Silicon carbide rod with low oxidation degree under high-temperature condition

Abstract

The invention discloses a silicon carbide rod based on a low oxidation degree under a high temperature condition, and relates to the technical field of electric heating elements, the silicon carbide rod comprises a cold end part and a heating element, and a preparation method of the heating element comprises the following steps: S1, mixing and stirring silicon carbide, boron carbide, molybdenum disilicide and a resin adhesive, adding water, and stirring to obtain a mixture; the mixture is added into a press to be pressed, and a blank is obtained; s2, heating and drying the pressed blank, and sintering and molding at high temperature under the protection of argon to obtain a matrix; s3, absolute ethyl alcohol is added into the silica sol, then porous silicon powder is added into the silica sol, the surface of a base body is coated with the mixture after uniform stirring, heating, drying and forming are conducted, then heat treatment is conducted at high temperature, a silicon dioxide protection film is formed on the surface of a blank, and the heating body is obtained. The surface of the silicon carbide rod is coated with the coating formed by the silica sol and the silicon powder, so that the aging of the silicon carbide rod is reduced.

Description

technical field [0001] The invention relates to the technical field of electric heating elements, in particular to a silicon carbide rod with low oxidation degree under high temperature conditions. Background technique [0002] Silicon carbon rod is a rod-shaped and tubular non-metal high-temperature electric heating element made of high-purity green hexagonal silicon carbide as the main raw material, processed into a billet according to a certain material ratio, and recrystallized and sintered at a high temperature of 2200 ° C. . [0003] In the prior art, the silicon carbide and silicon carbon rods will continue to age during the high temperature use process. The aging process is mainly due to the increase in the resistance value, which leads to the process of reducing the service life. Because the silicon carbide silicon carbon rods are heated for a long time in the degassing box. , the temperature reaches above 800 ℃, the long-term use of silicon carbide rods can have t...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a silicon carbide rod with a low degree of oxidation under high temperature conditions, based on the problem that the existing electric heating element silicon carbide rod is easy to age at high temperature and is improved;