Viscous‐Phase Silicate Processing

Müller, Ralf; Reinsch, Stefan

doi:10.1002/9781118176665.ch3

Cited by 19 publications

(27 citation statements)

References 195 publications

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“…On the other hand, sintering is controlled by the effective viscosity of powder compacts. Hence, dispersed rigid particles can also decrease the shrinkage rate (Müller et al, 2007;Müller and Reinsch, 2012) and therefore provide more complete surface desorption. In a similar sense, glasses with a less temperature-dependent viscosity, causing a broader temperature range of sintering, should be less prone to foaming.…”

Section: Foaming Mitigation Strategiesmentioning

confidence: 99%

Sintering and Foaming of Barium Silicate Glass Powder Compacts

2016

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The manufacture of sintered glasses and glass-ceramics, glass matrix composites, and glass-bounded ceramics or pastes is often affected by gas bubble formation. Against this background, we studied sintering and foaming of barium silicate glass powders used as SOFC sealants using different powder milling procedures. Sintering was measured by means of heating microscopy backed up by XPD, differential thermal analysis, vacuum hot extraction (VHE), and optical and electron microscopy. Foaming increased significantly as milling progressed. For moderately milled glass powders, subsequent storage in air could also promote foaming. Although the powder compacts were uniaxially pressed and sintered in air, the milling atmosphere significantly affected foaming. The strength of this effect increased in the order Ar ≈ N2 < air < CO2. Conformingly, VHE studies revealed that the pores of foamed samples predominantly encapsulated CO2, even for powders milled in Ar and N2. Results of this study thus indicate that foaming is caused by carbonaceous species trapped on the glass powder surface. Foaming could be substantially reduced by milling in water and 10 wt% HCl.

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Section: Foaming Mitigation Strategiesmentioning

confidence: 99%

Sintering and Foaming of Barium Silicate Glass Powder Compacts

2016

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“…8) exhibits new lattice structures that formed during sintering inside a neck area. This means when such crystalline areas grow and meet together, viscous flow is restrained as well [13].…”

Section: Sintering Methodsmentioning

confidence: 99%

Sintering and piezoelectric properties of K0.5Na0.5NbO3 glass microspheres

Hmood

Guenster

Heinrich

2015

Journal of the European Ceramic Society

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“…The last decades saw development of the downstream thermal treatment of formed glass parts (called "ceramming") for a large variety of chemical systems, while nowadays, sintering of glass powders is available as a powerful route for glass-ceramic processing at lower fabrication temperatures and for complex shapes using powder compacts or slurry deposits on various substrates prepared by dipping, brushing, or spraying techniques or the emerging printing technologies (Höland and Beall, 2012;Müller and Reinsch, 2012). For both fabrication routes, crystal growth at or close to internal and external interfaces induced by heterogeneous nucleation is the key process transforming glass into glass-ceramic.…”

Section: Nucleation and Crystallization Of Glasses And Glass-ceramicsmentioning

confidence: 99%

“…Extraordinary and, therefore, to be distinguished is the work of the glass-ceramic inventor S. Donald Stookey (Beall) to whom this Research Topic is dedicated. He had realized, as early as at the mid of the last century, that glass-ceramic properties are mainly influenced by the controlling of the mechanisms of nucleation and crystal growth to achieve desired microstructures in the volume of these materials.The last decades saw development of the downstream thermal treatment of formed glass parts (called "ceramming") for a large variety of chemical systems, while nowadays, sintering of glass powders is available as a powerful route for glass-ceramic processing at lower fabrication temperatures and for complex shapes using powder compacts or slurry deposits on various substrates prepared by dipping, brushing, or spraying techniques or the emerging printing technologies (Höland and Beall, 2012;Müller and Reinsch, 2012). For both fabrication routes, crystal growth at or close to internal and external interfaces induced by heterogeneous nucleation is the key process transforming glass into glass-ceramic.…”

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confidence: 99%

Editorial: Nucleation and Crystallization of Glasses and Glass-Ceramics

Deubener¹,

Höland²

2017

Front. Mater.

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Glass-ceramic technology, which is based on materials built from glasses via controlled nucleation and crystal growth, is promising to provide us with materials of high strength, high toughness, unique electrical/electronic or magnetic properties, exceptional optical or unusual thermal or chemical properties. Glass-ceramic technology has been used also to develop materials, which exhibit exceptional properties of hot and cold processing such as moldability and machinability, and it aims for better combining flexibility of these material and process characteristics in the future. The greater diversity of microstructure-property arrangements and processing routes over glasses and ceramics are responsible that glass-ceramics are the preferred choice of materials in many technical, consumer, optical, medical/dental, electrical/electronic, and architectural fields. This includes increasing uses of glass-ceramic materials for environment and energy applications in the last decades.The positive development of glass-ceramic technology has become true in particular due to the pioneering spirit, resourcefulness, and courage of researchers of the first generation. Extraordinary and, therefore, to be distinguished is the work of the glass-ceramic inventor S. Donald Stookey (Beall) to whom this Research Topic is dedicated. He had realized, as early as at the mid of the last century, that glass-ceramic properties are mainly influenced by the controlling of the mechanisms of nucleation and crystal growth to achieve desired microstructures in the volume of these materials.The last decades saw development of the downstream thermal treatment of formed glass parts (called "ceramming") for a large variety of chemical systems, while nowadays, sintering of glass powders is available as a powerful route for glass-ceramic processing at lower fabrication temperatures and for complex shapes using powder compacts or slurry deposits on various substrates prepared by dipping, brushing, or spraying techniques or the emerging printing technologies (Höland and Beall, 2012;Müller and Reinsch, 2012). For both fabrication routes, crystal growth at or close to internal and external interfaces induced by heterogeneous nucleation is the key process transforming glass into glass-ceramic. Nucleation agents have been shown to trigger these processes in the volume of transparent glass-ceramics. Their coloration effects are subject of current developments (Nakane and Kawamoto). For sintered glass-ceramics, surface activation treatments by milling glass powders promote heterogeneous nucleation but these processes can cause gas release during the subsequent sintering step. To overcome limitations of sintered glass-ceramics for energy applications, such as SOFC sealants, measures to reduce the bubble formation are now being studied intensively (Agea-Blanco et al.). Further, activation of both heterogeneous surface and heterogeneous volume nucleation processes of sintered glass-ceramics is currently gaining importance for dental applications (Rampf et al.). ...

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Viscous‐Phase Silicate Processing

Cited by 19 publications

References 195 publications

Sintering and Foaming of Barium Silicate Glass Powder Compacts

Sintering and Foaming of Barium Silicate Glass Powder Compacts

Sintering and piezoelectric properties of K0.5Na0.5NbO3 glass microspheres

Editorial: Nucleation and Crystallization of Glasses and Glass-Ceramics

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