Production process for heating ceramic cores of infrared-radiation heaters

Abstract

The invention provides a production process for heating ceramic cores of infrared-radiation heaters. Both the inner surface and the outer surface of a silicon-carbide heating ceramic core are attached with silica glass layers. The production process includes: (1), producing the heating ceramic core by silicon carbide crystals; (2), spraying molybdenum silicide layers on the silicon-carbide heating ceramic core to obtain the silicon-carbide heating ceramic core with the molybdenum silicide layers; (3), enabling molybdenum silicide on the inner surface and the outer surface of the silicon-carbide heating ceramic core obtained in the step (2) to react with oxygen in air to form silica so as to obtain silica substrate layers; (4), placing the silicon-carbide heating ceramic core obtained in the step (3) into a silica smelting furnace to form embryonic silica glass layers; and (5), moving the silicon-carbide heating ceramic core obtained from the step (4) to a hydroxyl removing furnace to obtain the silica glass layers. Thickness of the silica glass layer of the heating ceramic core can be decreased, temperature rise speed of the heating ceramic core can be increased, high production efficiency can be achieved, the silica glass layers cannot fall off, and production cost can be reduced for enterprisers greatly.

Description

technical field [0001] The invention relates to a ceramic heater, in particular to a method for manufacturing a ceramic heating core of an infrared radiation heater. Background technique [0002] At present, when the silicon carbide crystal used in the infrared radiation heater is used to make the heater, it is necessary to wrap silicon dioxide on the surface of the silicon carbide crystal to protect the silicon carbide crystal, improve the oxidation resistance of the heater, and prolong the service life. The manufacturing method of the existing ceramic heater is to package the heating core made of silicon carbide crystal in the double-layer silica glass tube, and make the two fixedly connected by welding. The ceramic heater made by the method can realize the water and electricity isolation effect, and the infrared radiation generated by the silicon carbide crystal can pass through the silica glass smoothly. The heat emitted by the silicon carbide crystal needs to exchange ...

AI Technical Summary

Problems solved by technology

The heat emitted by the silicon carbide crystal needs to exchange heat with the silica glass tube first, and then the heat will be dissipated by the silica glass tube. Therefore, the thickness of the silica glass tube determines the heating speed of the ceramic heater. Due to the double layer The silicon dioxide glass tube needs at least a thickness of 1mm when the silicon dioxide glass tube is made under the existing technical conditions, so the current existing ceramic heaters all have the disadvantage that the heating rate is not fast enough

In addition, in the existing manufacturing methods of ceramic heaters, the packaging and welding process steps of the heating core are cumbersome, the operation is difficult, the production efficiency is low, the connection strength between the silica glass layer and the ceramic heating core is low, and it is difficult to use for a long time The rear silica glass layer is easy to fall off, the service life is short, the defective rate during production is more than 5%, and the production cost of the enterprise is relatively high

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