25 November 1992 Improvements in vacuum collector tubes with graded AI-N/AI absorbing surfaces
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A batch coater for depositing selective absorbing surfaces on the outside of 34 inner tubes was set up using cylindrical magnetron sputtering technique. The appropriate process has been carried out to produce graded Al-N/Al selective absorbing surfaces with optimum optical properties. The average solar absorptance of the surface was found to be about 0. 923 and emittance around 0. 06 ( lOOt),after evacuation. Three evacuation systems of 5 0 tubes each were designed and constructed with automatic evacuation process.The as-produced pressure in the tube in lower than 1 X 1O3Pa.
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Suping Hou, Suping Hou, Zuqing Xue, Zuqing Xue, Yueyan Shi, Yueyan Shi, Zhiqiang Yin, Zhiqiang Yin, } "Improvements in vacuum collector tubes with graded AI-N/AI absorbing surfaces", Proc. SPIE 1727, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows, (25 November 1992); doi: 10.1117/12.130490; https://doi.org/10.1117/12.130490


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