• CN: 11-2187/TH
  • ISSN: 0577-6686

›› 2004, Vol. 40 ›› Issue (11): 163-168.

• Article • Previous Articles     Next Articles

FRICTION INDUCED OXIDATION BEHAVIOR OF HIGH VELOCITY ARC SPRAYED Fe-Al COATINGS DURING HIGH TEMPERATURE WEAR

Zhu Zixin;Xu Binshi;Ma Shining;Zhang Wei;Liu Weimin   

  1. National Key Laboratory of Remanufacturing, Academy of Armored Forces Engineering State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science
  • Published:2004-11-15

Abstract: The friction induced oxidation behavior of Fe-Al intermetallic coating during high temperature sliding wear from room temperature to 650 °C is investigated using a ball-on-disc tribotester. The coatings are deposited onto 20g low carbon steel substrates using high velocity arc spraying and cored wires. The results indicate that the decrease of friction coefficient with the increased temperature is caused by the development of protective oxide layers (composed by Al2O3、Fe3O4 and Fe2O3) on the worn surface during sliding wear, which act as a solid lubricant. And dynamic oxidation and hot pressed thermal sintering of wear particle are formation mechanisms of the protective oxide layers. The splats on the wear track delaminate firstly and turn into wear particles during sliding wear; after wear particle breaking-up, dynamic oxidization, and oxide powders formation under rolling and friction heat, the protective oxide layers are formed by hot pressed thermal sintering and coated on the sliding surface. The Fe3Al and FeAl intermetallics with higher strength and hardness at elevated temperatures in the coating can effectively resist the pressing-in and micro-plowing of Si3N4 ball, thus the protective oxide layers on the worn surface are not easy to scale off.

Key words: Coating, Friction induced oxidation, High temperature wear, High velocity arc spraying, Iron-aluminide, Protective oxide layer

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