Silicon nitride protective coatings for silvered glass mirrors

摘要: A protective diffusion barrier for metalized mirror structures is provided by a layer or coating of silicon nitride which very dense, transparent, dielectric material that impervious to water, alkali, and other impurities corrosive substances typically attack the metal layers mirrors cause degradation mirrors' reflectivity. The can be deposited on substrate before deposition stabilize metal/substrate interface, it over encapsulate protect from corrosion degradation. Mirrors coated with according this invention also used as front surface mirrors.