Combined Effects of Boron Carbide, Silicon, and MWCNTs in Alumina-Carbon Refractories on Their Microstructural Evolution
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in: Journal of the American Ceramic Society, Jahrgang 100.2017, Nr. 1, 2017, S. 443-450.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Combined Effects of Boron Carbide, Silicon, and MWCNTs in Alumina-Carbon Refractories on Their Microstructural Evolution
AU - Liao, Ning
AU - Li, Yawei
AU - Jin, Shengli
AU - Xu, Yibiao
AU - Sang, Shaobai
AU - Deng, Zhaojun
PY - 2017
Y1 - 2017
N2 - The phase and microstructure evolutions of multiwalled carbon nanotubes (MWCNTs) in B4C- and Si-containing Al2O3–C specimens under elevated temperatures were investigated by means of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results show that the incorporation of B4C decreases the partial pressure of SiO(g) in Al2O3–C specimens due to the oxidation of B4C prior to Si at lower temperature, which prevents the transformation of MWCNTs at 1000°C and suspends the transformation under higher temperature. B2O3 vapor resulting from oxidation of B4C powder reacts with C sources to generate nanoscaled B4C droplets, which facilitate the catalytic formation of new MWCNTs and nano onion-like carbon. In addition, B-doped MWCNTs and BN tubes with the coexistence of B2O3, MWCNTs, and N2 are obtained under evaluated temperatures.
AB - The phase and microstructure evolutions of multiwalled carbon nanotubes (MWCNTs) in B4C- and Si-containing Al2O3–C specimens under elevated temperatures were investigated by means of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results show that the incorporation of B4C decreases the partial pressure of SiO(g) in Al2O3–C specimens due to the oxidation of B4C prior to Si at lower temperature, which prevents the transformation of MWCNTs at 1000°C and suspends the transformation under higher temperature. B2O3 vapor resulting from oxidation of B4C powder reacts with C sources to generate nanoscaled B4C droplets, which facilitate the catalytic formation of new MWCNTs and nano onion-like carbon. In addition, B-doped MWCNTs and BN tubes with the coexistence of B2O3, MWCNTs, and N2 are obtained under evaluated temperatures.
U2 - 10.1111/jace.14543
DO - 10.1111/jace.14543
M3 - Article
VL - 100.2017
SP - 443
EP - 450
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 1
ER -
