CN110041056A - A kind of alumina ceramic heating pipe and preparation method thereof - Google Patents
A kind of alumina ceramic heating pipe and preparation method thereof Download PDFInfo
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- CN110041056A CN110041056A CN201910371121.XA CN201910371121A CN110041056A CN 110041056 A CN110041056 A CN 110041056A CN 201910371121 A CN201910371121 A CN 201910371121A CN 110041056 A CN110041056 A CN 110041056A
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- H05B3/00—Ohmic-resistance heating
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Abstract
A kind of alumina ceramic heating pipe and preparation method thereof, including alumina ceramic tube, layer of silica gel, electric heating tungsten wire or nickel wire, silver wire, the layer of silica gel is arranged in aluminium oxide ceramics tube outer surface, the electric heating tungsten wire or nickel wire are arranged between layer of silica gel and alumina ceramic tube, silver wire is provided at the electric heating tungsten wire or nickel wire both ends, the alumina ceramic tube is not less than 3.9g/cm with a thickness of 0.3~0.5mm, density3, resistance is 0.5~2 Ω, the layer of silica gel with a thickness of 1~2mm, can be 300~400 DEG C of heatproof, the electric heating tungsten wire or nickel wire with a thickness of 0.03~0.05mm, the diameter of the silver wire is 0.1~0.2 mm.The present invention prepares ultrathin alumina ceramic tube by ceramics extrusion moulding process, can Quick uniform heating, heating surface is big, power consumption is small, long service life, good heat insulating, therefore have a vast market foreground.
Description
Technical field
The invention belongs to alumina ceramic heating body fields, and in particular to a kind of alumina ceramic heating pipe and its preparation side
Method.
Background technique
Fire-cured tobacco type electronic cigarette heater element mainly has common alumina ceramic heating body currently on the market, such as patent CN
208369873 U, CN 208274083 U, CN 207968984 U and 204498395 U of CN and zirconia ceramics fever
Body, such as 108966382 A of patent CN.Both ceramic heating elements expose some defects in use, such as patent CN
Alumina ceramic heating body described in 207968984 U and CN104446507 is raw by inside and outside two layers of aluminium oxide using pipe rolling technique
Base cast sheet is wound into ceramic tube and prints tungsten conducting wire between inside and outside two-layer ceramic green compact, and aluminium oxide ceramics hair is made in last cofiring
Thermal element, this ceramic heating element is in the presence of there are bonding cracks among (1) ceramic tube, unsightly；(2) ceramic heating element uses
Peculiar smell can be generated in the process；(3) ceramic heating element heat loss is too fast, and power consumption is larger.For another example patent CN 208274083
There are cross ceramic components to be not easy the disadvantages of preparing for the ceramic heating element of multi-panel fever type described in U.Furthermore patent CN
Zirconia ceramics heater described in 108966382 A uses slice structure, and tungsten wire is directly printed on zirconium oxide biscuit piece table
Face, then cofiring obtains zirconia heating element, and this slice structure heater element is too small in the presence of (1) heating surface, causes pipe tobacco
Flue-cured tobacco is insufficient；(2) zirconia ceramics thermal conductivity is poor, thermal expansion coefficient is big, frangibility in use process；(3) electric heating tungsten wire every
Hotting mask is easy to fall off to keep tungsten wire oxidizable.Therefore, seeking one kind can Quick uniform heating, beautiful, intensity height, thermal conductivity height, fever
The common requirements that face is big, power consumption is small, ceramic heating element with long service life is fire-cured tobacco type electronic cigarette industry.High purity aluminium oxide
Ceramics are due to the advantages that electrical insulating property is good, intensity is high, thermal conductivity is good, translucency, easy-sintering, in ceramic lamp, such as patent CN
102659415 A and CN 200910044200.6 and LED heat dissipation, such as 108,610,026 102777809 A of A, CN of patent CN,
Equal fields obtain relatively broad application.Using superthin structure (0.3~0.5mm of wall thickness) (thermal resistance is small), electrical insulating property is good, intensity
The good high-purity alumina ceramic pipe with translucency (good appearance) of high (> 400MPa), thermal conductivity makes electronic cigarette heater element
It is a preferably technical solution.
