High temperature seal compositions and methods of using same
The disclosure relates to sealant compositions for forming hermetic seals, methods of use, and hermetically sealed products. The sealant compositions comprise a first inorganic oxide chosen from at least one of MgSiO 3 , MgO, MgTiO 3 , CaO, and CaSiO 3 , a second inorganic oxide chosen from SiO 2 , at least one solvent, and optionally at least one organic resin binder.
1. A sealant composition comprising:
at least about 10 mole % of an inorganic oxide chosen from MgSiO 3 , MgTiO 3 , MgO, CaO, CaSiO 3 , or any combination thereof;
at least about 50 mole % of SiO 2 ;
less than about 10 mole % of an inorganic oxide chosen from BaO, SrO, TiO 2 , ZrO 2 , ZnO, Al 2 O 3 , rare earth oxides, or any combination thereof;
at least one solvent; and
optionally at least one organic resin binder;
wherein the coefficient of thermal expansion of the sealant composition is less than or equal to about 8×10 −6 /° C., and
wherein the mole percentages are relative to a total molar amount of inorganic oxides included in the sealant composition.
2. The sealant composition of claim 1 , wherein SiO 2 is present in an amount of at least about 55 mole %, relative to the total amount of inorganic oxide.
3. The sealant composition of claim 1 , wherein SiO 2 is present in an amount of at least about 60 mole %, relative to the total amount of inorganic oxide.
4. The sealant composition of claim 1 , wherein the SiO 2 is present in an amount ranging from about 75 to about 85 mole %, relative to the total amount of inorganic oxide.
5. The sealant composition of claim 1 , wherein the at least one solvent is chosen from water, organic solvents, and mixtures thereof.
6. The sealant composition of claim 1 , wherein the at least one solvent is present in an amount greater than or equal to about 30%, by volume, relative to the total volume of the sealant composition prior to firing.
7. The sealant composition of claim 1 , wherein the at least one organic resin binder is chosen from cellulose derivatives, polyurethanes, acrylics, terpenes, and styrenes.
8. The sealant composition of claim 1 , wherein coefficient of thermal expansion of the sealant composition is less than or equal to about 6×10 −6 /° C.
9. A method for forming a hermetic seal comprising:
applying a sealant composition to at least one of a first component and a second component at an area where the first component and second component are to be joined;
adjoining the first component and second component; and
applying heat to the to the first component, second component, and sealant composition to increase the surrounding air temperature to at least about 1000° C.;
wherein the sealant composition comprises:
at least about 10 mole % of an inorganic oxide chosen from MgSiO 3 , MgTiO 3 , MgO, CaO, CaSiO 3 , or any combination thereof;
at least about 50 mole % of SiO 2 ;
less than about 10 mole % of an inorganic oxide chosen from BaO, SrO, TiO 2 , ZrO 2 , ZnO, Al 2 O 3 , rare earth oxides, or any combination thereof;
at least one solvent;
optionally at least one organic resin binder;
wherein the coefficient of thermal expansion of the sealant composition is less than or equal to about 8×10 −6 /° C.; and
wherein the mole percentages are relative to a total molar amount of inorganic oxides included in the sealant composition.
10. The method of claim 9 , further comprising reducing the pressure to less than 10 kPa.
11. The method of claim 9 , wherein the sealant composition comprises SiO 2 in an amount of at least about 55 mole %, relative to the total amount of inorganic oxide.
12. The method of claim 9 , wherein the sealant composition comprises SiO 2 in an amount of at least about 60 mole %, relative to the total amount of inorganic oxide.
13. The method of claim 9 , wherein the sealant composition SiO 2 in an amount of about 75 to about 85 mole %, relative to the total amount of inorganic oxide.
14. The method of claim 9 , wherein the sealant composition comprises at least one solvent chosen from water, organic solvents, and mixtures thereof.
15. The method of claim 9 , wherein the sealant composition comprises at least one solvent in an amount greater than or equal to about 30%, by volume, relative to the total volume of the sealant composition.
16. The method of claim 9 , wherein the sealant composition comprises at least one organic resin binder chosen from cellulose derivatives, polyurethanes, acrylics, terpenes, and styrenes.
17. A hermetically sealed container comprising:
a body comprising at least one opening;
a cover sized to close the at least one opening;
a hermetic seal formed between the body and cover, formed from a sealant composition comprising:
at least about 10 mole % of an inorganic oxide chosen from MgSiO 3 , MgO, MgTiO 3 , CaO, CaSiO 3 , or any combination thereof;
at least about 50 mole % of SiO 2 ;
less than about 10 mole % of an inorganic oxide chosen from BaO, SrO, TiO 2 , ZrO 2 , ZnO, Al 2 O 3 , rare earth oxides, or any combination thereof;
at least one solvent;
optionally at least one organic resin binder;
wherein the coefficient of thermal expansion of the sealant composition is less than or equal to about 8×10 −6 /° C., and
wherein the mole percentages are relative to a total molar amount of inorganic oxides included in the sealant composition.