The silicon carbide ceramic membrane support bonded by mullite (3Al2O3?2SiO2) which formed by in situ reaction has good thermal shock resistance, however, few studies have been made for in situ reaction by adding ρ-Al2O3. In this paper, the porous SiC membrane support using black silicon carbide as aggregate, and by adding different content of ρ-Al2O3, was prepared by the reaction of Al2O3 and SiO2 which produced by the oxidation of the SiC particles surface under pressureless sintering at 1430℃ for 3 h in a muffle furnace. The effects of ρ-Al2O3 addition on the phase composition and properties of silicon carbide support were studied. The results showed that the mullite content in the bonding phase increased with the addition amount of ρ-Al2O3 powder increased, and the cristobalite content decreased relatively but could not be completely eliminated. The interconnected pores of support were produced mainly by SiC coarse particles (150?180 μm) packing. The surface of SiC was oxidized to amorphous SiO2 that further crystallized to form cristobalite during sintering at higher temperatures in air. Meanwhile, pre-added ρ-Al2O3 eventually converted into highly activated α-Al2O3 after a series of crystal transformation with increasing temperature. The mullite was formed by in situ reaction between the obtained cristobalite and α-Al2O3 at higher temperature. SiC particles were strongly bonded by mullite and oxidation-derived SiO2 to obtain porous SiC membrane support. The open porosity of the samples decreased from 37.4% to 34.8% with the amount of ρ-Al2O3 powder increasing from 3wt% to 15wt%, and the air permeability of the samples dropped from 1127.8 m3?cm/(m2?h?kPa) to 210.4 m3?cm/(m2?h?kPa) with median pore diameter reduced, accordingly. However, the bending strength increased at the first stage and then decreased with the increase of ρ-Al2O3 powder addition. The support with the flexural strength of 25.1 MPa and air permeability of 372.7 m3?cm/(m2?h?kPa) were developed by adding 9wt% ρ-Al2O3. The porous SiC membrane support could meet the needs of high temperature gas filtration under normal pressure.
Zhiyong LUO Kaiqi LIU Wei HAN Wenqing AO Yunfa CHEN
. Effect of ρ-Al2O3 addition on the properties of in situ reaction-bonded porous SiC membrane support[J]. The Chinese Journal of Process Engineering, 2019
, 19(2)
: 407
-412
.
DOI: 10.12034/j.issn.1009-606X.218225
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