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1352 |
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Monday, June 02, 2008, Room 04 2:20 PM Wear Protection 2 Special processes for coatings against wear, improved surface roughness of as sprayed coatings, improved sliding behavior |
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Erosion, abrasive and friction wear behavior of iron aluminide coatings sprayed by HVOF |
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Sergi Dosta / Thermal Spray Centre (CPT) - Universitat de Barcelona, SPAIN J.M. Guilemany / Thermal Spray Centre (CPT), Spain N. Cinca*/ Thermal Spray Centre (CPT), Spain S. Sampath/ Center for Thermal Spray Research. , USA |
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Iron aluminides have been lately proposed as promising materials for wear applications. Many authors have focused their investigations on the friction behaviour of FeAl coatings emphasizing the role of this intermetallic as a new matrix to embed ceramic particles and substitute the extensively studied WC-Co cermet system. However, few works deal with the evaluation of the different tribological properties and their relationship with the coating microstructure. Thus, in the present study, the near stoichometric Fe40Al was successfully sprayed by means of HVOF obtaining the FeAl, alpha-Fe and FeAl2O4 phases and the tribological behaviour was assessed using solid particle erosion, abrasive and dry sliding tests. The wear mechanisms that take part in each test are discussed with regard to the obtained results. The erosion tests evaluate the wear rate by the impact of alumina particles and the remaining groove was examined. The friction coefficient versus sliding distance was obtained in the ball-on-disc test for 5, 10 and 15 N. In addition, isothermally treated samples in air were tested showing both lower friction coefficient and lower wear rate. The as-sprayed coatings were characterized by Scanning Electron Microscopy (SEM) and Microhardness indendation. The worn surfaces were also examined using SEM-EDS and for the wear tracks, Scanning White Light Interferometry was used giving the surface profile. |