# US 4,397,671 A · Method of placing a metal oxide film on a surface of a heated glass substrate

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- Number: US 4,397,671 A
- Document ID: US4397671A
- Status: Granted
- Kind: A
- Application number: 06/434,642
- Filed: 1982-09-20
- Granted: 1983-08-09
- Earliest claimed: 1981-11-30
- Assignees: Ford Motor Company
- Inventors: Sandy T. S. Vong
- Web page: https://patentgrep.com/patent/US4397671A

## CPC

- C03C 17/23: Oxides (C03C17/02 takes precedence)
- C03C 2217/21: Oxides
- C03C 2218/17: from a solid phase
- 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 method of placing a metal oxide film on a surface of a heated glass substrate (16) is disclosed. The glass substrate is one which is being moved in a selected direction from a glass manufacturing process (20) and is one which would have a temperature in a range from 700.degree.-1200.degree. F. (370.degree.-650.degree. C.). The method is accomplished by spraying a heat decomposable, organic based metal salt onto the glass ribbon. The spray powder is delivered by means of a gaseous stream to a location spaced above the moving substrate. The spray powder is then accelerated from the location spaced above the moving glass substrate. The acceleration is accomplished by entraining the spray powder in a high velocity stream of air. The accelerated spray powder is directed downwardly toward the moving glass substrate and longitudinally along the selected direction of movement of the glass substrate. Individual particles of the spray are either vaporized, decomposed and reacted with oxygen to form a tightly adherent coating on the glass substrate, or they are rapidly exhausted.

## Claims

### Claim 1

A method of placing a metal oxide film on a surface of a heated glass substrate which is being moved in a selected direction from a glass manufacturing process, the method comprising the steps of:
delivering a spray powder by means of a gaseous stream to a location spaced above said moving glass substrate, said glass substrate having a temperature in a range from 700.degree. F. (370.degree. C.) to 1200.degree. F. (650.degree. C.), said spray powder having individual particles with a size in a size range from 0.05 microns to 50 microns formed from organic based metal salts which are heat decomposable;
accelerating said spray powder from said location spaced above said moving glass substrate, said acceleration being accomplished by entraining said spray powder in a high velocity stream of air which causes individual particles of said spray powder both to be accelerated to velocities in a range of from 20 feet per second (6 meters per second) to 250 feet per second (76.2 meters per second) and to separate said individual particles of spray powder; and
directing said accelerated spray powder entrained in said high velocity stream of air in directions which fan outwardly, both downwardly toward said moving glass substrate and longitudinally along said selected direction of movement of said glass substrate whereby separated, individual particles of said spray powder are either rapidly brought to a location in juxtaposition to said surface of said glass substrate whereat said individual particles of said spray powder are vaporized, decomposed and reacted with oxygen to form a tightly adherent coating on said glass substrate, or are rapidly exhausted from said location in juxtaposition to said surface of said glass substrate because said individual particles fail to vaporize, decompose or react within an acceptable residence time required for forming a tightly adherent coating on said moving glass substrate.

### Claim 2

A method of placing a metal oxide film on a surface of a heated glass substrate which is being moved in a selected direction from a glass manufacturing process, the method comprising the steps of:
preparing a spray powder having individual particles with a size in a size range from 0.05 microns to 50 microns, said spray powder being formed from organic based metal salts which are heat decomposable;
delivering said spray powder by means of a gaseous stream to a location spaced above said moving glass substrate, said glass substrate having a temperature in a range from 700.degree. F. (370.degree. C.) to 1200.degree. F. (650.degree. C.);
accelerating said spray powder from said location spaced above said moving glass substrate, said acceleration being accomplished by entraining said spray powder in a high velocity stream of air which causes individual particles of said spray powder both to be accelerated to velocities in a range of from 20 feet per second (6 meters per second) to 250 feet per second (76.2 meters per second) and to separate said individual particles of spray powder; and
directing said accelerated spray powder entrained in said high velocity stream of air in directions which fan outwardly, both downwardly toward said moving glass substrate and longitudinally along said selected direction of movement of said glass substrate whereby separated, individual particles of said spray powder are either rapidly brought to a location in juxtaposition to said surface of said glass substrate whereat said individual particles of said spray powder are vaporized, decomposed and reacted with oxygen to form a tightly adherent coating on said glass substrate, or are rapidly exhausted from said location in juxtaposition to said surface of said glass substrate because said individual particles fail to vaporize, decompose or react within an acceptable residence time required for forming a tightly adherent coating on said moving glass substrate.

### Claim 3 (depends on 2)

The method of claim 2, wherein said acceptable residence time is a time period from 0.02 to 0.3 seconds.

### Claim 4

A method of placing a metal oxide film on a surface of a heated glass substrate which is being moved in a selected direction from a glass manufacturing process, the method comprising the steps of:
preparing a spray powder having individual particles with a size in a size range from 2 microns to 15 microns, said spray powder being formed from organic based metal salts which are heat decomposable;
delivering said spray powder by means of a gaseous stream to a location spaced above said moving glass substrate, said glass substrate having a temperature in a range from 700.degree. F. (370.degree. C.) to 1200.degree. F. (650.degree. C.);
accelerating said spray powder from said location spaced above said moving glass substrate, said acceleration being accomplished by entraining said spray powder in a high velocity stream of air which causes individual particles of said spray powder both to be accelerated to velocities in a range of from 180 feet per second (55 meters per second) to 220 feet per second (67.2 meters per second) and to separate said individual particles of spray powder; and
directing said accelerated spray powder entrained in said high velocity stream of air in directions which fan outwardly, both downwardly toward said moving glass substrate and longitudinally along said selected direction of movement of said glass substrate whereby separated, individual particles of said spray powder are either rapidly brought to a location in juxtaposition to said surface of said glass substrate whereat said individual particles of said spray powder are vaporized, decomposed and reacted with oxygen to form a tightly adherent coating on said glass substrate, or are rapidly exhausted from said location in juxtaposition to said surface of said glass substrate because said individual particles fail to vaporize, decompose or react within an acceptable residence time required for forming a tightly adherent coating on said moving glass substrate.

### Claim 5 (depends on 4)

The method of claim 4, wherein said acceptable residence time is a time period from 0.02 to 0.3 seconds.