# US 4,394,415 A · Electromagnetic wave energy absorbing material

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- Number: US 4,394,415 A
- Document ID: US4394415A
- Status: Granted
- Kind: A
- Application number: 06/390,192
- Filed: 1982-06-21
- Granted: 1983-07-19
- Earliest claimed: 1981-08-05
- Inventors: Shunji Tsuda
- Web page: https://patentgrep.com/patent/US4394415A

## CPC

- C25D 11/20: Electrolytic after-treatment
- F24S 70/25: Coatings made of metallic material
- Y02B 10/20: Solar thermal
- Y02E 10/40: Solar thermal energy, e.g. solar towers
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An electromagnetic wave energy absorbing material for use in a solar energy industry, which absorbs effectively the energy of an electromagnetic wave such as the sunlight, is disclosed. This energy absorbing material comprises an aluminum material such as an aluminum simple substance and an aluminum alloy having a microporous aluminum oxide layer having a thickness of 0.1-1.4 .mu.m on its surface, and 0.05-1.5 g/m.sup.2 of at least one of elements selected from the group consisting of cobalt, silver, lead, molybdenum, copper, chromium, selenium, silicon, germanium, iron, manganese, nickel, zinc, tin and palladium is deposited in the micropores of the microporous aluminum layer.

## Claims

### Claim 1

An electromagnetic wave energy absorbing material comprising an aluminum material having a microporous aluminum oxide layer having a thickness of 0.1-1.4 micron on its surface, wherein 0.05-1.5 g/m.sup.2 of at least one of elements of metals and semiconductors selected from the group consisting of cobalt, silver, lead, molybdenum, copper, chromium, selenium, silicon, germanium, iron, manganese, nickel, zinc, tin and palladium is contained in the micropores of the microporous aluminum oxide layer.

### Claim 2 (depends on 1)

An electromagnetic wave energy absorbing material as defined in claim 1, wherein the aluminum material is an aluminum simple substance.

### Claim 3 (depends on 1)

An electromagnetic wave energy absorbing material as defined in claim 1, wherein the aluminum material is an aluminum alloy.

### Claim 4 (depends on 1, 2, 3)

An electromagnetic wave energy absorbing material as defined in claims 1, 2 or 3, wherein the thickness of the microporous aluminum oxide layer of the aluminum material is in a range of 0.1-0.9 micron.