Processing of Turbine Blades Using Cermet Composite Materials
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TECHNICAL ARTICLE—PEER-REVIEWED
Processing of Turbine Blades Using Cermet Composite Materials Hameed H. Ahmed . Adnan Raad Ahmed . Salih Y. Darweesh . Ziad T. Khodair . Mushtaq Abed Al-Jubbori
Submitted: 12 August 2020 / in revised form: 17 September 2020 / Accepted: 19 September 2020 Ó ASM International 2020
Abstract Thermal spraying with flame is one of the distinctive methods in the treatment of turbine blades cracks and oil pipes due to their working conditions. In the current research, a nickel cermet coating (Ni) enhanced by zirconia (ZrO2) with a fixed rate (5%) and different contents of titanium oxide (TiO2) (0, 5, 10, 15, and 20%) was prepared. The contents to be coated were stirred using a locally made stirrer for 2 h. The coating was applied using thermal spraying with flame on 316 L steel surfaces with a fixed spraying distance (15 cm). The thermal treatment of resulting samples was performed at 1000 °C for only 2 h. Moreover, hardness, porosity, adhesion strength, thermal analyses and scanning electron microscope (SEM) were tested. After the sintering process, the results showed that the highest hardness was 789 Hv, the highest adhesion strength was 24 MPa, while the lowest porosity was 9.22%. On the other hand, thermal analyses resulted in a thermal
H. H. Ahmed Ministry of Education, Salah-Alddin Education, Tikrı¯t, Iraq A. R. Ahmed Physics Department, College of Education for Pure Sciences, Tikrit University, Tikrı¯t, Iraq S. Y. Darweesh Physics Department, College of Education Tuzkormato, Tikrit University, Tikrı¯t, Iraq Z. T. Khodair Physics Department, College of Science, University of Diyala, Baqubah, Iraq M. A. Al-Jubbori (&) Department of Physics, College of Education for Pure Sciences, University of Mosul, Mosul 41001, Iraq e-mail: [email protected]; [email protected]; [email protected]
expansion without a steel surface of coating as 18.4 9 106 K1. The SEM images showed a clear blending and cohesion between the cermet components, leading to a significant improvement in the physical and mechanical properties of the cermet coating layers. Keywords Scanning electron microscope (SEM) Thermal diffusivity Vickers hardness Adhesion strength Porosity
Introduction Thermal spraying techniques have occupied an advanced rank in coating processes. They allow the use of a wide range of materials including those of low-melt degrees, high-melt degrees, and composites in order to have well physical and mechanical properties for coating. These techniques are generally among the most important methods used industrially in the processes of surface coating of industrial requirements, especially in the coating of large pieces, with efficiency and high deposition rates. These techniques require high accuracy and control with coating parameters and conditions, such as the rate of material feed, air thrust, and distance between the spray gun and the surface for obtaining coatings with good adhesion strength, as well as high synthetic and mechanical properties [1]. Composite materials
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