Aluminum heating element with aluminum nitride film, preparation method and heating device

Abstract

The invention relates to an aluminum heating element with an aluminum nitride film. The aluminum heating element comprises an aluminum substrate, wherein the aluminum nitride film covers the surface of the aluminum substrate. The invention further relates to a preparation method of the aluminum heating element with the aluminum nitride film. According to the method, one electrode of a pulsed power supply is connected with the aluminum substrate, and the other electrode is connected with an aluminum tool electrode; the pulsed power supply is started, and the tool electrode is moved above the aluminum substrate in a nitrogen atmosphere, so that the aluminum nitride film is formed on the surface of the aluminum substrate. According to the heating element provided by the invention, the aluminum nitride film is formed on the surface of the aluminum substrate, so that aluminum is prevented from being oxidized into aluminum oxide, the heat conducting property of the formed aluminum heating element cannot be reduced due to the aluminum oxide formed on the surface, and fast heat transfer can be realized, thereby improving the heat transfer efficiency; the production process of the heating element provided by the invention has the advantages of simplicity and low cost. The heating element provided by the invention can be applied to a heating device and has great market application values especially on a balance type heater.

Description

technical field [0001] The invention relates to the field of heaters, in particular to an aluminum heating element with an aluminum nitride film. Background technique [0002] The counter balance heater adopts aluminum heating element, which is widely used because of its good thermal conductivity, simple production process and low price, but because its aluminum surface is easily oxidized to form alumina, and the thermal conductivity of alumina It is only 1 / 8 of aluminum, which greatly reduces its heat dissipation performance, thereby reducing its heating effect. In the existing production, its structure is optimized, such as made of string aluminum, fins and other structures to increase its heat dissipation area, thereby increasing The heat dissipation effect may be replaced by other ceramic materials with excellent thermal conductivity, such as ceramic blocks such as silicon carbide. However, due to the limitation of structure and process, the heat dissipation area can on...

AI Technical Summary

Problems solved by technology

[0002] The counter balance heater adopts aluminum heating element, which is widely used because of its good thermal conductivity, simple production process and low price, but because its aluminum surface is easily oxidized to form alumina, and the thermal conductivity of alumina It is only 1 / 8 of aluminum, which greatly reduces its heat dissipation performance, thereby reducing its heating effect. In the existing production, its structure is optimized, such as made of string aluminum, fins and other structures to increase its heat dissipation area, thereby increasing Its heat dissipation effect can be replaced by other ceramic materials with excellent thermal conductivity, such as silicon carbide and other ceramic blocks

However, due to the limitation of structure and process, the heat dissipation area can only be increased limitedly, and its improvement effect is limited, and the heat dissipation efficiency cannot be significantly improved. However, the ceramic block heating element generally needs to be sintered, and its sintering temperature needs to be 1000°- 1900°, the process is not easy to control, and defects such as holes are prone to occur, resulting in reduced mechanical properties and thermal conductivity, and the use of bulk ceramic materials has a large volume, high material consumption, and high production costs

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