添加Cr合金化FeAl金属间化合物多孔材料的制备及性能

在Fe-25%Al金属间化合物成分基础上,添加铬(Cr)元素进行合金化,通过元素偏扩散-反应合成-烧结的方法制备含Cr的铁铝(FeAl)金属间化合物多孔材料,并采用X射线衍射(XRD)分析反应合成过程中的物相变化,采用孔结构测试仪、排水法、弯曲试验和冲击试验研究Cr含量对FeAl金属间化合物多孔材料孔结构和力学性能的影响,通过静态腐蚀实验研究Cr合金化FeAl多孔材料的耐腐蚀性能。结果表明:Cr含量为20%时,制得的FeAl多孔材料物相仍为单一FeAl相;其中,Cr含量为5%~10%时,FeAl多孔材料的强度和韧性值较高;随Cr含量增加,FeAl多孔材料的孔径和孔隙度均增大,材料的氧化和硫化速率显著降低。

Preparation and properties of porous FeAl intermetallics with Cr ternary additions

Porous materials made from FeAl intermetallic compounds with chromium (Cr) ternary additions were fabricated through a classical powder metallurgy (PM) technology using elemental powder mixtures of Fe/Al/Cr. The phase composition of the samples during the sintering process was investigated by X-ray diffraction (XRD). The effects of Cr content on the pore size, porosity, strength, toughness, and high-temperature corrosive resistance of porous FeAl were studied via the pore-structure test, the archimedes method, bending test, impact test, and static corrosion test, respectively. The results show that porous FeAl intermetallics with 20% Cr presents a single FeAl phase. An optimum mechanical performance can be obtained for porous FeAl with Cr contents ranging from 5% to 10%. With increasing the Cr content, the pore size and porosity of porous FeAl increase with simultaneous decrease of the oxidation and sulfidation rates.