Silicon nitride protective coatings for silvered glass mirrors
- Golden, CO
A protective diffusion barrier for metalized mirror structures is provided by a layer or coating of silicon nitride which is a very dense, transparent, dielectric material that is impervious to water, alkali, and other impurities and corrosive substances that typically attack the metal layers of mirrors and cause degradation of the mirrors' reflectivity. The silicon nitride layer can be deposited on the substrate before metal deposition to stabilize the metal/substrate interface, and it can be deposited over the metal to encapsulate it and protect the metal from corrosion or other degradation. Mirrors coated with silicon nitride according to this invention can also be used as front surface mirrors.
- Research Organization:
- MIDWEST RESEARCH INSTITUTE
- DOE Contract Number:
- AC02-83CH10093
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4780372
- OSTI ID:
- 866751
- Country of Publication:
- United States
- Language:
- English
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