Oxide protected mirror

Details Oxide protected mirror Oxide protected mirror

1979-08-23

1981-06-09

Hoffman, James R.

Stock material or miscellaneous articles

Composite

Of quartz or glass

427162, 427164, 427165, 427166, 427167, 428434, 428472, 204192C, B05D 302, G02B 110, G02B 508

Patent

active

042725887

ABSTRACT:
A mirror is made by applying a coating to a highly reflective surface of a substrate. The coating is prepared from a composition of an alkoxide having the general formula M(OR).sub.n, where M is 0 to 100% titanium, 0 to 25% silicon, 0 to 100% tantalum, or 0 to 15% of a metal ion which forms an alkoxide, R is alkyl from C.sub.1 to C.sub.6 and n is the valence of M, about 1.7 to about 8 moles of water per mole of alkoxide, sufficient alcohol to give a solids content of about 0.5 to about 15%, and a sufficient amount of a suitable acid to prevent cloudiness. The coated substrate is fired at about 200.degree. to about 600.degree. C. to form an oxide coating which is substantially oxygen impervious. Additional layers of the coating may be applied and fired until the oxide coating is about 200 to about 5000A thick, avoiding quarter-wave thicknesses.

REFERENCES:
patent: 2584905 (1952-02-01), Moulton et al.
patent: 2689858 (1954-09-01), Boyd
patent: 2710267 (1955-06-01), Boyd
patent: 2768909 (1956-10-01), Haslam
patent: 3094436 (1963-06-01), Schroder
patent: 3460956 (1969-08-01), Dahle

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