12 / 33
Page 80
conferenceseries
.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Ceramics 2018
May 14-15, 2018
May 14-15, 2018 | Rome, Italy
4
th
International Conference and Expo on
Ceramics and Composite Materials
Synthesis of Al
2
O
3
-SiC porous ceramics from coal ash
Beiyue Ma
1
, Yue Yin
2
, Yaran Zhang
3
, Chang Su
4
and
Shiming Li
5
1,3,4,5
Northeastern University, China
2
Technische Universität Darmstadt, Germany
C
oal ash is an industrial waster during the combustion of coal for energy production, which is identified as an environmental
pollutant. It is necessary to find a new route which can effectively and comprehensively utilize coal ash. We reported
using coal ash and activated carbon as raw materials to synthesize Al
2
O
3
-SiC porous ceramics by carbon reduction reaction
method. Effects of silicon carbide content on phase compositions, microstructures, mechanical properties, apparent porosity,
distribution of pore size, thermal diffusivity, and compressive strength of final products were investigated. Experimental results
showed that Al
2
O
3
-SiC porous ceramics can be synthesized with the mass ratio of coal ash to activated carbon is 100:58, an
addition amount of silicon carbide10wt%, and 5wt% phenolic resin as a binder at 1600 °C for 5 h. The as-synthesized Al
2
O
3
-SiC
porous ceramics have the apparent porosity of 48.35%, the high temperature and room temperature compressive strength of
21.65MPa and17.57MPa, water absorption of 33.21%, the thermal shock resistance more than 8 times (1400°C, 6 times in air
and 2 times in water), diameter shrinkage of 15.48%, bulk density of 1.05g/cm
3
, thermal diffusivity of 0.0194cm2/s, and median
size is about 4.24μm. The formation process of Al
2
O
3
-SiC porous ceramics was also discussed.
maby@smm.neu.edu.cnRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C1-015