Fabrication of Composite Unidirectional Cellular Metals by Using Explosive Compaction

Masatoshi Nishi,Matej Vesenjak,Zoran Ren,Kazuyuki Hokamoto,Shigeru Tanaka

doi:10.3390/met10020193

Masatoshi Nishi, Matej Vesenjak + Show 3 more

Open Access

https://doi.org/10.3390/met10020193

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Abstract

Development of a small and highly efficient heat exchanger is an important issue for energy saving. In this study, the fabrication method of unidirectional (UniPore) composite cellular structure with long and uniform unidirectional cells was investigated to be applied as a heat exchanger. The composite UniPore structure was achieved by the unique fabrication method based on the explosive compaction of a particular arrangement of thin copper and stainless steel pipes. Slightly smaller thin stainless steel pipes filled with paraffin are inserted into small thin copper pipes, which are then arranged inside bigger and thicker outer copper pipes. Such an arrangement of pipes is placed centrally into a cylindrical explosion container and surrounded with explosive. Upon explosive detonation, the pipes are compacted and welded together, which results in a UniPore structure with a stainless steel covered inner surface of unidirectional pores to improve the corrosion resistance and high temperature resistance performance. Two different composite UniPore structures arrangements were studied. The microstructure of the new composite UniPore structure was investigated to confirm good bonding between the components (pipes).

Highlights

Cellular metals with countless small pores have various applicable characteristics such as low density, efficient damping, high grade of deformation, high-energy absorption capability, durability in dynamic loadings, and high thermal and acoustic isolation [1,2]
UniPoreofstructure with longitudinal pores was The investigated in method this study
Two assembly arrangements copper UniPore stainless steel pipesstainless layered at the inner assembly of the copper

Summary

Introduction

Cellular metals with countless small pores have various applicable characteristics such as low density, efficient damping, high grade of deformation, high-energy absorption capability, durability in dynamic loadings, and high thermal and acoustic isolation [1,2]. They can be used in a wide range of applications, since various (multi) functions can be obtained by a proper combination of the pore shape/size/distribution and base metal. Hokamoto et al proposed the fabrication method of the UniPore copper structure with an outer copper pipe completely filled with smaller inner copper pipes [8,9,10,11].

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