TY - JOUR
T1 - Reactive hot pressing of ZrB2-based composites with changes in ZrO2/SiC ratio and sintering conditions. Part II
T2 - Mechanical behavior
AU - Pourmohammadie Vafa, Nasser
AU - Nayebi, Behzad
AU - Shahedi Asl, Mehdi
AU - Jaberi Zamharir, Mehran
AU - Ghassemi Kakroudi, Mahdi
N1 - Publisher Copyright:
© 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - ZrB2-based ultra-high temperature composites reinforced with SiC and nano-ZrO2 particles were hot pressed. Taguchi method was used in order to investigate the effect of ZrO2/SiC volume ratio as well as the hot pressing parameters on the mechanical behavior of the composites. The significance of each parameter over the relative density and Vickers hardness of the hot pressed composites and also, optimum conditions to get a composite with maximum relative density and hardness were estimated according to the statistical analyses. The highest Vickers hardness of ∼15.4 GPa was achieved for the composite with ZrO2/SiC ratio of 0.2 hot pressed at 1850 °C for 90 min under 12 MPa. Mentioned parameters were found to be the optimum condition for the Vickers hardness proposed by Taguchi method. A fracture toughness of 6.7 MPa m2 was also measured for the mentioned composite which was nearly fully densified (98% relative density) at optimum conditions. Crack deflection, crack branching, microcracking and crack arresting were found to be the dominant toughening mechanisms contributing in the fracture toughness enhancement.
AB - ZrB2-based ultra-high temperature composites reinforced with SiC and nano-ZrO2 particles were hot pressed. Taguchi method was used in order to investigate the effect of ZrO2/SiC volume ratio as well as the hot pressing parameters on the mechanical behavior of the composites. The significance of each parameter over the relative density and Vickers hardness of the hot pressed composites and also, optimum conditions to get a composite with maximum relative density and hardness were estimated according to the statistical analyses. The highest Vickers hardness of ∼15.4 GPa was achieved for the composite with ZrO2/SiC ratio of 0.2 hot pressed at 1850 °C for 90 min under 12 MPa. Mentioned parameters were found to be the optimum condition for the Vickers hardness proposed by Taguchi method. A fracture toughness of 6.7 MPa m2 was also measured for the mentioned composite which was nearly fully densified (98% relative density) at optimum conditions. Crack deflection, crack branching, microcracking and crack arresting were found to be the dominant toughening mechanisms contributing in the fracture toughness enhancement.
KW - A: Hot pressing
KW - C: Mechanical properties
KW - Nano-ZrO
KW - Taguchi method
KW - ZrB-SiC composites
UR - http://www.scopus.com/inward/record.url?scp=84955180452&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2015.10.166
DO - 10.1016/j.ceramint.2015.10.166
M3 - Article
AN - SCOPUS:84955180452
SN - 0272-8842
VL - 42
SP - 2724
EP - 2733
JO - Ceramics International
JF - Ceramics International
IS - 2
ER -