Vibration-Assisted Sputter Coating of Cenospheres: A New Approach for Realizing Cu-Based Metal Matrix Syntactic Foams

Shishkin, Andrei; Drozdova, Maria; Kozlov, V. G.; Hussainova, Irina; Lehmhus, Dirk

doi:10.3390/met7010016

Cited by 38 publications

(26 citation statements)

References 24 publications

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“…Liepa clay also contained several distinctive components such as iron oxide (Fe 2 O 3 —6.88 ± 0.2 wt %), while other elements like Na, K, Ca, Mg, Ti (in the form of oxides) did not exceed 8 wt % in total [ 18 ]. As reported in [ 24 , 25 ], the phase composition of Liepa clay changes under thermal treatment. The initial illite phase becomes less pronounced at 950 °C and disappears at higher firing temperatures (up to 1200 °C).…”

Section: Methodsmentioning

confidence: 62%

Effect of Fly-Ash Cenospheres on Properties of Clay-Ceramic Syntactic Foams

et al. 2017

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A low-density clay ceramic syntactic foam (CSF) composite material was successfully synthesized from illitic clay added by fly ash cenospheres (CS) using the semi-dry formation method. The content of CS varied in the range of 10, 30, 50 and 60 vol %. Furthermore, reference samples without cenospheres were produced for property comparison. The materials comprising different amount of the additives were fired at temperatures of 600, 950, 1000, 1050, 1100, 1150 and 1200 °C. Firing times were kept constant at 30 min. Processing characteristics of the materials were evaluated in terms of density achieved and shrinkage observed as functions of both the CS content and the sintering temperature. The compressive strength and water uptake were determined as application-oriented properties. Except for the reference and the low CS level samples, the materials show an increase in strength with the increase in firing temperature, and a decrease of mechanical reliability with a decrease in density, which is typical for porous materials. Exceptions are the samples with no or low (10 vol %) content of cenospheres. In this case, the maximum strength is obtained at an intermediate sintering temperature of 1100 °C. At a low density (1.10 and 1.25 g/cm3), the highest levels of strength are obtained after sintering at 1200 °C. For nominal porosity levels of 50 and 60 vol %, 41 and 26 MPa peak stresses, respectively, are recorded under compressive load.

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Section: Methodsmentioning

confidence: 62%

Effect of Fly-Ash Cenospheres on Properties of Clay-Ceramic Syntactic Foams

et al. 2017

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“…Their typical constituents include alumino‐silicates, silicon dioxide, and alumina. Exemplary compositions have, e.g., been published by Shishkin et al, while Peroni et al give 27–33 wt% Al 2 O 3 , 55–65 wt% SiO 2 , and a balance of up to 6 wt% Fe 2 O 3 for Omya materials as used in this study …”

Section: Methodsmentioning

confidence: 94%

New Core Technology for Light Metal Casting

et al. 2018

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A new concept for lost cores for gravity castings is presented. In contrast to the conventional principle of thermally breaking down binder strength, demolding of the new cores is based on a mechanical collapse of parts of the filler material. For this purpose, the usual sand filler is substituted for hollow microspheres with defined isostatic compression strength. After casting, the core is subjected to high hydrostatic pressure, leading to destruction of the hollow filler and a resulting loss of core structural strength and volume, allowing it to be washed out easily. In the present study, phosphate-, gypsum-, and cement-bonded cores with additions of hollow glass microspheres and cenospheres are produced and their bending strength and surface quality are determined. The core behavior during the casting process is evaluated using permanent mold gravity and low pressure aluminum casting experiments. Phosphate bonded materials containing 62 vol% of glass microspheres exhibit the best combination of surface quality and collapse behavior while reaching strength levels comparable to conventional sand cores. The study contributes to a deeper understanding of the collapse mechanisms, suggesting a major role of 1) open porosity of the matrix phase, 2) sufficient strength of the filler-matrix interface, and 3) filler particle shell integrity. Due to a lack of the latter, cenospheres are proved unsuitable for the new demolding approach.

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“…Structures of the latter kind have, for example, been discussed by Fiedler et al [ 100 ]. A more recent approach uses spark plasma sintering (SPS) to join cenospheres sputter-coated with metallic materials like copper [ 101 ].…”

Section: Categorization Of Foams and Associated Manufacturing Procmentioning

confidence: 99%

From Stochastic Foam to Designed Structure: Balancing Cost and Performance of Cellular Metals

et al. 2017

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Over the past two decades, a large number of metallic foams have been developed. In recent years research on this multi-functional material class has further intensified. However, despite their unique properties only a limited number of large-scale applications have emerged. One important reason for this sluggish uptake is their high cost. Many cellular metals require expensive raw materials, complex manufacturing procedures, or a combination thereof. Some attempts have been made to decrease costs by introducing novel foams based on cheaper components and new manufacturing procedures. However, this has often yielded materials with unreliable properties that inhibit utilization of their full potential. The resulting balance between cost and performance of cellular metals is probed in this editorial, which attempts to consider cost not in absolute figures, but in relation to performance. To approach such a distinction, an alternative classification of cellular metals is suggested which centers on structural aspects and the effort of realizing them. The range thus covered extends from fully stochastic foams to cellular structures designed-to-purpose.

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Vibration-Assisted Sputter Coating of Cenospheres: A New Approach for Realizing Cu-Based Metal Matrix Syntactic Foams

Cited by 38 publications

References 24 publications

Effect of Fly-Ash Cenospheres on Properties of Clay-Ceramic Syntactic Foams

Effect of Fly-Ash Cenospheres on Properties of Clay-Ceramic Syntactic Foams

New Core Technology for Light Metal Casting

From Stochastic Foam to Designed Structure: Balancing Cost and Performance of Cellular Metals

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