# US 2014/0193647 A1 · Coatings for solar applications

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- Number: US 2014/0193647 A1
- Document ID: US20140193647A1
- Status: Published application
- Kind: A1
- Application number: 14/006,142
- Filed: 2012-03-25
- Published: 2014-07-10
- Earliest claimed: 2011-03-24
- Assignees: Bengurion University of the Negev Research and Development Authority
- Inventors: Jacob Hormadaly
- Web page: https://patentgrep.com/patent/US20140193647A1

## CPC

- C03C 8/16: with vehicle or suspending agents, e.g. slip
- C03C 8/18: containing free metals
- C03C 8/20: containing titanium compounds; containing zirconium compounds
- C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D 5/32: Radiation-absorbing paints {(protection against X-, gamma- or corpuscular radiation G21F)}
- F24S 70/225: for spectrally selective absorption
- C03C 2207/04: for steel
- F24S 20/20: Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
- Y02B 10/20: Solar thermal
- Y02E 10/40: Solar thermal energy, e.g. solar towers
- 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
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- F24S: SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS (for producing mechanical power from solar energy F03G6/00)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention discloses coating compositions comprising: I) at least one highly absorbing material selected from the group consisting of ruthenium, iridium and osmium compounds, and mixtures thereof; II) an inorganic glass binder or a precursor thereof; III) a ceramic filler comprising metal oxides, metal powders and mixtures thereof; and V) a liquid organic vehicle. The invention further discloses methods for preparing these coatings and uses thereof in solar applications.

## Claims

### Claim 1

A coating composition comprising:
I) at least one highly absorbing material selected from the group consisting of ruthenium, iridium and osmium compounds, and mixtures thereof;
II) an inorganic glass binder or a precursor thereof;
III) a ceramic filler comprising metal oxides, metal powders and mixtures thereof; and
IV) a liquid organic vehicle.

### Claim 2 (depends on 1)

The composition of claim 1, wherein said highly absorbing material contains one or more Ru compounds.

### Claim 3 (depends on 1)

The composition of claim 1, wherein said highly absorbing material ranges from 7 to 30% weight.

### Claim 4 (depends on 2)

The composition of claim 2, wherein said Ru compound is selected from RuO2, BaRuO3, and pyrochlore-like Ru compounds, or mixtures thereof.

### Claim 5 (depends on 1)

The composition of claim 1, wherein said inorganic glass binder is selected from boroaluminosilicates of Na, K, Li, Ca, Sr, Mg, Ba, with or without transition metals oxides.

### Claim 6 (depends on 1)

The composition of claim 1, wherein said precursor of said silicon dioxide binder is a silicon resin selected from polydimethylsiloxanes, polymethydro-dimethylsiloxane copolymer, vinyl terminated silicone polymers and vinyl backbone silicone polymers.

### Claim 7 (depends on 1)

The composition of claim 1, wherein said inorganic glass binder or said precursor thereof ranges from 15 to 55% weight.

### Claim 8 (depends on 1)

The composition of claim 1, wherein said liquid organic vehicle is selected from aliphatic alcohols or esters thereof, terpens, terpineols, solutions of resins.

### Claim 9 (depends on 1)

The composition of claim 1, wherein the amount of said liquid organic vehicle ranges from 25% weight to 50% weight of the total weight of the composition.

### Claim 10 (depends on 1)

The composition of claim 1, wherein the amount of said ceramic filler ranges from 0.1% weight to 30% weight of the total weight of solids dispersed in said composition.

### Claim 11 (depends on 1)

The composition of claim 1, comprising from 1 to 99.5% weight RuO2, from 5 to 80% weight glass particles, from 0.1% weight to 30% weight of said ceramic filler and from 10% weight to 50% weight of said liquid organic vehicle.

### Claim 12 (depends on 1)

The composition of claim 1, wherein said ceramic filler contains from 0.1 to 12.0% weight Co3O4; from 0.1 to 12.0% weight Nb2O5; and from 0 to 12.0% weight ZrO2.

### Claim 13 (depends on 12)

The composition of claim 12, wherein said ceramic filler optionally further contains up to 20% silver powder.

### Claim 14 (depends on 1)

The composition of claim 1, being in the form of a paste or a paint.

### Claim 15 (depends on 1)

A method of coating a metal substrate, said method comprising applying the coating composition of claim 1 on a metal substrate, and curing said composition by heating thereof.

### Claim 16 (depends on 15)

The method of claim 15, wherein said metal substrate is selected from a solar tower coated parts which are exposed to concentrated solar power, a trough pipe, a stirling engine or a domestic solar collector.

### Claim 17 (depends on 15)

The method of claim 15, wherein said metal substrate is composed of a carbon steel, stainless steel, Inconel™ and super alloys.

### Claim 18 (depends on 17)

The method of claim 17, wherein said heating is conducted by firing said composition.

### Claim 19 (depends on 17)

The method of claim 17, wherein said heating is conducted by naturally curing said composition.

### Claim 20 (depends on 19)

The method of claim 19, wherein said heating is conducted at a temperature which is lower than 750° C.

### Claim 21

A metal substrate coated by a ceramic coating, said coating comprising at least one highly absorbing material selected from the group consisting of ruthenium, iridium and osmium compounds, and mixtures thereof, crystallized glass, and one or more a ceramic filler comprising metal oxides, metal powders and mixtures thereof.

### Claim 22

A solar absorber coated by a ceramic coating, said coating comprising at least one highly absorbing material selected from the group consisting of ruthenium, iridium and osmium compounds, and mixtures thereof, crystallized glass, and one or more a ceramic filler comprising metal oxides, metal powders and mixtures thereof.