Currently, cold isostatic compaction technology production high-purity alumina ceramic pipe is industrially widely used.Using this technology
When making ultra-thin (0.3~0.5mm of wall thickness) alumina tube, compacting ceramic aggregate particle is in rubber mold and WC newel gap
It is difficult to be uniformly distributed, ceramic tube has became uneven after molding.Therefore it is super with mass production to seek new forming technique
Thin (0.3 ~ 0.5mm of wall thickness), high-densit high-purity alumina ceramic pipe are a difficult points of the invention.Transparent alumina ceramics
Preparation is generally needed to be added a small amount of additive.Being used as described in 86101452 A of patent CN 105541302 A and CN
MgO、ZrO2、Y2O3、La2O3Ternary or quaternary mixing and doping formula, these Doped ions are solid-solubilized in principal crystalline phase, and it is abnormal to generate lattice
Become, it is suppressed that principal crystalline phase crystal boundary migration rate under high temperature promotes the discharge of intergranular stomata, but made by these doping formulas
Standby aluminium oxide ceramics firing temperature is relatively high (1780~1820 DEG C), the serious curtailment service life of kiln refractory material.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of heating of Quick uniform, intensity is high, thermal conductivity is high, heating surface
Greatly, power consumption is small, alumina ceramic heating pipe with long service life and preparation method thereof.
In order to solve the above technical problems, the technical scheme is that a kind of alumina ceramic heating pipe, feature exist
In: including alumina ceramic tube, layer of silica gel, electric heating tungsten wire or nickel wire, silver wire, the layer of silica gel is arranged in alumina ceramic tube
Outer surface, the electric heating tungsten wire or nickel wire are arranged between layer of silica gel and alumina ceramic tube, and the electric heating tungsten wire is set at both ends
It is equipped with silver wire.
The alumina ceramic tube is not less than 3.9g/cm with a thickness of 0.3~0.5mm, density3, tungsten wire or nickel wire resistance are
0.5~2 Ω.
The layer of silica gel with a thickness of 300~400 DEG C of 1~2mm, heatproof.
The electric heating tungsten wire or nickel wire with a thickness of 0.03~0.05mm, the diameter of the silver wire is 0.1~0.2 mm.
The preparation method of above-mentioned alumina ceramic heating pipe, it is characterised in that include the following steps:
The preparation of step 1 alumina ceramic tube pug: being added in 100 parts of nano alumina powders by weight percentage, 0.01~
0.05 part of MgO introduces agent, 0.01~0.05 part of CaO introduces agent, 0.05~0.1 part of Al2O3Introduce agent, 0.01~0.05 part of SiO2
It introduces agent, 1.5~2.5 parts of oleic acid, 1~2 part of lubricant, 3~15 parts of binders and 10~30 parts of deionized waters and is put into mixing
In machine, carry out 1~5h of mixing in 30 DEG C of following temperature, prepare be uniformly dispersed, solid content be 75~85% alumina ceramic tube
Pug；
The molding of step 2 alumina ceramic tube: the pug of step 1 preparation is added to the screw ceramics with vacuum defoaming device
In extrusion shaping machine, ceramic material is extruded into hollow, thin wall ceramic shell by mould head under screw rod promotion；
The drying of step 3 aluminium oxide ceramics shell: ceramic blank pipe prepared by step 2 is moved on roll-drying machine,
Under the conditions of 40~50 DEG C of hot winds, drying and dehydrating 5~10 minutes, circularity and the directly satisfactory ceramic green pipe of degree are obtained；
The dumping of step 4 aluminium oxide ceramics green tube: by step 3 prepare ceramic green pipe, at 1100~1200 DEG C into
Row biscuiting obtains ceramic biscuiting pipe；
The firing of step five aluminium oxide ceramic: step 4 ceramics biscuiting pipe is placed in high temperature molybdenum tube at 1500~1600 DEG C
It is fired in a hydrogen atmosphere, obtains alumina ceramic tube；
The preparation of step 6 aluminium oxide ceramics pipe surface electric heating tungsten wire or nickel wire: by alumina ceramic tube prepared by step 5,
Thick film electric heating tungsten wire or nickel wire are printed in its outer surface using screen printing technique, be then transported in atmospheric hydrogen furnace in
It is sintered at 1000~1500 DEG C, obtains electric heating tungsten wire or nickel wire cofiring alumina ceramic heating pipe；
The preparation of step 7 alumina ceramic tube surface layer of silica gel: by the electric heating tungsten wire of ceramic heating tube prepared by step 6 or
Nickel wire both ends are integrally welded with silver wire welding technique respectively, are then poured layer of silica gel in ceramic heating tube outer surface again, to
Finished product is obtained after layer of silica gel solidification.
