Combined effects of boron carbide, silicon, and MWCNTs in alumina-carbon refractories on their microstructural evolution

被引：35

作者：

Liao, Ning ^{[1
]}

Li, Yawei ^{[1
]}

Jin, Shengli ^{[2
]}

Xu, Yibiao ^{[1
]}

Sang, Shaobai ^{[1
]}

Deng, Zhaojun ^{[3
]}

机构：

[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan, Peoples R China

[2] Univ Leoben, Leoben, Austria

[3] Wuhan Iron & Steel Grp, Design & Res Inst, Wuhan, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2017年 / 100卷 / 01期

关键词：

Al2O3-C refractories; MWCNTs transformation; Si; B4C catalysis; B doping; MECHANICAL-PROPERTIES; AL2O3-C REFRACTORIES; OXIDATION RESISTANCE; DOPED CARBON; NANOTUBES; MICROSILICA; WHISKERS; SURFACE; GROWTH;

D O I：

10.1111/jace.14543

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 degrees 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 N-2 are obtained under evaluated temperatures.

引用

页码：443 / 450

页数：8

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