Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (4): 241-247.DOI: 10.11890/1006-7191-104-241

• 研究论文 •    下一篇

Effect of Al Powder and Silica Sol on the Structure and Mechanical Properties of Al2O3-ZrO2 Foams

HassanSharifi1,Mehdi2,Alireza2,M. H. Idris3   

  1. 1. Iran University of Science and Technology
    2. School of Materials and Metallurgical Engineering, Iran University of Science and Technology
    3. Department of Material Engineering, Faculty of Mechanical Engineering, Universti Teknologi Malaysia
  • 收稿日期:2009-11-19 修回日期:2010-02-21 出版日期:2010-08-25 发布日期:2010-08-11
  • 通讯作者: HassanSharifi

Effect of Al powder and silica sol on the structure and mechanical properties of Al2O3-ZrO2 foams

H. Sharifi1, M.Divandari1, A. Khavandi1 , M.H. Idris2   

  1. 1. School of Materials and Metallurgical Engineering, Iran University of Science and Technology,Narmak, 16844 Tehran, Iran
    2. Department of Material Engineering, Faculty of Mechanical Engineering, Universti Teknologi Malaysia, 81310 Skudai, Malaysia
  • Received:2009-11-19 Revised:2010-02-21 Online:2010-08-25 Published:2010-08-11
  • Contact: M. Divandari

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摘要：

Polymeric sponge replication method is one of the ways for ceramic foam production. The existence of central triangular voids in the struts results in a decrease of mechanical properties limiting their applications. To remove this defect, some additives consisting of Al powder particles and silica sol are added to ceramic slurries consisting of Al2O3 and ZrO2 (partially stabilized zirconia). With increasing temperature for pyrolyzing and sintering of raw materials, first the Al powder and then the glass phase which consisted of Al2O3, ZrO2 and SiO2 melted and soaked into hollow struts. SEM investigations showed that the center of foam struts were free of hollows. XRD considerations depicted that a ZrO2 phase with tetragonal crystallographic structure is present in the produced foam which could be the reason of improved toughness and mechanical properties. Compressive strength of foams increased significantly due to the decrease of closed porosity. The Weibull statistical study showed remarkable increasing of the Weibull module and its value for foams with 10, 20 and 30 ppi was 5.91, 6.06 and 6.53 respectively.

Abstract:

Polymeric sponge replication method is one of the common ways for ceramic foam production. The existence of central triangular voids in the struts results in a decrease of mechanical properties limiting their applications. To remove this defect, some additives consisting of Al powder particles and silica sol are added to ceramic slurries consisting of Al2O3 and ZrO2 (partially stabilized zirconia). With increasing temperature for pyrolyzing and sintering of raw materials, first the Al powder and then the glass phase which consisted of melted Al2O3, ZrO2 and SiO2 was soaked into hollow struts. SEM investigations showed that the center of foam struts were free of hollows. XRD considerations depicted that a ZrO2 phase with tetragonal crystallographic structure is present in the produced foam which could be the reason of improved toughness and mechanical properties. Compressive strength of foams increased significantly due to the decrease of closed porosity. The Weibull statistical study showed remarkable increasing of the Weibull module and its value for foams with 10, 20 and 30~ppi was 5.91, 6.06 and 6.53 respectively.

Key words: Ceramic foam, Processing, Strut structure, Al2O3-ZrO2, Weibull modulus