Production of Ni-Al Foams with Hierarchical Porosity

DOI Web Site 参考文献18件
  • Asavavisithchai Seksak
    Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University
  • Lorlekpech Benjaporn
    Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University
  • Muangyai Supachart
    Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University

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説明

Open-cell nickel aluminide (Ni-Al) intermetallics foams have attracted much attention in industries at which high temperature and severe environment are concerned, due to their good physical and chemical properties. A combination of different pore structures and morphologies in a single monolithic matrix can extend the properties of a material from which a wide range of applications can be applied. In the present study, open-cell Ni-Al intermetallic foams with hierarchical porosities have been developed through a sintering and dissolution process (SDP) and reactive synthesis techniques. The carbamide particles of various contents were used as a space holder material to create macropores in the foams. Micropores were formed as the result of to the formation of initial fine pores between the powders in the compacts, the volatilization of gases evolved during reactive sintering and different diffusion coefficients between Ni and Al. After sintering, only Ni3Al is present in the matrix.

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