TY - JOUR
T1 - Densification and mechanical properties of cBN-TiN-TiB2 composites prepared by spark plasma sintering of SiO2-coated cBN powder
AU - Kitiwan, Mettaya
AU - Ito, Akihiko
AU - Zhang, Jianfeng
AU - Goto, Takashi
N1 - Funding Information:
This research was supported in part by the Japan Society for the Promotion of Science , Grant-in-Aid for Exploratory Research, 24655186 , and the Ministry of Education, Science, Sports and Culture of Japan , Grant-in-Aid for Scientific Research (B), 25289223 .
PY - 2014/12
Y1 - 2014/12
N2 - cBN-TiN-TiB2 composites were fabricated by spark plasma sintering at 1773-1973K using cubic boron nitride (cBN) and SiO2-coated cBN (cBN(SiO2)) powders. The effect of SiO2 coating, cBN content and sintering temperature on the phase composition, densification and mechanical properties of the composites was investigated. SiO2 coating on cBN powder retarded the phase transformation of cBN in the composites up to 1873K and facilitated viscous sintering that promoted the densification of the composites. Sintering at 1873K, without the SiO2 coating, caused the relative density and Vickers hardness of the composite to linearly decrease from 96.2% to 79.8% and from 25.3 to 4.4GPa, respectively, whereas the cBN(SiO2)-TiN-TiB2 composites maintained high relative density (91.0-96.2%) and Vickers hardness (17.9-21.0GPa) up to 50vol% cBN. The cBN(SiO2)-TiN-TiB2 composites had high thermal conductivity (60Wm-1K-1 at room temperature) comparable to the TiN-TiB2 binary composite.
AB - cBN-TiN-TiB2 composites were fabricated by spark plasma sintering at 1773-1973K using cubic boron nitride (cBN) and SiO2-coated cBN (cBN(SiO2)) powders. The effect of SiO2 coating, cBN content and sintering temperature on the phase composition, densification and mechanical properties of the composites was investigated. SiO2 coating on cBN powder retarded the phase transformation of cBN in the composites up to 1873K and facilitated viscous sintering that promoted the densification of the composites. Sintering at 1873K, without the SiO2 coating, caused the relative density and Vickers hardness of the composite to linearly decrease from 96.2% to 79.8% and from 25.3 to 4.4GPa, respectively, whereas the cBN(SiO2)-TiN-TiB2 composites maintained high relative density (91.0-96.2%) and Vickers hardness (17.9-21.0GPa) up to 50vol% cBN. The cBN(SiO2)-TiN-TiB2 composites had high thermal conductivity (60Wm-1K-1 at room temperature) comparable to the TiN-TiB2 binary composite.
KW - Cubic boron nitride
KW - Spark plasma sintering
KW - Titanium diboride
KW - Titanium nitride
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U2 - 10.1016/j.jeurceramsoc.2014.05.018
DO - 10.1016/j.jeurceramsoc.2014.05.018
M3 - Article
AN - SCOPUS:84905595251
VL - 34
SP - 3619
EP - 3626
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 15
ER -