In our daily life, if we want to spray a layer of Boron nitride coating on the graphite crucible, we may encounter the situation that boron nitride cannot be sprayed and it flows down. So how can we do this? It should be known that the Boron nitride coating coated on graphite is only to prevent the sintered parts from being polluted and reacted. In fact, there is no high requirement for the quality of the BN layer. In the past, in order to prevent reaction, contamination and promote release, we used alcohol mixed, direct brushing and spraying methods. During spraying, the graphite grinding tool is heated to promote solvent evaporation, leaving a BN coating, which produces better results.

Graphite is a mineral usually produced in metamorphic rocks, formed by regional metamorphism or magmatic intrusion of coal or carbonaceous rocks (or sediments). Graphite is an allotrope of the element carbon, with three other carbon atoms attached to each carbon atom, arranged in a hexagonal honeycomb with weak van der Waals attraction between each layer. Graphite is a conductor of electricity because each carbon atom releases electrons that can move freely. Graphite is one of the softest minerals. It is opaque and greasy, varies in color from iron black to iron gray, and is crystalline, flaky, scaly, streaked, layered, or dispersed in metamorphic rocks. Chemically inert, corrosion resistant.