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| 1 | High-strength porous alumina ceramics prepared from stable wet foams显示文摘Porous ceramics have been widely used in heat insulation,filtration,and as a catalyst carrier.Ceramics with high porosity and high strength are desired;however,this high porosity commonly results in low strength materials.In this study,porous alumina with high porosity and high strength was prepared by a popular direct foaming method based on particle-stabilized wet foam that used ammonium polyacrylate(PAA)and dodecyl trimethyl ammonium chloride(DTAC)as the dispersant and hydrophobic modifier,respectively.The effects of the dispersant and surfactant contents on the rheological properties of alumina slurries,stability of wet foams,and microstructure and mechanical properties of sintered ceramics were investigated.The microstructure of porous ceramics was regulated using wet foams to achieve high strength.For a given PAA content,the wet foams exhibited increasing stability with increasing DTAC content.The most stable wet foam was successfully obtained with 0.40 wt%PAA and 0.02 wt%DTAC.The corresponding porous alumina ceramics had a porosity of 82%,an average grain size of 0.7μm,and a compressive strength of 39 MPa.However,for a given DTAC content,the wet foams had decreasing stability with increasing PAA content.A possible mechanism to explain these results is analyzed. | Linying WANG Liqiong AN Jin ZHAO Shunzo SHIMAI Xiaojian MAO Jian ZHANG Juan LIU Shiwei WANG | 2021 | Journal of Advanced Ceramics2021，10，4： | 3 |
| 2 | Gelcasting of transparent YAG ceramics by a new gelling system显示文摘 | Xianpeng Qin Guohong Zhou Yan Yang Jian Zhang Xia Shu Shunzo Shimai Shiwei Wang | 2014 | Ceramics International2014，，： | 1 |
| 3 | Fabrication of porous Al2O3 ceramics by rapid gelation and mechanical foaming显示文摘 | Yan Yang Shunzo Shimai Yi Sun Manjiang Dong Hidehiro Kamiya Shiwei Wang | 2013 | Journal of Materials Research2013，，15： | 1 |
| 4 | Room-temperature gelcasting of alumina with a water-soluble copolymer显示文摘 | Yan Yang Shunzo Shimai Shiwei Wang | 2013 | Journal of Materials Research2013，，11： | 1 |
| 5 | Rheological characterization of a geleasting system based on epoxy resin显示文摘 | Xiaojian Mao Shunzo Shimai Shiwei Wang | 2009 | Ceramics International2009，35，： | 1 |
| 6 | Effects of coarse parti- cles on the gelcasting of ceramic foams显示文摘 | Mao Xiaojian Shimai Shunzo Wang Shiwei | 2008 | J Am Ceram Soc2008，91，7： | 1 |
| 7 | High transmittance and grain-orientated alumina ceramics fabricated by adding fine template particles显示文摘Transparent Al_(2)O_(3) ceramics with grains aligned to the c-axis were prepared by adding platelets with a low aspect ratio into fine equiaxed particles.The mixed powders were formed into green bodies using spontaneous coagulation casting and sintered by pressureless sintering and hot-isostatic pressure sintering.Zeta potentials and rheological behavior of the slurries,relative densities of green bodies,and orientation and optical properties of sintered bodies were investigated and discussed.The platelet with a high aspect ratio suppressed densification more seriously during sintering than the one with a low aspect ratio.An excellent oriented structure was obtained when 5 wt%platelets with a low aspect ratio were added,and transparent Al_(2)O_(3) ceramics with grains aligned to c-axis were successfully prepared;the in-line transmittance was 78.4%at 600 nm,which is the highest one in the currently reported literature. | Han CHEN Jin ZHAO Shunzo SHIMAI Xiaojian MAO Jian ZHANG Guohong ZHOU Shiwei WANG Na GU Kai ZHENG | 2022 | Journal of Advanced Ceramics2022，11，4： | 1 |
| 8 | 查看详情显示文摘 | Mao Xiaojian Wang Shiwei Shimai Shunzo | | 0，，： | 1 |
| 9 | Gelcasting of alumina toams consolidated by epoxy resin 显示文摘 | Mao Xiaojian Shimai Shunzo Wang Shiwei | 2008 | J Eur Ceram Soc2008，28，1： | 1 |
| 10 | Gelcasting of alumina foams consolidated by epoxy resin显示文摘 | Xiaojian Mao Shunzo Shimai Shiwei Wang | 2007 | Journal of the European Ceramic Society2007，，1： | 1 |
| 11 | Re-fluidising the aged gel for high-density alumina green body显示文摘A green body with a density as high as possible is critical to diminish the crisis of deformation or cracking when large-size parts are sintered.Here,a new method,i.e.,re-fluidising the aged ceramic gel is developed to prepare the high-density green body.Alumina slurry with 56 vol%solid loading and copolymers of isobutylene and maleic anhydride were aged without vaporisation and re-fluidised by non-intrusive shearing after removing the exuded water.The re-fluidised slurry was re-casted.The resultant wet gel was dried and deboned at a low temperature.The relative density of the obtained green body was 64.6%,1.5%higher than that without aging and re-fluidising.The linear sintering shrinkage of the body decreased by 0.7%.The enhanced green density is explained from the viewpoint of the solid loading and the structure of the slurry. | Xiaolang WU Jin ZHAO Shunzo SHIMAI Xiaojian MAO Jian ZHANG Shiwei WANG | 2022 | Journal of Advanced Ceramics2022，11，9： | 0 |
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