CN1838841A - Composite high temperature electrical heating element and its making method - Google Patents
Composite high temperature electrical heating element and its making method Download PDFInfo
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- CN1838841A CN1838841A CN 200510200833 CN200510200833A CN1838841A CN 1838841 A CN1838841 A CN 1838841A CN 200510200833 CN200510200833 CN 200510200833 CN 200510200833 A CN200510200833 A CN 200510200833A CN 1838841 A CN1838841 A CN 1838841A
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Abstract
The invention relates to a composite high-temperature electric heating element and relative producing method, which is formed by graphite, carbon silicon and molybdenum silicide. Wherein, the graphite is used as basis layer, which is coated with carbon silicon layer to be coated with molybdenum silicide layer. The invention uses the high-temperature solid reaction disperse method to composite three materials, to realize the continuous gradient change from inner to outer. The invention has lower cost, less high-temperature creep, high high-temperature strengthen, and the application for high-temperature oxide area.
Description
Technical field:
The present invention relates to a kind of composite high temperature electrical heating element and preparation method thereof, belong to the electrical heating element technical field.
Background technology:
At present, the electrical heating elements of a large amount of uses in 1500-1600 ℃ of high temperature oxidation stability atmosphere mainly are the molybdenum disilicide rods of molybdenum disilicide material in the existing industry, but the molybdenum disilicide rod is expensive economically, and exists under low-temperature oxidation district (400-800 ℃) and the high temperature creep bigger; Heater element can be elongated the shortcoming of drawing-down owing to own wt; And carborundum electrical heating element maximum operation (service) temperature in oxidizing atmosphere can only arrive 1350 ℃, is higher than 1350 ℃ of carborundum electrical heating element oxidation aggravations.The elevated temperature strength of graphite electrical heating element is better, and electric heating property is stable, but can only use in inert gas or reducing atmosphere, can not use in air.Therefore, the result of use of electrical heating element of the prior art is desirable not enough.
Summary of the invention:
The objective of the invention is: provide that a kind of cost is lower, high-temerature creep is less, elevated temperature strength is higher and be applicable to composite high temperature electrical heating element of high-temperature work environment and preparation method thereof, to overcome the deficiencies in the prior art.
Composite high temperature electrical heating element of the present invention is to constitute like this: it is by graphite, carborundum and the compound electrical heating element of forming of three kinds of materials of molybdenum disilicide, and promptly this electrical heating element is by the electrical heating element of the compound cylinder clavate of forming of graphite, carborundum and three kinds of materials of molybdenum disilicide, vertical bar formula rectangle, annular or board-like shape.
The manufacture method of composite high temperature electrical heating element of the present invention is: with the compound composition electrical heating element of graphite, carborundum and three kinds of materials of molybdenum disilicide the time, with graphite as basal layer, cover silicon carbide layer on the graphite basal layer earlier, and then covering molybdenum disilicide layer on the silicon carbide layer.
The graphite basal layer that is coated with silicon carbide layer earlier after 0.5～2 hour, is being covered molybdenum disilicide layer through 1300 ℃～1600 ℃ temperature sintering again on the silicon carbide layer, then with it together through 1800 ℃～2000 ℃ temperature sintering 0.5～2 hour.
When covering silicon carbide layer on the graphite basal layer and cover molybdenum disilicide layer on silicon carbide layer, the carborundum of its silicon carbide layer and molybdenum disilicide layer and molybdenum disilicide are Powdered more than or equal to 300 purposes.
When on the graphite basal layer, covering silicon carbide layer, earlier the graphite basal layer is heated to 1400～1600 ℃, and then graphite basal layer after will heating and silicon-containing gas haptoreaction, can on the graphite basal layer, produce silicon carbide layer like this, cover on the silicon carbide layer with the above molybdenum silicide powder spraying of 300 orders or 300 orders then and through 1800 ℃～2000 ℃ temperature sintering 0.5～2 hour.
Graphite can be modified graphite.
