Abstract No.:
2990

 Scheduled at:
Thursday, September 29, 2011, Saal B2.2 10:15 AM
HVOF & Flame Spraying 2


 Title:
Effect of substrate temperature on splat formation of thermally spread polymer on rough surface

 Authors:
Kadhim Alamara* / Swinburne University of Technology, Australia
Christopher Berndt/ Swinburne University of Technology, Australia

 Abstract:
The sprayed splats morphology influences the coating properties, which are determined by the spraying parameters. Substrate surface temperature is shown to be very relevant factor for the splat shape. The influence of surface temperature of rough surface mild steel was investigated for polypropylene (PP) powder particles that were thermally sprayed using flame spray process at different preheated temperatures (i.e. room temperature (RT), 70, 120, 170 °C). The splat morphology was characterized using optical microscopy and scanning electron microscopy (SEM). Micro-Raman spectroscopy was used to examine the effect of the substrate preheating on the molecular structure of the PP splats. This study indicated that increasing the substrate temperature from room temperature to 170 ºC produces PP splats with no delamination, larger diameter and bigger adhesion with substrate. The Raman spectra generally show that the degree of crystallinity of the PP particles rises increasing substrate temperature. This work demonstrates the influence of substrate parameters on the polymer splat morphologies

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