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Title: Sealing glass-ceramics with near-linear thermal strain, part III: Stress modeling of strain and strain rate matched glass-ceramic to metal seals

Thermal mechanical stresses of glass-ceramic to stainless steel (GCtSS) seals are analyzed using finite element modeling over a temperature cycle from a set temperature (T set) 500°C to -55°C, and then back to 600°C. There are two glass-ceramics that have an identical coefficient of thermal expansion (CTE) at ~16 ppm/°C but have very different linearity of thermal strains, designated as near-linear NL16 and step-like SL16, and were formed from the same parent glass using different crystallization processes. Stress modeling reveals much higher plastic strain in the stainless steel using SL16 glass-ceramic when the GCtSS seal cools from T set. Upon heating tensile stresses start to develop at the GC-SS interface before the temperature reaches T set. On the other hand, the much lower plastic deformation in stainless steel accumulated during cooling using NL16 glass-ceramic allows for radially compressive stress at the GC-SS interface to remain present when the seal is heated back to T set. Finally, the qualitative stress comparison suggests that with a better match of thermal strain rate to that of stainless steel, the NL16 glass-ceramic not only improves the hermeticity of the GCtSS seals, but would also improve the reliability of the seals exposed to high-temperature and/ormore » high-pressure abnormal environments.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND2016-10169J
Journal ID: ISSN 0002-7820; 648180
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 100; Journal Issue: 8; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; glass-ceramics; modeling/model; strain; stress; thermal expansion
OSTI Identifier:
1399893
Alternate Identifier(s):
OSTI ID: 1373821

Dai, Steve, Elisberg, Brenton, Calderone, James, and Lyon, Nathan. Sealing glass-ceramics with near-linear thermal strain, part III: Stress modeling of strain and strain rate matched glass-ceramic to metal seals. United States: N. p., Web. doi:10.1111/jace.14821.
Dai, Steve, Elisberg, Brenton, Calderone, James, & Lyon, Nathan. Sealing glass-ceramics with near-linear thermal strain, part III: Stress modeling of strain and strain rate matched glass-ceramic to metal seals. United States. doi:10.1111/jace.14821.
Dai, Steve, Elisberg, Brenton, Calderone, James, and Lyon, Nathan. 2017. "Sealing glass-ceramics with near-linear thermal strain, part III: Stress modeling of strain and strain rate matched glass-ceramic to metal seals". United States. doi:10.1111/jace.14821. https://www.osti.gov/servlets/purl/1399893.
@article{osti_1399893,
title = {Sealing glass-ceramics with near-linear thermal strain, part III: Stress modeling of strain and strain rate matched glass-ceramic to metal seals},
author = {Dai, Steve and Elisberg, Brenton and Calderone, James and Lyon, Nathan},
abstractNote = {Thermal mechanical stresses of glass-ceramic to stainless steel (GCtSS) seals are analyzed using finite element modeling over a temperature cycle from a set temperature (Tset) 500°C to -55°C, and then back to 600°C. There are two glass-ceramics that have an identical coefficient of thermal expansion (CTE) at ~16 ppm/°C but have very different linearity of thermal strains, designated as near-linear NL16 and step-like SL16, and were formed from the same parent glass using different crystallization processes. Stress modeling reveals much higher plastic strain in the stainless steel using SL16 glass-ceramic when the GCtSS seal cools from Tset. Upon heating tensile stresses start to develop at the GC-SS interface before the temperature reaches Tset. On the other hand, the much lower plastic deformation in stainless steel accumulated during cooling using NL16 glass-ceramic allows for radially compressive stress at the GC-SS interface to remain present when the seal is heated back to Tset. Finally, the qualitative stress comparison suggests that with a better match of thermal strain rate to that of stainless steel, the NL16 glass-ceramic not only improves the hermeticity of the GCtSS seals, but would also improve the reliability of the seals exposed to high-temperature and/or high-pressure abnormal environments.},
doi = {10.1111/jace.14821},
journal = {Journal of the American Ceramic Society},
number = 8,
volume = 100,
place = {United States},
year = {2017},
month = {4}
}

Works referenced in this record:

Crystallization of a Glass-Ceramic by Epitaxial Growth
journal, September 1984

Design of High Thermal Expansion Glass-Ceramics Through Microstructural Control
book, January 1987

Crystallization Kinetics of a Complex Lithium Silicate Glass-Ceramic
journal, August 1987