Effect of Graded Pore Distribution on Thermal Insulation of Metal Foam

DOI Web Site 11 Citations 13 References

Bibliographic Information

Other Title
  • ポーラス金属の断熱特性に及ぼす傾斜的気孔分布の影響

Description

  Metal foams are attractive materials for thermal insulators because of their low thermal conductivity. Coefficient of thermal expansion (CTE) of metal foams is the same as that of cell wall materials. Therefore, the effect of thermal stress induced by a change in CTE, which is severe in the thermal barrier coating by ceramics, becomes negligible. In this study, we focus on designing metal foams as thermal insulators. The effect of porosity and pore shape on the thermal conductivity was calculated by micromechanical analysis. It was revealed that oblate spheroidal pores are effective to decrease the thermal conductivity. Micromechanical analysis also revealed that the thermal conductivity can be controlled by pore distribution of the metal foam. That is, metal foam with graded porosity has low thermal conductivity compared to uniform porosity. A diffusion-bonding process enabled to manufacture 5083 aluminum alloy preforms containing TiH2 particles as a foaming agent. Foaming test by directional heating enabled to manufacture closed-cell 5083 aluminum alloy foams having both oblate spheroidal pores and graded pore distribution.<br>

Journal

Citations (11)*help

See more

References(13)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top