Nano aluminium oxide powder purity used in the step 1 be greater than or equal to 99.99%, grain diameter be 300~
500nm, specific surface area are 6~10m2/g。
It is Mg (NO that MgO, which introduces agent, in the step 13)2 6H2It is CaCl that O, CaO, which introduce agent,2 2H2O, Al2O3It introduces
Agent is Al (NO3)3 9H2O, SiO2Introducing agent is Si (OC2H5)4。
Adhesive is high-purity cellulose ether, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, hydroxypropyl in the step 1
One of base cellulose ether powder, lubricant are glycerol, ethylene glycol, Macrogol 600, one in cetomacrogol 1000
Kind.
The structure of roll-drying machine is by rack, warm-air drier, motor, belt, hot air pipe, pipe support, stainless in the step 3
Steel pipe is constituted, and the motor setting is provided with 2 or more in bottom of the frame, pipe support setting on frame top, the pipe support
Stainless steel tube is provided with belt between the stainless steel tube and motor；Described hot air pipe one end air inlet is connected with warm-air drier, separately
One end air outlet is arranged at the top of stainless steel tube.
The diameter of the stainless steel tube is 10~20mm, and length is 500~600mm, and the spacing of stainless steel tube is 1~2mm,
The revolving speed of stainless steel tube is 3~10 revs/min.
Adapting to the ultrathin alumina pipe new situation not high to light transmittance requirement, in the invention patent using MgO, CaO,
Al2O3、SiO2Quaternary newly adulterates formula, which matches can form less micro CaO-Al in Membranes On Alumina Particles Surface2O3-SiO2
Glass phase can significantly reduce Alumina Ceramics Sintering temperature (1500~1600 DEG C) and alumina grain is inhibited to grow；In addition,
Ultrathin alumina ceramics tube outer surface electric heating tungsten wire or nickel wire upper layer of silica gel resistant to high temperature are also one technology wound of the present invention
New point.Oxidizable tungsten wire can not only be completely cut off air by the layer of silica gel, and have good guarantor since silica gel thermal conductivity is extremely low
Power consumption when ceramic heating element work can be effectively reduced in warm nature energy.
The present invention prepares ultrathin alumina ceramic tube by ceramics extrusion moulding process, then in outer ceramic surface cofiring
Electric heating tungsten wire is formed, finally thicker layer of silica gel is formed in electric heating tungsten wire or nickel wire surface casting, significantly improves ceramic heating
Its outer surface heat loss phenomenon is effectively reduced in body running face heat-conductive characteristic, can Quick uniform heating, heating surface to obtain
Greatly, power consumption is small, alumina ceramic heating pipe of long service life, good heat insulating, therefore has a vast market foreground.
Detailed description of the invention
Fig. 1 is alumina ceramic heating pipe structural decomposition diagram of the present invention；
Fig. 2 is the structural schematic diagram of roll-drying machine.
Specific embodiment
The present invention is described in further detail for 1-2 and specific embodiment with reference to the accompanying drawing.
