CN109180190A - A kind of production technology of U-shaped Elema - Google Patents
A kind of production technology of U-shaped Elema Download PDFInfo
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- CN109180190A CN109180190A CN201810989045.4A CN201810989045A CN109180190A CN 109180190 A CN109180190 A CN 109180190A CN 201810989045 A CN201810989045 A CN 201810989045A CN 109180190 A CN109180190 A CN 109180190A
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63416—Polyvinylalcohols [PVA]; Polyvinylacetates
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/148—Silicon, e.g. silicon carbide, magnesium silicide, heating transistors or diodes
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/616—Liquid infiltration of green bodies or pre-forms
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
- C04B2235/6587—Influencing the atmosphere by vaporising a solid material, e.g. by using a burying of sacrificial powder
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
Abstract
A kind of production technology of U-shaped Elema is related to a kind of production technology of U-shaped Elema.It is mainly uneven to solve the technique blank density of the U-shaped Elema heating part of existing production, the big problem of cold end resistivity and invent.Make the raw material of heater are as follows: F24 silicon carbide, F36 silicon carbide, F46 silicon carbide, F60 silicon carbide, F80 silicon carbide, 100F silicon carbide, 5S silicon carbide, D3E silicon carbide；Bonding agent is methylcellulose, and polyvinyl alcohol, glycerol is pure water；By F24 silicon carbide, 5S silicon carbide is first dry-mixed, after mixing with other wet mixings；Heater, is burnt by extrusion forming, drying with carbon shirt-circuiting furnace.Production cold end part of silicon carbide rod uses methylcellulose and polyvinyl alcohol as bonding agent；Powder is carborundum powder, graphite powder, wood powder, water；Each raw material mixing, extrusion forming dry, drying, siliconising.Advantage is that blank density is uniform, and the resistivity of cold end is small.
Description
Technical field:
The present invention relates to a kind of production technologies of U-shaped Elema.
Background technique:
U-shaped Elema can be regarded as to be connected in series by two equal diameter Elemas, and two heater lower ends are connected with one section of cold end
It picks up and.
The technique of the existing U-shaped Elema heating part of production produces after making blank forming there are the non-uniform problem of blank density
Raw elastic expansion and elastic after effect phenomenon, both phenomenons will lead to green body and generate longitudinal cracking.Since silicon carbide is recrystallizing
Contraction is not generated in sintering process, product density is to be determined by green density, therefore the preparation of high-densit green compact is that production is high
The prerequisite of performance electrothermal silicon carbide element.When bonding agent performance difference in material, it also will appear and caused because friction is excessive
The problem of crackle.In addition existing cold end resistivity is big, big energy-consuming.
Summary of the invention:
Technical problem to be solved by the invention is to provide a kind of production technology of U-shaped Elema, the heater green bodies of production
Even density, green body will not longitudinal crackings.The bonding agent performance of selection is good, is not in cause asking for crackle because friction is excessive
Topic.Cold end resistivity is small, and energy consumption is few.
Above-mentioned purpose is achieved in that
Make the raw material and weight ratio of heater are as follows: F24 silicon carbide 10kg, F36 silicon carbide 6.2kg, F46 silicon carbide 2.8kg,
F60 silicon carbide 7kg, F80 silicon carbide 7kg, 100F silicon carbide 10.5kg, 5S silicon carbide 12kg, D3E silicon carbide 7.5kg；
The raw material and weight ratio of bonding agent are as follows: methylcellulose 0.8kg, polyvinyl alcohol 0.8kg, glycerol 1kg, pure water are
4.2kg；
F24 silicon carbide 10kg, 5S silicon carbide 12kg is first dry-mixed in V-type mixing pot, and mixing moves back in round mixing pot,
In round mixing pot with F36 silicon carbide 6.2kg, F46 silicon carbide 2.8kg, F60 silicon carbide 7kg, F80 silicon carbide 7kg, 100F carbon
SiClx 10.5kg, D3E silicon carbide 7.5kg is dry-mixed, finally add methylcellulose 0.8kg, polyvinyl alcohol 0.8kg, glycerol 1kg,
Pure water 4.2kg carries out wet mixing；
Mixing pot must be white steel material, and avoiding impurity from being mixed into influences Elema performance.It the use of the purpose of pure water is also to avoid drawing
Enter impurity, bonding agent can generate preferable interface cohesion with silicon-carbide particle surface.Reducing friction helps particle in forming process
Middle rearrangement, makes blank Densification.
