Roughened, Graded-Index, Cermet Photothermal Absorbers With Very High Absorptivities

Glen A. Nyberg; H. G. Craighead; R. A. Buhrman

doi:10.1117/12.933263

12 April 1982 Roughened, Graded-Index, Cermet Photothermal Absorbers With Very High Absorptivities

Glen A. Nyberg, H. G. Craighead, R. A. Buhrman

Proceedings Volume 0324, Optical Coatings for Energy Efficiency and Solar Applications; (1982) https://doi.org/10.1117/12.933263
Event: 1982 Los Angeles Technical Symposium, 1982, Los Angeles, United States

Abstract

Mo/A1₂0₃, composite coatings are shown to be useful in the fabrication of stable, effi-cient, selective solar absorbers. One such absorber deposited at 400°C showed no decrease in its solar absorptivity after 33 days in 500°C air. It was found that a higher substrate temperature during deposition can induce a surprisingly large surface roughness in these co-evaporated Mo/Al₂0₃ composites. This effect, when combined with grading the cermet composition, was used to produce solar absorptivities greater than 0.99 with a calculated thermal emissivity of 0.20 at 500°C, but it also resulted in a decrease in thermal stability in air. Regardless of the degree of surface roughness, all absorbers were stable in vacuum, to 750°C.

Citation Download Citation

Glen A. Nyberg, H. G. Craighead, and R. A. Buhrman "Roughened, Graded-Index, Cermet Photothermal Absorbers With Very High Absorptivities", Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); https://doi.org/10.1117/12.933263

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available