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Composite electric heating carbon film and preparation method

A composite type, carbon film technology, applied in the direction of heating element materials, etc., can solve the problems of brittle ceramic electric heating film, practical application constraints, easy cracking and breaking, etc.

Inactive Publication Date: 2005-05-25
涂川俊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of semiconductor-type electric heating film is complicated, and special equipment such as vacuum coating is required, and the manufacturing cost is high, which limits its wide application; Curved surface electric heating elements, and their poor flexibility and adhesion make them severely restricted in practical application and cannot form industrialized production
Moreover, the ordinary electrothermal film is prone to oxidation after being used in the air for a period of time, and then hardens, becomes brittle, and is easy to crack and break, and the service life is short.

Method used

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  • Composite electric heating carbon film and preparation method
  • Composite electric heating carbon film and preparation method
  • Composite electric heating carbon film and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A composite electrothermal carbon membrane is an electrothermal carbon membrane with a layered composite structure. For its layered composite structure, see the attached figure 1 The two surfaces of the electrothermal carbon film 1 are respectively connected with the anti-oxidation protective coating 2 and the heat-resistant substrate 3, and the electrodes 4 are placed in the electrothermal carbon film 1.

[0018] The percentage value weight of electrothermal carbon film 1 composition is:

[0019] Flake graphite 61.5%

[0020] Carbon fiber 5.5%

[0021] Steel Fiber 8%

[0022] Phenolic resin 20%

[0023] Coal tar pitch 5%

[0024] Proper amount of acetone

[0025] Anti-oxidation protective coating 2 composition percentage value weight is:

[0026] Boron carbide 40%

[0027] Silicon carbide 37%

[0028] Silicon fume 20%

[0029] Aluminum phosphate 3%

[0030] Appropriate amount of water

[0031] The composition of the heat-resistant substrate 3 is refractory d...

Embodiment 2

[0034] A composite electrothermal carbon membrane is an electrothermal carbon membrane with a layered composite structure. For its layered composite structure, see the attached figure 2 , the surface of the electrothermal carbon film 1 is coated with an anti-oxidation protective coating 2, and the electrode 4 is placed in the electrothermal carbon film 1.

[0035] The percentage value weight of electrothermal carbon film 1 composition is:

[0036] Flake Graphite 80%

[0037] Carbon fiber 3%

[0038] Phenolic resin 12%

[0039] Polyvinyl acetal 2%

[0040] Zinc Stearate 3%

[0041] Proper amount of acetone

[0042] The percentage value weight of anti-oxidation protective coating composition is the same as embodiment 1

[0043] The preparation method is as follows: passing flake graphite through a 500-mesh sieve; fully dispersing carbon fiber in a solvent; dissolving polyvinyl acetal with a diluent, adding it to phenolic resin, stirring and dispersing to obtain modified p...

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Abstract

A composite electric heating carbon membrane contains heat resisting substrate, electric carbon membrane ,oxidation resisting protective coating, conductive electrode, wherein the electric carbon membrane consisting of scale graphite, carbon fiber, steel fiber, zinc stearate, phenolic resin, pioloform and acetone, oxidation resisting protective coating consisting of boron carbide, silicon carbide, silica fume, mini-aluminium phosphate and water. The preparation method contains painting, hot pressing, oxygen isolation charring and solidifying after spraying. The surface heating temperature can be high than 2000 deg.C.

Description

Technical field: [0001] The invention relates to a composite electric heating carbon film and a preparation method, belonging to the technical field of electric heating. Background technique: [0002] The traditional electric heating materials mainly include electric heating wire, electric heating rod and ordinary electric heating film. The thermal efficiency of the resistance wire is low when heating, which leads to the traditional electric heating material consumes a lot of power during the heating process and the surface heating temperature is not high. Ordinary electric heating films are usually divided into semiconductor electric heating films and ceramic electric heating films. The preparation process of semiconductor-type electric heating film is complicated, and special equipment such as vacuum coating is required, and the manufacturing cost is high, which limits its wide application; Curved-surface electric heating elements have poor flexibility and adhesion, which...

Claims

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Application Information

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IPC IPC(8): H05B3/14
Inventor 涂川俊夏金童
Owner 涂川俊
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