Investigation of Mechanical Property and Thermal Shock Behavior of Machinable B4C/BN Ceramics Composites |
| Journal |
Materials Science Forum (Volume 569) |
| Volume |
Eco-Materials Processing and Design IX |
| Edited by |
Byungsei Jun, Hyungsun Kim, Chanwon Lee, Soo Wohn Lee |
| Pages |
53-56 |
| DOI |
10.4028/www.scientific.net/MSF.569.53 |
| Online since |
January, 2008 |
| Authors |
Tao Jiang,
Hai Yun Jin,
Zhi Hao Jin,
Jian Feng Yang,
Guan Jun Qiao
|
| Keywords |
Boron Carbide, Boron Nitride, Machinability, Mechanical Property, Thermal Shock Resistance |
| Abstract |
The machinable B4C/BN ceramics composites were fabricated by hot-pressing sintering
process at 1850oC for 1h under the pressure of 30MPa. The mechanical property, thermal shock
behavior and machinability of the B4C/BN ceramics composites were investigated in this article. The
experimental results showed that the fracture strength and fracture toughness of the B4C/BN
nanocomposites were significantly improved in comparison with the B4C/BN microcomposites. The
Vickers hardness of the B4C/BN nanocomposites and B4C/BN microcomposites decreased gradually
with the increasing content of h-BN, while the machinability of the B4C/BN nanocomposites and
B4C/BN microcomposites were significantly improved. The B4C/BN ceramics composites with the
h-BN content more than 20wt% exhibited excellent machinability. The thermal shock resistances of
the B4C/BN ceramics composites were better than that of the B4C monolith, and the thermal shock
resistance of the B4C/BN nanocomposites was much better than that of the B4C/BN microcomposites.
The thermal shock temperature difference (-Tc) of B4C monolith was about 300oC, while the -Tc of
the B4C/BN microcomposites was about 500oC, the -Tc of the B4C/BN nanocomposites was about
600oC. |
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