High temperature for infrared radiation electric heater of carbon material and its preparing method

A technology of far-infrared radiation and electric heating elements, applied in the direction of heating element materials, heating element shapes, etc., can solve the problems of low heating temperature and low service life

Inactive Publication Date: 2003-11-26
北京东方慧辰碳纤维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is based on the conductivity and far-infrared radiation performance of carbon fiber, to overcome the shortcomings of the existing heating element technology, such as low serv

Method used

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  • High temperature for infrared radiation electric heater of carbon material and its preparing method
  • High temperature for infrared radiation electric heater of carbon material and its preparing method

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Experimental program
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Embodiment 1

[0031]According to the design, the length of the quartz tube is 60 mm, and the diameter of the tube is 12 mm. The PANEX 33 carbon felt with a thickness of 5 mm produced by Zoltek in the United States is selected. The carbon content is 95.5%, the N content is 4.2%, the H content is 0.1%, and the S content is 0.1%, according to the cold resistivity of 60Ω.cm-1 and the hot resistivity of 45Ω.cm-1, the length is 53mm and the width is 8mm, and the resistor is vacuum-dried in a vacuum oven at 200°C After 2 hours, a nickel electrode wire coated with a silver conductive layer with a length of 10 mm was wound around both ends of the heating element, and a length of 60 mm was reserved for the electrode lead wire. After cleaning and drying the surface of the quartz tube, put it into the carbon fiber felt wrapped with the electrode lead wire, vacuumize, heat and dry, melt and seal the two ends at high temperature, open a small hole in the middle of the electric heating body to vacuum, and ...

Embodiment 3

[0035] 50% of PANEX 30 high-purity pulverized carbon fiber with a resistivity of 0.0014Ω.cm-1, 10% of 800-mesh high-purity conductive graphite and 20% of phenolic resin, 10% of mesophase pitch and 10% of solvent by weight ratio, Grind on a ball mill for 2 hours, and mold it on a hot press to form a plate of length×width×thickness: 100×8×5mm to obtain a carbon / graphite composite body with a certain geometric size, and heat up to 1500 at a rate of 10°C / min. ℃, under the protection of nitrogen, after carbonization at high temperature for 5 hours, under the protection of inert gas, the obtained resistor body was carbonized at high temperature. Its carbon content is detected to be 98.5%, the oxygen content is 0.004%, the resistivity of the resistor body is between 0.052Ω.cm-1, the oxidation rate in the air atmosphere is 0.04% / hour, and the resistance of the resulting heating element is 1.25Ω .Others are the same as in Example 2, the resistance of the obtained high-temperature far-i...

Embodiment 4

[0036] Process a quartz glass plate with a length × width × thickness of 1000 × 500 × 10mm, cut the carbon fiber felt to a size of 920 × 480 × 5mm, and the electrode is a tungsten metal sheet coated with a silver-containing conductive layer, and the size width × thickness is 3 × 1mm , wound on the carbon fiber felt that has added insulating quartz plate (thickness is 2mm), other process and method with embodiment 1. The resistance of the obtained heating plate is 25 Ω, and the power is 2000 watts when it is energized at 220 volts, the surface temperature of the high-temperature electric heating plate is 450° C., and the temperature of the heating element is 600° C.

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Abstract

This invention provides a high-temperature far infrared radiation electric heater of carbon material and its preparation method, among which its heating elements are made from one of carbon felts, carbon cloth, graphite felts, graphite cloth, carbon/carbon composite material sheets and carbon/graphite composite material sheets. The carbon content of its heating heating element is larger than 95%,oxygen content is lower than 0.005%, the resistivity is between (0.001-100) ohm cm, the outside of the electric heater insulator is coated with a ceramic film layer with far infrared radiation property. This invention also provides a preparation method for the high-temperature far infrared radiation electric heater.

Description

technical field [0001] The invention relates to an electric heating device and a preparation method thereof, in particular to a carbon material high-temperature far-infrared radiation electric heating body and a preparation method thereof. Background technique [0002] Traditional far-infrared heating elements generally use metal resistance wire, alloy wire, PTC electric heating film and other heating elements. Chinese patent CN 1050963C discloses a far-infrared conductive film electric heater, which is a kind of electric heater with magnetron sputtering or vacuum coating. The method is to uniformly coat a large area of ​​an electric heater with a metal conductive film on various non-metallic substrates, and the surface temperature is 150-300°C; Chinese patent 00129773.2 discloses an electroformed alloy electric heating element and its manufacturing method. An electroformed alloy film is used as a heating element. In addition, a Chinese patent 00129431.8 discloses an electri...

Claims

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Application Information

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IPC IPC(8): H05B3/14H05B3/44
Inventor 卢基贵杨晓
Owner 北京东方慧辰碳纤维科技有限公司
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