Manufacture And Property Research On FeAl Based Porous Material

Porous material, as a kind of excellent functional structure materials, is widely used in various occasions, such as gas liquid filtration, separation, coal gasfication, flue gas purification, catalyst carrier, et al. At high temperatures oxidizing and sulfidizing corrosion environment, the conventional materials are difficult to meet the increasing challenges. FeAl based porous material gets more and more attention for its excellent resistant and mechanical manufacture performances.This paper studied the controllable preparation of FeAl intermatellic compounds porous materials by the means of elemental powder solid phase diffusion followed by high temperature reaction sintering technology. Fe/Al composite powders were produced by high-energy ball milling. By the means of DSC, XRD and SEM, the microstructure evolution of Fe/Al powders affected by milling time and milling rotational speed was studied. The effect of process parameters on volume expansion, porosity, phase response as well as the hole forming were investigated. High temperature oxidation, sulfidation and porous material permeability experiment device were built for the properties characterization of the prepared FeAl based porous material. Result showed that, at 600℃after 50h air oxidation, the FeAl porous material had a weight gain of 0.06%, far better than the 0.15% weight gain of 316L porous material; at 600℃after 60h sulfidation, FeAl porous material had a weight gain of 0.13%, far better than the 5.3%weight gain of 316L porous material. The most probable pore size of prepared FeAl porous material was 8μm and the permeability was 0.7×10-12m2. The prepared porous material manufactured by elemental powder solid phase diffusion followed by high temperature reaction sintering process had excellent comprehensive performance.