| 학회 |
한국재료학회 |
| 학술대회 |
2009년 봄 (05/21 ~ 05/22, 무주리조트) |
| 권호 |
15권 1호 |
| 발표분야 |
에너지환경재료 |
| 제목 |
수소생성용 활성촉매로서의 적용을 위한 Ni/Ni3Al 2상합금의 미세조직제어 및 전기화학적 선택부식에 의한 표면개질 |
| 초록 |
Catalytic activity is expected to be higher on rough and irregular surface having larger surface area compared with flat surface. In order to make active Ni3Al catalyst having such irregular surface, we here performed the electrochemically selective etching of γ matrix using Ni(γ)/Ni3Al(γ´) two-phase foils. In this study, we examined surface morphologies of the two-phase foils having various two-phase structures controlled by cold-rolling and heat-treatment after the electrochemical etching of γ matrix. The electrochemical etching was performed in the electrolyte of distilled water with 1wt.% (NH4)2SO4 and 1wt.% citric acid at a constant potential of 1.75V. The foils were cold-rolled and subsequently heat-treated at 873, 1073 and 1273K for 0.5h. The foil surface showed the γ-etched microstructure after the electrochemical etching: the matrix was selectively etched, leaving the heterogeneously distributed γ´-precipitates on the surface. It turned out that the rough and irregular γ´ surface, which is expected to show high catalytic activity, can be formed. |
| 저자 |
이혜연1, Masahiko Demura2, Ya Xu2, Toshiyuki Hirano2, 위당문1
|
| 소속 |
1KAIST, 2NIMS |
| 키워드 |
Ni/Ni3Al 2상합금; 열처리; 선택적 부식; 표면개질
|
| E-Mail |
|