Since adopted method that technique scheme, the present invention adopt high temperature solid state reaction diffusion with graphite (or modified graphite), carborundum, three kinds of materials of molybdenum disilicide one by one successively continuous gradient change the electrical heating element that is composited.Because this compound electrical heating element has realized that at composition and tissue graphite (or modified graphite), carborundum, the compound continuous gradient of molybdenum disilicide change, thereby overcome the internal stress that various storerooms cause owing to the difference of the coefficient of expansion, make between different materials in conjunction with firm, incrust, cracking.Compound electrical heating element of the present invention is that the continuous gradient of realizing graphite (or modified graphite), carborundum, molybdenum disilicide from the inside to surface one by one changes, not only make various storerooms in conjunction with good, made full use of simultaneously the advantage of three kinds of electric heating materials again, thereby make this electrical heating element can under 1500-1600 ℃ high temperature, stablize use for a long time, and its cost is significantly less than molybdenum disilicide.Therefore, the present invention compared with prior art, the present invention has the advantage that cost is low, high-temerature creep is little, elevated temperature strength is high and be applicable to the high temperature oxidation stability atmosphere.
Description of drawings:
Accompanying drawing 1 structural representation during for the compound electrical heating element produced with combination of the present invention;
Accompanying drawing 2 is the compound electrical heating element of a change diameter cylinder clavate of the present invention structural representation in use;
Accompanying drawing 3 is the compound electrical heating element of an equal diameter cylinder clavate of the present invention structural representation in use;
Accompanying drawing 4 is a U word annular compound electrical heating element of the present invention structural representation in use.
In the accompanying drawings: 1 is that graphite basal layer, 2 is that silicon carbide layer, 3 is that molybdenum disilicide layer, 4 cold junctions that are connected with power line in use for compound electrical heating element of the present invention, 5 are the compound electrical heating element of the present invention thermal treatment zone in use.
Embodiment:
Embodiments of the invention 1: with graphite (or modified graphite), during the compound composition electrical heating element of three kinds of materials of carborundum and molybdenum disilicide, with graphite (or modified graphite) as basal layer, the shape of basal layer can be able to be made into the cylinder clavate, vertical bar formula rectangle, annular or board-like shape, its size can be according to using needs to determine, on graphite (or modified graphite) basal layer, cover the silicon carbide layer of last layer 1～5 millimeters thick then, with the graphite basal layer that is coated with silicon carbide layer earlier through 1300 ℃～1600 ℃ temperature sintering after 0.5～2 hour, on silicon carbide layer, cover the molybdenum disilicide layer of last layer 1～5 millimeters thick again, then with it together through 1800 ℃～2000 ℃ temperature sintering after 0.5～2 hour.When covering silicon carbide layer on the graphite basal layer and cover molybdenum disilicide layer on silicon carbide layer, the carborundum of its silicon carbide layer and molybdenum disilicide layer and molybdenum disilicide are Powdered more than or equal to 300 purposes.
Embodiments of the invention 2: with graphite (or modified graphite), during the compound composition electrical heating element of three kinds of materials of carborundum and molybdenum disilicide, with graphite (or modified graphite) as basal layer, the shape of basal layer can be able to be made into the cylinder clavate, vertical bar formula rectangle, annular or board-like shape, its size can be according to using needs to determine, when on graphite (or modified graphite) basal layer, covering silicon carbide layer, earlier graphite (or modified graphite) basal layer is heated to 1400～1600 ℃, and then graphite basal layer after will heating and silicon-containing gas haptoreaction, can on the graphite basal layer, produce the silicon carbide layer of one deck 1～2 millimeters thick like this, cover the molybdenum disilicide layer that makes it to form one deck 1～5 millimeters thick on this silicon carbide layer with the above molybdenum silicide powder spraying of 300 orders or 300 orders then, and with it through 1800 ℃～2000 ℃ temperature sintering after 0.5～2 hour.
Embodiments of the invention 3: with graphite (or modified graphite), during the compound composition electrical heating element of three kinds of materials of carborundum and molybdenum disilicide, with graphite (or modified graphite) as basal layer, the shape of basal layer can be able to be made into the cylinder clavate, vertical bar formula rectangle, annular or board-like shape, its size can be according to using needs to determine, on graphite (or modified graphite) basal layer, cover the silicon carbide layer of last layer 1～5 millimeters thick with 300 orders or the silicon carbide powder more than 300 orders, and then covering usefulness 300 orders of last layer 1～5 millimeters thick or the molybdenum disilicide layer more than 300 orders on the silicon carbide layer with the molybdenum silicide powder making, after pressure forming, again with it through 1800 ℃～2000 ℃ temperature sintering 0.5～2 hour.
Use when of the present invention, earlier be installed in compound electrical heating element of the present invention on the device of required use by instructions for use, and after anchor clamps (head) electrode that will be connected with power line in the usual way is connected on the compound electrical heating element cold junction of the present invention, the use of can switching on.
