The coating will be base on Siloxane or PTFE or any other inorganic material. The coating will cure at room temp. or ypto 250 degree centigrade temperature. The continues temperature will be 450 degree centigrade.
There is no organic polymer that can withstand 450°C. At such operating temperatures only inorganic materials (metals and ceramics) come into question. Even a normal lubrication based on organic liquids (oils) can not be used for such friction pair.
Thanks for your suggestion. I think Methyl Phenyl Siloxane with HBN nano powder gives good results. If you have any coating idea with my requirement. Please share it.