Preparation procedures - Formation mechanisms - Melt-based formation mechanism
6 important questions on Preparation procedures - Formation mechanisms - Melt-based formation mechanism
For which materials is melt-based formation mechanism suitable?
What happens during melt-based formation mechanism?
Which 2 mechanisms in melt-based formation mechanism can lead to the formation of a coating?
- If the product itself is below the crystallisation or solidification temperature, the melt will solidify against the product. If this is caused by crystallisation, this will lead to a solidified layer around the product.
- The melt does not solidify during dipping; a layer of liquid material sticks to the surface of the product. The time of immersion is not important. The product should be transferred as quickly as possible to a cooler (e.g. Blast cooler), where the film is solidified.
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How are the coating thickness and keeping time in the cooler related?
What can be reasons that the coating is inhomogeneous due to film drainage?
- Not have a sufficiently high viscosity
- Have another barrier against flow
What can prevent material to have film drainage?
- Rotating the product
- Adding components, such as polymers to the solution
- Properties of the film can be altered by tempering. This can lead to re-crystallisation, giving other crystal shapes or different orientation in the film. It can also lead to a reduction in the amount of defects and to a change in mechanical properties.
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