Abstract：Porous alumina ceramics were prepared by using calcined α-Al2O3 as raw material,nano silica sol as high temperature binder and carboxymethy cellulose as molding binder with processes of mixing,aging,molding and sintering.The effect of silica sol addition on sintering properties was investigated by test method of SEM and XRD. The linear shrinkage,volume density,porosity and flexural strength were also tested.The results show that the quartz silicon dioxide which is pyrolysed product from silica sol could bond the alumina particles together to form porous ceramics and improve the mechanical properties.The essence of silica sol bonding is physical bonding.The silicon dioxide in the sol begins to react with alumina to form mullite when the sintering temperature reaches 1500 ℃,and the porous ceramics tend to be compact with excellence mechanical properties.The flexural strength is about (105.5±8.0) MPa.The content of mullite phase increases with sintering temperature.However,with much higher content of mullite generation,the porosity increases and the mechanical performance degrades.The porous alumina ceramics with excellence performance can be obtained when the sintering temperature is between 1400 ℃ and 1500 ℃.
林洪玉, 李晓鸿, 陈璐, 杨波, 姚森, 曾小州, 李安林, 黎阳. 硅溶胶添加对氧化铝多孔陶瓷烧结性能的影响[J]. 材料工程, 2021, 49(5): 151-156.
LIN Hong-yu, LI Xiao-hong, CHEN Lu, YANG Bo, YAO Sen, ZENG Xiao-zhou, LI An-lin, LI Yang. Effect of silica sol addition on sintering properties of porous alumina ceramics. Journal of Materials Engineering, 2021, 49(5): 151-156.
[1] WU P, XU Y, HUANG Z, et al.A review of preparation techniques of porous ceramic membranes[J].Journal of Ceramic Processing Research, 2015, 16(1):102-106. [2] NIE Z G, LIN Y Y.Fabrication of porous alumina ceramics using hollow microspheres as the pore-forming agent[J].Journal of the Korean Society of Manufacturing Technology Engineers, 2015, 24(4):368-373. [3] JUETTNER T, MOERTEL H, SVINKA V, et al.Structure of kaoline-alumina based foam ceramics for high temperature applications[J].Journal of the European Ceramic Society, 2007, 27(2/3):1435-1441. [4] AHMAD R, HA J H, SONG I H.Particle-stabilized ultra-low density zirconia toughened alumina foams[J].Journal of the European Ceramic Society, 2013, 33(13/14):2559-2564. [5] 黄坤模, 刘涛, 徐兆芳, 等.Al2O3多孔陶瓷的制备及性能[J].中国陶瓷, 2018, 54(5):11-15. HUAMG K M, LIU T, XU Z F, et al.Preparation and properties of porous alumina ceramics[J].China Ceramics, 2018, 54(5):11-15. [6] 黎阳, 宫营芳, 汪林.低温制备氧化铝多孔陶瓷[J].中国陶瓷, 2014, 50(5):47-50. LI Y, GONG Y F, WANG L.Preparation of alumina porous ceramics at low temperature[J].China Ceramics, 2014, 50(5):47-50. [7] 孔德玉, 杨辉, 韦苏, 等.硅溶胶分散氧化铝浆料的免脱气注凝成型工艺[J].硅酸盐学报, 2005, 33(9):1070-1074. KONG D Y, YANG H, WEI S, et al.Gelcasting of alumina slurry dispersed in silica sol without de-airing process[J].Journal of the Chinese Ceramic Society, 2005, 33(9):1070-1074. [8] 蔡艳芝, 杨彬, 王刚.硅溶胶对莫来石结合刚玉质耐火材料力学性能的影响[J].硅酸盐学报, 2007, 35(5):664-670. CAI Y Z, YANG B, WANG G.Effect of silica sol on mechanical properties of mullite bonded corundum refractory[J].Journal of the Chinese Ceramic Society, 2007, 35(5):664-670. [9] 朱新文, 江东亮, 谭寿洪, 等.氧化铝粉体在硅溶胶中分散行为的研究[J].硅酸盐学报, 2001, 29(3):263-266. ZHU X W, JIANG D L, TAN S H, et al.Study of dispersion behavior of alumina powders in silica sol[J].Journal of the Chinese Ceramic Society, 2001, 29(3);263-266. [10] LIDEN E, KARLSSON S, TOKARZ B.Silica sols as refractory fibre binders[J].Journal of the European Ceramic Society, 2001, 21(6):795-808. [11] SIMENDIC B, RADONJIC L.Low temperature transformation of alumino-silicate gels[J].Ceramics International, 1998, 24(7):553-557. [12] KONG D, YANG H, WEI S, et al.Gel-casting without de-airing process using silica sol as a binder[J].Ceramics International, 2007, 33(2):133-139. [13] IVANKOVIC H, TKALCE E, NASS R, et al.Correlation of the precursor type with densification behavior and microstructure of sintered mullite ceramics[J].Journal of the European Ceramic Society, 2003, 23(2):283-292. [14] 马红萍, 祝邦文, 王建武, 等.硅溶胶的凝胶化包覆对氧化铝烧结性能的影响[J].稀有金属材料与工程, 2010, 39(增刊2):463-466. MA H P, ZHU B W, WANG J W, et al.Influence of gelation coating of colloidal silica on sintering properties of Al2O3 ceramics[J].Rare Metal Materials and Engineering, 2010, 39(Suppl2):463-466. [15] 赵惠忠, 计道珺, 雷中兴, 等.纳米莫来石粉体的合成及其表征[J].硅酸盐学报, 2003, 31(12):1216-1220. ZHAO H Z, JI D J, LEI Z X, et al.Synthesis and characterization of nanosized mullit powder[J].Journal of the Chinese Ceramic Society, 2003, 31(12):1216-1220. [16] 陈照峰, 张立同, 成来飞, 等.硅溶胶强化辅助制备C纤维增韧氧化铝结合莫来石陶瓷基复合材料[J].航空材料学报, 2001, 21(4):28-32, 37. CHEN Z F, ZHANG L T, CHENG L F, et al.Preparation of C fiber reinforced alumina-mullite composite assisted by silica sol infiltration[J].Journal of Aeronautical Materials, 2001, 21(4):28-32, 37. [17] BEHNAM A, SALEH S T.Simultaneous effects of salted water and water flow on asphalt concrete pavement deterioration under freeze-thaw cycle[J].International Journal of Pavement Engineering, 2014, 15(5):383-391.
2021, Vol. 49 
