- High Temperature Oxidation Behavior of Ni based Porous Metal
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Sung-Hwan Choi, Jung-Yeul Yun, Hye-Mun Lee, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee
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J Korean Powder Metall Inst. 2011;18(2):122-128.
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DOI: https://doi.org/10.4150/KPMI.2011.18.2.122
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- This study investigated the high temperature oxidation behavior of Ni-22.4%Fe-22%Cr-6%Al (wt.%) porous metal. Two types of open porous metals with different pore sizes of 30 PPI and 40 PPI (pore per inch) were used. A 24-hour TGA test was conducted at three different temperatures of 900°C, 1000°C and 1100°C. The results of the BET analysis revealed that the specific surface area increased as the pore size decreased from 30 PPI to 40 PPI. The oxidation resistance of porous metal decreased with decreasing pore size. As the temperature increased, the oxidation weight gain of the porous metal also increased. Porous metals mainly created oxides such as Al_2O_3, Cr_2O_3, NiAl_2O_4, and NiCr_2O_4. In the 40 PPI porous metal with small pore size and larger specific surface area, the depletion of stabilizing elements such as Al and Cr occurred more quickly during oxidation compared to the 30 PPI porous metal. Ni-Fe-Cr-Al porous metal's high-temperature oxidation micro-mechanism was also discussed.
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Citations
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