Affiliation:
1. Protective Systems Helmut Schmidt University/University of the Federal Armed Forces Hamburg Am Stadtrand 50 22047 Hamburg Germany
2. Material Science and Engineering Saarland University Campus D2.3 66123 Saarbrücken Germany
3. Inorganic Solid State Chemistry Saarland University Campus C4.3 66123 Saarbrücken Germany
4. Experimental Physics Saarland University Campus D2.2 66123 Saarbrücken Germany
Abstract
Metal foams are characterized by low weight, high resource efficiency, high relative stiffness, and exceptional energy absorption capacity under compressive load. Nickel/polyurethane (Ni/PU) hybrid foams consist of an open‐cell polyurethane foam coated with a layer of nickel produced by electrochemical deposition. The coating of the PU foams takes place in a flow reactor, in which the electrolyte is pumped through the foam at a defined flow velocity. The macromechanical properties of foam‐like structures depend on the structure of the skeleton, the inherent material properties and, in the case of Ni/PU hybrid foams, the properties of the electrochemically generated nickel layer. To influence their mechanical properties, the Ni/PU hybrid foams are subjected to heat treatment. In the given experimental setup, the parameters flow velocity, temperature, and duration of the heat treatment are each investigated at two different levels. Thus, interactions between the initial microstructure and the type of heat treatment are evaluated by means of X‐ray diffraction (XRD) and electron backscatter diffraction (EBSD) measurements. Interactions between initial mechanical properties and heat treatment are investigated by uniaxial compression tests and superimposed compression‐torsion tests. The knowledge gained is used to control the macromechanical properties of the hybrid foam.
Funder
Deutsche Forschungsgemeinschaft