1989
DOI: 10.2172/274153
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Sealing 304L to lithia-alumina-silica (LAS) glass-ceramics

Abstract: The f o m t i c n of a crack-free seal between a 300 series stainless steel an3 a glass-cemnic hzs in the past been very difficult. 'IZle p r L q cause of this difficdty Therefore, the ccrresponding g l a s s d c &mild have a similarly high t o w i l e the formtion of stress-free seals. Both a t E-M;-Mound and a t M;&G Zlect;-cnic ccxipnents, lithia-alumina-silica (m) glass-cadcs have ncw been scccessfully developed and sealed to 304L stainless steel. These mck-free seals have keen routinely fabricated using t… Show more

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“…The nucleation‐crystallization sequence is dictated by the thermal profiles. An attempt of sealing 304L stainless steel to lithia‐alumina‐silica glass‐ceramic incorporated a sealing temperature over 1000°C at which the glass‐ceramic is completely devitrified. The nucleation occurs at a low temperature (650°C–675°C) followed by a crystallization of Cristobalite at a higher temperature (800°C–830°C) to form high expansion glass‐ceramics.…”
Section: Introductionmentioning
confidence: 99%
“…The nucleation‐crystallization sequence is dictated by the thermal profiles. An attempt of sealing 304L stainless steel to lithia‐alumina‐silica glass‐ceramic incorporated a sealing temperature over 1000°C at which the glass‐ceramic is completely devitrified. The nucleation occurs at a low temperature (650°C–675°C) followed by a crystallization of Cristobalite at a higher temperature (800°C–830°C) to form high expansion glass‐ceramics.…”
Section: Introductionmentioning
confidence: 99%
“…It has been known for a long time that silicate glasses containing lithia are particularly useful for glass-to-steel seals. These glasses crystallize at an easily accessible temperature and give rise to a glass-ceramic consisting of lithium disilicate (Borom et aI 1975;McCollister and Reed 1983;Haws et al 1986;Loehman and Headley 1987;Cassidy and Moddeman 1989;Moddeman et al 1989). The presently used sealing glass compositions contain several additives such as alumina, phosphorous pentoxide and alkali oxides, and understanding of the role of such additives requires further investigation.…”
Section: Introductionmentioning
confidence: 99%
“…For example the structural role of P205 as nucleating agent and the mechanism of action of AI20 3 in smoothing out thermal strains during partial ceramization are still unclear. Special schedules of thermal treatment are also in vogue in the applications of lithia-based silicate glass-ceramics (Borom et al 1975;McCollister and Reed 1983;Headley and Loehman 1984;Haws et al 1986;Moddeman et al 1989), and it would be interesting to understand the critical role of such heat treatment schedules. We therefore feel that it is important to investigate in detail this industrial glass-ceramic in order to appreciate clearly the role of the additives and the importance of the thermal histories accorded to glassceramics in their applications.…”
Section: Introductionmentioning
confidence: 99%