Mica high temperature resistant electrothermal film and preparation method thereof

Abstract

The invention provides a mica high temperature resistant electrothermal film and a preparation method thereof. The mica high temperature resistant electrothermal film comprises a metal electrode, and a first mica layer, a first heat conduction film, a metal heating layer, a second heat conduction film and a second mica layer which are successively stacked from bottom to top; the first heat conduction film is evenly coated on the upper surface of the first micro layer; the metal heating layer is arranged on the upper surface of the first heat conduction film; a plurality of conductive alloy bars are evenly distributed on the metal heating layer; the metal electrode is electrically connected with the metal heating layer; the second heat conduction film is evenly coated on the upper surface of the metal heating layer; the second mica layer is arranged on the upper surface of the second heat conduction layer; the main components of the first heat conduction film and the second heat conduction are silicon carbide; and the mass fraction of the silicon carbide is more than or equal to 50 %. According to the mica high temperature resistant electrothermal film and the preparation method thereof, the use security and service life problems resulted from partial over heat of the micro electrothermal film can be effectively solved.

Description

technical field [0001] The invention belongs to the field of mica material processing, and in particular relates to a mica high temperature resistant electrothermal film and a preparation method thereof. Background technique [0002] Mica is a high-quality insulating material, which has the advantages of non-toxic, odorless, high temperature resistance, high pressure resistance, aging resistance, corrosion resistance, stable electrical performance, etc., especially its high temperature resistance and reworkability are irreplaceable by other materials . Traditional heating sources include burning fuel and generating heat with electric heating elements. Although the former has a high heat conversion rate, it pollutes the environment more seriously. The latter is a variety of heating equipment made of electric heating elements. It uses air convection to transfer heat to a certain space. It is easy to install and easy to use at home. However, the electric heating elements of t...

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Problems solved by technology

However, the heating element of the mica electric heating film disclosed in this invention is close to the mica substrate, which has high power density per unit cross-sectional area, high surface temperature, large local expansion coefficient, easy deformation, and noise during operation. The temperature is very high and the local expansion coefficient of the mica is too large, which causes problems such as short circuit of the heating wire, sparking, and rapid oxidation.

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