Effects of Al2O3 nanoparticles on the properties of glass matrix composites for sealant applications

Liu, Zheng; Cai, Yangyang; Gong, Keqian; Wang, Chen; Zhang, Yong

doi:10.1016/j.ceramint.2023.06.234

Cited by 5 publications

(2 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, the surge in the stress value at the edge of the seal in region III was substantially due to the direct contact between the metal housing and the glass. The CTE of the ruby filling glass was 6.7 × 10 −6 (room temperature‐550°C), 32 and the CTE of the 304SS was 19.7 × 10 −6 (50–700°C), 23 so the glass here was greatly compressed by the cooling contraction of the metal.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence spectroscopy to detect microregion stress distribution in glass‐to‐metal seals

Liu,

Gong,

Cai

et al. 2024

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

The stress distribution in sealing glass is one of the most concerning issues for glass‐to‐metal (GtM) seals. In this study, photoluminescence spectroscopy was applied by exploiting the piezospectroscopic effect of Cr‐doped α‐Al2O3 (ruby), and the overall stress distribution along the radius of a concentric seal was detected and analyzed. It was discovered that the compressive stress first increased and then decreased at the edge of the seal. The maximum compressive stress of 91 MPa was detected at ∼20 µm from the interface and was ascribed to the interaction between the glass and surface oxide film of the metal. Stress distributions in pore regions were also investigated and obvious stress fluctuations were observed clustering around pores. A circle of compressive stress was observed around the pores in a single glass without a metal housing; for the pores in the center of the concentric seal, the stress distribution was dominated by the inner contraction of the metal housing; and for the pores near the edge of the seal, the concentration of tensile stress located perpendicular to that of the compressive stress. This study demonstrates a high‐resolved and nondestructive method to detect the stress field and explores the potential for future tailorability of stress distribution in GtM seals.

show abstract

Section: Resultsmentioning

confidence: 99%

Photoluminescence spectroscopy to detect microregion stress distribution in glass‐to‐metal seals

Liu,

Gong,

Cai

et al. 2024

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Then, a finite element model was established. It is believed that 5 wt.% alumina filler does not significantly change the physical and mechanical properties of glass, 53 and thus the inner part of the pre-stressed sample was presumptively set as a single glass in the finite element model. The dynamic process of cooling from T g to T r was simulated.…”

Section: Experimental Evidencementioning

confidence: 99%

Calibration for determination of compressive stress in glass‐to‐metal seals via photoluminescence spectroscopy

Liu,

Cai,

Gong

et al. 2023

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

Compressive stress in glass‐to‐metal seals is crucial to ensure sealing quality and service reliability. Photoluminescence spectroscopy (PS), which relies on the piezospectroscopic effect of Cr‐doped α‐Al2O3, shows promise for stress detection owing to its rapid detection, non‐destruction, and high resolution. The premise of the PS technique is to fill a glass matrix with alumina particles and detect signals from the alumina. In this study, the interaction between alumina particles and the glass matrix was analyzed to calibrate the measured stresses and investigate the stress state in the glass. Test results for glass‐to‐metal seals are believed to consist of simultaneous internal residual stress and external applied stress. The internal residual stress is formed due to the coefficient of thermal expansion mismatch between glass and alumina and is assumed to transfer by radial compression. In the experiment, it was detected by the PS technique and verified by X‐ray diffraction using an unstressed sample without metal housing. The external applied stress is formed due to metal housing compaction and possibly transferred by the shear effect. The stress distribution within the pre‐stressed sample containing metal housing was also measured by the PS technique. Then, calibrations were conducted on the measured stresses based on the deduced stress transfer relationships. Finally, finite element models were established to simulate the internal residual stress and external applied stress respectively to prove the validity of the calibration method, and mutually anastomotic results were obtained within the target margin of error.

show abstract

A novel non-crystallizing Na2O-K2O-TiO2 silicate glass sealant for protonic ceramic fuel cell applications

Gao,

Si,

et al. 2024

Ceramics International

View full text Add to dashboard Cite

Effects of Al2O3 nanoparticles on the properties of glass matrix composites for sealant applications

Cited by 5 publications

References 47 publications

Photoluminescence spectroscopy to detect microregion stress distribution in glass‐to‐metal seals

Photoluminescence spectroscopy to detect microregion stress distribution in glass‐to‐metal seals

Calibration for determination of compressive stress in glass‐to‐metal seals via photoluminescence spectroscopy

A novel non-crystallizing Na2O-K2O-TiO2 silicate glass sealant for protonic ceramic fuel cell applications

Contact Info

Product

Resources

About