TY - JOUR
T1 - Synergetic effects of SiC and Csf in ZrB2-based ceramic composites. Part I
T2 - Densification behavior
AU - Shahedi Asl, Mehdi
AU - Golmohammadi, Fatemeh
AU - Ghassemi Kakroudi, Mahdi
AU - Shokouhimehr, Mohammadreza
N1 - Publisher Copyright:
© 2015 Elsevier Ltd and Techna Group S.r.l.
PY - 2016/2/15
Y1 - 2016/2/15
N2 - The effects of processing variables on densification behavior of hot pressed ZrB2-based composites, reinforced with SiC particles and short carbon fibers (Csf), were studied. A design of experiment approach, Taguchi methodology, was used to investigate the characteristics of ZrB2-SiC-Csf composites concentrated upon the hot pressing parameters (sintering temperature, dwell time and applied pressure) as well as the composition (vol% SiC/vol% Csf). The analysis of variance recognized the sintering temperature and SiC/Csf ratio as the most effective variables on the relative density of hot pressed composites. The microstructural investigations showed that Csf can act as a sintering aid and eliminate the oxide impurities (e.g. B2O3, ZrO2 and SiO2) from the surfaces of raw materials. A fully dense composite was achieved by adding 10 vol% Csf and 20 vol% SiC to the ZrB2 matrix via hot pressing at 1850 °C for 30 min under a pressure of 16 MPa. Moreover, the in-situ formation of interfacial ZrC, which also improves the sinterability of ZrB2-based composites, was studied by energy-dispersive X-ray spectroscopy analysis and verified thermodynamically.
AB - The effects of processing variables on densification behavior of hot pressed ZrB2-based composites, reinforced with SiC particles and short carbon fibers (Csf), were studied. A design of experiment approach, Taguchi methodology, was used to investigate the characteristics of ZrB2-SiC-Csf composites concentrated upon the hot pressing parameters (sintering temperature, dwell time and applied pressure) as well as the composition (vol% SiC/vol% Csf). The analysis of variance recognized the sintering temperature and SiC/Csf ratio as the most effective variables on the relative density of hot pressed composites. The microstructural investigations showed that Csf can act as a sintering aid and eliminate the oxide impurities (e.g. B2O3, ZrO2 and SiO2) from the surfaces of raw materials. A fully dense composite was achieved by adding 10 vol% Csf and 20 vol% SiC to the ZrB2 matrix via hot pressing at 1850 °C for 30 min under a pressure of 16 MPa. Moreover, the in-situ formation of interfacial ZrC, which also improves the sinterability of ZrB2-based composites, was studied by energy-dispersive X-ray spectroscopy analysis and verified thermodynamically.
KW - A. Hot pressing
KW - Carbon fiber
KW - D. SiC
KW - Densification
KW - Taguchi method
KW - ZrB
UR - http://www.scopus.com/inward/record.url?scp=84951991099&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2015.11.139
DO - 10.1016/j.ceramint.2015.11.139
M3 - Article
AN - SCOPUS:84951991099
SN - 0272-8842
VL - 42
SP - 4498
EP - 4506
JO - Ceramics International
JF - Ceramics International
IS - 3
ER -