Uniformly mixed material is put into hard plastic extrusion molding in press, briquetting pressure is between 18-20Mpa；
Then it is dried, heater drying is exactly the process for being dehydrated plastic removal, and natural drying and drying box is divided to dry two steps, green compact
It dries 2-3 days, the green compact after natural drying are put into drying box drying, and 170 DEG C of drying temperature, drying time is 40 hours.
The heater after drying is burnt into carbon shirt-circuiting furnace, the process as recrystallized, recrystallization temperature is 2450 DEG C.
Production cold end part of silicon carbide rod uses methylcellulose and polyvinyl alcohol as bonding agent；
Powder is carborundum powder (180 mesh), graphite powder (200 mesh), wood powder (60 mesh), water；
The weight ratio of each raw material are as follows: methylcellulose 2kg, polyvinyl alcohol 2kg, carborundum powder 52kg, graphite powder 40kg, wood powder
4kg, water 20kg.
Various raw materials are mixed in mixing pot in the ratio first, mixing can form after forty minutes, with 300 tons
Four-column hydraulic press extrusion forming, green compact after molding are first dried 48 hours, are then dried in drying box 10 hours, drying temperature
Degree is 170 DEG C, keeps the temperature 4 hours again under the conditions of 170 DEG C, so that it may siliconising.Siliconising use metallic silicon model be
" 441 ", the equipment used are the carbon shirt-circuiting furnace of nitrogen protection, and the weight of metallic silicon is 1.2 times of green compact weight, and siliconising temperature is
1850 DEG C, fltting speed is 20 millimeters per minute.The carbon bore that generates heat is Φ 190mm, and fever carbon tube resistor rate is 9 × 10-6 Ω
m；Cold end carbon tube resistor rate is 6 × 10-6 Ω m, and siliconising power is 110kw, fills metal silicon material in cold end inner hole, weighs up
After weight, green compact are buried with silicon grain, one layer of cold end casing, one layer of silicon grain, last top spreads one layer of silicon grain.These materials are all
In graphite boat.The granularity of metallic silicon is 1-3 millimeters, and chemical equation is C+si=sic.Reaction time is 170 points
Clock, siliconising are completed.
Heater and cold end bonding is integral, bonding Elema is then put into drying box, is dried 14 small
When.Elema after drying is put into soldering furnace and is welded, welding temperature is 1700 DEG C or so.
The invention has the advantages that blank density is uniform, green body will not longitudinal cracking.The bonding agent performance of selection is good, will not
Occur because rub it is excessive due to cause crackle the problem of.
In addition the process recrystallized is that fine grained evaporation-condensation is in coarse grained engaging portion under high temperature, by thick in green body
Grain crystal combination together, forms an entirety.Temperature is excessively high to will lead to silicon carbide decomposition, if firing temperature is low to will cause knot
Crystalline substance is few, will lead to Elema aging quickening, the lost of life in this way.
The resistivity of cold end part of silicon carbide rod is in 18-24 Ω mm2/ m, the specific resistance after connecting heater are 12:1---15:1.
Power of the consumption in cold end in this way is considerably less, and most of energy concentrates on heating part, is conducive to the promotion of furnace temperature, non-
Chang Jieneng can greatly improve the service life of heater, reduce the production cost of client.
Specific embodiment:
Make the raw material and weight ratio of heater are as follows: F24 silicon carbide 10kg, F36 silicon carbide 6.2kg, F46 silicon carbide 2.8kg,
F60 silicon carbide 7kg, F80 silicon carbide 7kg, 100F silicon carbide 10.5kg, 5S silicon carbide 12kg, D3E silicon carbide 7.5kg；
The raw material and weight ratio of bonding agent are as follows: methylcellulose 0.8kg, polyvinyl alcohol 0.8kg, glycerol 1kg, pure water are
4.2kg；
F24 silicon carbide 10kg, 5S silicon carbide 12kg is first dry-mixed in V-type mixing pot, and mixing moves back in round mixing pot,
In round mixing pot with F36 silicon carbide 6.2kg, F46 silicon carbide 2.8kg, F60 silicon carbide 7kg, F80 silicon carbide 7kg, 100F carbon
SiClx 10.5kg, D3E silicon carbide 7.5kg is dry-mixed, finally add methylcellulose 0.8kg, polyvinyl alcohol 0.8kg, glycerol 1kg,
Pure water 4.2kg carries out wet mixing；
Mixing pot must be white steel material, and avoiding impurity from being mixed into influences Elema performance.It the use of the purpose of pure water is also to avoid drawing
Enter impurity, bonding agent can generate preferable interface cohesion with silicon-carbide particle surface.Reducing friction helps particle in forming process
Middle rearrangement, makes blank Densification.
Uniformly mixed material is put into hard plastic extrusion molding in press, briquetting pressure is between 18-20Mpa；
Then it is dried, heater drying is exactly the process for being dehydrated plastic removal, and natural drying and drying box is divided to dry two steps, green compact
It dries 2-3 days, the green compact after natural drying are put into drying box drying, and 170 DEG C of drying temperature, drying time is 40 hours.
The heater after drying is burnt into carbon shirt-circuiting furnace, the process as recrystallized, recrystallization temperature is 2450 DEG C.
Production cold end part of silicon carbide rod uses methylcellulose and polyvinyl alcohol as bonding agent；
Powder is carborundum powder (180 mesh), graphite powder (200 mesh), wood powder (60 mesh), water；
The weight ratio of each raw material are as follows: methylcellulose 2kg, polyvinyl alcohol 2kg, carborundum powder 52kg, graphite powder 40kg, wood powder
4kg, water 20kg.
Various raw materials are mixed in mixing pot in the ratio first, mixing can form after forty minutes, with 300 tons
Four-column hydraulic press extrusion forming, green compact after molding are first dried 48 hours, are then dried in drying box 10 hours, drying temperature
Degree is 170 DEG C, keeps the temperature 4 hours again under the conditions of 170 DEG C, so that it may siliconising.Siliconising use metallic silicon model be
" 441 ", the equipment used are the carbon shirt-circuiting furnace of nitrogen protection, and the weight of metallic silicon is 1.2 times of green compact weight, and siliconising temperature is
1850 DEG C, fltting speed is 20 millimeters per minute.The carbon bore that generates heat is Φ 190mm, and fever carbon tube resistor rate is 9 × 10-6 Ω
m；Cold end carbon tube resistor rate is 6 × 10-6 Ω m, and siliconising power is 110kw, fills metal silicon material in cold end inner hole, weighs up
After weight, green compact are buried with silicon grain, one layer of cold end casing, one layer of silicon grain, last top spreads one layer of silicon grain.These materials are all
In graphite boat.The granularity of metallic silicon is 1-3 millimeters, and chemical equation is C+si=sic.Reaction time is 170 points
Clock, siliconising are completed.
Heater and cold end bonding is integral, bonding Elema is then put into drying box, is dried 14 small
When.Elema after drying is put into soldering furnace and is welded, welding temperature is 1700 DEG C or so.
