Abstract

A new manufacturing process of Fe-Cr-Al powder porous metal was attempted. First, ultra-fine fecralloy powders were produced by using the submerged electric wire explosion process. Evenly distributed colloid (0.05~0.5% powders) was dispersed on PU (Polyurethane) foam through the electrospray process. And then degreasing and sintering processes were conduced. In order to examine the effect of sintering temperature in process, pre-samples were sintered for two hours at temperatures of 1350°C, 1400°C, 1450°C, and 1500°C, respectively, in H_2 atmospheres. A 24-hour TGA (thermo gravimetric analysis) test was conducted at 1000°C in a 79% N_2+21% O_2 to investigate the high temperature oxidation behavior of powder porous metal. The results of the high temperature oxidation tests showed that oxidation resistance increased with increasing sintering temperature (2.57% oxidation weight gain at 1500°C sintered specimen). The high temperature oxidation mechanism of newly manufactured Fe-Cr-Al powder porous metal was also discussed.

• Keywords: Powder porous metal;Electric wire explosion;Electrospray;Fecralloy;High temperature oxidation;Sintering temperature;