How to use composite ceramic evaporation boats correctly?

If the composite ceramic evaporation boat is used correctly, it can not only extend its service life, but also bring us greater economic benefits! Composite ceramic evaporation boat is a general term for evaporation vessels. The ingredient formula varies depending on the purpose of 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 purpose of the evaporation boat, let's introduce some aspects that need to be noted when using composite ceramic evaporation boats.

1. The two rows of fixtures of the composite ceramic evaporation boat should be aligned and the surface should be bright.

2. Graphite paper should be used on the end face or side face of the composite ceramic evaporation boat to ensure good electrical contact and heat conduction.

3. Prevent contact with the surface of the boat slot and prevent dirt, which will reduce the wetness of the boat slot surface to liquid aluminum.

4. The contact point of the aluminum wire should be located at one-third to half of the length of the composite ceramic evaporation boat.

5. The initial heating of the new composite ceramic evaporation boat should not be too fast to prevent it from affecting gas release.

6. For the initial use of the new composite ceramic evaporation boat, the aluminum feeding speed should gradually increase from about 75% of the normal rate, and the power should be gradually reduced to reach a larger liquid aluminum spreading area.

7. To prevent the surface of the composite ceramic evaporation boat from getting stained with water, the boron nitride component in the boat is easy to absorb water, which causes the evaporation boat to explode during heating due to the expansion of water vaporization.

8. When installing a composite ceramic evaporation 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 regarding the added liquid aluminum spreading area, the lifespan of the forward evaporation boat, and the uniformity of the forward coating. The evaporation boat should adhere to the horizontal plane horizontally.

9. The length of the clamping part of the boat clamp at both ends of the evaporation boat should be adhered to together, and good electrical and mechanical contact should be ensured to prevent rated heat from occurring on the boat clamp. Ensure that the temperatures on both sides of the boat are kept together to prevent the boat from bending. Insert the evaporation boat into the graphite sheet and boat clamp, assuming that excessive pressure will cause the boat to crack. When using the new boat for the first time, it is assumed that the device is not good if it is too loose or too tight. You should refer to the manual of the boat clamp. Operators should pay great attention to the machining tolerance of the evaporation boat (the length, width, and parallelism of the boat are all very important.) Use graphite sheets to sweep the open space 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 together, it is necessary to ensure that the boat can expand and become elastic during heating. The active side of the clamp should be cleaned of aluminum oxide.

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