TY - JOUR
T1 - Microstructural, mechanical and friction properties of nano-graphite and h-BN added TiC-based composites
AU - Nguyen, Van Huy
AU - Delbari, Seyed Ali
AU - Sabahi Namini, Abbas
AU - Babapoor, Aziz
AU - Le, Quyet Van
AU - Jang, Ho Won
AU - Shokouhimehr, Mohammadreza
AU - Shahedi Asl, Mehdi
AU - Mohammadi, Mohsen
N1 - Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/12/15
Y1 - 2020/12/15
N2 - In this study, a graphite and h-BN added TiC-based ceramic was produced by spark plasma sintering at 1900 °C. The sinterability of the graphite-doped sample could be improved, because undesirable TiO2 oxide layers were generally eliminated at the temperature of ~1300 °C. However, the co-addition of graphite and h-BN additives simultaneously had a destructive impact on the relative density of TiC because of the entrapped produced gases in the sintered composite at the high sintering temperature. According to the results, the introduced h-BN was partially reacted with the TiC/TiO2 compounds, forming in-situ TiB2 and TiB phases. The sample doped with graphite presented the most significant strength (over 630 MPa) where the relative density, grain size, and dispersion of the secondary phases were found as the influential factors. Finally, the highest coefficient of friction (~0.33) was achieved for the TiC-graphite specimen due to the distribution of the graphite with weak bonding within the TiC matrix.
AB - In this study, a graphite and h-BN added TiC-based ceramic was produced by spark plasma sintering at 1900 °C. The sinterability of the graphite-doped sample could be improved, because undesirable TiO2 oxide layers were generally eliminated at the temperature of ~1300 °C. However, the co-addition of graphite and h-BN additives simultaneously had a destructive impact on the relative density of TiC because of the entrapped produced gases in the sintered composite at the high sintering temperature. According to the results, the introduced h-BN was partially reacted with the TiC/TiO2 compounds, forming in-situ TiB2 and TiB phases. The sample doped with graphite presented the most significant strength (over 630 MPa) where the relative density, grain size, and dispersion of the secondary phases were found as the influential factors. Finally, the highest coefficient of friction (~0.33) was achieved for the TiC-graphite specimen due to the distribution of the graphite with weak bonding within the TiC matrix.
KW - Densification
KW - Graphite nano-flakes
KW - h-BN
KW - SPS
KW - TiC
UR - http://www.scopus.com/inward/record.url?scp=85089754385&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2020.08.068
DO - 10.1016/j.ceramint.2020.08.068
M3 - Article
AN - SCOPUS:85089754385
SN - 0272-8842
VL - 46
SP - 28969
EP - 28979
JO - Ceramics International
JF - Ceramics International
IS - 18
ER -