I was wondering what process steps I should take to coat a surface with PTFE aqueous dispersion.
I have question about your application. If you are trying to study the boundary regime in high pressure applications you should use catalysts such as TiF3 or FeF3 to coat the surface at a temperature of 120 C.
you can dip/spray coat the substrate with PTFE dispersion. Dry it at 120°C then sinter it at temperature just above melting point of PTFE.
Basically I want to coat a silicon structured surface with PTFE. What I have seen here and there is that in 120C the water content evaporates and then the temperature goes up to 270C to remove wetting agent and then 337C for melting the PTFE particles. However, I'm not sure about the duration of each step, ramp up and cooling down.
Depending upon the sample size and its content, you can decide about the duration of each step. Drying usually around 1 hour is sufficient to remove water and for further steps time can be decreased.
I think the duration of each step depend on the PTFE concentration and purity. If you are working with submicron particles curing should be faster.
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