High temperature seal compositions and methods of using same

Patent metadata

Field	Value
Publication number	US-2016347972-A1
Application number	US-201514725780-A
Country	US
Kind code	A1
Filing date	May 29, 2015
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

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.

First claim

What is claimed is:

1 . A sealant composition comprising:
a first inorganic oxide chosen from at least one of MgSiO 3 , MgTiO 3 , MgO, CaO, and CaSiO 3 ; a second inorganic oxide chosen from SiO 2 ; at least one solvent; and optionally at least one organic resin binder; wherein the SiO 2 is present in an amount of at least about 50 mole %, relative to the total amount of inorganic oxide; and wherein the coefficient of thermal expansion of the sealant composition is less than or equal to about 8×10 −6 /° C.

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 any 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 any 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 , further comprising at least one additional inorganic oxide, wherein the total amount of additional inorganic oxide is less than about 10 mole %, relative to the total amount of inorganic oxide.

9 . The sealant composition of claim 8 , wherein the at least one additional inorganic oxide is chosen from BaO, SrO, TiO 2 , ZrO 2 , ZnO, Al 2 O 3 , rare earth oxides, and combinations thereof.

10 . 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:
a first inorganic oxide chosen from at least one of MgSiO 3 , MgTiO 3 , MgO, CaO, and CaSiO 3 ;
a second inorganic oxide chosen from SiO 2 ;
at least one solvent;
optionally at least one organic resin binder;
wherein the SiO 2 is present in an amount of at least about 50 mole %, relative to the total amount of inorganic oxide.

11 . The method of claim 10 , further comprising reducing the pressure to less than 10 kPa.

12 . The method of claim 10 , wherein the sealant composition comprises SiO 2 in an amount of at least about 55 mole %, relative to the total amount of inorganic oxide.

13 . The method of claim 10 , wherein the sealant composition comprises SiO 2 in an amount of at least about 60 mole %, relative to the total amount of inorganic oxide.

14 . The method of claim 10 , wherein the sealant composition SiO 2 in an amount of about 75 to about 85 mole %, relative to the total amount of inorganic oxide.

15 . The method of claim 10 , wherein the sealant composition comprises at least one solvent chosen from water, organic solvents, and mixtures thereof.

16 . The method of claim 10 , 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.

17 . The method of claim 10 , wherein the sealant composition comprises at least one organic resin binder chosen from cellulose derivatives, polyurethanes, acrylics, terpenes, and styrenes.

18 . The method of claim 10 , wherein the sealant composition comprises at least one additional inorganic oxide, wherein the total amount of additional inorganic oxide is less than about 10 mole %, relative to the total amount of inorganic oxide.

19 . The method of claim 18 , wherein the at least one additional inorganic oxide is chosen from BaO, SrO, TiO 2 , ZrO 2 , ZnO, Al 2 O 3 , rare earth oxides, and combinations thereof.

20 . 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:
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;
optionally at least one organic resin binder;
wherein the second inorganic oxide is present in an amount of at least about 50 mole %, relative to the total amount of inorganic oxide; and wherein the coefficient of thermal expansion of the sealant composition is less than or equal to about 8×10 −6 /° C.

Assignees

• Palo Alto Res Ct Inc

Inventors

• Solberg Scott Eugene

Classifications

• C09K3/1003

  Pure inorganic mixtures · CPC title

• C04B2237/062

  based on silica or silicates · CPC title

• C04B2237/122

  based on refractory metals · CPC title

• C04B2237/76

  Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc · CPC title

• C03C8/24 Primary

  Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders · CPC title