Effect of TiO2 Coating on Efficiency of Black Electroless Ni-P Solar Absorber

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Razmjoo Khollari, Mohammad Amin | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 50719 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Ghorbani, Mohammad; Afshar, Abdollah
Abstract:
In this thesis Blackening of electroless nickel-phosphorous coating and the effect of TiO2 anti-reflection coating on optical properties of coating was investigated. In the first step, electroless nickel coatings with different amounts of phosphorous on 1050 aluminium substrate deposited. In second step, blackening of coatings by chemical and electroche-mical methods have studied and in final step, effect of TiO2 antireflection coatings with different amount of Pluronic F127 on the optimum black surface and properties of coating investigated. Chemical blackening performed in nitric acid and effect of acid concenteration, Blackening time and temperature studied. optimized condition was blackining in 9M nitric acid at 50 °C for 40 sec that caused maximum value of solar absorption (99.40 ). The Black layer was composed of NiO and Ni2O3 . Adding an anti-reflection layer on top absorbing layer further enhanced the performance of the absorber and maximum solar absorption (99.86 ) atained when 0.8g of Pluronic F127 was added toTiO2 sol
Keywords:
Titania ; Anti Reflection Coating ; Nickel-Phosphorous Coating ; Titanium Dioxide ; Solar Absorber Coating ; Black Electroless Nickel-Phosphorus

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