Window units made using ceramic frit that dissolves physical vapor deposition (PVD) deposited coatings, and/or associated methods
Certain example embodiments relate to the use of a ceramic frit that dissolves an already-applied thin film coating (disposed via a physical vapor deposition (PVD) process such as sputtering, or other suitable process). In certain example embodiments, the ceramic frit is aggressive in chemically removing the coating on which it is disposed, e.g., when exposed to high temperatures. The frit advantageously fuses well with the glass, provides aesthetically desired colorations, and/or enables components (e.g., insulated glass (IG) unit spacers) to be reliably mounted thereon, in certain example embodiments. Associated coated articles, IG units, methods, etc., are also contemplated herein.
1. A method of making an intermediate article to be used in an insulated glass (IG) unit, the method comprising:
printing a frit in a desired pattern on a first glass substrate supporting a heat treatable physical vapor deposition (PVD) deposited infrared (IR) reflecting multi-layer coating, at least a portion of the frit directly contacting the coating;
wherein the coating comprises at least one IR reflecting layer sandwiched between at least first and second dielectric layers;
thermally tempering the first glass substrate with the coating and the frit thereon, the thermal tempering dissolving the coating in areas where the frit contacts the coating and fusing the frit directly to the first glass substrate in making an intermediate article configured to be used in the IG unit.
2. The method of claim 1 , further comprising:
orienting a spacer system around a peripheral edge of the intermediate article;
locating a second substrate on the spacer system so that the first and second substrates are substantially parallel to and spaced apart from one another; and
applying an adhesive to one or more mating areas of the spacer system, the first substrate, and the second substrate to seal together the IG unit.
3. The method of claim 1 , wherein said IR reflecting layer comprises silver; ITO; or Ni and/or Cr.
4. The method of claim 1 , further comprising, prior to said thermally tempering, drying and/or pre-curing the frit at a temperature that does not exceed 250 degrees C.
5. The method of claim 1 , wherein the coating is removed proximate the frit via the dissolving without using another form of edge deletion.
6. The method of claim 1 , wherein mechanical edge deletion is not used in removing portions of the coating.
7. The method of claim 1 , wherein the IR reflecting layer comprises silver.
8. The method of claim 1 , wherein the first and second dielectric layers each comprise silicon nitride.
9. The method of claim 1 , wherein the first dielectric layer comprises zinc oxide and the second dielectric layer comprises silicon nitride.
10. The method of claim 1 , wherein the coating further comprises a layer comprising Ni and/or Cr located over and directly contacting the IR reflecting layer, and wherein the IR reflecting layer comprises silver.
11. The method of claim 1 , further comprising coupling the first glass substrate with the coating and frit thereon to another glass substrate via at least one spacer in making the IG unit, so that an air gap is provided between the first and second glass substrates in the IG unit.
12. The method of claim 11 , wherein the IG unit passes tests according to EN1279-2 concerning aging behaviors including requirements for moisture penetration; and/or tests according to ETAG 002 concerning structural sealant requirements.
13. The method of claim 1 , wherein said printing comprises screen printing.