Abstract
Cubic boron nitride (cBN) powder was coated with Ni nanoparticle and SiO 2 nanolayer (abbreviated as cBN/Ni and cBN/SiO 2, respectively) by rotary chemical vapor deposition (RCVD), and compacted with SiO 2 powder by spark plasma sintering at 1473-1973 K for 0.6 ks. The effects of Ni and SiO 2 coatings on the densification, phase transformation of cBN and hardness of SiO 2-cBN composites were compared. The phase transformation of cBN to hBN was identified at 1973 K in SiO 2-cBN/SiO 2 composites, 300 K higher than that in SiO 2-cBN/Ni composites, indicating that SiO 2 retarded the transformation of cBN. The relative density of SiO 2-cBN/SiO 2 with 50 vol% cBN sintered at 1873 K was 99% with a hardness of 14.5 GPa.
Original language | English |
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Pages (from-to) | 4961-4966 |
Number of pages | 6 |
Journal | Ceramics International |
Volume | 38 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2012 Aug 1 |
Keywords
- Cubic boron nitride (cBN)
- Ni nanoparticle
- Rotary CVD (RCVD)
- SiO nanolayer
- Spark plasma sintering
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry