CERAMIC MATERIALS

The present invention relates to glass-ceramic/silver composite precursor compositions in the form of powders, and to glass-ceramics/silver composite materials produced therefrom. Such materials find particular use as interconnect materials for high temperature electrochemical conversion devices such as solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs). 1. A chromium-free , glass-ceramic/silver composite precursor composition comprising:silver-based particles; and{'sub': 2', '3', '2', '2', '3', '2, 'glass-ceramic precursor particles formed from a material having the general formula xAO-yAlO-zSiOin which AO represents an alkaline earth oxide or mixture of alkaline earth oxides and x, y and z represent the mol % of AO, AlOand SiO, respectively, and in which x=30-60 mol %, y=0-20 mol %, and z=35-65 mol %;'}wherein said composition comprises 30-70 wt % of said silver-based particles, based on the combined weight of said silver-based particles and said glass-ceramic precursor particles.2. A composition as claimed in in the form of a powder.3. A composition as claimed in or claim 1 , wherein x=35-55 mol %; y=0-15 mol %; and z=40-60 mol %.4. A composition as claimed in any one of to claim 1 , wherein said glass-ceramic precursor particles contain one or more of the following metal oxides: MgO claim 1 , CaO claim 1 , BaO claim 1 , SrO claim 1 , ZnO claim 1 , LaO claim 1 , ZrGand PO claim 1 , or mixtures thereof.5. A composition as claimed in any one of to which comprises 40-70 wt % silver-based particles claim 1 , such as 50-70 wt % silver-based particles.6. A composition as claimed in any one of to claim 1 , wherein said silver-based particles are silver particles.7. A composition as claimed in any one of to claim 1 , wherein said silver-based particles are silver-alloy particles claim 1 , such as silver-palladium alloy particles.8. A composition as claimed claim 7 , wherein said silver-alloy particles comprise at least 50 wt % silver.9. A ...

SEALING COMPOSITIONS

The present invention relates to compositions in the form of precursor glass powders, pastes and preforms comprising said precursor glass powders, and glass-ceramics produced from the precursor glass powders, pastes or preforms. 1. A glass precursor sealing composition comprising:{'sub': 2', '3, '(I) 14-35 mol % AlO;'}(II) 31-52 mol % CaO; and{'sub': '2', '(III) 25-45 mol % SiO;'}{'sub': 2', '3, 'said composition being free of BO.'}2. A composition according to comprising 21 to 35 mol % AlO.3. A composition according to wherein the composition comprises 35 to 47 mol % CaO.4. A composition according to wherein the composition comprises 35 to 45 mol % SiO.5. A composition according to further comprising one or more of ZrO claim 1 , TiO claim 1 , PO claim 1 , BaO claim 1 , LaO claim 1 , YO claim 1 , or NbO.6. A composition according to in the form of a powder.7. A composition according to which has an MgO content of 1 mol % or less claim 1 , such as 0.5 mol % or less; anda ZnO content of 1 mol % or less.8. A composition according to consisting of AlO claim 1 , CaO claim 1 , SiOand optionally one or more oxides selected from PO claim 1 , YO claim 1 , and ZrO.9. A composition according to consisting of AlO claim 1 , CaO claim 1 , SiOand optionally a single oxide selected from PO claim 1 , YO claim 1 , or ZrO.10. A composition according to consisting of AlO claim 1 , CaO claim 1 , SiOand optionally one or more oxides selected from PO claim 1 , YO claim 1 , and BaO.11. A composition according to having a minimum viscosity when measured on a sintered disc in accordance with ASTM C1351M-96(2012) of 10to 10Pa·s.12. A paste claim 1 , preform or sintered preform comprising a glass precursor sealing composition according to .13. A preform comprising a sintered composition according to .14. A glass-ceramic composition comprising the composition according to .15. A glass-ceramic composition according to wherein the composition has a coefficient of thermal expansion (CTE) of 5.5 to ...

Sealing compositions

The present invention relates to compositions in the form of precursor glass powders, pastes and preforms comprising said precursor glass powders and glass-ceramics produced from the precursor glass powders, pastes or preforms. The present invention also relates to a method of forming a seal between a first and second material with a glass-ceramic, and a joint comprising a first material, a second material and a glass-ceramic sealing material joining the first and second materials together.

Ceramic materials

Sealing compositions

The present invention relates to compositions in the form of precursor glass powders, pastes and preforms comprising said precursor glass powders, and glass-ceramics produced from the precursor glass powders, pastes or preforms. The present invention also relates to a method of forming a seal between a first and second material with a glass-ceramic, and a joint comprising a first material, a second material and a glass-ceramic sealing material joining the first and second materials together.

Sealing compositions

The present invention relates to compositions in the form of precursor glass powders, pastes and preforms comprising said precursor glass powders and glass- ceramics produced from the precursor glass powders, pastes or preforms. The present invention also relates to a method of forming a seal between a first and second material with a glass-ceramic, and a joint comprising a first material, a second material and a glass-ceramic sealing material joining the first and second materials together.