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<p>SiC<sub>f</sub>/SiC ceramic matrix composites are critical high-temperature structural materials for aerospace applications due to their exceptional thermomechanical properties. However, machining these composites generates significant quantities of micron-sized chips that migrate with cutting fluids into precision machine components, severely compromising their service life. This study investigates the tribological impact of SiC<sub>f</sub>/SiC chips on GCr15 hardened steel (guideway material) by substituting chips with size distribution-matched SiC abrasive grains. Pin-on-disk wear tests were conducted to analyze the influence of abrasive size on friction coefficients and wear behavior. A single-abrasive wear model was developed using the Lagrangian finite element method, incorporating a modified Archard wear equation as a user-defined subroutine. The results indicate that increasing the abrasive particle size enhances the tribological response of SiCf/SiC composites, which is reflected in a higher coefficient of friction, greater wear volume and increased wear depth. This phenomenon is primarily because larger abrasive particles induce a stronger plowing effect and promote three-body wear, thereby shifting the material removal mechanism from mild wear to macroscopic brittle fracture. Furthermore, such particles significantly exacerbate damage features including plowing grooves and delamination. This work provides theoretical and technical foundations for protecting precision components in SiC<sub>f</sub>/SiC ceramic matrix composites machining processes.</p>

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Wear Mechanism of SiCf/SiC Composite and Effect of Worn Composite Chip Size on Machine Tool Guideway Components

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Chang Song,
  • Yangyang Zhao,
  • Ben Wang,
  • Qiwei Ye,
  • Qi Zhang

摘要

SiCf/SiC ceramic matrix composites are critical high-temperature structural materials for aerospace applications due to their exceptional thermomechanical properties. However, machining these composites generates significant quantities of micron-sized chips that migrate with cutting fluids into precision machine components, severely compromising their service life. This study investigates the tribological impact of SiCf/SiC chips on GCr15 hardened steel (guideway material) by substituting chips with size distribution-matched SiC abrasive grains. Pin-on-disk wear tests were conducted to analyze the influence of abrasive size on friction coefficients and wear behavior. A single-abrasive wear model was developed using the Lagrangian finite element method, incorporating a modified Archard wear equation as a user-defined subroutine. The results indicate that increasing the abrasive particle size enhances the tribological response of SiCf/SiC composites, which is reflected in a higher coefficient of friction, greater wear volume and increased wear depth. This phenomenon is primarily because larger abrasive particles induce a stronger plowing effect and promote three-body wear, thereby shifting the material removal mechanism from mild wear to macroscopic brittle fracture. Furthermore, such particles significantly exacerbate damage features including plowing grooves and delamination. This work provides theoretical and technical foundations for protecting precision components in SiCf/SiC ceramic matrix composites machining processes.