Aerogel-filled metals: a syntactic cellular material

Orth, Andreas; Steinbach, Sonja; Dennstedt, Anne; Ratke, Lorenz

doi:10.1080/02670836.2016.1195971

Cited by 8 publications

(3 citation statements)

References 25 publications

(40 reference statements)

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“…Further studies were performed which included a variation of the density and synthesis parameters of the materials. − The latest research from Wong et al provided a comprehensive investigation of compressive behavior regarding the density, especially at high strains . Furthermore, silica composites were formed by incorporating fibers, − cross-linking agents, or filling materials to improve the mechanical properties. Generally, silica is attractive to apply, attributable to well-understood and manifold approaches and a long history .…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Metal Oxide Aerogels

et al. 2017

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In this study we report on mechanical properties of molded, single component Al 2 O 3 , Ga 2 O 3 , Fe 2 O 3 , and ZrO 2 as well as mixed aerogels, made from yttrium stabilized zirconia, yttrium aluminum garnet, and zinc aluminum spinel. Initially all aerogels were produced equally in molded bodies by a facile epoxy method and were annealed afterward at 300 °C. Then we performed uniaxial pressure tests on cylindrical aerogel monoliths to gain Young's modulus which depends on composition, density, and posttreatment. Already pure aerogels like ZrO 2 show wellpromising Young's modulus of 10.7 MPa, whereas most popular SiO 2 materials display a modulus between 2 and 3 MPa at comparable densities. Moreover we focused on Al 2 O 3 aerogels which exhibit high stability and interesting densification behavior depending on the annealing temperature. On the basis of this observation, we combined the toughness of the Al 2 O 3 scaffold with the extraordinary hardness of ZrO 2 , by adding up to 20 atom % Zr, to increase the specific Young's modulus. For the mixed material with a Zr content of 20 atom %, we reach a record value for compressible aerogels of 125 MPa mL g −1 .

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Metal Oxide Aerogels

et al. 2017

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“…In a number of studies, a variety of lightweight aggregates or hollow particles, such as cenospheres, hollow spheres [ 8 ], ceramic spheres [ 5 ], and hollow metallic spheres, have been used as filler particles. Different methods have also been used to produce MSF, such as stir casting [ 9 ], squeeze casting [ 10 ] and powder metallurgy [ 11 ]. Pressure infiltration is another widely-used process owing to its competitive cost and the high filler particle volume fraction achievable [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Controlled Shrinkage of Expanded Glass Particles in Metal Syntactic Foams

et al. 2017

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Metal matrix syntactic foams have been fabricated via counter-gravity infiltration of a packed bed of recycled expanded glass particles (EG) with A356 aluminum alloy. Particle shrinkage was studied and has been utilized to increase the particles' strength and tailor the mechanical properties of the expanded glass/metal syntactic foam (EG-MSF). The crushing strength of particles could be doubled by shrinking them for 20 min at 700 • C. Owing to the low density of EG (0.20-0.26 g/cm 3 ), the resulting foam exhibits a low density (1.03-1.19 g/cm 3 ) that increases slightly due to particle shrinkage. Chemical and physical analyses of EG particles and the resulting foams were conducted. Furthermore, metal syntactic foam samples were tested in uni-axial compression tests. The stress-strain curves obtained exhibit three distinct regions: elastic deformation followed by a stress plateau and densification commencing at 70-80% macroscopic strain. Particle shrinkage increased the mechanical strength of the foam samples and their average plateau stress increased from 15.5 MPa to 26.7 MPa.

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“…At present, the SA granules or powder are usually used as fillers directly or combined with other substances to meet some requirements in the practical applications (Kanakarajan et al, 2015;Mazrouei-Sebdani et al, 2015;Orth et al, 2017;Sathish Kumar et al, 2017;Maghsoudi and Motahari, 2018;Sedighi et al, 2022). For example, the aerogel-filled insulating brick (aero-brick) (Wernery et al, 2017) and the aerogel incorporated concrete (Gao et al, 2014;Ng et al, 2015;Julio et al, 2016;Schnellenbach-Held et al, 2016;Zeng et al, 2018) both adopt SA granules or powder as the raw materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of mechanical grinding on the physicochemical properties of silica aerogels

Li,

Zeng,

Shen

et al. 2023

Front. Mater.

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Mechanical grinding is a facile method to get silica aerogels (SAs) with various particle sizes. However, the relationship between the grinding parameters and physicochemical properties is still unclear. In this study, we concentrated on the effects of grinding time and grinding speed on the physical and chemical properties of silica aerogels. The results reveal that the physicochemical properties of silica aerogels are more sensitive to the grinding speed rather than the grinding time. When the grinding speed is over 200 rpm, large particles of silica aerogels are crushed into smaller particles with obviously decreasing particle sizes and the silica skeletons of silica aerogels have collapsed. The reduction of particle sizes and the collapse of skeleton lead to an increase in both the tap density and thermal conductivity. Therein, the thermal conductivity is positively proportional to the density. Furthermore, the grinded silica aerogels powders still possess the contact angles over 135°, indicating the good hydrophobicity. All these demonstrate that the mechanical grinding has evident effects on the microstructure, density, thermal conductivity and particle sizes, which further impact the performance of silica aerogels during the practical applications. Given the expanding applications of SAs across various industries, the study serves as a valuable reference for optimizing the mechanical post-treatment of SAs, facilitating the achievement of desired particle sizes. Ultimately, this research holds great potential in diversifying the application fields of SAs in their powdered form.

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Aerogel-filled metals: a syntactic cellular material

Cited by 8 publications

References 25 publications

Mechanical Properties of Metal Oxide Aerogels

Mechanical Properties of Metal Oxide Aerogels

Controlled Shrinkage of Expanded Glass Particles in Metal Syntactic Foams

Effects of mechanical grinding on the physicochemical properties of silica aerogels

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