Embodiment 1
A kind of alumina ceramic heating pipe, including alumina ceramic tube, layer of silica gel, electric heating tungsten wire, silver wire, the layer of silica gel 8
Setting is arranged between layer of silica gel 8 and alumina ceramic tube 10 in 10 outer surface of alumina ceramic tube, the electric heating tungsten wire 9, institute
It states and is provided with silver wire 12 at 9 both ends of electric heating tungsten wire.
The alumina ceramic tube is with a thickness of 0.3mm, density 3.9g/cm3, resistance is 0.6 Ω；The thickness of the layer of silica gel
Degree be 1.9mm, can be 350 DEG C of heatproof；The electric heating tungsten wire with a thickness of 0.05mm, the diameter of the silver wire is 0.1 mm.
The preparation method of the heat-generating pipe, includes the following steps:
The preparation of step 1 alumina ceramic tube pug: it is added in 100 parts of nano alumina powders by weight percentage, 0.04 part
Mg(NO3)2 6H2O, 0.05 part of CaCl2 2H2O, 0.09 part of Al (NO3)3 9H2O, 0.01 part of Si (OC2H5)4, 2.4 parts of oleic acid, 1.2
Part Macrogol 600,8 parts of high-purity cellulose ethers and 12 parts of deionized waters are put into batch mixer, in 30 DEG C of following temperature
Carry out mixing 5h, prepare be uniformly dispersed, solid content be 75% alumina ceramic tube pug；
The molding of step 2 alumina ceramic tube: the pug of step 1 preparation is added to the screw ceramics with vacuum defoaming device
In extrusion shaping machine, ceramic material is extruded into hollow, thin wall ceramic shell by mould head under screw rod promotion；
The drying of step 3 aluminium oxide ceramics shell: ceramic blank pipe prepared by step 2 is moved on roll-drying machine,
Under the conditions of 49 DEG C of hot winds, drying and dehydrating 5 minutes, circularity and the directly satisfactory ceramic green pipe of degree are obtained；
The dumping of step 4 aluminium oxide ceramics green tube: ceramic green pipe prepared by step 3 carries out biscuiting at 1190 DEG C,
Obtain ceramic biscuiting pipe；
The firing of step five aluminium oxide ceramic: step 4 ceramics biscuiting pipe is placed in high temperature molybdenum tube at 1550 DEG C in hydrogen
It is fired under atmosphere, obtains alumina ceramic tube；
The preparation of step 6 aluminium oxide ceramics pipe surface electric heating tungsten wire: by alumina ceramic tube prepared by step 5, using silk
Net printing technology is printed on thick film electric heating tungsten wire in its outer surface, is then transported in atmospheric hydrogen furnace and is sintered at 1480 DEG C,
Obtain electric heating tungsten wire cofiring alumina ceramic heating pipe；
The preparation of step 7 alumina ceramic tube surface layer of silica gel: by the electric heating tungsten wire two of ceramic heating tube prepared by step 6
End is integrally welded using laser welding technology with silver wire respectively, is then poured layer of silica gel in ceramic heating tube outer surface again,
Finished product is obtained after layer of silica gel solidification.
Nano aluminium oxide powder purity used in the step 1 is greater than or equal to 99.99%, grain diameter 350nm, than
Surface area is 7m2/g。
Embodiment 2
A kind of alumina ceramic heating pipe, including alumina ceramic tube, layer of silica gel, electric heating nickel wire, silver wire, the layer of silica gel 8
Setting is arranged between layer of silica gel 8 and alumina ceramic tube 10 in 10 outer surface of alumina ceramic tube, the electric heating nickel wire 9, institute
It states and is provided with silver wire 12 at 9 both ends of electric heating nickel wire.
The alumina ceramic tube is with a thickness of 0.4mm, density 3.9g/cm3, resistance is 0.8 Ω；The thickness of the layer of silica gel
Degree be 1.5mm, can be 340 DEG C of heatproof；The electric heating nickel wire with a thickness of 0.04mm, the diameter of the silver wire is 0.14 mm.
