High Temperature Oxidation Behavior of Ni based Porous Metal

Sung-Hwan Choi; Jung-Yeul Yun; Hye-Mun Lee; Young-Min Kong; Byoung-Kee Kim; Kee-Ahn Lee

doi:10.4150/KPMI.2011.18.2.122

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Ni계 다공체 금속의 고온 산화 거동: 최성환, 윤중열, 이혜문, 공영민, 김병기, 이기안
High Temperature Oxidation Behavior of Ni based Porous Metal: Sung-Hwan Choi, Jung-Yeul Yun, Hye-Mun Lee, Young-Min Kong, Byoung-Kee Kim, Kee-Ahn Lee; Journal of Korean Powder Metallurgy Institute 2011;18(2):122-128
DOI: https://doi.org/10.4150/KPMI.2011.18.2.122

¹안동대학교 신소재공학부
²재료연구소 분말기술연구그룹
³재료연구소 분말기술연구그룹
⁴울산대학교 첨단소재공학부
⁵울산대학교 첨단소재공학부
⁶안동대학교 신소재공학부
¹School of Advanced Materials Engineering, Andong National University
²Powder Technology Group, Korea Institute of Materials science
³Powder Technology Group, Korea Institute of Materials science
⁴School of Materials Science Engineering, University of Ulsan
⁵School of Materials Science Engineering, University of Ulsan
⁶School of Advanced Materials Engineering, Andong National University

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Abstract

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.

Keywords: Porous metal;Ni-Fe-Cr-Al;Pore size;High temperature oxidation;Oxidation resistance;Oxide scale;

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