# US 5,705,278 A · Heat processable metallic vacuum coatings

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- Number: US 5,705,278 A
- Document ID: US5705278A
- Status: Granted
- Kind: A
- Application number: 07/768,791
- Filed: 1991-09-30
- Granted: 1998-01-06
- Earliest claimed: 1991-09-30
- Assignees: PPG Industries, Inc.
- Inventors: F. Howard Gillery; Thomas J. Waynar
- Web page: https://patentgrep.com/patent/US5705278A

## CPC

- C03C 17/3605: {Coatings of the type glass/metal/inorganic compound}
- C03C 17/3435: {comprising a nitride, oxynitride, boronitride or carbonitride}
- C03C 17/3441: {comprising carbon, a carbide or oxycarbide}
- C03C 17/36: at least one coating being a metal
- C03C 17/3607: {Coatings of the type glass/inorganic compound/metal}
- C03C 17/3615: {Coatings of the type glass/metal/other inorganic layers, at least one layer being non-metallic}
- C03C 17/3618: {Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic}
- C03C 17/3626: {one layer at least containing a nitride, oxynitride, boronitride or carbonitride}
- C03C 17/3642: {the multilayer coating containing a metal layer}
- C03C 17/3652: {the coating stack containing at least one sacrificial layer to protect the metal from oxidation}
- C03C 17/3689: {one oxide layer being obtained by oxidation of a metallic layer}
- C03C 17/40: all coatings being metal coatings
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

A heat processable metallic appearing coated article is prepared by coating a glass substrate with a metal-containing film such as chromium or titanium nitride, which ordinarily oxidizes at high temperature, and overcoating with a protective layer of a different metal which forms a dense oxide surface layer. The coated article is subjected to high temperature processing such as bending without losing its metallic appearance to oxidation.

## Claims

### Claim 1

A heat processable, metallic appearing coated article comprising:
a transparent glass substrate;
a metallic appearing metal-containing film deposited on a surface thereof;
an amorphous metal oxide layer over the metallic appearing metal containing film; and
a protective layer comprising a different metal from the metal-containing film deposited over the amorphous metal oxide layer.

### Claim 2 (depends on 1)

A coated article according to claim 1, wherein the metal-containing film is selected from the group consisting of metals, metal nitrides and metal carbides.

### Claim 3 (depends on 2)

A coated article according to claim 2, wherein the metal-containing film is selected from the group consisting of chromium nitride and titanium nitride.

### Claim 4 (depends on 1)

A coated article according to claim 1, wherein said protective layer is a metal which forms a dense oxide surface.

### Claim 5 (depends on 4)

A coated article according to claim 4, wherein said protective layer is selected from the group consisting of chromium, titanium and silicon.

### Claim 6 (depends on 1)

A coated article according to claim 1, wherein the metal-containing layer is chromium nitride and the protective layer is titanium.

### Claim 7 (depends on 1)

A coated article according to claim 1, wherein the metal-containing layer is titanium nitride and the protective layer is silicon.

### Claim 8 (depends on 1)

A coated article according to claim 1, wherein said metal oxide layer comprises zinc and tin.

### Claim 9

A heat processable, metallic appearing coated article comprising:
a. a transparent glass substrate;
b. a metallic appearing metal-containing film selected from the group consisting of chromium nitride and titanium nitride;
c. a protective layer selected from the group consisting of titanium and silicon, and
d. amorphous metal oxide layer deposited between the metal-containing film and the protective layer having the approximate composition Zn.sub.2 SnO.sub.4.