Cermet film selective black absorber

350-1.1 SR

1/26/82 Xr -41312 ^asUnited States Patent [i9]

Fan

[li] 4,312,915 [45] Jan. 26, 1982

[54] CERMET FILM SELECTIVE BLACK ABSORBER

[75] Inventor: John C. C. Fan, Chestnut Hill, Mass.

[73] Assignee: Massachusetts Institute of

Technology, Cambridge, Mass.

[21] Appl. No.: 94,370

[22] Filed: Nov. 15,1979

Related U.S. Application Data

[63] Continuation of Ser. No. 873,434, Jan. 30, 1978, abandoned, which is a continuation-in-part of Ser. No. 624,701, Apr. 7, 1976, abandoned.

[51] Int. C1.3 B32B 5/16; B32B 15/04;

F24J 3/02

[52] U.S. Q 428/323; 126/417;

350/1.1; 350/1.6; 350/1.7; 427/160; 427/376.3; 428/328; 428/333; 428/469; 428/472; 428/913

[58] Field of Search 29/195 M; 106/58, 59,

106/66; 126/270, 271, 417; 350/1.1, 1.6, 1.7; 427/34, 160, 162, 376 B, 376.2, 376.3, 376.4, 376.5; 428/212, 215, 469, 472, 913, 216, 323,

328, 332, 333

[56] References Cited

U.S. PATENT DOCUMENTS

2,775,531 12/1956 Montgomery et al 428/469 X

3,069,759 12/1962 Grant et al 29/182.5

3,272,986 10/1966 Schmidt 350/1

3,990,860 11/1976 Fletcher et al 428/472 X

4,006,278 2/1977 Pukaite 428/472 X

A selective-black absorber capable of operation at elevated temperatures and high efficiency as a solar energy absorber is described. A cermet of MgO/Au, MgO/Pt, and ... having high solar energy absorptance and low infrared energy emissivity is coated on a substrate having high infrared reflectivity such as Mo coated on stainless steel; Ni coated on Cu, or steel; aluminum, or steel. Typically an absorption coefficient of about 0.93 with an emissivity of about 0.09 is obtained and operation at a temperature of 300°-400° C. is possible depending on the cermet and substrate materials.

24 Claims, 9 Drawing Figures