The coefficient of friction (COF) is affinitive related to the microstructure and mechanical characteristic of surface. In this study, different compositional thermal spray NiAl coating is designed to increase the sur...The coefficient of friction (COF) is affinitive related to the microstructure and mechanical characteristic of surface. In this study, different compositional thermal spray NiAl coating is designed to increase the surface friction effect. The contour analysis of surface, surface hardness test and SEM observation showed that the coarsen process is varied with microstructure of coating surface. Under the same friction conditions, adhesive wear mechanism is the main process on Ni-5wt%Al coating and accompanied with plowing effect other than the Ni-20wt%Al coating was accompanied with abrasive wear mechanism during wear. It is also found that there is a different change in COF for Ni-5wt %Al and Ni-20wt%Al coating. At the beginning, Ni-20wt%Al coating could keep higher coefficient of surface friction than Ni-5wt%Al coating. However, with the increase of wear cycles, the COF of Ni-5wt%Al coating is rise slowly at the cost of low wear resistance and gradually closed to the Ni-20wt%Al coating.展开更多
基金Fundamental Research Funds for the Central Universities (ZXH 2009-C003)the Starting Research Project of Civil Aviation University of China
文摘The coefficient of friction (COF) is affinitive related to the microstructure and mechanical characteristic of surface. In this study, different compositional thermal spray NiAl coating is designed to increase the surface friction effect. The contour analysis of surface, surface hardness test and SEM observation showed that the coarsen process is varied with microstructure of coating surface. Under the same friction conditions, adhesive wear mechanism is the main process on Ni-5wt%Al coating and accompanied with plowing effect other than the Ni-20wt%Al coating was accompanied with abrasive wear mechanism during wear. It is also found that there is a different change in COF for Ni-5wt %Al and Ni-20wt%Al coating. At the beginning, Ni-20wt%Al coating could keep higher coefficient of surface friction than Ni-5wt%Al coating. However, with the increase of wear cycles, the COF of Ni-5wt%Al coating is rise slowly at the cost of low wear resistance and gradually closed to the Ni-20wt%Al coating.
