Friction Load Sensitivity of CoCrFeNi Doped DLC Films

doi:10.3901/JME.2025.10.117

Abstract

Abstract: Diamond-like carbon(DLC) films have been widely used in industry as a solid self-lubricating coating with excellent performance. However, under high frictional load conditions, DLC films are often limited by high residual stresses and insufficient toughness. In order to improve the serviceability of the films under high frictional loads, DLC films with different CoCrFeNi high entropy alloy doping are prepared on 304 stainless steel substrate by non-equilibrium ion beam assisted enhanced magnetron sputtering technique and their microstructure, nanomechanical properties, frictional wear characteristics and mechanisms are investigated. The results show that with the increase of CoCrFeNi doping, the sp² hybridized carbon content in the DLC films increased, the ID/IG value at the surface of the films increases from 1.27 to 2.33, and the G peak increases from 1 540 cm^-1 to 1 558 cm^-1. At the same time, the internal stress decreases from 1.51 GPa to 0.64 GPa. In terms of micro-and nano-mechanical properties, the hardness and Young’s modulus of the films remain stable at a doping target current of 0.6 A, and their friction coefficients and wear rates show optimal friction reduction and wear resistance. However, when the doping target current exceeds 0.6 A, the excessive doping leads to the structural damage of the films, and the mechanical and tribological properties show a significant decrease.

Key words: diamond-like films, nanomechanical properties, loading, tribological behavior

CLC Number:

TH117
TB383

ZHANG Weiyao, HAN Shichao, MA Sanbao, LI Zhen, CHEN Zhuchi, ZHAO Haichao, MA Guozheng, ZHOU Yefei. Friction Load Sensitivity of CoCrFeNi Doped DLC Films[J]. Journal of Mechanical Engineering, 2025, 61(10): 117-127.

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