Preparation, properties and chemistry of glass- and glass-ceramic-to-metal seals and coatings

Donald, I. W.

doi:10.1007/bf00354689

Cited by 301 publications

(178 citation statements)

References 75 publications

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“…In general, the same crystalline phases are produced regardless of whether the glass-ceramic is prepared as part of a seal or is made as a bulk material using the standard nucleation and crystallization stages. Sometimes, however, following a sealing cycle does not produce the same results as the conventional two-stage heat treatment, and therefore it should never be assumed that the properties of a bulk glass-ceramic will be the same as those produced as part of a seal or coating [1,5]. When choosing a specific glassceramic for a seal application, it is therefore best practice that a simulated sealing cycle is employed in the initial development process.…”

Section: Practical Aspects Of Glass-and Glass-ceramic-to-metal Componmentioning

confidence: 99%

“…Both lithium zinc silicate (LZS) and lithium aluminosilicate (LAS) glass-ceramics have been successfully sealed to a number of different alloys in the manufacture of electrical feed-through components [1,5]. It was observed that extensive interfacial reactions may occur during this process to give a variety of precipitated products, as illustrated in Fig.…”

Section: Fe-based Alloysmentioning

confidence: 99%

“…In many instances this will not be feasible because the thermal expansion behaviour of a given glass-ceramic may be very dependent not only on the precise crystallization temperature but also on the actual sealing temperature, and there may only be relatively narrow processing windows which yield the required expansion characteristics [1,5]. In other cases, pre-oxidation of the metal prior to sealing may also influence the diffusion of undesirable metallic species from the substrate, as illustrated by Fig.…”

Section: Fe-based Alloysmentioning

confidence: 99%

“…As reviewed by Donald, extensive work has been reported on the sealing of glassceramics to a variety of Ni-based superalloys [1,5]. For example, Hong and Holland [13] noted that in the absence of a pre-oxidation stage, glass-ceramic coatings on Nimonic 263 alloy were coarse grained.…”

Section: Ni-based Superalloysmentioning

confidence: 99%

“…, and therefore reaction with P 2 O 5 was avoided, resulting in a fine grained microstructure. In studies by Donald [1,5], a variety of Ni-based superalloys have been sealed to a lithium zinc silicate glass-ceramic. Particularly good seals were achieved to Hastelloy C276 alloy, as seen in Fig.…”

Section: Ni-based Superalloysmentioning

confidence: 99%

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Recent developments in the preparation, characterization and applications of glass- and glass–ceramic-to-metal seals and coatings

et al. 2011

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There has, in recent years, been a major revival of interest in glass-and glass-ceramic-to-metal seals and coatings for new applications. Experience dictates that many factors need to be taken into consideration in the successful design and manufacture of high-quality seals, particularly if an adequate component lifetime is to be achieved. For example, during their preparation, undesirable reactions may occur between diffusing metal species and glass constituents, and these can lead to the formation of highly localized internal stresses, which can initiate failure of a seal either during manufacture or, more seriously, whilst in service due to the influence of static fatigue. In the case of high-temperature systems, reactions under hostile operating conditions also need to be taken into consideration. In this review, the factors learnt from past experience that influence the formation and lifetime behaviour of glass and glass-ceramic/metal systems are briefly introduced, and their relevance to the newer applications including solid oxide fuel cell sealants and coatings on titanium for biomedical applications is discussed.

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Section: Practical Aspects Of Glass-and Glass-ceramic-to-metal Componmentioning

confidence: 99%

Section: Fe-based Alloysmentioning

confidence: 99%

Section: Fe-based Alloysmentioning

confidence: 99%

Section: Ni-based Superalloysmentioning

confidence: 99%

Section: Ni-based Superalloysmentioning

confidence: 99%

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Recent developments in the preparation, characterization and applications of glass- and glass–ceramic-to-metal seals and coatings

et al. 2011

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Glass-based coatings for titanium implant alloys

Gomez-Vega

Saiz

Tomsia

1999

J. Biomed. Mater. Res.

128

106

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Glass coatings on Ti6Al4V were prepared using a simple enameling technique. The composition of the glasses was tailored to match the thermal expansion of Ti6Al4V. By controlling the firing atmosphere, time, and temperature, it was possible to control the reactivity between the glass and the alloy and to fabricate coatings (25-150 micron thick) with excellent adhesion to the substrate. The optimum firing temperatures ranged between 800 and 840 degrees C at times up to 1 min in air or 15 min in N2. The same basic technique was used to prepare multilayered coatings with graded composition or with hydroxyapatite (HA) particles embedded in the outer layer. Some of these coatings presented excellent adhesion to the substrate and were able to form HA during in vitro tests in simulated body fluid.

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Structural and Physical Properties of Iron Oxychloride Phosphate Glasses

Moustafa

El-Adawy

2000

phys. stat. sol. (a)

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Glasses in the system xFeCl 3 ±10Fe 2 O 3 ±(90±x)P 2 O 5 have been prepared by the normal quenching method over a wide range of composition (x 15 up to 50 mol%). The glass structure has been investigated using IR spectral analyses which shows that the intermediate range order is affected by substitution of FeCl 3 for P 2 O 5 . Thermal expansion coefficient, glass transition temperature, density and dissolution rate in HCl were also investigated. The formation of P±O±Fe and P±Cl bonds at the expense of PO bonds is responsible for the good chemical durability of the studied glasses. Changes in other properties are interpreted in terms of the depolymerization of the glassy matrix by FeCl 3 .Y.M. Moustafa and A. El-Adawy: Structural and Physical Properties of Glasses

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Preparation, properties and chemistry of glass- and glass-ceramic-to-metal seals and coatings

Cited by 301 publications

References 75 publications

Recent developments in the preparation, characterization and applications of glass- and glass–ceramic-to-metal seals and coatings

Recent developments in the preparation, characterization and applications of glass- and glass–ceramic-to-metal seals and coatings

Glass-based coatings for titanium implant alloys

Structural and Physical Properties of Iron Oxychloride Phosphate Glasses

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