Crucible and coating method thereof

The invention discloses a crucible and a coating method of the crucible. The disclosed coating method of the crucible comprises the following steps: coating paint is manufactured, and the coating paint comprises hexagonal boron nitride and pure water; the coating paint is coated on the inner wall of the crucible in a spraying mode; and the crucible is aired to be dry. The possibility of the reaction between the crucible and the hexagonal boron nitride is small, silicone material is not prone to stick to the crucible, the possibility of occurrence of leakage is obviously lowered, and therefore the safety and reliability in the process of production of the silicone material are improved. Meanwhile, a coating is poor in wettability with liquid silicone and is not prone to stick to the silicone materials under the condition of carrying the liquid silicone. In addition, due to the fact that the hexagonal boron nitride has good wettability, demolding of a silicone ingot is good. The coating enables the heat conduction to be more uniform in the growth process of the silicone ingot, so that the interior quality of the silicone ingot is improved. Therefore, the coating method of the crucible is capable of reducing the sticking and permeation between the crucible and the liquid silicone material, plays a role in a protective layer, has the functions of lubrication and demolding, and improves the production quality of the silicone material and production efficiency.