Ni-Doping Alumina Foams for Fabricating MMCs by Pressureless Infiltration Using Fe Alloy
The preparation of Ni-doping alumina foams as precursors for MMCs (Metal Matrix Composites) fabrication was studied. Alumina foams were successfully adulterated with Ni using organic foam impregnation technique. Uniform Ni particles were distributed in alumina struts after they were sintered in a vacuum furnace. At the crucial infiltration step, an inducer such as elemental Ni melted so that interpenetrating channels were created in the ceramics. In contact with Fe melt, the metal matrix could spontaneously infiltrate in alumina foams struts. The influence of infiltration was subsequently investigated by SEM and EDS. Preliminary results showed that the interface between Ni-doping alumina foams and Fe metal matrix reached a full structural homogeneity and the use of Ni-doping alumina foams enhanced the capability of infiltration when processing continuous three-dimensional interconnected ceramics/metal networks MMCs by pressureless infiltration technique.
Yi-Min Deng, Aibing Yu, Weihua Li and Di Zheng
S. F. Yang et al., "Ni-Doping Alumina Foams for Fabricating MMCs by Pressureless Infiltration Using Fe Alloy", Applied Mechanics and Materials, Vols. 37-38, pp. 712-717, 2010