What are the reasons for the cracks in the furnace of the high-temperature muffle furnace?

1. Subject to physical collision

The high-temperature muffle furnace is impacted or vibrated by external forces.

2. No muffle oven drying

The muffle furnace must be used for the muffle furnace when it is used for the first time or if it has not been used for a long time.

3. Open the furnace door at high temperature

Opening the muffle furnace at a high temperature will cause cracks in the furnace insulation material due to excessive temperature difference and shorten the service life. Therefore, opening the furnace door in a long-term high temperature state will cause the furnace wall to burst due to the large temperature difference between the inside and the outside; it is generally recommended that the muffle furnace is at least cooled to 600 ℃ before opening the furnace door carefully.

4. The heating rate is too fast

In the working process, generally below 300℃, the heating rate should not be too fast, because the furnace is cold at the beginning of the heating, and a large amount of heat needs to be absorbed.

5. The cooling speed is too fast

The cooling rate of the muffle furnace cannot be too fast, otherwise the refractory material in the furnace will burst due to thermal gravity.