TY - JOUR

T1 - Reduced brittleness of multi-walled carbon nanotubes (MWCNTs) containing Al2O3-C refractories with boron carbide

AU - Liao, Ning

AU - Li, Yawei

AU - Jin, Shengli

AU - Sang, Shaobai

AU - Liu, Gengfu

PY - 2017/5/12

Y1 - 2017/5/12

N2 - Boron carbide (B4C) additive was adopted to decrease the brittleness of MWCNTs and silicon (Si) containing Al2O3-C refractories through accommodating the formation of ceramic phases. The corresponding phase compositions and microstructures of Al2O3-C refractories were investigated by means of X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The mechanical properties were investigated by means of three-point bending test and the thermal shock resistance was evaluated through traditional water quenching method combined with wedge splitting test. The results show that B4C could favor the growth of in-situ MWCNTs from pyrolysis of resin binder at 800 ℃. Additionally, B4C additive suppresses the SiC formation at 1400 °C attributes to the decreased SiO (g) pressure. In comparison with the Si alone containing refractories, much more residual MWCNTs and in-situ formed MWCNTs contribute to lower brittleness, leading to better thermal shock resistance of B4C and Si containing Al2O3-C refractories.

AB - Boron carbide (B4C) additive was adopted to decrease the brittleness of MWCNTs and silicon (Si) containing Al2O3-C refractories through accommodating the formation of ceramic phases. The corresponding phase compositions and microstructures of Al2O3-C refractories were investigated by means of X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The mechanical properties were investigated by means of three-point bending test and the thermal shock resistance was evaluated through traditional water quenching method combined with wedge splitting test. The results show that B4C could favor the growth of in-situ MWCNTs from pyrolysis of resin binder at 800 ℃. Additionally, B4C additive suppresses the SiC formation at 1400 °C attributes to the decreased SiO (g) pressure. In comparison with the Si alone containing refractories, much more residual MWCNTs and in-situ formed MWCNTs contribute to lower brittleness, leading to better thermal shock resistance of B4C and Si containing Al2O3-C refractories.

KW - AlO-C refractories

KW - BC

KW - Brittleness

KW - Mechanical properties

KW - MWCNTs growth

UR - http://www.scopus.com/inward/record.url?scp=85019233931&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2017.05.045

DO - 10.1016/j.msea.2017.05.045

M3 - Article

AN - SCOPUS:85019233931

VL - 698.2017

SP - 80

EP - 87

JO - Materials science and engineering: A, Structural materials: properties, microstructure and processing

JF - Materials science and engineering: A, Structural materials: properties, microstructure and processing

SN - 0921-5093

IS - 20 June

ER -