高空隙率・低圧力損失の金属多孔質焼結体の開発

概要

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We found that the gas of a decomposed binder can be exhausted from a green body smoothly by means of extracting Space holder (SH) by the solvent before heating for debinding in the case that the volume fraction of SH in the green body is over 70 %, where total volume fraction of SH and the metal powder is 100 %. As a result, we could obtain the porous metal with porosity exceeding 90 % by the SH. This porous metal consists of the voids formed by extracting SH and the skeleton with the pores originated from the space among the metal particles. The porosity and the interconnecting frequency and the area between the voids became larger by increasing the volume fraction, the diameter of SH, the frequency and the area of the contact between SHs in the green body. Furthermore, the pore diameter in the skeleton became larger by adding the small SH of several times the diameter of the metal particle. These effects improved the air permeability and lowered the pressure drop.
社団法人粉体粉末冶金協会の論文
2012-06-15