Pore structure control for porous FeAl intermetallics

Pore structure control methods for porous FeAl intermetallics were studied in this paper based on pore formation mechanism. A large range of pore structure parameters can be obtained through fabrication parameter adjustment in porous FeAl preparation procedure. Open porosity and maximum pore size of porous FeAl have a direct proportional relationship to the powder size of raw materials and an inversely proportional relationship to the pressing pressure. The relationship between maximum pore size (d _m) and raw material powder size (d _p) can be determined as ^dm=0.40 ^dP. Open porosity and maximum pore size decrease with increasing holding time at solid diffusion reactive procedure. The quantitative relationship between open porosity (θ) and holding time (t) at 600 °C is θ=49.7-0. 1t(60≤t≤240); the quantitative relationship between maximum pore size (d _m) and holding time (t) at 600 °C is ^dm=20.3-0. 065t(60≤t≤240). © 2012 Elsevier Ltd. All rights reserved.