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Fabrication and sintering of nano $TiN_x$ and its composites  

Kim, Dong-Sik (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Kim, Sung-Jin (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Rahno, Khamidova (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Park, Sung-Bum (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Park, Seung-Sik (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Lee, Hye-Jeong (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Lee, Sang-Woo (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Cho, Kyeong-Sik (Department of Information and Nano Materials, Kumoh National Institute of Technology)
Woo, Heung-Sik (Department of Safety Engineering, DongEuk University)
Ahn, Joong-Ho (Advenced Materials Engineering, Andong National University)
Abstract
We fabricated the nano $TiN_x$ by making of reaction between titanium powder and $Si_3N_4$ during planetary milling. The $TiN_x$ powder was sintered by spark plasma sintering machine after mixing with 50 wt% of titanium powder, and the sintered body was heat-treated at $850^{\circ}C$ in order to investigate its hardness property at the elevated temperature. We analyzed crystal structure by XRD. We observed the peaks of $TiN_{0.26}$ and TiN after 10 hours milling, and we observed TiN peak mainly after 20 hours milling. The reacted particle size distribution was investigated by FE-SEM. Increase of milling time, the size of reacted particles was decreased and the $10{\sim}20nm$ size of $TiN_x$ on the surface of titanium and $TiN_x$ was observed after 20 hours milling. The micro-Vickers hardness of mixed sintered body was about $1050kgf/mm^2$.
Keywords
$Nano-TiN_x$; Planetary milling; Composites; Hardness; Reaction; Size reduction;
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