ρ-Al_2O_3添加量对原位反应结合碳化硅膜支撑体性能的影响
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摘要
以黑色碳化硅为骨料,添加不同含量的ρ-Al_2O_3,在1430℃、无压条件下,用碳化硅表面氧化产生的SiO_2与Al_2O_3反应制备多孔碳化硅膜支撑体,研究了ρ-Al_2O_3添加量对碳化硅支撑体粘结相组成及性能的影响。结果表明,ρ-Al_2O_3添加量由3wt%增加到15wt%时,试样烧结后粘结相中莫来石相增多,石英相减少但不能完全消除,支撑体的显气孔率降低,孔径减小,透气度由1127.8 m3·cm/(m~2·h·kPa)下降到210.4 m~3·cm/(m~2·h·kPa);支撑体抗弯强度先增大后降低,ρ-Al_2O_3添加量为9wt%时,支撑体抗弯强度为25.1 MPa,透气度为372.7 m3·cm/(m~2·h·kPa),支撑体的综合性能满足高温含尘气体过滤的要求。
The silicon carbide ceramic membrane support bonded by mullite(3 Al_2O_3·2 SiO_2) which formed by in situ reaction has good thermal shock resistance, however, few studies have been made for in situ reaction by adding ρ-Al_2O_3. In this paper, the porous SiC membrane support using black silicon carbide as aggregate, and by adding different content of ρ-Al_2O_3, was prepared by the reaction of Al_2O_3 and SiO_2 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-Al_2O_3 addition on the phasecomposition 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-Al_2O_3 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 SiO 2 that further crystallized to form cristobalite during sintering at higher temperatures in air. Meanwhile, pre-added ρ-Al_2O_3 eventually converted into highly activated α-Al_2O_3 after a series of crystal transformation with increasing temperature. The mullite was formed by in situ reaction between the obtained cristobalite and α-Al_2O_3 at higher temperature. SiC particles were strongly bonded by mullite and oxidation-derived SiO_2 to obtain porous SiC membrane support. The open porosity of the samples decreased from 37.4% to 34.8% with the amount of ρ-Al_2O_3 powder increasing from 3 wt% to 15 wt%, 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-Al_2O_3 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 9 wt% ρ-Al_2O_3. The porous SiC membrane support could meet the needs of high temperature gas filtration under normal pressure.
The silicon carbide ceramic membrane support bonded by mullite(3 Al_2O_3·2 SiO_2) which formed by in situ reaction has good thermal shock resistance, however, few studies have been made for in situ reaction by adding ρ-Al_2O_3. In this paper, the porous SiC membrane support using black silicon carbide as aggregate, and by adding different content of ρ-Al_2O_3, was prepared by the reaction of Al_2O_3 and SiO_2 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-Al_2O_3 addition on the phasecomposition 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-Al_2O_3 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 SiO 2 that further crystallized to form cristobalite during sintering at higher temperatures in air. Meanwhile, pre-added ρ-Al_2O_3 eventually converted into highly activated α-Al_2O_3 after a series of crystal transformation with increasing temperature. The mullite was formed by in situ reaction between the obtained cristobalite and α-Al_2O_3 at higher temperature. SiC particles were strongly bonded by mullite and oxidation-derived SiO_2 to obtain porous SiC membrane support. The open porosity of the samples decreased from 37.4% to 34.8% with the amount of ρ-Al_2O_3 powder increasing from 3 wt% to 15 wt%, 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-Al_2O_3 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 9 wt% ρ-Al_2O_3. The porous SiC membrane support could meet the needs of high temperature gas filtration under normal pressure.
引文
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[15]罗明华,曾可令.多孔陶瓷的表征与性能测试技术[J].佛山陶瓷,2002,2(85):3-6.Luo M H,Zeng K L.Characterization and testing technology of porous ceramics[J].Foshan Ceram,2002,2(85):3-6.
[16]周谟仁.流体力学泵与风机[M].北京:中国建筑工业出版社,1979,51:88-124.Zhou M R.Hydromechanic pump and fan[M].Beijing:China Architecture&Building Press,1979,51:88-124.
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[3]Agnieszka G,Ludoslaw S,Pawel L.Microstructure and mechanical properties of silicon carbide pressureless sintered with oxide additives[J].Journal of the European Ceramic Society,2007,27(2/3):781-789.
[4]Ding S Q,Zhu S,Zeng Y P,et al.Fabrication of mullite-bonded porous silicon carbide ceramics by in situ reaction bonding[J].Journal of the European Ceramic Society,2007,27(4):2095-2102.
[5]Zhu S,Ding S,Xi H,et al.Preparation and characterization of SiC/cordierite composite porous ceramics[J].Ceramics International,2007,33(1):115-118.
[6]Chun Y S,Kim Y W.Processing and mechanical properties of porous silica-bonded silicon carbide ceramics[J].Metals and Materials International,2005,11(5):351-355.
[7]Chae S H,Kim Y W,Song I H,et al.Low temperature processing and properties of porous frit-bonded SiC ceramics[J].Journal of the Korean Ceramic Society,2009,46(5):488-492.
[8]Ding S Q,Zhu S,Zeng Y P,et al.Effect of Y2O3 addition on the properties of reaction-bonded porous SiC ceramics[J].Ceramics International,2006,32(4):461-466.
[9]Eom J H,Kim Y W,Raju S.Processing and properties of macroporous silicon carbide ceramics:a review[J].Journal of Asian Ceramic Societies,2013,1(4):220-242.
[10]Dey A,Kayal N,Chakrabarti O.Preparation of mullite bonded porous SiC ceramics by an infiltration method[J].Journal of Materials Science,2011,46(16):5432-5438.
[11]Kumar B V M,Eom J H,Kim Y W,et al.Effect of aluminum hydroxide content on porosity and strength of porous mullite-bonded silicon carbide ceramics[J].Journal of the Ceramic Society of Japan,2011,119(1389):367-370.
[12]Kumar B V M,Eom J H,Kim Y W,et al.Effect of aluminum source on flexural strength of mullite-bonded porous silicon carbide ceramics[J].Journal of the Ceramic Society of Japan,2010,118(1373):13-18.
[13]Alvin M A.Assessment of ceramic and metal media filters in advanced power systems[C]//American Society of Mechanical Engineers Turbomachinery Exposition 2001:Power for Land,Sea,&Air.2001:V002T01A015-V002T01A023.
[14]罗志勇,刘开琪,韩伟,等.不同含铝微粉对原位反应结合SiC多孔陶瓷膜支撑体性能的影响[J].耐火材料,2018,52(5):321-325.Luo Z Y,Liu K Q,Han W,et al.Effect of different alumina-containing powders on the properties of in-situ reaction-bonded porous SiC membrane support[J].Refractories,2018,52(5):321-325.
[15]罗明华,曾可令.多孔陶瓷的表征与性能测试技术[J].佛山陶瓷,2002,2(85):3-6.Luo M H,Zeng K L.Characterization and testing technology of porous ceramics[J].Foshan Ceram,2002,2(85):3-6.
[16]周谟仁.流体力学泵与风机[M].北京:中国建筑工业出版社,1979,51:88-124.Zhou M R.Hydromechanic pump and fan[M].Beijing:China Architecture&Building Press,1979,51:88-124.