Alumina lining material oven process will affect the service life of induction furnace
The oven is the process of obtaining a sintered layer for the alumina lining material. The quality of the sintered layer directly affects the service life of the furnace, and the oven is an important link.
After the oven cavity is built, the oven should be dried immediately; before the oven, check whether the electrical equipment and cooling water system are normal; the oven must be carried out in strict accordance with the oven process. The oven process is the key factor in the oven process, the specific points:
① It is necessary to control the heating speed, especially in the early stage of the oven. If the heating speed is too fast and the moisture in the furnace lining is discharged too fast, cracks are easily formed, which greatly shortens the life of the furnace.
②When the furnace lining is heated to 573°C, the quartz will expand too fast during the phase transition process, which will easily cause cracks or even peeling. Therefore, the heating speed should be slowed down when heated from 400°C to 600°C, and the temperature should be kept for 1h~2h at 870°C. , So that it can slowly and completely phase change.
③Oven. The latter stage is sintering and holding. The sintering temperature depends on the specific refractory material. Generally, it is hoped that a sintered layer with a thickness of 30% of the lining thickness can be obtained. Therefore, the sintering temperature is generally 50-100 ℃ higher than the tapping temperature.