Medium frequency electric furnace optimized sintering curve

The heating and sintering curve of the intermediate frequency electric furnace is mainly divided into three stages, namely, the oven stage, the semi-sintering stage, and the complete sintering stage.

The oven stage is primarily the conversion of β-quartz to α-quartz at 573 ° C. The purpose of this stage is primarily to remove moisture from the lining. Now, after the furnace materials and process are optimized, the temperature is rapidly raised to 600 °C from room temperature, and the temperature is kept for 1 hour to completely drain the water. The semi-sintering stage is based on the polycrystalline transformation of silica sand. The α-quartz becomes α-phosphorus quartz at 875 ° C. The key stage of semi-sintering is to slowly heat up to 900 ° C and keep it for 2 h. The stress generated by the volume effect avoids looseness and cracking of the product during firing. The quartz crystal form transition is completed in the complete sintering stage, the temperature is raised to 1200 ° C, and the temperature is maintained for 2 h. If the sintering temperature is insufficient and the thickness of the sintered layer is insufficient, the service life of the intermediate frequency furnace will be significantly lower.

It should be pointed out that the polycrystalline transformation is very slow. Even if the sintering is completed, the surface layer is very thin. In the subsequent production, the thickness of the sintered layer should be gradually increased during the high temperature molding to make it have sufficient strength. Hard shell. In addition, it is necessary to uniformly add iron around the steel mold in time to make the current evenly distributed, to avoid partial concentrated ignition, to protect the steel mold from melting normally, to avoid partial high temperature burn lining, and to affect the furnace life.

For more information about the intermediate frequency electric furnace, diathermy furnace and induction furnace of Kunshan Wantai Electric Furnace Co., Ltd., please contact Xiaobian.