Nano-Porous Metal Foam via Electroless Plating
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Solution Overview
Problem
Current methods for manufacturing open cell metal foams with nano-sized pores are complex and result in reduced structural strength due to the use of polyurethane foams, which evaporate at high temperatures, and existing technologies are limited to microporous-scale nickel plating on carbon foams.
Innovation Solution
A method involving the creation of a porous polymer foam with nano-sized pores, followed by electroless plating with nickel or copper, and subsequent high-temperature heat-treatment to remove the polymer foam, maximizing the surface area and structural integrity of the metal foam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If physical vapor deposition is used to form metal layers on polyurethane foam, then nanoscale open porous structure can be achieved, but the process becomes complex and thick porous foam cannot be manufactured uniformly
Solution Approach 1:
The invention extracts the metal coating step from the complex physical vapor deposition process and replaces it with electroless plating, which can be applied uniformly throughout thick foam structures without requiring sophisticated vacuum deposition equipment
Solution Approach 2:
The invention changes the deposition method from physical vapor deposition to electroless plating, fundamentally altering the process parameters and mechanism to achieve uniform coating in thick foam structures while maintaining nanoscale porosity
2Shape
If polyurethane foam is used as the frame material, then open cell structure can be formed, but structural strength is reduced due to evaporation at high temperatures
Solution Approach 1:
The invention changes the foam material from polyurethane to carbon foam, fundamentally altering the thermal properties to withstand high-temperature processing while maintaining the open cell structure
Solution Approach 2:
The invention uses carbon foam as a stable substrate that can be combined with metal coatings through electroless plating, creating a composite structure that maintains both open cell morphology and high structural strength
3Strength
If nickel or copper plating is formed on carbon foam, then structural strength is improved, but only microporous-scale level can be achieved, not nano-scale
Solution Approach 1:
The invention performs preliminary formation of nanoscale pores in the carbon foam structure before applying the metal coating through electroless plating, ensuring that the nanoscale porosity is established prior to strengthening with metal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the production of metal foams with maximized surface area and enhanced structural strength by forming a regularly distributed nano-patterned structure, overcoming the limitations of previous techniques.
Implementation Method 1
pre-processing the polymer foam to improve surface wettability of the polymer foam
Implementation Method 2
improve surface wettability of the polymer foam
Implementation Method 3
coating a metal on the porous polymer foam through electroless plating
Implementation Method 4
removing the porous polymer foam by high-temperature heat-treatment after the electroless plating step
Implementation Method 5
irradiating ultraviolet (UV) light to the material of the step (e) to form a polymer foam containing nano-sized pores through diffraction and interference of the UV light
Implementation Method 6
form a polymer foam containing nano-sized pores through diffraction and interference of the UV light
Implementation Method 7
form a polymer foam containing nano-sized pores through diffraction and interference of the UV light
Data Source
AI summary
A method of manufacturing a porous metal foam having pores of nano size includes: manufacturing a porous polymer foam containing pores of nano size; and coating metal on the porous polymer foam through electroless plating. The present invention provides porous metal foams which contains nano-sized pores and hence, their specific surface area is maximized owing to the regularly-patterned nanoporous structure formed inside.