The preparation method of the heat-generating pipe, includes the following steps:
The preparation of step 1 alumina ceramic tube pug: it is added in 100 parts of nano alumina powders by weight percentage, 0.02 part
Mg(NO3)2 6H2O, 0.03 part of CaCl2 2H2O, Al2O3, 0.07 part of Al (NO3)3 9H2O, 0.03 part of Si (OC2H5)4, 2.0 parts
Oleic acid, 1.5 parts of ethylene glycol, 8 parts of polyvinyl alcohol and 20 parts of deionized waters are put into batch mixer, are mixed in 30 DEG C of following temperature
Refine 3h, prepare be uniformly dispersed, solid content be 78% alumina ceramic tube pug；
The molding of step 2 alumina ceramic tube: the pug of step 1 preparation is added to the screw ceramics with vacuum defoaming device
In extrusion shaping machine, ceramic material is extruded into hollow, thin wall ceramic shell by mould head under screw rod promotion；
The drying of step 3 aluminium oxide ceramics shell: ceramic blank pipe prepared by step 2 is moved on roll-drying machine,
Under the conditions of 45 DEG C of hot winds, drying and dehydrating 7 minutes, circularity and the directly satisfactory ceramic green pipe of degree are obtained；
The dumping of step 4 aluminium oxide ceramics green tube: ceramic green pipe prepared by step 3 carries out biscuiting at 1150 DEG C,
Obtain ceramic biscuiting pipe；
The firing of step five aluminium oxide ceramic: step 4 ceramics biscuiting pipe is placed in high temperature molybdenum tube at 1540 DEG C in hydrogen
It is fired under atmosphere, obtains alumina ceramic tube；
The preparation of step 6 aluminium oxide ceramics pipe surface electric heating nickel wire: by alumina ceramic tube prepared by step 5, using silk
Net printing technology is printed on thick film electric heating nickel wire in its outer surface, is then transported in atmospheric hydrogen furnace and is sintered at 1000 DEG C,
Obtain electric heating nickel wire cofiring alumina ceramic heating pipe；
The preparation of step 7 alumina ceramic tube surface layer of silica gel: by the electric heating nickel wire two of ceramic heating tube prepared by step 6
End is integrally welded using laser welding technology with silver wire respectively, is then poured layer of silica gel in ceramic heating tube outer surface again,
Finished product is obtained after layer of silica gel solidification.
Nano aluminium oxide powder purity used in the step 1 is greater than or equal to 99.99%, grain diameter 420nm, than
Surface area is 8m2/g。
Embodiment 3
A kind of alumina ceramic heating pipe, including alumina ceramic tube, layer of silica gel, electric heating tungsten wire, silver wire, the layer of silica gel 8
Setting is arranged between layer of silica gel 8 and alumina ceramic tube 10 in 10 outer surface of alumina ceramic tube, the electric heating tungsten wire 9, institute
It states and is provided with silver wire 12 at 9 both ends of electric heating tungsten wire.
The alumina ceramic tube is with a thickness of 0.5mm, density 3.9g/cm3, resistance is 1.5 Ω；The thickness of the layer of silica gel
Degree be 1.2mm, can be 390 DEG C of heatproof；The electric heating tungsten wire with a thickness of 0.03mm, the diameter of the silver wire is 0.19 mm.
