COMPOSITE MATERIAL OF METAL AND POROUS SUBSTRATE, AND PRODUCTION METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a composite material of a metal and a porous substrate, which makes the metal carried on the porous substrate without damaging its shape and surface area, and makes the metal into a granular or acicular shape to further enlarge the surface area.

SOLUTION: This production method comprises the steps of: immersing the porous substrate in a solution containing ions of a metal M3having a lower oxidation-reduction potential than a metal M2while applying an ultrasonic wave to make the porous substrate carry the metal ions M3; immersing the porous substrate having carried the metal ions M3in pure water or a diluted acid solution; immersing the porous substrate carrying the metal ions M3in a solution containing ions of the metal M2while applying the ultrasonic wave to make the porous substrate carry a colloid of the metal M2; immersing the porous substrate carrying the colloid of the metal ions M2into pure water or a diluted acid solution; and immersing the porous substrate carrying the colloid of the metal M2in the solution which contains the ions of the metal M1, a reducing agent and a smoothing agent of 50 ppm or less to electroless-plate the porous substrate with the metal M2.

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