| Microstructures and Properties of Carbon Fibers and in-situ
Whiskers Reinforced Mullite-Based Castable Composites |
Si Ouyang,1 Yuanbing Li,1, 2,* Shujing Li,1, 2 Degang Ouyang,3 Ruofei Xiang1, 2 and Nana Xu1
Pages : 182-187
DOI : 10.1080/0371750X.2020.1801515 |
| Abstract |
| ABSTRACT
With spalling and corrosion during thermal cycles, the castable composites
used in injecting lance are easily damaged. In order to solve this problem,
we used carbon fibers as additives in the matrix, and prepared mullitebased
castables with the addition of anti-oxidant silicon. It was found that
the addition of carbon fibers could significantly improve the mechanical
properties; the maximum mechanical strength was obtained when 0.1 wt%
carbon fibers was added, and the maximum thermal shock resistance was
obtained when 0.2 wt% carbon fibers was added. The carbon fibers were
oxidized mostly after firing at 1100oC, while after firing at 1450oC, due to the
dense oxide layers generated on the surface of the castables, most of the
carbon fibers in the castables remained in good combination with the matrix.
Some SiC whiskers with SiO2 coating were formed in the matrix after heat
treatment at 1100oC in air. The model of the whiskers growth mechanism
followed the vapour-solid mechanism.
[Keywords: Carbon fibers, Whiskers formation, Mechanical properties,
Microstructures] |
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