第4期
Preparation of Microporous Corundum and Its Effect on Properties of Al2O3-MgO Castables
作者:GU Huangzhi, HUANG Ao, ZHANG Meijie, LI Zhengkun, MA Lieying, DU Bo, Zou Yang
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期号 : 2014 年, 第4期
页码:22 - 26
内容简介

Based on the pore size design of microporous aggregate by numerical simulation applying porous media model, α-Al2O3 micropowder, industrial Al2O3 fine powder, α-Al2O3 micropowder+CaCO3 fine powder were used as starting materials, respectively, to prepare three microporous corundum aggregates specimens, named as A1, A2 and A3. Two lightweight Al2O3-MgO castables were prepared by selecting A1 or A3 as aggregate with ム.6 μm of average pore size, then performances of castables with microporous corundum aggregates and castables with tabular corundum aggregates were compared. The results show that: (1) the microporous corundum aggregates with bulk density of 3.1-3.5柠·cm-3, apparent porosity of 5%, closed porosity of 8%-13%, and smaller thermal conductivity at 800 ℃ than tabular corundum, can be prepared by sintering at above 1 800 ℃; (2) compared to normal Al2O3-MgO castables, the two lightweight Al2O3-MgO castables have lower bulk density and higher apparent porosity; lower change rate in dimensions and higher strength firing at 1 500 ℃; and lower thermal conductivity at 600 and 800 ℃; (3) compared to normal Al2O3-MgO castables, Al2O3-MgO castable with A1 has higher penetration index, and that with A3 has higher corrosion

所需耐材币:5
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