• CN:11-2187/TH
  • ISSN:0577-6686

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

• 论文 • 上一篇    下一篇

高速电弧喷涂Fe-Al涂层在高温磨损中的摩擦氧化行为

朱子新;徐滨士;马世宁;张伟;刘维民   

  1. 装甲兵工程学院再制造技术国防科技重点实验室;中国科学院兰州化学物理研究所固体润滑国家重点实验室
  • 发布日期:2004-11-15

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

摘要: 采用滑动磨损试验方法,研究从室温(23 °C)至650 °C高速电弧喷涂Fe-Al金属间化合物涂层的摩擦氧化行为。结果表明,高温下Fe-Al涂层滑动摩擦因数降低的主要原因是磨损面发生摩擦氧化反应,形成了具有固体润滑作用的氧化物保护层,该保护层由Al2O3、Fe3O4及Fe2O3组成。氧化物保护层形成的机制是磨屑的动态氧化和微区热压烧结。涂层的扁平颗粒在摩擦磨损过程脱落成为磨屑;随着滑动摩擦磨损的进行,在Si3N4球的反复碾压及摩擦热的共同作用下,磨屑将不断地发生断裂、碎化及动态氧化而成为氧化物粉状屑,并通过微区热压烧结方式形成氧化物层,覆盖于磨损涂层表面。在高温下Fe3Al和FeAl金属间化合物相具有较高的强度和硬度,能有效地抵抗较高硬度的Si3N4球的压入及微犁削,使磨损面上的氧化物保护层不易开裂和脱落。

关键词: Fe-Al, 高速电弧喷涂, 高温磨损, 摩擦氧化, 涂层, 氧化物保护层

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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