الفهرس 
Chapter1 : IntroductionOnly 14 pages are availabe for public view
 |  | from | 190 |  |  |
| | | from | 190 | | |
Abstract
All projects in Egypt desert are those with a variety of water sources need to water pumping systems to provide the necessary and extractable quantities to the needs of agricultural and urban communities. The most of the projects areas that are located in the desert leads to mixing the sand with water by wind , leading to the erosion (Wear) in the water pumping and transfer systems where cause damage and short life and low efficiency of systems. . Advanced surface treatments and coatings enable the repair of rotating equipment’s critical parts at a reduced cost. This study focuses on new fabrication Epoxy /Co Zn ferrite nanocomposite coating to be applied in water pumping system. This study focuses on the effect of surface coating on the impellers in improving the pumps efficiency under effect of erosion media. The study consists of several stages to achieve the desired goals and the study is generally target in the control of the properties of nanoparticles, which are the main part in the study. The first stage is: ”Preparation and characterization of Co_(1-x ) Zn_x Fe_2 O_4 nanoparticles to get optimum material properties to be used in different application. The first stage can be divided in two steps: Step one is preparation and characterization of Co_(0.3 ) Zn_0.7 Fe_2 O_4 nanoparticles by co-precipitation method within two techniques based on different in initial molar concentration (pH suspension) and calcination temperature. Step two: choose the best technique for the production of nanoparticles” Preparation and characterization of the Co_(1-x ) Zn_x Fe_2 O_4 nanoparticles by co-precipitation Method. After studying the properties of all the samples produced will be best choice in terms of sample characteristics and objectives of the application and move on to the second stage, namely: ”Preparation and characterization of Zn Epoxy /Co Zn ferrite Nano Composite coating”. The best ones will be chosen in addition to the proportion of samples which represent the type of nanocomposite coatings produced through the previous stages. Next step is to assess the nanocomposite coating product in the application which is about: ” Evaluations of Zn Epoxy /Co Zn ferrite nanocomposite coating effect on water pumping system under erosion effect” .In this stage performance testing was conducted in the same pump with coated impellers ( by nanocomposite and Zn/Epoxy) and without coating. The results showed that, in first stage, all laboratory results reveals that the initial molar concentration (pH suspension) and the calcination temperature play a major role to change its structural and magnetic properties significantly. The crystallinity of Co_(0.3 ) Zn_0.7 Fe_2 O_4nanoparticles might be improved by increasing calcination temperature. Also it is found that, the crystallinity for second technique better than first technique at 600°C. The Zn concentration play a major role to change the structural and magnetic properties of nanomaterial significantly, so the experiential results refer to the C4 (Co_(0.5 ) Zn_0.5 Fe_2 O_4 at 600°C) is better sample in magnetic and structure properties with super-paramagnetic behaviour. In second stage, the results of mechanical properties show that at 2% concentration of Co_(0.5 ) Zn_0.5 Fe_2 O_4 nanoparticles in zinc epoxy is best addition percentage. Also, the results showed that nanocomposite coating improves the performance curve and decrease effect of erosion on pump.