Amorphization and C segregation based surface generation of Reaction-Bonded SiC/Si composites under micro-grinding

Quanli Zhang, Suet To, Qingliang Zhao, Bing Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

Micro-grinding of Reaction-Bonded SiC/Si composites (RB-SiC/Si) were conducted to investigate the surface generation mechanism. The results showed that amorphization occurred for both SiC and Si phases, and C segregation appeared on SiC surface and at the interface of SiC and Si. The surface generation mechanism changed from micro-breaking to smoother surface, but accompanied by formation of many micro-pits at phase boundaries with the decrease of feed rate. It was identified that the material removal mode was closely related to amorphization and C segregation (i.e. amorphization would promote ductile material removal while C segregation would aggravate surface fracture and increase the number of micro-pits). Furthermore, it was found that the distribution of micro-pits corresponded with the random and stochastic properties of diamond grits, and the formation of micro-pits during machining process determined the surface roughness. To explain the mechanism of micro-pits formation, a simple interaction model between diamond grit and workpiece was proposed.
Original languageEnglish
Pages (from-to)78-81
Number of pages4
JournalInternational Journal of Machine Tools and Manufacture
Volume95
DOIs
Publication statusPublished - 9 Jul 2015

Keywords

  • Amorphization
  • C segregation
  • Micro-grinding
  • Micro-pits
  • Surface fracture

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this