CN103152847A - Method for manufacturing lanthanum chromite electric heating element in welding manner - Google Patents
Method for manufacturing lanthanum chromite electric heating element in welding manner Download PDFInfo
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- CN103152847A CN103152847A CN2013100633442A CN201310063344A CN103152847A CN 103152847 A CN103152847 A CN 103152847A CN 2013100633442 A CN2013100633442 A CN 2013100633442A CN 201310063344 A CN201310063344 A CN 201310063344A CN 103152847 A CN103152847 A CN 103152847A
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- lanthanum chromite
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Abstract
The invention relates to a method for manufacturing a lanthanum chromite electric heating element in a welding manner. The method is characterized by comprising the following steps of: respectively manufacturing blanks of a heating side material and a cold side material of the lanthanum chromite electric heating element, machining, cutting and sintering the blanks to prepare the heating side material and the cold side material, and welding the heating side material and the cold side material to obtain the lanthanum chromite electric heating element product with a required specification. The method disclosed by the invention has the advantages that the lanthanum chromite electric heating element can be industrially produced and is short in production peroid and low in cost; the method disclosed by the invention can be used for producing straight or specially-shaped electric heating elements with any lengths, and the use scope of the traditional lanthanum chromite electric heating element is greatly broadened; and the lanthanum chromite electric heating element manufactured by using the method is good in appearance, stable in quality and resistance to corrosion, the life of the lanthanum chromite electric heating element when being used at a temperature ranging from room temperature to 1800 DEG C is more than 2000 hours, and the lanthanum chromite electric heating element can be used in various electric furnaces for completely replacing the traditional electric heating element.
Description
Technical field
The present invention relates to a kind of method for preparing the Lanthanum Chromite electric heating element by welding, belong to the electric heating element field.
Background technology
The Lanthanum Chromite electric heating element is a kind of non-metal electric heating element, and kind only has thick end type and equal diameter type at present, and the thick end type is replaced by the equal diameter type fully.Provided a kind of preparation method of Lanthanum Chromite electric heating element in the Chinese patent of the patent No.: ZL02102689.0 " superhigh temperature electrothermal ceramic heating body manufacture method ", the method adopts integral sintered technique to prepare the Lanthanum Chromite electric heating element, its shortcoming be grow the production cycle, yield poorly, cost is high, product is single, be unsuitable for production length at the Lanthanum Chromite electric heating element more than 1 meter and special-shaped electric heating element, can't form suitability for industrialized production.
Summary of the invention
The purpose of this invention is to provide a kind of segmentation welding procedure, can make random length straight type and special-shaped electric heating element, with short production cycle, cost is low, can form suitability for industrialized production prepare the method for Lanthanum Chromite electric heating element by welding.
The objective of the invention is to realize in the following manner:
A kind of method for preparing the Lanthanum Chromite electric heating element by welding of the present invention, its processing step is:
Step 1: prepare respectively the heating end of Lanthanum Chromite electric heating element, the powder of cold junction material;
Step 2: the heating end that obtains in step 1, the powder of cold junction material are dry mixed respectively mixing, powder and plasticizer aqueous solution are rolled through stirring, plasticizer is evenly distributed, plasticity increases, and makes respectively the blank of heating end, cold junction;
Step 3: with heating end, the pre-extruding twice on hydraulic press respectively of cold junction blank that obtains in step 2, further increase the cohesive force of blank, and it is standby to be pressed into required form;
Step 4: go out cylindrical shape molding blank, Cutting Length as required with the blank of each heating end, cold junction is continuously extruded on screw extruder or piston extruder respectively according to the required diameter specification;
Step 5: the base substrate after cutting is in the room temperature standing and drying more than 24 hours;
Step 6: dried base substrate is put into kiln sintering set out hot junction, cold junction material;
Step 7: the heating end after burning till, cold junction material obtain the Lanthanum Chromite electric heating element product of required specification by welding;
Step 8: the rear conducting end at element of cleaning is coated with silver and is convenient to wiring.
