Control of pore size by metallic fibres in glass matrix composite foams produced by microwave heating

Minay, E. J.; Veronesi, Paolo; Cannillo, Valeria; Leonelli, Cristina; Boccaccini, A. R.

doi:10.1016/j.jeurceramsoc.2003.11.015

Cited by 22 publications

(13 citation statements)

References 17 publications

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“…Most metals generally have a skin depth of the micrometer order, so the direct heating tends to remain superficial, but using powders with particle size of the skin depth order, it is possible to heat them directly and use microwave in the sintering process. However, the direct heating itself is not capable of explaining the high heating rates and enhanced densification reported in literature, and concurrent phenomena, like arcing and plasma formation are thought to occur (Minay et al, 2004;Roy and Agrawal, 2007).…”

Section: Microwave-green Parts Interactionmentioning

confidence: 90%

Microwave assisted sintering of green metal parts

Leonelli

Veronesi

Denti

et al. 2008

Journal of Materials Processing Technology

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171

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Section: Microwave-green Parts Interactionmentioning

confidence: 90%

Microwave assisted sintering of green metal parts

Leonelli

Veronesi

Denti

et al. 2008

Journal of Materials Processing Technology

Self Cite

171

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“…Moreover, previous studies demonstrated that the presence of small conductive particles in a dielectric matrix leads to the electric field concentration in the space between the particles, 19 resulting in enhanced neck formation during sintering, 20 or the localized overheating of the dielectric matrix itself 21 . Moreover, when the electric field concentration becomes high enough, breakdown phenomena (plasma formation and arcing) are generated depending on the dielectric strength of the medium interposed between the conductive particles, and this phenomena can trigger more efficient mass transport mechanisms during sintering 22 …”

Section: Resultsmentioning

confidence: 99%

Forming Silver Conductive Thick Films by Microwave Heating

Hwang

Veronesi

Leonelli

et al. 2010

Journal of the American Ceramic Society

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This study investigated a microwave‐assisted processing route for the synthesis of conductive thick films on dielectric substrates starting from silver (Ag) and a glass frit powder mixture paste. A single mode microwave (2.45 GHz) applicator was used to reduce the processing time and improve the energy efficiency compared with conventional heating. The microstructures of the Ag‐based conductive thick films that were fired using conventional and microwave heating were observed. After 300 s of microwave treatment, the shrinkage of the microwave‐fired Ag conductive thick films was similar to the conventionally processed films at 580°C for 30 min. The results suggested that the drastic reduction of the substrate temperature and the rapid processing time were significant advantages because both helped to minimize the Ag diffusion into the glass, thus reducing the unwanted yellowing phenomena.

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“…TiO 2 ) and fibres . The foaming may be related to the nature of the reinforcement, operating with metal fibres (Hastelloy X fibres) mixed with borosilicate glass, under microwave radiation. The fibres tips act as ‘nucleating agents’ for pores, since the higher local electric field strength in their vicinity, connected with their pronounced radius of curvature, enhances the power dissipation in the surrounding glass matrix, which overheats, releasing gasses.…”

Section: Overview Of Glass‐based Productsmentioning

confidence: 99%

Recycling of inorganic waste in monolithic and cellular glass‐based materials for structural and functional applications

Rincón

Marangoni

Çetin

et al. 2016

J of Chemical Tech & Biotech

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The stabilization of inorganic waste of various nature and origin, in glasses, has been a key strategy for environmental protection for the last decades. When properly formulated, glasses may retain many inorganic contaminants permanently, but it must be acknowledged that some criticism remains, mainly concerning costs and energy use. As a consequence, the sustainability of vitrification largely relies on the conversion of waste glasses into new, usable and marketable glass‐based materials, in the form of monolithic and cellular glass‐ceramics. The effective conversion in turn depends on the simultaneous control of both starting materials and manufacturing processes. While silica‐rich waste favours the obtainment of glass, iron‐rich wastes affect the functionalities, influencing the porosity in cellular glass‐based materials as well as catalytic, magnetic, optical and electrical properties. Engineered formulations may lead to important reductions of processing times and temperatures, in the transformation of waste‐derived glasses into glass‐ceramics, or even bring interesting shortcuts. Direct sintering of wastes, combined with recycled glasses, as an example, has been proven as a valid low‐cost alternative for glass‐ceramic manufacturing, for wastes with limited hazardousness. The present paper is aimed at providing an up‐to‐date overview of the correlation between formulations, manufacturing technologies and properties of most recent waste‐derived, glass‐based materials. © 2016 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Control of pore size by metallic fibres in glass matrix composite foams produced by microwave heating

Cited by 22 publications

References 17 publications

Microwave assisted sintering of green metal parts

Microwave assisted sintering of green metal parts

Forming Silver Conductive Thick Films by Microwave Heating

Recycling of inorganic waste in monolithic and cellular glass‐based materials for structural and functional applications

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