Production method for high temperature crystallized silicon carbide composite electric heating element

Abstract

The invention relates to a production method for a high temperature crystallized silicon carbide composite electric heating element. The production method comprises the steps of mixing materials for 10-15 minutes to make the materials mixed uniformly by using green silicon carbide composition as a raw material; adding a bonding agent, stirring for 15-30 minutes; press molding at a vacuum degree not less than 0.08 MPa to obtain a raw product; pushing the molded raw product into a baking oven, baking the raw product for 8-15 hours; directly introducing the baked product into a sintering process, wherein a sintering temperature is 2,300-2,600 DEG C, and a sintering time is 90-120 minutes; binding a heating part and an end part of the baked product together through the bonding agent made of a resin according to resistance requirements of a market; sending the product into an oven with a temperature of 180-200 DEG C, baking for 5-10 hours; introducing the baked bonded product into a welding process; heat-testing a resistance value by combining a standard after the product is welded, and then sending the tested product into a finished product warehouse for packaging. The production method is simple and accurate in equipment control, increases product yield and reduces product cost.

Description

technical field [0001] The invention relates to a method for producing silicon carbide products, in particular to a method for producing a high-temperature recrystallized silicon carbide composite electric heating element. Background technique [0002] The production method of the existing high-temperature crystalline silicon carbide composite electric heating element is to adopt the method of producing silicon carbide products—silicon carbon rods in China in the 1960s. The production steps are as follows: first boil the asphalt, and use the boiled asphalt as a binder ; Mixing, select three kinds of silicon carbide with a particle size between 60#-180#; pair of rolls; forming, put the sheet material of the pair of rolls in an iron plate, transport it to the cylinder of the hydraulic press, and carry out two steps first After pre-pressing, install the planning mold after confirming that it is uniform. The specifications and length required for molding. Since the molding mold ...

AI Technical Summary

Problems solved by technology

The existing process is complicated, the process line is long, and there are many unpredictable factors during the operation of the equipment; there are many raw materials and auxiliary materials involved, and the silicon carbide composite electric heating element is mainly an element that generates heat by resistance. Due to the backward burying and firing process, the technical control range is large, the high-temperature siliconization of the product in the electric furnace is uneven, and the degree of resistance dispersion is poor, which directly affects the qualified rate of the product and increases the cost input; When turning into plain products, the equipment and refractory materials used are the same as those of the enterprise’s downdraft kiln. The temperature is 1200°C, and coal needs to be used for heating. The energy consumption is large, the cycle is long, and the pollution to the surrounding environment is particularly serious. Difficult to control, the resistance aging is fast; in addition, because the raw product using asphalt as the binder is easy to harden after being placed in a cold water pool, the straightness of the raw product must be baked and shaped in an oven at a temperature of 60°C, and the process is relatively difficult. complex