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将发泡聚苯乙烯小球(epispastic polystyrene,EPS)排列成有序的模板,通过离心成型技术制备孔壁致密、孔径均匀的Al2O3-ZrO2泡沫陶瓷。观察了EPS模板的可压缩特性,分析了浆料固相含量对离心成型过程中物质分离现象的影响,研究了不同烧结温度对Al2O3-ZrO2泡沫陶瓷的烧结密度、孔隙率和压缩强度的影响并表征了宏观孔结构和孔壁断面的微观结构。结果表明:用50%(体积分数)固相含量的浆料可制备出孔壁均匀的样品,在样品的不同部位,Al2O3和ZrO2的分布及相对含量基本相同,物质分离现象被很好的抑制。随着烧结温度的从1450℃提高到1600℃,Al2O3-ZrO2泡沫陶瓷的烧结密度增加、孔隙率降低。在1550℃烧结2h,样品的抗压强度可达2.07MPa。
Abstract：Al2O3-ZrO2 ceramic foam with dense cell walls and a uniform cell structure were fabricated by the centrifugation method using epispastic polystyrene (EPS) spheres as the template. The compressibility of the EPS template was observed and the effect of solid content of slurries on mass segregation during the centrifugation process was analyzed. The effects of the sintering temperature on density, porosity and compressive strength of Al2O3-ZrO2 ceramic foam were studied. The macrostructure of cells and the micro-structure of cross-sections of the cell walls were also observed. The results show that Al2O3-ZrO2 ceramic foam with uniform cell walls can be prepared using slurries of 50% (in volume) solid content. The distribution and relative amount of Al2O3 and ZrO2 phases are approximately the same at different positions of the specimen, indicating that no obvious mass segregation had occurred during the centrifugal process. With the increase of sintering temperature in the range of 1 450 ℃ to 1 600 ℃, the sintered density of Al2O3-ZrO2 ceramic increases and the porosity decreases. After sintering at 1 550 ℃ for 2 h, the compressive strength of the Al2O3-ZrO2 ceramic foam is 2.07 MPa.
[1]MONTANARO L,JORAND Y,FANTOZZI G,et al.Ceramic foams by powder processing[J].J Eur Ceram Soc,1998,18(9):1339-1350.
[2]ZHANG Y H.Microstructures and mechanical properties of silicon nitride bonded silicon carbide ceramic foams[J].Mater Res Bull,2004,39(6):755-761.
[3]YANG S M,COOMBS N,GEOFFERY A.Micromolding in inverted polymer opals(MIPO):synthesis of hexagonal mesoporous silica opals[J].Adv Mater,2000,12(24):1940-1943.
[4]DAVIS J B,KRISTOFFERSSON A.Fabrication and crack deflection in ceramic laminates with porous interplayer[J].J Am Ceram Soc,2000,83(10):2369-2374.
[5]戴斌煜,陈同彩,商景利,等.氧化镁、氧化铈复合部分稳定氧化锆泡沫陶瓷的显微结构[J].硅酸盐学报,2007,35(2):192-198.DAI Binyu,CHEN Tongcai,SHANG Jingli,et al.J Chin Ceram Soc(in Chinese),2007,35(2):192-198.
[6]LEE B T,LEE K H,HIRAGA K.Stress-induced phase transformation of ZrO2in ZrO2(3mol%Y2O3)-25vol%Al2O3composite studied by transmission electron microscopy[J].Scr Mater,1998,38(7):1101-1107.
[7]KISHINO J,NISHIYAMA A,SAKUMA T.Mechanical properties of sinter-forged Al2O3-ZrO2ceramics[J].J Mater Sci,1996,31(18):4991-4995.
[8]LOCKETT M J,AL-HABBOOBY H M.Relative particle velocities in two species settling[J].Powder Technol,1974,10(1-2):67-71.
[9]BIRD R B,STEWART W E,LIGHTFOOT E N.Transport Phenomena[M].New York:Wiley,1960.59-63.
[10]MASLIYAH J H.Hindered settling in a multi-species particles system[J].Chem Eng Sci,1979,34(9):1166-1168.
[11]LI X D,NAGASHIMA M,WANG L,et al.Consolidation induced microstructural inhomogeneities in composites prepared by centrifugal slip casting[J].J Jpn Ceram Soc,2003,111(12):890-896.
基本信息:
中图分类号:TQ174.1
引用信息:
[1]于景媛,孙旭东,李强,等.聚合物模板法制备氧化铝-氧化锆泡沫陶瓷[J].硅酸盐学报,2007,No.219(08):1086-1091.
基金信息:
国家杰出青年基金(50425413);; 国家自然科学基金(50372009)资助项目
2007-08-15
2007-08-15