Method of making high performance, durable, low-e glass
AssigneeGuardian Industries Corp.
InventorsKlaus W. Hartig, Philip J. Lingle
Life of this patent
Estimating the term…
Abstract
A high performance, durable, low-E glass exhibiting about 80% or more visible transmittance, a hemispherical emissivity (E.sub.h) of about 0.13 or less, and a normal emissivity (E.sub.n) of about 0.10 or less is formed by sputter-coating a layer system on the glass substrate which comprises an undercoat and overcoat of Si.sub.3 N.sub.4, at least one silver layer, and at least two sandwiching layers of a nickel or nickel alloy, preferably with the nickel alloy being nichrome, and the chromium being in the form of a nitride thereof.
Claims11
A method of forming a solar management layering system on a glass substrate, including sputter-coating the following layers in sequence onto said glass substrate:
- a) forming in a nitrogen-containing atmosphere an undercoat layer of Si.sub.3 N.sub.4 ;
- b) forming in an atmosphere comprised of 25%-100% by volume N.sub.2 a first layer of nichrome wherein a substantial portion of the chromium in said nichrome is a nitride thereof;
- c) forming in the same atmosphere employed in step b) at least one layer of silver;
- d) forming in the same atmosphere of steps b) and c) a second layer of said nichrome whereby a substantial portion of the chromium in said nichrome is a nitride thereof;
- e) forming in a nitrogen-containing atmosphere an overcoat layer of Si.sub.3 N.sub.4 ;
- and
- wherein when said glass substrate has a thickness of about 2 mm-6 mm, the coated glass has a visible transmittance of at least about 78%, a normal emissivity (E.sub.n) of less than about 0.12 and a hemispherical emissivity (E.sub.h) of less than about 0.16.
Dependencies are inferred from the claim text.