Diamond powder was coated with a SiC layer by a rotary chemical vapour deposition (RCVD) technique. The SiC layer thickness varied from 15 to 120 nm, depending on the diamond particle size and coating time. The SiC-coated diamond powder was consolidated with 35 wt.% SiO2 by spark plasma sintering (SPS) at 1773-1973 K for 300 s under 100 MPa pressure. The effects of SiC coating, diamond particle size (2μm and 7 μm), and sintering temperature on the densification behaviour were investigated. The diamond/SiO2 composite using SiC-coated diamond powder exhibited higher density than those using uncoated diamond powder. The highest density and Vickers hardness were 99% and 34 GPa, respectively.
- Rotary chemical vapour deposition
- Spark plasma sintering
ASJC Scopus subject areas
- Materials Science(all)