Claims (7)
1. composite high temperature electrical heating element, it is characterized in that: it is by graphite, carborundum and the compound electrical heating element of forming of three kinds of materials of molybdenum disilicide.
2. composite high temperature electrical heating element according to claim 1 is characterized in that: this electrical heating element is by the electrical heating element of the compound cylinder clavate of forming of graphite, carborundum and three kinds of materials of molybdenum disilicide, vertical bar formula rectangle, annular or board-like shape.
3. the manufacture method of a composite high temperature electrical heating element, it is characterized in that: the time the compound composition electrical heating element of graphite, carborundum and three kinds of materials of molybdenum disilicide, with graphite as basal layer, cover silicon carbide layer on the graphite basal layer earlier, and then covering molybdenum disilicide layer on the silicon carbide layer.
4. the manufacture method of composite high temperature electrical heating element according to claim 3, it is characterized in that: the graphite basal layer that will be coated with silicon carbide layer is earlier through 1300 ℃～1600 ℃ temperature sintering after 0.5～2 hour, covering molybdenum disilicide layer on the silicon carbide layer again, then with it together through 1800 ℃～2000 ℃ temperature sintering 0.5～2 hour.
5. the manufacture method of composite high temperature electrical heating element according to claim 4, it is characterized in that: when covering silicon carbide layer on the graphite basal layer and cover molybdenum disilicide layer on silicon carbide layer, the carborundum of its silicon carbide layer and molybdenum disilicide layer and molybdenum disilicide are Powdered more than or equal to 300 purposes.
6. the manufacture method of composite high temperature electrical heating element according to claim 3, it is characterized in that: when on the graphite basal layer, covering silicon carbide layer, earlier the graphite basal layer is heated to 1400～1600 ℃, and then graphite basal layer after will heating and silicon-containing gas haptoreaction, can on the graphite basal layer, produce silicon carbide layer like this, cover on the silicon carbide layer with the above molybdenum silicide powder spraying of 300 orders or 300 orders then and through 1800 ℃～2000 ℃ temperature sintering 0.5～2 hour.
7. according to the manufacture method of described composite high temperature electrical heating element one of among the claim 3-6, it is characterized in that: graphite can be modified graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102008333A CN100536623C (en) | 2005-12-19 | 2005-12-19 | Composite high temperature electrical heating element and its making method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102008333A CN100536623C (en) | 2005-12-19 | 2005-12-19 | Composite high temperature electrical heating element and its making method |
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| CN1838841A true CN1838841A (en) | 2006-09-27 |
| CN100536623C CN100536623C (en) | 2009-09-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100518415C (en) * | 2006-12-27 | 2009-07-22 | 中国科学院金属研究所 | Heating unit of infrared electric heating plate and producing method |
| CN103796346A (en) * | 2014-02-27 | 2014-05-14 | 上海理工大学 | High-temperature nano-electrothermal film of double-film structure and preparation method thereof |
| CN105674753A (en) * | 2016-01-19 | 2016-06-15 | 山东圣川陶瓷材料有限公司 | Preparation method for graphite sandwich composite silicon carbide burning bearing plate |
| CN108601116A (en) * | 2018-06-12 | 2018-09-28 | 广东省新材料研究所 | A kind of MoSi2 bases electro-thermal coatings heating roller and preparation method thereof |
-
2005
- 2005-12-19 CN CNB2005102008333A patent/CN100536623C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100518415C (en) * | 2006-12-27 | 2009-07-22 | 中国科学院金属研究所 | Heating unit of infrared electric heating plate and producing method |
| CN103796346A (en) * | 2014-02-27 | 2014-05-14 | 上海理工大学 | High-temperature nano-electrothermal film of double-film structure and preparation method thereof |
| CN105674753A (en) * | 2016-01-19 | 2016-06-15 | 山东圣川陶瓷材料有限公司 | Preparation method for graphite sandwich composite silicon carbide burning bearing plate |
| CN105674753B (en) * | 2016-01-19 | 2018-06-15 | 山东圣川陶瓷材料有限公司 | The preparation method of the sandwich complex silicon carbide load bearing board of graphite |
| CN108601116A (en) * | 2018-06-12 | 2018-09-28 | 广东省新材料研究所 | A kind of MoSi2 bases electro-thermal coatings heating roller and preparation method thereof |
| CN108601116B (en) * | 2018-06-12 | 2020-12-18 | 广东省新材料研究所 | MoSi 2-based electrothermal coating heating roller and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN100536623C (en) | 2009-09-02 |
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