Remember : Precautions for using ceramic crucible:
1. can not use gasoline spray guns, acetylene gun, alcohol spray light directly;
2. the crucible first uses the oven for 120 minutes of oven for about 105 ° C before use.
3. the temperature rise \\ cooling speed should not be too fast, 1200 ° C or lower, <5 ° C \\ minute; 1200 ° C or more, <4 ° C \\ minute; cooling recommended energization temperature control cooling, high temperature shutdown power supply with the overtime cooling speed is too fast, there is It may cause cracking.
4. crucible and heating body (silicone carbon tube, silicon rod, heating wire, etc.) should be greater
than 2 cm.
5. the bottom is not directly in contact with the bottom of the furnace, it is recommended to use the temperature resistant substance such as corundum to form an air convection.