Absorption surface of solar collector

Details Absorption surface of solar collector Absorption surface of solar collector

1976-08-18

1978-06-27

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 614R, 148 615R, 148 635, 148 315, 427 34, 427162, 427248R, 204192SP, 204192P, 428472, 428913, C23F 704

Patent

active

040973115

ABSTRACT:
The present invention relates to a selective absorption surface of a solar collector in which a coating layer consisting of the predetermined composition of metal oxide is tightly adhered to a substrate having the mirror-like surface in the predetermined thickness.
The composition of metal oxide consists of those comprising 0.001 - 0.15 wt % of C, 0.005 - 3.00 wt % of Si, 0.005-10.00 wt % of Mn, 11.00 - 30.00 wt % of Cr, 0.005 - 22.00 wt % of Ni, optionally, 0.75 - 5.00 wt % of Mo and the balance being Fe or those comprising instead of Cr, 0.001 - 5.0 wt % of at least one of metals selected from the group of N, Cu, Al, V, Y, Ti, Nb, Ta, U, Th, W, Zr, and Hf, the atom ratio of Metal/Carbon + additional element being more than 5.0. An acidic oxidation method and an alkaline oxidation method are applied to manufacture oxide of the metal compositions.
It has been observed that the superior selective absorption surface showing high energy absorption factor at a wave length of 0.3 - 2.5 .mu.m and low energy radiative factor at a wave length of 3 -50 .mu.m is manufactured by coating said oxide of the metal composition at a thickness of 500 - 2000 A on the base plate having the mirror-like surface of arithmetical mean deviation (Ra) less than 0.07.mu. or ten point height (RZ) less than 0.2.mu. determined according to the method of ISO Recommendation R 468.

REFERENCES:
patent: 2394899 (1946-02-01), Clingan
patent: 2528717 (1950-11-01), Batcheller
patent: 3125471 (1964-03-01), Conner
patent: 3210220 (1965-10-01), Clegg
patent: 3915759 (1975-10-01), Smollett et al.
patent: 3963530 (1976-06-01), Smollett et al.

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