Low-emissivity glass coatings having a layer of nitrided...

Details Low-emissivity glass coatings having a layer of nitrided... Low-emissivity glass coatings having a layer of nitrided...

2001-03-05

2003-09-23

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C428S432000, C428S701000, C428S702000, C428S428000, C428S469000

Reexamination Certificate

active

06623846

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to coatings for glass substrates. More specifically, the present invention relates to glass substrate coatings which exhibit low emissivity (so-called “low-E” coatings) and substantially no color characteristics.
BACKGROUND AND SUMMARY OF THE INVENTION
Low-E coatings for glass are well known. In this regard, commonly owned U.S. Pat. Nos. 5,344,718, 5,425,861, 5,770,321, 5,800,933 (the entire content of each being incorporated expressly herein by reference) disclose coatings formed of a multiple layer coating “system”. Generally, such conventional multiple layer low-E glass coatings have a layer of a transparent dielectric material (e.g., TiO
2
, Bi
2
O
3
, PbO or mixtures thereof) adjacent the glass substrate and a sequence of multiple layers of, for example, Si
3
N
4
, nickel (Ni), nichrome (Ni:Cr), nitrided nichrome (NiCrN) and/or silver (Ag). These conventional low-E coatings are, moreover, heat-treatable—that is, the coating is capable of being subjected to the elevated temperatures associated with conventional tempering, bending, heat-strengthening or heat-sealing processes without significantly adversely affecting its desirable characteristics.
While the conventional low-E coating systems disclosed in the above-cited U.S. patents are satisfactory, there exists a continual need to improve various properties of low-E coating systems generally. For example, continued improvements in the durability and/or color (or more accurately, lack of color) characteristics in low-E glass coatings are desired. Improvements in such characteristics are important to ensure that the coatings retain their low-E property for prolonged periods of time (even after being subjected to potentially abrasive environment encountered during the manufacturing process—e.g., the washing and cutting of glass articles having such low-E coatings) and have the desired light transmission properties. It is toward fulfilling such needs that the present invention is directed.
Broadly, the present invention is embodied in low-E glass coated glass articles comprised of a glass substrate and a multiple layer coating on a surface of the glass substrate, wherein the coating includes a layer of a transparent dielectric material adjacent the surface of the glass substrate, a layer of nitrided nichrome, and a layer of silver which is sputter coated onto the glass substrate in a nitrogen-containing atmosphere. Most preferably, the coating further includes a layer of silicon oxynitride interposed between the layer of dielectric material and the layer of nitrided nichrome.
These and other aspects and advantages will become more apparent after careful consideration is given to the following detailed description of the preferred exemplary embodiments thereof.


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