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Composite high temperature electrical heating element and its making method

A manufacturing method and electric heating technology, applied in the direction of electrical elements, heating element materials, heating element shapes, etc., can solve the problem of unsatisfactory use effect of electric heating elements, elongation and thinning of the heating element itself, intensified oxidation of electric heating elements, etc. problems, to achieve the effect of low cost, low high temperature creep, and not easy to peel off

Inactive Publication Date: 2009-09-02
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the electric heating element widely used in the existing industry in a high-temperature oxidizing atmosphere at 1500-1600°C is mainly a molybdenum disilicide rod made of molybdenum disilicide material, but the molybdenum disilicide rod is economically expensive and has a low-temperature oxidation zone (400-800°C) and large creep at high temperature; the heating element will be elongated and thinned due to its own weight; and the maximum operating temperature of silicon carbide electric heating elements can only reach 1350°C in an oxidizing atmosphere, high Oxidation of silicon carbide electric heating element intensified at 1350°C
The high-temperature strength of graphite electric heating element is good, and the electric heating performance is stable, but it can only be used in inert gas or reducing atmosphere, and cannot be used in air
Therefore, the use effect of the electric heating element in the prior art is not ideal enough

Method used

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  • Composite high temperature electrical heating element and its making method
  • Composite high temperature electrical heating element and its making method
  • Composite high temperature electrical heating element and its making method

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Embodiment 1

[0016] Embodiment 1 of the present invention: when graphite (or modified graphite), silicon carbide and molybdenum disilicide are combined to form an electric heating element, graphite (or modified graphite) is used as the base layer, and the shape of the base layer It can be made into a cylindrical rod shape, a straight rectangular shape, a ring shape or a plate shape, and its size can be determined according to the needs of use, and then a layer of silicon carbide with a thickness of 1 to 5 mm is covered on the base layer of graphite (or modified graphite) layer, the graphite base layer covered with the silicon carbide layer is first sintered at a temperature of 1300°C to 1600°C for 0.5 to 2 hours, and then the silicon carbide layer is covered with a layer of molybdenum disilicide layer with a thickness of 1 to 5 mm, and then Sinter them together at a temperature of 1800°C to 2000°C for 0.5 to 2 hours. When the silicon carbide layer is covered on the graphite base layer and ...

Embodiment 2

[0017] Embodiment 2 of the present invention: when graphite (or modified graphite), silicon carbide and molybdenum disilicide are combined to form an electric heating element, graphite (or modified graphite) is used as the base layer, and the shape of the base layer can be adjusted. It can be made into a cylindrical rod shape, a straight rectangle, a ring or a plate shape, and its size can be determined according to the needs of the use. When covering the silicon carbide layer on the graphite (or modified graphite) base layer, the graphite (or modified graphite) Graphite) base layer is heated to 1400-1600 ° C, and then the heated graphite base layer is contacted with silicon-containing gas to react, so that a layer of 1-2 mm thick silicon carbide layer can be produced on the graphite base layer, and then use Molybdenum disilicide powder of 300 mesh or more is sprayed and covered on the silicon carbide layer to form a layer of molybdenum disilicide layer with a thickness of 1 to...

Embodiment 3

[0018] Embodiment 3 of the present invention: when graphite (or modified graphite), silicon carbide and molybdenum disilicide are combined to form an electric heating element, graphite (or modified graphite) is used as the base layer, and the shape of the base layer can be adjusted. It can be made into a cylindrical rod shape, a straight rectangular shape, a ring shape or a plate shape, and its size can be determined according to the needs of the use. Cover the graphite (or modified graphite) base layer with silicon carbide powder of 300 mesh or more A layer of 1-5 mm thick silicon carbide layer, and then cover the silicon carbide layer with a layer of 1-5 mm thick molybdenum disilicide layer made of molybdenum disilicide powder with a thickness of 300 mesh or more. After pressure molding, it is then sintered at a temperature of 1800°C to 2000°C for 0.5 to 2 hours.

[0019] When using the present invention, first the composite electric heating element of the present invention ...

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Abstract

The invention discloses a composite high-temperature electric heating element and a manufacturing method thereof. It is an electric heating element composed of three materials: graphite, silicon carbide and molybdenum disilicide; When compositing electric heating elements, graphite is used as the base layer, and the silicon carbide layer is first covered on the graphite base layer, and then the molybdenum disilicide layer is covered on the silicon carbide layer. The present invention adopts the method of high-temperature solid-phase reaction diffusion to combine graphite (or modified graphite), silicon carbide, and molybdenum disilicide layer by layer with continuous gradient changes to form an electric heating element. The continuous gradient change of , silicon carbide and molybdenum disilicide not only makes the combination of various materials good, but also makes full use of the advantages of the three electric heating materials. The invention has the advantages of low cost, small high temperature creep, high high temperature strength and is suitable for high temperature oxidizing atmosphere environment.

Description

Technical field: [0001] The invention relates to a composite high-temperature electric heating element and a manufacturing method thereof, belonging to the technical field of electric heating elements. Background technique: [0002] At present, the electric heating element widely used in the existing industry in a high-temperature oxidizing atmosphere at 1500-1600°C is mainly a molybdenum disilicide rod made of molybdenum disilicide material, but the molybdenum disilicide rod is economically expensive and has a low-temperature oxidation zone (400-800°C) and large creep at high temperature; the heating element will be elongated and thinned due to its own weight; and the maximum operating temperature of silicon carbide electric heating elements can only reach 1350°C in an oxidizing atmosphere, high The oxidation of silicon carbide electric heating elements intensifies at 1350°C. Graphite electric heating elements have good high-temperature strength and stable electric heating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/12H05B3/20H05B3/40
Inventor 张藜
Owner GUIYANG AL-MG DESIGN & RES INST
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