Preparaion and Tribological Behavior of Flame-Sprayed PA1010 Coatings

PA1010 coatings were prepared on AISI-1045 steel substrate by flame-spraying. The PA1010 powders as the raw material and its flame-sprayed coating on the steel were analyzed by means of Fourier transformation infrared spectroscopy and X-ray diffraction, while their thermal degradation and oxidation behaviors were comparatively investigated by means of differential scanning calorimetry. The friction and wear behavior of the resulting PA1010 coating sliding against stainless steel in a block-on-ring configuration was examined on an MM-200 friction and wear tester. The morphologies of the worn coating surface and the counterpart steel ring were observed on a scanning electronmicroscope. It was found that the PA1010 powders did not experience degradationand oxidation during the flame spraying process. The flame-sprayed PA1010 coating had a larger crystallinity than the PA1010 powders, which contributed to increase the wear-resistance of the coating. The friction and wear behavior of the PA1010 coating was closely dependent on the applied normal load, which was attributed to the significant effect of the normal load on the transfer of the PA1010 onto the couterpart surface and its transfer-film-formation thereon. The flame-sprayed PA1010 coating was dominated by mild adhesion as it slid against the stainless steel ring at a small load, while it was characterized by severe adhesion and plastic deformation at a large load.