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Lecture

WEB Mechanical characterization of an interpenetrating metal-matrix-composite based on highly homogeneous ceramic foams

Tuesday (28.04.2020)
11:40 - 12:00 Room 1

Light-weight materials for structural application with thermal load play a key role in nowadays engineering success regarding to reduction of greenhouse gases and environmentally compatible implementations in mobility and transportation.

By combining light-weight metals with ceramics, improved mechanical properties, as well as wear resistance of the composite can be achieved and the reached limits of light weight metals can be outperformed. Such metal-matrix-composites (MMC) were usually produced using reinforcing ceramic particles or fibers. Industrial application like e.g. piston rings, brakes, engine blocks, connecting rods and propeller shafts show the high potential of this material group.

Using an interpenetrating phase composite (IPC) instead of particles, fibers or similar discontinuous reinforcements, higher strength, stiffness and hardness, as well as wear resistance and reduced thermal expansion coefficients can be reached. This is due to the hybrid microstructure of IPCs with both phases building up a complex 3D structure with two continuous constituents. For interpenetrating MMCs, often effort is taken to design a thermally stable light-weight composite up to 450 °C, as required for combustion engines e.g. By high production costs - mainly of the ceramic preform - these IPCs are not economically for a broad field of application yet, despite their promising mechanical properties.

By using a novel production technique, a macroscopically high homogeneous and low-cost ceramic preform can be fabricated via a patented manufacturing process by Morgan Advanced Materials Haldenwanger GmbH. The homogeneity of the preform promises reproducible and representative properties for small geometries of less than a cubic centimeter already, while the low production costs warrant to facilitate the transfer of bench-scale to industrial application.

An innovative MMC is produced via gas-pressure infiltration with a cast aluminum alloy (AlSi10Mg) and the ceramic preform. Compression tests with in-situ -methods, microstructural investigations with SEM and X-ray computed tomography are used to investigate the material and get an understanding of the application potential and limits of it.

The results of the characterization of the introduced novel interpenetrating MMC, with a focus on mechanical properties, is presented in this contribution and compared to other state-of-the-art interpenetrating MMCs based on conventional preforms.

Speaker:
Joél Schukraft
University of Augsburg
Additional Authors:
  • Dr.-Ing. Christoph Lohr
    University of Augsburg
  • Prof. Dr. Kay André Weidenmann
    Universität Augsburg