定向冷冻铸造工艺制备的层状SiC多孔陶瓷微观结构分析
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摘要
采用定向冷冻铸造工艺制备层状SiC多孔陶瓷材料,分析了孔隙微观结构,探讨了孔隙的形成机制。研究结果表明:距冷源平面的距离决定孔的隙形貌和分布;试样纵截面可分为致密区、过渡区和层片区;在冰晶生长方向,孔隙形貌由柱状向层状转变,过渡区孔隙呈板条状,孔径(层片厚度)增大。
The SiC porous ceramics material with directional lamellar structure was prepared by directional freeze-casting process. The microstructure of pores was analyzed, and the forming mechanism of pores was discussed. The results show that the distance from cold source plane decides morphology and distribution of pores. The longitudinal cross section of samples can be divided into three regions: compact region, transition region, lamellar region. Along the growth direction of ice crystal, the pore morphology changes from columnar to lamellar and the pores of transition region is lath, and the pore size(lamella thickness) increases.
The SiC porous ceramics material with directional lamellar structure was prepared by directional freeze-casting process. The microstructure of pores was analyzed, and the forming mechanism of pores was discussed. The results show that the distance from cold source plane decides morphology and distribution of pores. The longitudinal cross section of samples can be divided into three regions: compact region, transition region, lamellar region. Along the growth direction of ice crystal, the pore morphology changes from columnar to lamellar and the pores of transition region is lath, and the pore size(lamella thickness) increases.
引文
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[2]奚巨伟.冷冻铸造-熔渗技术制备层状Al-Si(-Mg)/Al2O3复合材料[D].长春:吉林大学,2014.
[3]Soboyejo W O,Ye F,Chen L C,et al.Effects of reinforcement morphology on the fatigue and fracture behavior of Mo Si2/Nb composites[J].Acta Materialia,1996,44(5):2027-2041.
[4]Yasrebi M,Kim G H,Gunnison K E,et al.Biomimetic processing of ceramics and ceramic-metal composites[J].Mrs Proceedings,2011,180:625-635.
[5]Nangrejo M R,Bao X.Preparation of silicon carbide-silicon nitride composite foams from pre-ceramic polymers[J].Journal of the European Ceramic Society,2000,22(1):1777-1785.
[6]Branko M,Biljana B,Adela E,et al.Preparation of porous silica ceramics using the wood template[J].Materials and Manufacturing Processes,2009,24(10/11):1109-1113.
[7]Li S H,De Wijn J R,Layrolle P,et al.Synthesis of macroporous hydroxyapatite scaffolds for bone tissue engineering[J].Journal of Biomedical Materials Research,2002,61(1):109-120.
[8]Liu D M.Influence of porosity and pore size on the compressive strength of porous hydroxyapatite ceramic[J].Ceramics International,1997,23(2):135-139.
[9]Binks B P.Macroporous silica from solid-stabilized emulsion templates[J].Advanced Materials,2002,14(24):1824-1827.
[10]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.
[11]刘岗,严岩.冷冻干燥法制备多孔陶瓷研究进展[J].无机材料学报,2014,29(6):571-583.
[12]Deville.Freeze-casting of porous ceramics:a review of current achievements and issues[J].Advanced Engineering Materials,2008,10(3):155-169.
[13]Deville S,Saiz E,Nalla R K,et al.Freezing as a path to bu ild complex composites[J].Science,2006,311(5760):515-518.
[14]Deville S,Saiz E,Tomsia A P.Ice-templated porous alumina structures[J].Acta Materialia,2007,55(6):1965-1974.
[15]Launey M E,Munch E,Alsem D H,et al.A novel biomimetic approach to the design of high-performance ceramic-metal composites[J].Journal of the Royal Society Interface,2009,7(46):741-753.
[16]Roy S,Wanner A.Metal/ceramic composites from freeze-cast ceramic preforms:Domain structure and elastic properties[J].Composites Science&Technology,2008,68(5):1136-1143.
[17]Liu Q,Ye F,Gao Y,et al.Fabrication of a new SiC/2024Al co-continuous composite with lamellar microstructure and high mechanical properties[J].Journal of Alloys&Compounds,2014,585(6):146-153.