TY - JOUR
T1 - Interfacial phenomena and formation of nano-particles in porous ZrB2–40 vol% B4C UHTC
AU - Nayebi, Behzad
AU - Asl, Mehdi Shahedi
AU - Kakroudi, Mahdi Ghassemi
AU - Farahbakhsh, Iman
AU - Shokouhimehr, M.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd and Techna Group S.r.l.
PY - 2016/11/15
Y1 - 2016/11/15
N2 - The micro/nanostructural development, sintering process and its controlling mechanisms as well as the interfaces between ZrB2 and B4C particles were investigated using high resolution SEM, XRD and TEM analyses in a hot pressed ZrB2–40 vol% B4C ceramic composite. Two types of porosities (open and closed) were observed in the microstructure of fabricated porous composite, which were caused by different factors. The results showed that the sintering process was encouraged by the formation of liquid phases at the interfaces, elimination of oxide impurities from the surfaces of ZrB2 particles (due to the chemical reactions with B4C particles and their free carbon), plastic deformation of ZrB2 grains and the diffusion of carbon and/or boron atoms from B4C toward ZrB2 particles. A mixture of nano-particles and nano-porosities at the submicron thickness amorphous ZrB2/B4C interfaces is detected and discussed in detail.
AB - The micro/nanostructural development, sintering process and its controlling mechanisms as well as the interfaces between ZrB2 and B4C particles were investigated using high resolution SEM, XRD and TEM analyses in a hot pressed ZrB2–40 vol% B4C ceramic composite. Two types of porosities (open and closed) were observed in the microstructure of fabricated porous composite, which were caused by different factors. The results showed that the sintering process was encouraged by the formation of liquid phases at the interfaces, elimination of oxide impurities from the surfaces of ZrB2 particles (due to the chemical reactions with B4C particles and their free carbon), plastic deformation of ZrB2 grains and the diffusion of carbon and/or boron atoms from B4C toward ZrB2 particles. A mixture of nano-particles and nano-porosities at the submicron thickness amorphous ZrB2/B4C interfaces is detected and discussed in detail.
KW - Interface
KW - Nano-particles/pores
KW - Sintering
KW - Ultrahigh temperature ceramic
UR - http://www.scopus.com/inward/record.url?scp=84997287979&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2016.07.208
DO - 10.1016/j.ceramint.2016.07.208
M3 - Article
AN - SCOPUS:84997287979
SN - 0272-8842
VL - 42
SP - 17009
EP - 17015
JO - Ceramics International
JF - Ceramics International
IS - 15
ER -