TY - JOUR
T1 - Densification of SiO 2-cBN composites by using Ni nanoparticle and SiO 2 nanolayer coated cBN powder
AU - Zhang, Jianfeng
AU - Tu, Rong
AU - Goto, Takashi
N1 - Funding Information:
This research was financially supported by the Rare Metal Substitute Materials Development Project, New Energy and Industry Technology Development Organization (NEDO) , by the Global COE Program (International Center of Education and Research) “Materials Integration, Tohoku University” , and by the International Collaboration Center, ICC-IMR, Tohoku University .
PY - 2012/8
Y1 - 2012/8
N2 - 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.
AB - 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.
KW - Cubic boron nitride (cBN)
KW - Ni nanoparticle
KW - Rotary CVD (RCVD)
KW - SiO nanolayer
KW - Spark plasma sintering
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U2 - 10.1016/j.ceramint.2012.02.090
DO - 10.1016/j.ceramint.2012.02.090
M3 - Article
AN - SCOPUS:84862784584
VL - 38
SP - 4961
EP - 4966
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 6
ER -