Described heating end in step 1, the powder of cold junction material are by the patent No.: the superhigh temperature electrothermal ceramic heating body manufacture method of ZL02102689.0 prepares, and the granularity of powder is 1～100 μ m;
Described plasticizer is that mass percent concentration is the cellulosic aqueous solution of 1%-10%;
Described cellulose is methylcellulose, ethyl cellulose, one or more in carboxycellulose;
The consumption of plasticizer is the 1%-50%(mass percent);
Pre-squeeze pressure described in step 3 is 20-40Mpa;
Extrusion modling pressure described in step 4 is 20-80Mpa;
The base wall thickness of the cylindrical shape molding blank described in step 4 is 1～10 millimeter, and the base substrate external diameter is 10～200 millimeters;
The sintering atmosphere of described step 6 is atmosphere or protective gas, and sintering schedule is 1-24 hour, 1000～1800 ℃ insulations of 200～600 ℃ of insulations 1～50 hour;
Be welded as girth welding described in step 7, the thermal source of girth welding mode comprises arc welding, plasma arc welding (PAW), Laser Welding, submerged-arc welding, gas welding, and welding temperature is 1000～3000 ℃.
Advantage of the present invention is: the segmentation welding procedure with the Lanthanum Chromite material has replaced the integral sintered technique of past patent " superhigh temperature electrothermal ceramic heating body manufacture method " to prepare the Lanthanum Chromite electric heating element, can realize the suitability for industrialized production of Lanthanum Chromite electric heating element, with short production cycle, cost is low; Use the present invention can produce as required straight type and the special-shaped battery thermal element that comprises random length, greatly expanded the scope of application of traditional chromic acid lanthanum electric heating element; The product appearance of producing by the present invention is good, and steady quality is corrosion-resistant, can use in room temperature to 1800 ℃ scope, and the life-span surpasses 2000 hours, can substitute the traditional ceramics electric heating element fully and use in all kinds of electric furnaces.
Description of drawings
Fig. 1 is the structural representation of the Lanthanum Chromite electric heating element in embodiment 1;
Fig. 2 is the structural representation of the Lanthanum Chromite electric heating element in embodiment 2;
Fig. 3 is the structural representation of the Lanthanum Chromite electric heating element in embodiment 3.
Embodiment
This electric heating element uses in room temperature to 1800 ℃ scope, can use continuously over 2000 hours.
This electric heating element uses in room temperature to 1800 ℃ scope, can use continuously over 2000 hours.
Embodiment 3
Accompanying drawing 3 is for adopting " mountain " type electric heating element of the inventive method preparation, and this element can connect three power supplys to be used.Wherein heating part is 1 meter by a segment length, and three segment lengths are that the hot junction of 0.3 meter consists of, external diameter 25mm, wall thickness 6mm.Terminals are that the cold junction of 0.3 meter consists of by 3 segment lengths, external diameter 25mm, and wall thickness 6mm, integral member is welded acquisition by mode in figure.Detailed process is for to produce required Lanthanum Chromite hot junction and cold junction material according to patent " superhigh temperature electrothermal ceramic heating body manufacture method ", afterwards powder and cellulose aqueous solution are stirred in machine and roll, the addition of cellulose aqueous solution is 40%wt, concentration 12%wt.To through stirring the blank pre-extruding twice on hydraulic press that rolls, the material that pushed be pressed into pie.Consider sintering shrinkage, the parameter of screw extruder is adjusted to external diameter 26mm, wall thickness 7mm, the hot junction Cutting Length is 0.35 meter and 1.05 meters, and the cold junction Cutting Length is 0.35 meter, and the blank that cuts is put into kiln after at room temperature standing 24 hours, sintering schedule is 200 ℃ of insulations 6 hours, 1700 ℃ are incubated 4 hours, and sintering atmosphere is atmospheric environment, and is cooling with stove afterwards.Cooling good hot junction and cold junction are partly welded on Welding machine of circumferential weld by figure, and welding heat source is acetylene torch, 3000 ℃ of welding temperatures, and then cold junction is welded on the hot junction, welding temperature is the same.
This electric heating element uses in room temperature to 1800 ℃ scope, can use continuously over 2000 hours.
Claims (9)
1. method for preparing the Lanthanum Chromite electric heating element by welding, it is characterized in that: its processing step is:
Step 1: prepare respectively the heating end of Lanthanum Chromite electric heating element, the powder of cold junction material;
Step 2: the heating end that obtains in step 1, the powder of cold junction material are dry mixed respectively mixing, powder and plasticizer aqueous solution are rolled through stirring, plasticizer is evenly distributed, plasticity increases, and makes respectively the blank of heating end, cold junction;
Step 3: with heating end, the pre-extruding twice on hydraulic press respectively of cold junction blank that obtains in step 2, further increase the cohesive force of blank, and it is standby to be pressed into required form;
Step 4: go out cylindrical shape molding blank, Cutting Length as required with the blank of each heating end, cold junction is continuously extruded on screw extruder or piston extruder respectively according to the required diameter specification;
Step 5: the base substrate after cutting is in the room temperature standing and drying more than 24 hours;
Step 6: dried base substrate is put into kiln sintering set out hot junction, cold junction material;
Step 7: the heating end after burning till, cold junction material obtain the Lanthanum Chromite electric heating element product of required specification by welding.
2. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 1, it is characterized in that: the granularity of the described heating end in step 1, the powder of cold junction material is 1～100 μ m.
3. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 1, it is characterized in that: described plasticizer is that mass percent concentration is the cellulosic aqueous solution of 1%-10%.
4. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 3, it is characterized in that: described cellulose is methylcellulose, ethyl cellulose, one or more in carboxycellulose;
The consumption of plasticizer is the 1%-50%(mass percent).
5. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 1, it is characterized in that: the pre-squeeze pressure described in step 3 is 20-40Mpa.
6. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 1, it is characterized in that: the extrusion modling pressure described in step 4 is 20-80Mpa.
7. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 1, it is characterized in that: the base wall thickness of the cylindrical shape molding blank described in step 4 is 1～10 millimeter, the base substrate external diameter is 10～200 millimeters.
8. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 1; it is characterized in that: the sintering atmosphere of described step 6 is atmosphere or protective gas, and sintering schedule is 1-24 hour, 1000～1800 ℃ insulations of 200～600 ℃ of insulations 1～50 hour.
9. the method for preparing the Lanthanum Chromite electric heating element by welding according to claim 1, it is characterized in that: be welded as girth welding described in step 7, the thermal source of girth welding mode comprises arc welding, plasma arc welding (PAW), Laser Welding, submerged-arc welding, gas welding, and welding temperature is 1000～3000 ℃.
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| CN2013100633442A CN103152847A (en) | 2013-02-28 | 2013-02-28 | Method for manufacturing lanthanum chromite electric heating element in welding manner |
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| CN2013100633442A CN103152847A (en) | 2013-02-28 | 2013-02-28 | Method for manufacturing lanthanum chromite electric heating element in welding manner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378381A (en) * | 2018-10-19 | 2019-02-22 | 包头稀土研究院 | High temperature thermoelectric unit and its manufacturing method |
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| JP2002151235A (en) * | 2000-11-07 | 2002-05-24 | Ibiden Co Ltd | Manufacturing method of ceramic heater |
| CN1380809A (en) * | 2002-03-01 | 2002-11-20 | 包头稀土研究院 | Production method of ultra-high-temp. electrothermal ceramic heating body |
| CN1569740A (en) * | 2004-04-29 | 2005-01-26 | 西安交通大学 | Method for producing cold end part of silicon carbide heating element |
| UA72778C2 (en) * | 1999-12-06 | 2005-04-15 | Kanthal Ltd | Electric heating element, for example from silicon carbide |
| CN101765253A (en) * | 2010-02-02 | 2010-06-30 | 西安交通大学 | Method for preparing SiC heating element having long service life |
| CN101883450A (en) * | 2009-05-08 | 2010-11-10 | 陈建有 | High-temperature antioxidant silicon-molybdenum bar with strong toughness, and preparation method thereof |
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2013
- 2013-02-28 CN CN2013100633442A patent/CN103152847A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA72778C2 (en) * | 1999-12-06 | 2005-04-15 | Kanthal Ltd | Electric heating element, for example from silicon carbide |
| JP2002151235A (en) * | 2000-11-07 | 2002-05-24 | Ibiden Co Ltd | Manufacturing method of ceramic heater |
| CN1380809A (en) * | 2002-03-01 | 2002-11-20 | 包头稀土研究院 | Production method of ultra-high-temp. electrothermal ceramic heating body |
| CN1569740A (en) * | 2004-04-29 | 2005-01-26 | 西安交通大学 | Method for producing cold end part of silicon carbide heating element |
| CN101883450A (en) * | 2009-05-08 | 2010-11-10 | 陈建有 | High-temperature antioxidant silicon-molybdenum bar with strong toughness, and preparation method thereof |
| CN101765253A (en) * | 2010-02-02 | 2010-06-30 | 西安交通大学 | Method for preparing SiC heating element having long service life |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378381A (en) * | 2018-10-19 | 2019-02-22 | 包头稀土研究院 | High temperature thermoelectric unit and its manufacturing method |
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Application publication date: 20130612 |