We would like to coat a steel substrate (316L) with a highly reflective (> 80%) metallic or dielectric coating for 400°C operating temperature and minimum degradation with time. Is an Al deposition with a SiO2 protection layer a good choice? Thank you in advance.
Jim,
The components are small mirrors (3 mm diameter) and will see no abrasion. Do you think we will still have expansion mismatch problems, considering that the SiO2 layer is thinner than 1 micron?