SiO 2 nanolayer coated cubic boron nitride (cBN), cBN(core)/SiO 2 (shell) powder, was prepared by rotary chemical vapor deposition. The cBN/SiO 2 powder was densified by spark plasma sintering at 1873K for 0.3ks. The hexagonal boron nitride (hBN) phase was not observed in the cBN-SiO 2 composites, indicating that the SiO 2 nanolayer depressed the phase transformation from cBN to hBN. The relative density of cBN-SiO 2 increased with increasing SiO 2 content (CSiO2). The highest hardness of the cBN-SiO 2 composite was 17.5GPa at CSiO2=38 wt% and a load of 0.98N.
- Cubic boron nitride (cBN)
- Rotary chemical vapor deposition
- Spark plasma sintering
ASJC Scopus subject areas
- Ceramics and Composites