| Micro-Porosity and Properties of Light-Weight Insulation
Refractories Based on Calcined Flint Clay |
Jianbo Liu,a Yuanbing Li,a,b,* Shujing Li,a,b Nana Xu,a Ruofei Xianga and Qingheng Wanga
Page : 7-12
DOI : 10.1080/0371750X.2019.1566023 |
| Abstract |
| In this study, light-weight insulation materials were prepared with calcined
flint clay as the main material and sawdust was infused by sols as a pore
forming agent. Micro-porosity and properties of the prepared insulation materials
were investigated and were found to have better comprehensive properties.
Apparent porosity, bulk density and cold crushing strength of the compositions
containing 40 wt% calcined flint clay, fired at 1400oC for 3 h, were found to be
71%, 0.85 g.cm–3 and 2.65 MPa, respectively. Thermal conductivity of the material
was 0.133 W.m–1.K–1 at 300oC. When sawdust was soaked by 0 wt% sol,
microstructure of the materials showed irregular pores. When sawdust was infused
with 7 wt% alumina sol, the micropores were wrapped with larger pore. Meanwhile,
the original pore was refined, and cold crushing strength and thermal conductivity
were also optimized. When the sawdust was soaked in alumina sol, the cold
crushing strength increased to 3.3 MPa and the thermal conductivity decreased
to 0.116 W.m–1·K–1 at 300oC. Grey correlation method indicated that the pore size
of <2 m, 2-6 m and 18-26 m had more significant influence on cold crushing
strength and thermal conductivity.
[Keywords: Light-weight insulation refractory, Calcined flint clay, Micro-porosity,
Grey correlation method] |
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