| Abstrakt: |
Solid particle erosion is a severe problem for a machine working in a sandy environment. Due to this service, life of instruments decreases as comparision to the requirement. In this research, the elemental composition of Ni50Ti50 has been taken to coat mild steel substrate at different substrate preheating temperatures (100, 200, 300 and 400 °C). An atmospheric plasma spraying procedure has been used to spray uniform deposition of NiTi powder on the mild steel substrate. After coating, an x-Ray diffractometer (XRD), scratch tester and scanning electron microscopy (SEM) were applied to measure the surface property. The wear property was investigated by air jet erosion test rig at 45° and 90° impingement angles. Again, the eroded surface morphology was investigated by SEM. Various phases such as NiTi, Ti2Ni, Ni3Ti, Ni4Ti3, Ti2O, TiO2 and NiO are obtained by XRD analysis. NiTi and their intermetallics (such as Ni4Ti3, Ni3Ti, TiO2) play an important role in forming dense splat formation and higher hardness. Several erosion mechanisms were obtained, such as scratches, splat fragmentation and plastic deformation. It was noticed that the erosion rate is relatively low at low substrate preheating temperatures compared to higher preheating temperatures. Scratch wear resistance for low preheating temperature is high as compared to high preheating temperature due to variations of NiTi intermetallic phases on the coating surface. [ABSTRACT FROM AUTHOR] |
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