Fabrication of Porous Fe/TiB2 Composites by Reactive Precursor Method


  •  Osayoshi Kato    
  •  Makoto Kobashi    
  •  Naoyuki Kanetake    

Abstract

Porous Fe/TiB2 composites were fabricated by a reactive precursor method. Fundamentally, iron, titanium and boron powders were blended to synthesize 20 to 70vol%TiB2 particles in Fe/TiB2 composites after the combustion reaction. Additionally, various foaming agent powders (CaCO3, MgCO3, SrCO3, TiH2, ZrH2 and C) were added to the blended powder. The blended powder compact was heated to induce the combustion reaction. The specimen prepared with carbon had large pores and high porosity (the maximum porosity was 60% and the pore size was about 800 µm). The reasons why the porosity increases are twofold; (i) the melting point of iron is decreased by carburizing and (ii) carbon is oxidized during the combustion process and the formation of gaseous CO results in generating the pores.


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