainless steel pipe 7.
The diameter of the stainless steel tube 7 is 15mm, the length is 550mm, the distance between the stainless steel tubes is 1.5mm, and the rotating speed of the stainless steel tubes is 6 revolutions per minute.
Claims (7)
1. An alumina ceramic heating tube is characterized in that: the electric heating tungsten wire or the nickel wire is arranged between the silica gel layer and the alumina ceramic tube, and the silver wires are arranged at two ends of the electric heating tungsten wire or the nickel wire;
the thickness of the alumina ceramic tube is 0.3-0.5 mm, and the density is not less than 3.9g/cm3The resistance is 0.5-2 omega;
the preparation method of the alumina ceramic heating tube comprises the following steps:
the preparation method comprises the following steps: adding 0.01-0.05 part of MgO introducing agent, 0.01-0.05 part of CaO introducing agent and 0.05-0.1 part of Al into 100 parts of nano alumina powder according to weight percentage2O3Introducing agent and 0.01-0.05 part of SiO2Introducing an introducing agent, 1.5-2.5 parts of oleic acid, 1-2 parts of a lubricating agent, 3-15 parts of a binder and 10-30 parts of deionized water into a mixer, and mixing at the temperature of below 30 ℃ for 1-5 hours to prepare alumina ceramic tube pug with uniform dispersion and 75-85% of solid content;
step (2) forming an aluminum dioxide ceramic tube: adding the pug prepared in the step one into a screw type ceramic extrusion forming machine with a vacuum defoaming device, and extruding the ceramic pug into a hollow and thin-wall ceramic blank pipe through a die head under the pushing of a screw;
step three, drying the aluminum trioxide ceramic blank tube: transferring the ceramic blank pipe prepared in the step two to a rolling dryer, and drying and dehydrating for 5-10 minutes under the condition of hot air at 40-50 ℃ to obtain the ceramic blank pipe with the roundness and the straightness meeting the requirements;
step four, glue discharging of the aluminum oxide ceramic green tube: biscuit firing the ceramic green tube prepared in the third step at 1100-1200 ℃ to obtain a ceramic biscuit firing tube;
firing the alumina ceramic: placing the ceramic biscuit firing tube obtained in the step four in a high-temperature molybdenum tube, and firing at 1500-1600 ℃ in a hydrogen atmosphere to obtain an alumina ceramic tube;
preparing an electrothermal tungsten wire or a nickel wire on the surface of the alumina ceramic tube: printing a thick-film electric heating tungsten wire or a nickel wire on the outer surface of the alumina ceramic tube prepared in the fifth step by adopting a screen printing technology, and then transferring the thick-film electric heating tungsten wire or the nickel wire into a normal-pressure hydrogen furnace to be sintered at 1000-1500 ℃ to obtain an electric heating tungsten wire or nickel wire co-fired alumina ceramic heating tube;
preparing a silica gel layer on the surface of the aluminum oxide ceramic tube: welding two ends of the electric heating tungsten wire or the nickel wire of the ceramic heating tube prepared in the sixth step and the silver wire into a whole by adopting a welding technology, then pouring a silica gel layer on the outer surface of the ceramic heating tube, and obtaining a finished product after the silica gel layer is solidified;
in the step one, the MgO introducing agent is Mg (NO)3)2 6H2The introducing agent of O and CaO is CaCl2 2H2O， Al2O3The introducing agent is Al (NO)3)3 9H2O， SiO2The introducing agent is Si (OC)2H5)4。
2. The alumina ceramic heater tube according to claim 1, wherein: the thickness of silica gel layer is 1 ~ 2mm, temperature resistant 300 ~ 400 ℃.
3. The alumina ceramic heater tube according to claim 1, wherein: the thickness of the electrothermal tungsten wire or the nickel wire is 0.03-0.05 mm, and the diameter of the silver wire is 0.1-0.2 mm.
4. The alumina ceramic heater tube according to claim 1, wherein: the purity of the nano alumina powder used in the step one is more than or equal to 99.99%, the particle size is 300-500 nm, and the specific surface area is 6-10 m2/g。
5. The alumina ceramic heater tube according to claim 1, wherein: in the first step, the adhesive is one of high-purity ethyl cellulose ether, polyvinyl alcohol, hydroxypropyl methyl cellulose ether and hydroxypropyl ethyl cellulose ether powder, and the lubricant is one of glycerol, ethylene glycol, polyethylene glycol 600 and polyethylene glycol 1000.
6. The alumina ceramic heater tube according to claim 1, wherein: the structure of the rolling dryer in the third step is composed of a rack (1), a fan heater (2), a motor (3), a belt (4), a hot air pipe (5), a pipe frame (6) and stainless steel pipes (7), wherein the motor (3) is arranged at the bottom of the rack (1), the pipe frame (6) is arranged at the top of the rack (1), more than 2 stainless steel pipes (7) are arranged on the pipe frame (6), and the belt (4) is arranged between the stainless steel pipes (7) and the motor (3); and an air inlet at one end of the hot air pipe (5) is connected with the warm air blower (2), and an air outlet at the other end of the hot air pipe is arranged at the top of the stainless steel pipe (7).
7. The alumina ceramic heater tube according to claim 6, wherein: the diameter of the stainless steel tube (7) is 10-20 mm, the length is 500-600 mm, the distance between the stainless steel tubes is 1-2 mm, and the rotating speed of the stainless steel tubes is 3-10 revolutions per minute.
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