정전 분무 공정으로 제조된 Fe-Cr-Al 분말 다공체 금속의고온 산화 특성에 미치는 기공 크기의 영향
Effect of Cell Size on the High Temperature Oxidation Properties of Fe-Cr-Al Powder Porous Metal Manufactured by Electro-spray Process
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Fe-Cr-Al powder porous metal was manufactured by using new electro-spray process. First, ultra-finefecralloy powders were produced by using the submerged electric wire explosion process. Evenly distributed colloid(0.05~0.5% powders) was dispersed on Polyurethane foam through the electro-spray process. And then degreasing andsintering processes were conduced. In order to examine the effect of cell size (200 μm, 450 μm, 500 μm) in process,pre-samples were sintered for two hours at temperature of 1450oC, in H2 atmospheres. A 24-hour thermo gravimetricanalysis test was conducted at 1000oC in a 79% N2 + 21% O2 to investigate the high temperature oxidation behavior ofpowder porous metal. The results of the high temperature oxidation tests showed that oxidation resistance increased withincreasing cell size. In the 200 μm porous metal with a thinner strut and larger specific surface area, the depletion ofthe stabilizing elements such as Al and Cr occurred more quickly during the high-temperature oxidation compared withthe 450, 500 μm porous metals.
Abstract
Fe-Cr-Al powder porous metal was manufactured by using new electro-spray process. First, ultra-finefecralloy powders were produced by using the submerged electric wire explosion process. Evenly distributed colloid(0.05~0.5% powders) was dispersed on Polyurethane foam through the electro-spray process. And then degreasing andsintering processes were conduced. In order to examine the effect of cell size (200 μm, 450 μm, 500 μm) in process,pre-samples were sintered for two hours at temperature of 1450oC, in H2 atmospheres. A 24-hour thermo gravimetricanalysis test was conducted at 1000oC in a 79% N2 + 21% O2 to investigate the high temperature oxidation behavior ofpowder porous metal. The results of the high temperature oxidation tests showed that oxidation resistance increased withincreasing cell size. In the 200 μm porous metal with a thinner strut and larger specific surface area, the depletion ofthe stabilizing elements such as Al and Cr occurred more quickly during the high-temperature oxidation compared withthe 450, 500 μm porous metals.
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