Which coatings are suitable for use in high temperature environments?

Mold coatings for use in high temperature environments need to be resistant to heat, abrasion, and good release properties. The following are a few types of coatings that are suitable for use in high temperature environments:

1. Hard ceramic coatings
– Aluminum nitride (AlN), aluminum oxide (Al2O3) and other ceramic coatings have very high thermal stability and good wear resistance and can be used in high temperature environments.

2. Carbide coatings
– Carbide coatings such as Tungsten Carbide (WC) and Chromium Carbide (Cr3C2) are applied by thermal spray technology to withstand high temperatures and provide good wear resistance.

3. Hard metal coatings
– Cobalt-based alloy and nickel-based alloy coatings maintain their hardness and corrosion resistance at high temperatures.

4. Hardened metal coatings
– Titanium Nitride (TiN), Chromium Nitride (CrN), Titanium Carbide (TiC), Titanium Carbide Nitride (TiCN), and Aluminum Chromium Nitride (AlCrN) coatings, which provide excellent wear and temperature resistance and are suitable for use at high temperatures.

5. High Temperature Coatings
– Phosphate coatings and silicate coatings can form a protective layer at high temperatures to protect mold surfaces.

6. heat stabilized polymer coatings
– Polyimide (PI) and some types of PTFE (specially treated to improve thermal stability) coatings can also be used at higher temperatures, but they generally have lower temperature limits than metal or ceramic coatings.

7. Multi-layer composite coatings
– By combining the different materials mentioned above into a multilayer coating, it is possible to provide superior performance at high temperatures.

When selecting a coating, the following factors need to be considered:
– Maximum operating temperature: The temperature limit of the coating must be higher than the maximum operating temperature reached by the mold during production.
– Thermal cycling performance: the performance of the coating during thermal expansion and contraction, and its ability to maintain its structural stability and adhesion under thermal cycling conditions.
– Chemical Stability : Under high temperature conditions, the coating cannot react chemically with the mold material or molding material.

Send us your ideas and we’ll get in touch with you within 24H!

Share this post!

Request A Quote