Claims (1)
1. a kind of production technology of U-shaped Elema, it is characterized in that:
Make the raw material and weight ratio of heater are as follows: F24 silicon carbide 10kg, F36 silicon carbide 6.2kg, F46 silicon carbide 2.8kg,
F60 silicon carbide 7kg, F80 silicon carbide 7kg, 100F silicon carbide 10.5kg, 5S silicon carbide 12kg, D3E silicon carbide 7.5kg；
The raw material and weight ratio of bonding agent are as follows: methylcellulose 0.8kg, polyvinyl alcohol 0.8kg, glycerol 1kg, pure water are
4.2kg；
F24 silicon carbide 10kg, 5S silicon carbide 12kg is first dry-mixed in V-type mixing pot, and mixing moves back in round mixing pot,
In round mixing pot with F36 silicon carbide 6.2kg, F46 silicon carbide 2.8kg, F60 silicon carbide 7kg, F80 silicon carbide 7kg, 100F carbon
SiClx 10.5kg, D3E silicon carbide 7.5kg is dry-mixed, finally add methylcellulose 0.8kg, polyvinyl alcohol 0.8kg, glycerol 1kg,
Pure water 4.2kg carries out wet mixing；
Uniformly mixed material is put into hard plastic extrusion molding in press, briquetting pressure is between 18-20Mpa；
Then it is dried, heater drying is exactly the process for being dehydrated plastic removal, and natural drying and drying box is divided to dry two steps, green compact
It dries 2-3 days, the green compact after natural drying are put into drying box drying, and 170 DEG C of drying temperature, drying time is 40 hours；
The heater after drying is burnt into carbon shirt-circuiting furnace, the process as recrystallized, recrystallization temperature is 2450 DEG C；
Production cold end part of silicon carbide rod uses methylcellulose and polyvinyl alcohol as bonding agent；
Powder is carborundum powder (180 mesh), graphite powder (200 mesh), wood powder (60 mesh), water；
The weight ratio of each raw material are as follows: methylcellulose 2kg, polyvinyl alcohol 2kg, carborundum powder 52kg, graphite powder 40kg, wood powder
4kg, water 20kg；
Various raw materials are mixed in mixing pot in the ratio first, hydraulic press extrusion forming, molding are used in mixing after forty minutes
Green compact afterwards first dry 48 hours, then dry in drying box 10 hours, and drying temperature is 170 DEG C, under the conditions of 170 DEG C
4 hours are kept the temperature again, so that it may which siliconising, the weight of metallic silicon are 1.2 times of green compact weight, and siliconising temperature is 1850 DEG C, hair
Hot carbon tube resistor rate is 9 × 10-6 Ω m；Cold end carbon tube resistor rate is 6 × 10-6 Ω m, and siliconising power is 110kw, in cold end
Portion's inner hole fills metal silicon material, and after weighing up weight, green compact are buried with silicon grain, one layer of cold end casing, one layer of silicon grain, finally on
Side's one layer of silicon grain of paving；These materials are incorporated into graphite boat, and the granularity of metallic silicon is 1-3 millimeters, and the reaction time is 170 minutes,
Siliconising is completed；
Heater and cold end bonding is integral, bonding Elema is then put into drying box, is dried 14 hours, it will
Elema after drying, which is put into soldering furnace, to be welded, and welding temperature is 1700 DEG C or so.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810989045.4A CN109180190A (en) | 2018-08-28 | 2018-08-28 | A kind of production technology of U-shaped Elema |
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| CN201810989045.4A CN109180190A (en) | 2018-08-28 | 2018-08-28 | A kind of production technology of U-shaped Elema |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1994968A (en) * | 2006-12-15 | 2007-07-11 | 湖南大学 | Preparation technology for recrystallizing carborundum product |
| CN103449817A (en) * | 2012-05-30 | 2013-12-18 | 辽阳宏图碳化物有限公司 | Cold end of silicon carbide rod and production method thereof |
| CN104602371A (en) * | 2015-01-28 | 2015-05-06 | 周献 | Composite silicon carbide electrical heating element and production method thereof |
| CN105837217A (en) * | 2016-03-24 | 2016-08-10 | 山东奥昱翔碳化硅科技有限公司 | Silicon carbide rod and preparation method thereof |
-
2018
- 2018-08-28 CN CN201810989045.4A patent/CN109180190A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1994968A (en) * | 2006-12-15 | 2007-07-11 | 湖南大学 | Preparation technology for recrystallizing carborundum product |
| CN103449817A (en) * | 2012-05-30 | 2013-12-18 | 辽阳宏图碳化物有限公司 | Cold end of silicon carbide rod and production method thereof |
| CN104602371A (en) * | 2015-01-28 | 2015-05-06 | 周献 | Composite silicon carbide electrical heating element and production method thereof |
| CN105837217A (en) * | 2016-03-24 | 2016-08-10 | 山东奥昱翔碳化硅科技有限公司 | Silicon carbide rod and preparation method thereof |
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Application publication date: 20190111 |