Lightweight, hollow-sphere-composite (HSC) materials for mechanical engineering applications

Baumeister, Erika; Klaeger, Siegfried; Kaldos, A.

doi:10.1016/j.jmatprotec.2004.04.385

Cited by 25 publications

(12 citation statements)

References 6 publications

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“…Another approach for light weight cellular structures applies hollow sphere composites (HSCs) [26,29,31,125,188,280]. HSCs consist of small hollow spheres (filled with air, gas or metal powder) with a volume fraction of up to 80% and a reactive resin system.…”

Section: Metal Foams Porous and Cellular Materialsmentioning

confidence: 99%

“…Also different types of hollow spheres (10-2000 mm diameter, wall thickness of 10% of diameter) in combination with cold and warm curing epoxy resin with and without fiber reinforcement were investigated. For a comparison of mechanical properties of HSC with steel, glass fiber reinforced composite (GFRP) and carbon fiber reinforced composite (CFRP) the ratio of stiffness (Young's modulus) to density is useful [29]. HSC materials showed a higher ratio than either steel or GFRP (Table 5).…”

Section: Metal Foams Porous and Cellular Materialsmentioning

confidence: 99%

“…Hollow sphere composite (HSC); (a) corundum, (b) interior of Fillite, (c) borosilicate, (d) Fillite and corundum[29,30].…”

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Materials in machine tool structures

et al. 2015

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Section: Metal Foams Porous and Cellular Materialsmentioning

confidence: 99%

Section: Metal Foams Porous and Cellular Materialsmentioning

confidence: 99%

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Materials in machine tool structures

et al. 2015

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“…Due to their potential application in many industrial fields, it has received much interest by researches [1][2][3][4][5]. It is generally understood that the physical and chemical properties of hollow spherical materials are strongly dependent on their shape and structural characteristics.…”

Section: Introductionmentioning

confidence: 99%

A Facile Preparation Method of ZrO₂Hollow Sphere Using PVA Microcapsule as a Template

Lee

Ryu

et al. 2016

MATEC Web Conf.

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Abstract. In this study, we proposed a simple and facile preparation method of ZrO 2 hollow sphere using PVA microcapsule as a template. The prepared hollow sphere was characterized by XRD, FESEM, N 2 adsorption/desorption isotherms, FT-IR techniques. PVA microcapsule were prepared by polymerization in a water-in-oil emulsion and coated by adding of zirconia sol. Uniform and spherical shaped zirconia hollow sphere with very narrow size distribution was obtained after calcination at 700 °C by removing the PVA microcapsule template. No other carbon residues and carbon-zirconium compounds were observed. These results indicate that the zirconia capsule formed without deformation of the zirconia shell structure, and CO 2 and H 2 O gases by decomposition of the PVA microcapsule during sintering process removed through the zirconia shell.

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“…Baumeister and colleagues [12] investigated the linear thermal expansion coefficient of corundum based hollow sphere composites (HSC) using thermomechanical analysis. They found that the thermal behaviour of HSC is mainly governed by the epoxy resin.…”

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Recent Advances in the Prediction of the Thermal Properties of Syntactic Metallic Hollow Sphere Structures

et al. 2008

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Metallic hollow sphere structures (MHSS) are a new group of cellular metals characterised by easily reproducible geometry and therefore consistent mechanical and physical properties. [1] Well-known advantages of cellular metals are their excellent ability for energy adsorption, [2,3] good damping behaviour, [4,5] sound absorption, [6] excellent heat insulation [7,8] and a high specific stiffness. [9,10] The combination of these properties opens a wide field of potential multi-functional applications.The high thermal insulation capability of hollow sphere structure has been addressed in a US Patent [11] by Schneider and coworkers. Baumeister and colleagues [12] investigated the linear thermal expansion coefficient of corundum based hollow sphere composites (HSC) using thermomechanical analysis. They found that the thermal behaviour of HSC is mainly governed by the epoxy resin. Lu and Kou [13] conducted a comprehensive numerical and experimental study based on unit cells of homogeneous hollow sphere structures. However, only automatically generated finite element meshes were used. This approach does not allow the consideration of different material combinations.A new powder metallurgy based manufacturing process enables the production of metallic hollow spheres of defined geometry. [14] This technology brings a significant reduction in costs in comparison to earlier applied galvanic methods and all materials suitable for sintering can be applied. EPS (expanded polystyrene spheres) are coated with a metal powder -binder suspension by turbulence coating. The green spheres produced can either be sintered separately to manufacture single hollow spheres (cf. Fig. 2)or be pre-compacted and sintered in bulk thus creating sintering necks between adjacent spheres. [15] Depending on the parameters of the sintering process, the micro-porosity of the sintered cell wall can be adjusted. In a subsequent de-bindering process, the EPS spheres are pyrolised. The increase of the carbon content of the sintered metal by the diffusion of the incinerated binder and polymer causes degradation of mechanical properties and corrosion resistance. Special reducing processes are required to reduce this effect. [16] Various joining technologies such as sintering, soldering and adhering can be used to assemble the single hollow spheres to interdependent structures. [17,18] Adhering is the most economic way of joining and therefore is attractive for a wide range of potential applications. Another important advantage is the possible utilisation of the physical behaviour and morphology of the adhesive layer as a further design parameter for the optimisation of the structure's properties for specific applications. Finite Element MethodThe numerical investigation of MHSS presumes the knowledge of its geometric dimensions. Therefore, measurements on experimental samples (cf. Fig. 1 a)) are performed. The averaged value of the outer sphere diameter R is 1.5 mm, the minimum distance a min between two neighbouring spheres is between 0.12 and 0.24 mm and ...

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Lightweight, hollow-sphere-composite (HSC) materials for mechanical engineering applications

Cited by 25 publications

References 6 publications

Materials in machine tool structures

Materials in machine tool structures

A Facile Preparation Method of ZrO₂Hollow Sphere Using PVA Microcapsule as a Template

Recent Advances in the Prediction of the Thermal Properties of Syntactic Metallic Hollow Sphere Structures

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Lightweight, hollow-sphere-composite (HSC) materials for mechanical engineering applications

Cited by 25 publications

References 6 publications

Materials in machine tool structures

Materials in machine tool structures

A Facile Preparation Method of ZrO2Hollow Sphere Using PVA Microcapsule as a Template

Recent Advances in the Prediction of the Thermal Properties of Syntactic Metallic Hollow Sphere Structures

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Product

Resources

About

A Facile Preparation Method of ZrO₂Hollow Sphere Using PVA Microcapsule as a Template