TY - JOUR
T1 - Microstructural, thermal and mechanical characterization of TiB 2 –SiC composites doped with short carbon fibers
AU - Nekahi, Sahar
AU - Sadegh Moghanlou, Farhad
AU - Vajdi, Mohammad
AU - Ahmadi, Zohre
AU - Motallebzadeh, Amir
AU - Shahedi Asl, Mehdi
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/8
Y1 - 2019/8
N2 - Spark plasma sintering method, at the temperature of 1800 °C under the pressure of 40 MPa for 7 min, was employed for fabrication of TiB 2 –SiC-based composites. The influences of short carbon fiber (C f ) addition (2 wt%) on microstructural, mechanical and thermal properties of TiB 2 –SiC ceramics were studied. Carbon fiber addition increased the relative density of sintered composite which observed to have direct effect on mechanical and thermal properties. The mechanical properties of composites were measured by nanoindentation method. Hardness and elastic modulus of TiB 2 /SiC interfaces in carbon fiber doped composite were measured 27.1 GPa and 445 GPa, respectively, while these values were obtained 24.2 GPa and 422 GPa for carbon-free sample. The thermal diffusivity of samples was measured by laser flash technique (LFT). It was found that TiB 2 –SiC–C f composite has a higher thermal conductivity (55 w/m.K) compared to TiB 2 –SiC ceramic with a value of 54.8 w/m.K.
AB - Spark plasma sintering method, at the temperature of 1800 °C under the pressure of 40 MPa for 7 min, was employed for fabrication of TiB 2 –SiC-based composites. The influences of short carbon fiber (C f ) addition (2 wt%) on microstructural, mechanical and thermal properties of TiB 2 –SiC ceramics were studied. Carbon fiber addition increased the relative density of sintered composite which observed to have direct effect on mechanical and thermal properties. The mechanical properties of composites were measured by nanoindentation method. Hardness and elastic modulus of TiB 2 /SiC interfaces in carbon fiber doped composite were measured 27.1 GPa and 445 GPa, respectively, while these values were obtained 24.2 GPa and 422 GPa for carbon-free sample. The thermal diffusivity of samples was measured by laser flash technique (LFT). It was found that TiB 2 –SiC–C f composite has a higher thermal conductivity (55 w/m.K) compared to TiB 2 –SiC ceramic with a value of 54.8 w/m.K.
KW - Carbon fiber
KW - Microstructure
KW - Nanoindentation
KW - Spark plasma sintering
KW - Thermal conductivity
KW - TiB –SiC
UR - http://www.scopus.com/inward/record.url?scp=85064242105&partnerID=8YFLogxK
U2 - 10.1016/j.ijrmhm.2019.04.005
DO - 10.1016/j.ijrmhm.2019.04.005
M3 - Article
AN - SCOPUS:85064242105
SN - 0263-4368
VL - 82
SP - 129
EP - 135
JO - International Journal of Refractory Metals and Hard Materials
JF - International Journal of Refractory Metals and Hard Materials
ER -