Composite ceramic evaporator boat is a general term for evaporating vessels. The ingredient formula varies depending on the intended use. Generally, it is composed of various metal non-metallic compounds such as boron nitride, titanium diboride, aluminum nitride, aluminum oxide, zirconia, silicon carbide, silicon nitride, etc. After understanding the uses of the evaporator boat, we will now introduce some aspects that need to be noted when using the composite ceramic evaporator boat.
1. To avoid getting water on the surface of the composite ceramic evaporator boat, because the boron nitride component in the boat easily absorbs water, which vaporizes and expands during heating, causing the evaporator boat to explode.
2. When installing a composite ceramic evaporator boat, it is necessary to maintain a certain inclination (slightly higher at the end of the aluminum wire) to facilitate the flow of liquid aluminum to the end of the boat. This is important for increasing the spreading area of liquid aluminum, improving the lifespan of the evaporation boat, and improving the uniformity of the coating. The evaporation boat should be kept horizontally.
3. Avoid contact with the surface of the boat groove to avoid getting dirty, which will reduce the wettability of the boat groove surface to liquid aluminum.
4. The length of the clamping parts of the boat clamps at both ends of the evaporating boat should be consistent, and good electrical and mechanical contact should be ensured to avoid generating additional heat on the boat clamps. Ensure consistent temperature on both sides of the boat to prevent it from bending. Insert the evaporating boat into the graphite sheet and boat clamp, as excessive pressure can cause the boat to crack. If the installation is too loose or too tight during the first use of the new boat, you should refer to the instruction manual of the boat clamp. Operators should pay great attention to the machining tolerances of the evaporation boat (the length, width, and parallelism of the boat are all very important). Use graphite sheets to eliminate the gap between the boat and the boat clamp and improve their contact. There should be sufficient pressure between the two ends of the boat and the boat clamp, and it is also necessary to ensure that the boat can expand and contract during heating. The aluminum oxide should be removed from the movable side of the fixture.