Journal
CERAMICS INTERNATIONAL
Volume 38, Issue 6, Pages 4961-4966Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.02.090
Keywords
Ni nanoparticle; SiO2 nanolayer; Cubic boron nitride (cBN); Rotary CVD (RCVD); Spark plasma sintering
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Funding
- Rare Metal Substitute Materials Development Project, New Energy and Industry Technology Development Organization (NEDO)
- Global COE Program (International Center of Education and Research) Materials Integration, Tohoku University
- International Collaboration Center, ICC-IMR, Tohoku University
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Cubic boron nitride (cBN) powder was coated with Ni nanoparticle and SiO2 nanolayer (abbreviated as cBN/Ni and cBN/SiO2, respectively) by rotary chemical vapor deposition (RCVD), and compacted with SiO2 powder by spark plasma sintering at 1473-1973 K for 0.6 ks. The effects of Ni and SiO2 coatings on the densification, phase transformation of cBN and hardness of SiO2-cBN composites were compared. The phase transformation of cBN to hBN was identified at 1973 K in SiO2-cBN/SiO2 composites, 300 K higher than that in SiO2-cBN/Ni composites, indicating that SiO2 retarded the transformation of cBN. The relative density of SiO2-cBN/SiO2 with 50 vol% cBN sintered at 1873 K was 99% with a hardness of 14.5 GPa. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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