The preparation method of the heat-generating pipe, includes the following steps:
The preparation of step 1 alumina ceramic tube pug: it is added in 100 parts of nano alumina powders by weight percentage, 0.03 part
Mg(NO3)2 6H2O, 0.01 part of CaCl2 2H2O, 0.06 part of Al (NO3)3 9H2O, 0.05 part of Si (OC2H5)4, 1.6 parts of oleic acid, 1.8
Part glycerol, 4 parts of hydroxypropyl methyl cellulose ethers and 28 parts of deionized waters are put into batch mixer, are mixed in 30 DEG C of following temperature
Refine 2h, prepare be uniformly dispersed, solid content be 84% alumina ceramic tube pug；
The molding of step 2 alumina ceramic tube: the pug of step 1 preparation is added to the screw ceramics with vacuum defoaming device
In extrusion shaping machine, ceramic material is extruded into hollow, thin wall ceramic shell by mould head under screw rod promotion；
The drying of step 3 aluminium oxide ceramics shell: ceramic blank pipe prepared by step 2 is moved on roll-drying machine,
Under the conditions of 40 DEG C of hot winds, drying and dehydrating 9 minutes, circularity and the directly satisfactory ceramic green pipe of degree are obtained；
The dumping of step 4 aluminium oxide ceramics green tube: ceramic green pipe prepared by step 3 carries out biscuiting at 1120 DEG C,
Obtain ceramic biscuiting pipe；
The firing of step five aluminium oxide ceramic: step 4 ceramics biscuiting pipe is placed in high temperature molybdenum tube at 1590 DEG C in hydrogen
It is fired under atmosphere, obtains alumina ceramic tube；
The preparation of step 6 aluminium oxide ceramics pipe surface electric heating tungsten wire: by alumina ceramic tube prepared by step 5, using silk
Net printing technology is printed on thick film electric heating tungsten wire in its outer surface, is then transported in atmospheric hydrogen furnace and is sintered at 1400 DEG C,
Obtain electric heating tungsten wire cofiring alumina ceramic heating pipe；
The preparation of step 7 alumina ceramic tube surface layer of silica gel: by the electric heating tungsten wire two of ceramic heating tube prepared by step 6
End is integrally welded using laser welding technology with silver wire respectively, is then poured layer of silica gel in ceramic heating tube outer surface again,
Finished product is obtained after layer of silica gel solidification.
Nano aluminium oxide powder purity used in the step 1 is greater than or equal to 99.99%, grain diameter 490nm, than
Surface area is 9m2/g。
The structure of above-mentioned roll-drying machine is by rack 1, warm-air drier 2, motor 3, belt 4, hot air pipe 5, pipe support 6, stainless steel
Pipe 7 is constituted, the motor 3 setting in 1 bottom of rack, the setting of pipe support 6 be provided on 1 top of rack, the pipe support 62 with
On stainless steel tube 7, be provided with belt 4 between the stainless steel tube 7 and motor 3；5 one end air inlet of hot air pipe and warm wind
Machine 2 is connected, and the setting of other end air outlet is at 7 top of stainless steel tube.
The diameter of the stainless steel tube 7 is 15mm, and length 550mm, the spacing of stainless steel tube is 1.5mm, stainless steel tube
Revolving speed be 6 revs/min.
Claims (10)
1. a kind of alumina ceramic heating pipe, it is characterised in that: including alumina ceramic tube, layer of silica gel, electric heating tungsten wire or nickel wire,
Silver wire, the layer of silica gel setting are arranged in aluminium oxide ceramics tube outer surface, the electric heating tungsten wire or nickel wire in layer of silica gel and oxygen
Change between aluminium ceramic tube, is provided with silver wire at the electric heating tungsten wire or nickel wire both ends.
2. alumina ceramic heating pipe according to claim 1, it is characterised in that: the alumina ceramic tube with a thickness of
0.3~0.5mm, density are not less than 3.9g/cm3, resistance is 0.5~2 Ω.
3. alumina ceramic heating pipe according to claim 1, it is characterised in that: the layer of silica gel with a thickness of 1~
300~400 DEG C of 2mm, heatproof.
4. alumina ceramic heating pipe according to claim 1, it is characterised in that: the thickness of the electric heating tungsten wire or nickel wire
For 0.03~0.05mm, the diameter of the silver wire is 0.1~0.2 mm.
5. the preparation method of -4 any alumina ceramic heating pipes according to claim 1, it is characterised in that including walking as follows
It is rapid:
The preparation of step 1 alumina ceramic tube pug: being added in 100 parts of nano alumina powders by weight percentage, 0.01~
0.05 part of MgO introduces agent, 0.01~0.05 part of CaO introduces agent, 0.05~0.1 part of Al2O3Introduce agent, 0.01~0.05 part of SiO2
It introduces agent, 1.5~2.5 parts of oleic acid, 1~2 part of lubricant, 3~15 parts of binders and 10~30 parts of deionized waters and is put into mixing
In machine, carry out 1~5h of mixing in 30 DEG C of following temperature, prepare be uniformly dispersed, solid content be 75~85% alumina ceramic tube
Pug；
The molding of step 2 alumina ceramic tube: the pug of step 1 preparation is added to the screw ceramics with vacuum defoaming device
In extrusion shaping machine, ceramic material is extruded into hollow, thin wall ceramic shell by mould head under screw rod promotion；
The drying of step 3 aluminium oxide ceramics shell: ceramic blank pipe prepared by step 2 is moved on roll-drying machine,
Under the conditions of 40~50 DEG C of hot winds, drying and dehydrating 5~10 minutes, circularity and the directly satisfactory ceramic green pipe of degree are obtained；
The dumping of step 4 aluminium oxide ceramics green tube: by step 3 prepare ceramic green pipe, at 1100~1200 DEG C into
Row biscuiting obtains ceramic biscuiting pipe；
The firing of step five aluminium oxide ceramic: step 4 ceramics biscuiting pipe is placed in high temperature molybdenum tube at 1500~1600 DEG C
It is fired in a hydrogen atmosphere, obtains alumina ceramic tube；
The preparation of step 6 aluminium oxide ceramics pipe surface electric heating tungsten wire or nickel wire: by alumina ceramic tube prepared by step 5,
Thick film electric heating tungsten wire or nickel wire are printed in its outer surface using screen printing technique, be then transported in atmospheric hydrogen furnace in
It is sintered at 1000~1500 DEG C, obtains electric heating tungsten wire or nickel wire cofiring alumina ceramic heating pipe；
The preparation of step 7 alumina ceramic tube surface layer of silica gel: by the electric heating tungsten wire of ceramic heating tube prepared by step 6 or
Nickel wire both ends are integrally welded using welding technique with silver wire respectively, are then poured silica gel in ceramic heating tube outer surface again
Layer obtains finished product after layer of silica gel solidification.
6. preparation method according to claim 5, it is characterised in that: nano alumina powder used in the step 1 is pure
Degree is greater than or equal to 99.99%, and grain diameter is 300~500nm, and specific surface area is 6~10m2/g。
7. preparation method according to claim 5, it is characterised in that: it is Mg (NO that MgO, which introduces agent, in the step 13)2
6H2It is CaCl that O, CaO, which introduce agent,2 2H2O, Al2O3Introducing agent is Al (NO3)3 9H2O, SiO2Introducing agent is Si (OC2H5)4。
8. preparation method according to claim 5, it is characterised in that: adhesive is high-purity ethyl cellulose in the step 1
One of plain ether, polyvinyl alcohol, hydroxypropyl methyl cellulose ether, Hydroxypropyl ethyl cellulose ether powder, lubricant are glycerol, second
One of glycol, Macrogol 600, cetomacrogol 1000.
9. preparation method according to claim 5, it is characterised in that: the structure of roll-drying machine is by machine in the step 3
Frame (1), warm-air drier (2), motor (3), belt (4), hot air pipe (5), pipe support (6), stainless steel tube (7) are constituted, the motor (3)
Setting is provided with 2 or more stainless steels at the top of rack (1) in rack (1) bottom, pipe support (6) setting on the pipe support (6)
It manages (7), is provided with belt (4) between the stainless steel tube (7) and motor (3)；Hot air pipe (5) one end air inlet and warm wind
Machine (2) is connected, and the setting of other end air outlet is at the top of stainless steel tube (7).
10. preparation method according to claim 9, it is characterised in that: the diameter of the stainless steel tube (7) be 10~
20mm, length are 500~600mm, and the spacing of stainless steel tube is 1~2mm, and the revolving speed of stainless steel tube is 3~10 revs/min.
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