Increased Mechanical Stability and Thermal Conductivity of Alumina Reticulated Porous Ceramics (RPC) by Nanoparticle Infiltration Processing

被引：23
作者：
Rannabauer, Stefan [1 ]
Soeffker, Gerrit-Maximilian [1 ]
Scheunemann, Marcel [1 ]
Betke, Ulf [2 ]
Scheffler, Michael [1 ]
机构：
[1] Otto von Guericke Univ, Inst Mat & Joining Technol Nonmetall Inorgan Mat, Grosse Steinernetischstr 6, D-39104 Magdeburg, Germany
[2] Otto von Guericke Univ, Chem Inst Ind Chem, Univ Pl 2, D-39106 Magdeburg, Germany
来源：
ADVANCED ENGINEERING MATERIALS | 2017年 / 19卷 / 10期
关键词：
alumina foam; compressive strength porosity correlation; nanoparticle infiltration; porous ceramic; thermal conductivity; FOAMS; BEHAVIOR;
D O I：
10.1002/adem.201700211
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Infiltration processing of reticulated porous alumina ceramics (RPC) from reticulated foam manufacturing is investigated by micro computed tomography. Infiltration is carried out with colloidal alumina slurries. Successful infiltration is found to be a function of the RPCs starting microstructure and the particle size of the alumina in the colloidal infiltration system. Suitable infiltration conditions are specified. As a result, RPCs with a low relative density show a fivefold compressive strength after infiltration, as compared to their non-infiltrated RPC counterparts. The highest strength of infiltration processed alumina RPCs at a porosity of 90% is found to be 1.6 MPa, and besides a significant increase of the compressive strength, the thermal conductivity is improved to be 1.5 W m(-1) K-1 after infiltration.
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页数：9
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