In order to develop a process for manufacturing a composite structure of an intermetallic compound foam and a hollow material, the firing and pore form of the Al-Ni precursor in a steel pipe are investigated. When the Al-Ni precursor is foamed in a hollow pipe, if the temperature distribution inside the precursor is uneven, the pore shape distribution becomes uneven. In free foaming, no anisotropy is observed in the foaming direction and the pore shape is isotropic. However, in the hollow pipe, the pipe expands in the pipe axis direction and fills the pipe. The interfacial adhesion between Al3Ni foam and steel pipe is excellent, and interfacial pore and reaction layer are not observed by SEM. In free foaming, the porosity is 90 %, but it decreases to about 80 % in the foam in the pipe. In the pipe foaming, most of the pore shape appears elongated in the pipe direction in the vicinity of the pipe, and this tendency is more remarkable when the inside pipe diameter is small. It can be seen that the pore size of the foam sample in the pipe is larger than that of free foam, because coarse pores remain after solidification of the foam because the shape of the foam is supported by the pipe. The vertical/horizontal length ratio expands along the pipe axis direction by foaming in the pipe, and therefore circularity is reduced.

Abstract
1. 서 론
2. 실험 방법
3. 실험 결과 및 고찰
    3.1 Al-Ni계 전구체의 연소합성 발포
    3.2 할로우 파이프 설치에 따른 발포 특성변화
    3.3 할로우 파이프 내의 충진거동
    3.4 기공형상 관찰
4. 결 론
References

• 한창석(호서대학교 자동차ICT공학과) | Chang-Suk Han (Dept. of ICT Automotive Engineering, Hoseo University) Corresponding author
• 진성균(호서대학교 자동차ICT공학과) | Sung-Yooun Jin (Dept. of ICT Automotive Engineering, Hoseo University)
• 권혁구(호서대학교 환경공학과) | Hyuk-Ku Kwon (Dept. of Environmental Engineering, Hoseo University)