Yazar "Sattar, Sabaa" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Corrosion reduction in steam turbine blades using nano-composite coating
    (Elsevier B.V., 2023) Sattar, Sabaa; Alaiwi, Yaser; Radhi, Nabaa Sattar; Al-Khafaji, Zainab; Al-Hashimi, Osamah; Alzahrani, Hassan; Yaseen, Zaher Mundher
    The current study aims to reduce the hot corrosion issues in steam turbines for Al-Mussaib thermal power stations. To gain the aim of the study, many experimental tests were conducted by taking a sample from an existing broken steam turbine blade to identify the alloy composition and preparing samples with exact composition by powder metallurgy method, then using the electro-deposition method to coat the prepared samples by three different coating composite materials consists of TiO2 in different ratios (5, 10 and 15) g/l and 5 g/l SiO2 added to Watt's solution. To verify the efficiency of coating, several tests were conducted (surface roughness, hardness, wear, and oxidation test). The obtained results indicated that increasing the Ni-5%SiO2-TiO2 (5, 10 and 15) g/l caused an increase in the coating thickness, which is compatible with increasing the surface roughness. Also, the sample hardness increased after coating, which returned to increasing TiO2 amount (5, 10 and 15) g/l. However, wear resistance for the samples after coating by selected coating composite and 10 g/l TiO2 amount records the highest reduction in the wear of the sample.
  • [ X ]
    Öğe
    Numerical simulation for effect of composite coating (TIO2+SIO2) thickness on steam turbine blades thermal and stress distribution
    (Editura Politechnica, 2023) Sattar, Sabaa; Alaiwi, Yaser; Radhi, Nabaa Sattar; Al-Khafaji, Zainab
    The steam turbine is the most effective and straightforward method of converting thermal energy into mechanical power. As steam expands, its velocity increases, exerting strong stresses on the turbine blades. The linear motion of the incoming steam with high temp and pressure is converted to rotation of the turbine shaft by the turbine blades. The most important issue in power plants might be corrosion in the turbine blades. Corrosion might cause turbine blade masses to be out of balance, which can cause major vibration issues. The ANSYS software program did a numerical analysis to investigate the impact of coating thickness for the selected coating materials (Ti, TiO2, and SiO2) on the steam turbine. The numerical analysis was done using six coating groups; three of them consist of single materials (Ti, TiO2, and SiO2), and the other three consist of hybrid coating (Ti+ TiO2, Ti+ SiO2, and Ti+TiO2+SiO2) and each group has three coating thickness (0.01, 0.02 and 0.04) μm. Numerical analysis results indicated that the total heat flux and the temp increased after applying the coating. In contrast, total deformation for all selected groups was decreased after applying a coating for all of them; the change in the coating thickness from (0.01 to 0.04) μm has no effective changes on the samples after coating. Using (Ti and TiO2) show a significant increase in max principal stress compared to the uncoated sample. The application of Ti shows the impact of coating thickness on max principal stress, where a change in the coating thickness from 0.01 to 0.04 μm leads to a reduction in the max principal stress value from 1421.9 to 1211.4 MPa.