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.
Claims21
A sputter-coated glass article comprising a glass substrate having thereon from the glass outwardly, a layer system comprising:
- (a) an undercoat layer of Si.sub.3 N.sub.4,
- (b) a layer of nickel or nichrome,
- (c) a layer of silver,
- (d) a layer of nickel or nichrome, and
- (e) an overcoat layer of Si.sub.3 N.sub.4 ;
- and, when said glass substrate has a thickness of about 2 mm-6 mm, said 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.
A sputter-coated glass article comprising a glass substrate having thereon from the glass outwardly, a layer system comprising:
- (a) an undercoat layer of Si.sub.3 N.sub.4,
- (b) a nichrome based layer selected from the group consisting of nichrome and nitrided nichrome,
- (c) a layer of silver,
- (d) a nichrome based layer selected from the group consisting of nichrome and nitrided nichrome, and
- (e) an overcoat layer of Si.sub.3 N.sub.4,
- at least one said nichrome based layer being nitrided nichrome, and when said glass substrate has a thickness of about 2 mm-6 mm, said 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.
A sputter-coated glass article comprising a glass substrate having thereon, from the glass outwardly, a layer system comprising:
- (a) an undercoat layer of Si.sub.3 N.sub.4,
- (b) a nichrome based layer selected from the group consisting of nichrome and nitrided nichrome,
- (c) a layer of silver
- (d) a nichrome based layer selected from the group consisting of nichrome and nitrided nichrome,
- (e) a layer of silver,
- (f) a nichrome based layer selected from the group consisting of nichrome and nitrided nichrome, and
- (g) an overcoat layer of Si.sub.3 N.sub.4,
- each said silver layer being about 50 .ANG. thick and at least one said nichrome based layer being nitrided nichrome, and when said glass substrate has a thickness of about 2 mm-6 mm, said coated glass has a visible transmittance greater than about 76%, 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.