Immersed gas ceramic inner heater sleeve and preparation method thereof

Abstract

The invention discloses an immersed gas ceramic inner heater sleeve and a preparation method thereof. The sleeve comprises an outer SiC composite ceramic tube and an inner SiC ceramic tube stretching to the bottom of the outer tube, wherein a SiO2 composite anti-oxidation layer is coated on an inner wall of the outer tube and a Si3N4 / AlN immersion-resistant layer is coated on an outer wall of the outer tube; an opening of the outer tube is provided with a flange communicated with a tai gas pipeline; one end of the inner tube extending out of the outer tube is in flange connection with a gas generating system; and an upper side face at one end of the inner tube extending out of the outer tube is communicated with a compressed air pipeline. The preparation method comprises the following steps of: preparing SiC composite ceramic serving as the outer tube; coating a Si3N4 / AlN composite coating on the outer wall of the outer tube and performing heat treatment, and coating a dense SiO2 anti-oxidation layer on the inner wall of the outer tube and performing heat treatment; and finally, preparing a SiC ceramic inner tube, siliconing, sintering and performing heat treatment. Compared with an electric heating system sleeve, the inner heater sleeve has higher safety and operating stability and can upgrade equipment on the conventional production base.

Description

technical field [0001] The invention belongs to the technical field of heater casings, and in particular relates to a submerged gas ceramic inner heater casing and a preparation method thereof. Background technique [0002] Non-ferrous metal heating and melting furnaces are the core equipment for melting, heat preservation and purification of aluminum, zinc and their alloys in industries such as hot-dip galvanizing and hot die-casting. 35% and 50%. At present, most of the traditional heating furnaces widely used in my country adopt external heating of iron crucible or upper radiation heating. These heating methods all have a series of problems such as severe crucible corrosion, high energy consumption, serious environmental pollution, and low resource utilization. In particular, due to the reaction of zinc-iron and aluminum-iron to form a large amount of slag or a large amount of oxidation on the radiation liquid surface, the quality of the melt and the final product is low,...

AI Technical Summary

Problems solved by technology

However, since most of the internal heaters designed are heated by built-in electric heating elements, such as the composite ceramic internal heating technology described in the Chinese patent No. CN101765255A, in some areas of our country due to the shortage of power resources or the high cost of equipment upgrades, etc., Limit the popularization and application of internal heating technology

Images