پديد آورنده :
حسيني نجف آبادي، مهدي
عنوان :
ايجاد پوشش الكترولس نيكل- فسفر سياه و بهينه سازي خواص نوري آن
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي و انتخاب مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
ده،151ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
فخرالدين اشرفي زاده، محمود منير واقفي
استاد مشاور :
علي اكبر عالم رجبي
توصيفگر ها :
پوشش جاذب نورخورشيد , عمليات حرارتي , نانو تيوب كربني
تاريخ نمايه سازي :
24/7/89
استاد داور :
احمد ساعتچي، علي شفيعي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
161 Formation of Electroless black nanostructure Ni coatings and optimization of optical properties Mehdi Hosseini Najafabadi Email address m najafabadi@ma iut ac ir Date of Submission 2010 05 1 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor s Name Fakhreddin Ashrafizadeh Professor ashrafif@cc iut ac ir Mahmood Monirvaghefi Associate Professor vagh mah@cc iut ac ir Ali Akbar Alemrajabi Associate Professor rajabi@cc iut ac ir Abstract In this thesis high solar absorber coatings of Ni P on aluminum substrate have been fabricated by electroless technique as an alternative to sophisticated PVD coatings For this purpose nickel phosphorus coating was deposited on commercially pure aluminum and then blacking process was carried out The effect of various parameters on microstructure hardness adhesion optical properties and durability of the coatings was studied These parameters were phosphorous content heat treatment substance s roughness thickness of coating blackened acid and CNT The phase structure of the coatings was studied by X ray diffraction the crystallite size measured by using Sherrer method indicated an average crystallite size of about 15 nm with an increase in hardness Microstructural examinations of the coatings were performed by scanning electron microscopy The coatings generally had sound crack free surfaces The topography of the coatings was studied by Atomic force microscopy The optical properties of the coatings were determined by means of spectrophotometer and FTIR Absorption and emission coefficients of the coatings were measured in range of 0 3 1 7 m and 2 5 25 m respectively The ultra high absorption of the coatings is associated with unique surface morphology and formation of nickel oxides NiO Ni2O3 and some nickel phosphate The surface morphology consisting of a dense array of microscopic conical pores perpendicular to the surface This structure produce by selective etch act as light traps is capable of absorbing over 98 light in solar region The results indicated that after heat treatment emission coefficient was decreased CNTs improved absorption and emission of the coatings Emission coefficient of coating was 0 34 while after embed CNTs it reduced to 0 22 Prepared samples were subjected to an accelerated lifetime test In the test procedure the temperature of the environment was set to 40 C and the relative humidity to 95 Durability test showed that high phosphorous coatings had good long term optical performance The results of this study indicate that the coating process described here is a good method to produce solar absorber coatings on aluminium Keywords Solar absorber coating Electroless nickel Optical properties Heat treatment Carbon nano tube
استاد راهنما :
فخرالدين اشرفي زاده، محمود منير واقفي
استاد مشاور :
علي اكبر عالم رجبي
استاد داور :
احمد ساعتچي، علي شفيعي
