Coatings

摘要

A scratch resistant coating for the window of an infra red sensor comprises a layer of zirconium oxynitride or hafnium oxynitride. The formula of the coating is M1-(y+z)OyNz where y and z are both in the range 0.1 to 0.4. The coating and the window are both transmissive in the infra red and visible ranges of the spectrum.