A method for bonding multiple materials of large graphite heating elements used in the production of vacuum induction furnaces

Abstract

A bonding method for multiple pieces of large-scale graphite heating elements used in the production of vacuum induction furnaces. Graphite blocks are used to splice large-scale graphite heating elements. The graphite blocks are respectively provided with "T"-shaped bosses and "T"-shaped slots that cooperate with each other. , two adjacent graphite blocks are clamped to each other through the boss and the card slot and there is a gap for glue filling, and a threaded hole is opened on the upper end surface of the mutually locked boss and card slot; the spliced ​​graphite heating element is placed on the In the drying furnace, use the glue injection valve of the high-pressure glue gun to connect with the threaded hole of the graphite heating element, and fully fill the high-temperature graphite glue into the glue-filling gap of the spliced ​​graphite heating element. The high-temperature graphite glue is composed of furfuryl alcohol and tallic acid TEA salt , superconducting carbon black and artificial graphite powder, and dried to obtain a large graphite heating element. The advantages are: it can produce graphite heating elements with a diameter of more than 2000mm, and the yield is high, and it is widely used in domestic carbon-carbon composite, military industry and vacuum sintering fields.

Description

technical field [0001] The invention relates to a method for bonding multiple materials of a large-scale graphite heating body used in the production of a vacuum induction furnace, and the technology is widely used in the fields of military industry, photovoltaic, carbon-carbon composite and vacuum equipment. Background technique [0002] Graphite induction heating means that a large current flows to a heating coil that is wound into a ring or other shapes. The heating coil is usually made of copper tube. As a result, a strong magnetic beam with an instantaneous change in polarity is generated in the heating coil. When the graphite heating element is placed in the coil, the magnetic beam will penetrate about 20mm on the surface of the graphite heating element, and an impedance will be generated inside the graphite heating element in the opposite direction to the heating current. A correspondingly large eddy current will be generated. Due to the existence of resistance in th...

AI Technical Summary

Problems solved by technology

However, there are only two carbon companies located in Zibo City, Shandong Province that can produce graphite blanks with a diameter of 2000mm in China, and the yield is extremely low and the sales price is extremely high.

However, graphite blanks with a diameter of more than 2000mm have not been produced and processed by any enterprise so far, which seriously curbs the production and development of large-scale products in the domestic carbon-carbon composite, military industry, photovoltaic and vacuum sintering fields.

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