γ_N相/Si_3N_4陶瓷球摩擦副在干摩擦条件下的磨损机制转变图

Wear Mechanisms Transition Map of the γ_N Phase under Dry Sliding against Si_3N_4 Ceramic Counterface

采用等离子体源渗氮技术在AISI 316奥氏体不锈钢表面制备γN相层.研究了γN相层/Si3N4陶瓷球摩擦副在球-盘式磨损仪、载荷2-8 N、滑动速度0.15-0.22 m/s干摩擦条件下的磨损行为,基于详细的磨痕表面和磨屑显微分析,通过响应面分析法建立γN相层在此状态下的磨损机制转变图.结果表明：γN相层在低载荷下的磨损机制主要是氧化磨损;而在较高载荷下的磨损机制主要是塑性变形和磨粒磨损.

A single high-nitrogen face-centered-cubic （f.c.c.） phase （γN） layer was prepared by plasma source nitrided AISI 316 austenitic stainless steel. Tribological behavior of the γN phase layer against an Si3N4 ceramic counterface was investigated using a ball-on-disc tribometer under a normal load varying from 2 to 8 N and a sliding speed varying from 0.15 to 0.29 m/s without lubrication. Based on the detailed microanalyses for the worn surface and wear debris, the wear map of the YN phase layer was constructed under these experimental conditions using the response surface methodology. The results show that the oxidative wear was the main wear mechanism for the γN phase layer at the lower normal load. Nevertheless, the plastic deformation and the abrasive wear observed under the higher normal load.