采用Fe25Cr5Al粉末与增塑剂的混合物,用增塑挤压-烧结法制备了铁铬铝金属蜂窝,确定了挤压、烧结工艺,对烧结蜂窝的宏观结构、微观组织和压缩性能进行了研究.结果表明：挤压料配比为62.5%~72.5%、挤压力为6~9.5 MPa时,挤压蜂窝的表观密度为0.87~0.95 g/cm3;随烧结温度的提高和时间的延长,烧结蜂窝的孔密度及比表面积都提高,孔密度达到31~36个/cm2,比表面积达到1.95~2.19 mm2/mm3;烧结后蜂窝由α-Fe、Al-Cr、Al-Fe金属间化合物及Cr2O3、Al2O3组成;径向压缩为单一层状屈服,轴向压缩为多变形带屈服;随表观密度的提高,屈服强度提高,表观密度为0.76~0.94 g/cm3时,径向屈服强度为1.4~6.5 MPa,表观密度为0.78~0.89 g/cm3时,轴向屈服强度为8.2~15.3 MPa.

Fe25Cr5Al honeycomb has been fabricated by powder extrusion molding and sintering using a mixture of metal powders and additives.The extrusion molding,effects of sintering temperature and time on the macro and micro structure,and compressive behavior of the honeycomb have been studied.The extruded honeycomb′s apparent density was 0.87-0.95 g/cm3 while extrusion pressure and composition of powder mixture were 6-9.5 MPa and 0.625-0.725 respectively.The geometric structure parameters,such as cell number ( in the range) and specific surface area( in the range of 1.95-2.19 mm2/mm3),increased with the increasing of sintering temperature and time.The sintering microstructure consised of α-Fe,Al-Cr and Al-Fe intermetallics,Cr2O3 and Al2O3.The compressive strength varied with the apparent density.In the transverse direction,the compressive deformation involved single cell layer yielding and the compressive strength was in the range of 1.4-6.5 MPa (with apparent density 0.76-0.94 g/cm3),however,in the longitudinal direction,the deformation was related to a mechanism of multi deformation band yielding and the yield strength was in the range of 8.2-15.3 MPa (with apparent density 0.78-0.89 g/cm3).