Research on preparation of Fe-5％Si porous material and its permeability
ThreegroupsofthesameFe-5％Simixedpowderweresinteredathightemperatureat1 050,1 100℃ and 1 150 ℃,respectively,and held for 2 h.Metallographic(OM)and scanning(SEM)microstructure observation and XRD phase analysis were performed for each sample,and the gas permeability was tested by self-assembled porous material performance detector.The results show that higher sintering temperature can generate smaller-pore porous material.The film layer will form on the cross section of the sample sintered at 1 150 ℃.The cross section of Fe-5％Si porous material is composed of oxides of Fe and Si,and the higher the sintering temperature,the fewer types of oxides.There are SiO2,Fe2O3,FeO and Fe2O4 when sintered at 1 050 ℃,Fe3O4,FeO and SiO2 at 1 100 ℃,and FeO and SiO2 at 1 150 ℃.The gas flow rate of the sample at 1 050 ℃ increases significantly with the increase of ventilation pres-sure.When the ventilation pressure is 140 kPa,the gas flow rate is about 9 200 mL/min.The gas flow rate of samples sintered at 1 100 ℃ and 1 150 ℃has little change with the increase of ventilation pres-sure.When the ventilation pressure is 140 kPa,the gas flow rate of both samples is about 1 000 mL/min.
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