Processing, Properties and Coating of Micro‐Porous Syntactic Foams

Weise, Jörg; Zanetti-Bueckmann, Vitor; Yezerska, Olga; Schneider, Michael; Haesche, Marco

doi:10.1002/adem.200600198

Cited by 22 publications

(18 citation statements)

References 3 publications

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“…Nevertheless, even higher‐melting alloys like FeNi36 and FeNi50, which necessitate sintering at 1000°C, can be processed showing only slight deformation of the glass microspheres. Their somewhat surprising resilience under such adverse conditions is explained by assuming that early initiation of sintering among metal powder particles provides a scaffold which stabilizes the system …”

Section: Introductionmentioning

confidence: 82%

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Production and Properties of 316L Stainless Steel Cellular Materials and Syntactic Foams

Weise

Lehmhus

Baumeister

et al. 2013

steel research int.

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Section: Introductionmentioning

confidence: 82%

“…Of these, aluminum and zinc matrix syntactic foams are common and usually produced by melt infiltration of sintered glass or ceramic microsphere preforms . Further work has been done on magnesium matrix syntactic foams, again following a melt‐based route . More challenging are higher melting alloys like Ti, Fe, or Fe alloys like steels.…”

Section: Introductionmentioning

confidence: 99%

Production and Properties of 316L Stainless Steel Cellular Materials and Syntactic Foams

Weise

Lehmhus

Baumeister

et al. 2013

steel research int.

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“…have been realized, featuring both polymer4, 5 and metal6 matrices. In the case of metals, reinforcing particles can be millimeter sized steel hollow spheres,7 or, on another, micrometer length scale, cenospheres8 as well as glass microspheres 9. The present study concentrates on the latter variant.…”

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confidence: 99%

Syntactic Iron Foams – On Deformation Mechanisms and Strain‐Rate Dependence of Compressive Properties

et al. 2012

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Using hollow particles as reinforcement, syntactic foams are a unique class of materials with features of conventional foams as well as composites. Usually, the main role of the filler is to introduce porosity, and thus also change specifically the compressive response to that of a typical foam or cellular material. However, depending on which of the many variants of such syntactic foams is considered, hollow particles can also have a strengthening effect. In the way this is achieved, however, they are distinguished from the many kinds of metal foams that use ceramic particles first for stabilization during processing and secondly for some strengthening effect: [1][2][3] In syntactic foams, the reinforcement provides a stable inner lining of each pore, while in conventional particle-reinforced metal foams, the distribution of ceramic particles in the matrix effectively allows them to be understood as cellular MMCs in which matrix ductility is adversely affected by the otherwise strengthening addition. In syntactic foams of the type discussed here, the matrix is unaltered and can thus maintain considerable levels of ductility.So far, numerous materials differing in the size of structural elements, nature of filler, etc. have been realized, featuring both polymer [4,5] and metal [6] matrices. In the case of metals, reinforcing particles can be millimeter sized steel hollow spheres, [7] or, on another, micrometer length scale, cenospheres [8] as well as glass microspheres. [9] The present study concentrates on the latter variant. Main production methods for such materials are melt stirring, melt infiltration [9][10][11][12] or powder metallurgy processes. [13,14] When contrasted to metal foams based on the powder compact melting or the APM process [15][16][17] iron matrix syntactic foams combine lower maximum porosity and thus higher density with greatly improved performance under both quasi-static compressive and tensile load while showing the typical deformation characteristics of foams. [14] In comparison to other types of iron-based foams, such as the so-called lotus-type porous metals recently discussed in detail by Song et al. and Tane et al.,[18][19][20] the present materials combine still higher strength with isotropic behavior and greater ease in manufacture of theSyntactic iron foams are produced by metal injection moulding from pure Fe powder and two grades of commercial glass microspheres. Mechanical performance of samples containing 5/10/13 wt% of microspheres is compared to unfilled reference material properties at strain-rates covering 6 orders of magnitude, including Split Hopkinson Pressure Bar (SHPB) experiments. Complex mechanical behavior including strengthening effects of microspheres leading to a plateau strength level which is nearly independent of porosity as well as strain-rate sensitivity of compressive properties are observed. Typical plateau onset stress levels exceed equivalent characteristics of most comparable cellular metallic materials, reaching between approximately 220 and 270 MPa...

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“…As presented in [8] this approach allows to produce syntactic foams with comparatively low densities of 1.1 -1.4 g/cm 3 for aluminium alloy matrices and 2.0 -4.0 g/cm 3 for zinc alloy matrices. The foams are pressure-tight (tested up to 800 bar) and can be coated e.g.…”

Section: Introductionmentioning

confidence: 99%

Production and properties of micro‐porous glas bubble zinc and aluminium composites

Weise¹,

Yezerska

Busse

et al. 2007

Materialwissenschaft Werkst

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Mikroporöse syntaktische Schäume wurden durch Integration von Glashohlkugeln in Aluminium- und Zink-Matrizes hergestellt. Die Fertigung der Verbundwerkstoffe erfolgte durch Druckinfiltration von Preformen im Squeezcasting mit den Legierungen AlSi9Cu3 und ZnA14Cu. Die Preformen wurden binderfrei in Schüttungen mit verschiedenen Verdichtungen gesintert. Durch Einsatz von Platzhaltern und Kombination verschiedener Sinterschritte konnten Schaum-Komponenten mit lokal unterschiedlichen Porositäten hergestellt werden. Die mechanischen und thermischen Eigenschaften der Materialien wurden getestet. Die mikroporösen syntaktischen Schäume weisen eine sehr hohe Festigkeit und ein gutes Energieabsorptionsvermögen unter Drackbelastung auf. Weiterhin wurden das Korrosionsverhalten sowie das Verhalten bei höheren Temperaturen untersucht

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Processing, Properties and Coating of Micro‐Porous Syntactic Foams

Cited by 22 publications

References 3 publications

Production and Properties of 316L Stainless Steel Cellular Materials and Syntactic Foams

Production and Properties of 316L Stainless Steel Cellular Materials and Syntactic Foams

Syntactic Iron Foams – On Deformation Mechanisms and Strain‐Rate Dependence of Compressive Properties

Production and properties of micro‐porous glas bubble zinc and aluminium composites

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