SINTERED FE-AL BASED POROUS ALLOY MATERIAL WITH HIGH-TEMPERATURE OXIDIZATION RESISTANCE AND FILTERING ELEMENTS

摘要

Disclosed are a sintered Fe—Al based alloy porous material with high temperature oxidation resistance and a filter element using same. The porous material has a porosity of 30-60% and an average pore diameter of 0.5-50 μm, and has that: a) it mainly consists of three elements of Fe, Al and Cr, and the total weight of these three elements accounts for at least 90% of the weight of the porous material, wherein the weight of Fe is 60-85% of the total weight of Fe and Al, and the weight of Cr is 10-30% of the total weight of Fe, Al and Cr; b) the Cr in the porous material mainly presents in the form of a chromium compound of a Fe—Al based compound, or mainly presents in the form of a chromium compound of the Fe—Al based compound and FeCr, and is almost uniformly dispersed in the porous material; and c) it has a tensile strength ≧45 MPa, an air flux ≧80 m3/m2·KPa·h for the sintered Fe—Al based alloy porous material with a thickness ≦5 mm, a weight loss rate of at most 0.5% after being immersed into a NaOH solution with a mass fraction of 10% at room temperature for 15 days, and a material weight gain rate of at most 0.25% after being kept at 1000° C. in air for 90 hours.

主权项

1. A sintered Fe—Al based alloy porous material with high temperature oxidation resistance, having a porosity of 30-60% and an average pore diameter of 0.5-50 μm, is characterized in that:
a) it mainly consists of three elements of Fe, Al and Cr, and the total weight of these three elements accounts for at least 90% of the weight of the sintered Fe—Al based alloy porous material, wherein the weight of Fe is 60-85% of the total weight of Fe and Al, and the weight of Cr is 10-30% of the total weight of Fe, Al and Cr; b) the Cr in the sintered Fe—Al based alloy porous material mainly presents in the form of a chromium compound of a Fe—Al based compound, or mainly presents in the form of a chromium compound of a Fe—Al based compound and FeCr, and is almost uniformly dispersed in the sintered Fe—Al based alloy porous material; and c) it has a tensile strength ≧45 MPa, an air flux ≧80 m3/m2·KPa·h for the sintered Fe—Al based alloy porous material with a thickness ≦5 mm, a weight loss rate of at most 0.5% after being immersed into a NaOH solution with a mass fraction of 10% at room temperature for 15 days, and a material weight gain rate of at most 0.25% after being kept at 1000° C. in air for 90 hours.