Vitreous or at least partly crystallised sealing material, joint connection, barrier layer, and layer system comprising the sealing material and integration thereof into components
Vitreous or at least partly crystallized sealing material is provided. The sealing material is from the system SiO 2 —B 2 O 3 —CaO—MgO, which is free from BaO and/or SrO and which has an improved coefficient of thermal expansion and improved crystallization properties. The sealing material is employed to produce joint connections, electrical feedthroughs, and/or as a barrier layer.
1. A vitreous or at least partly crystallised sealing material, comprising:
a composition comprising (in mol %, based on oxide):
SiO 2
25-45;
B 2 O 3
5-less than 20;
Al 2 O 3
0-5;
CaO
4-30;
MgO
greater than 30-40;
CeO 2
0-10;
La 2 O 3
0-10;
Y 2 O 3
0-10;
TiO 2
0-10;
ZrO 2
0-10;
SnO 2
0-10;
HfO 2
0-10; and
R 2 O 3
0-10,
wherein R 2 O 3 is an oxide selected, individually or in any desired combination, from a group consisting of Ga 2 O 3 , In 2 O 3 , Dy 2 O 3 , Yb 2 O 3 , and any combinations thereof, and
wherein the composition is free from BaO and SrO apart from at most impurities.
2. The sealing material of claim 1 , further comprising a coefficient of thermal expansion in the at least partly crystallised state of α (20-700) ≥10.0·10 −6 K −1 .
3. The sealing material of claim 1 , wherein the composition comprises (in mol %, based on oxide):
SiO 2
25-45;
B 2 O 3
5-18;
Al 2 O 3
0-5;
CaO
greater than 15-30;
MgO
greater than 30-40;
CeO 2
0-10;
La 2 O 3
0-10;
Y 2 O 3
0-10;
TiO 2
0-10;
ZrO 2
0-10;
SnO 2
0-10;
HfO 2
0-10; and
R 2 O 3
0-10.
4. The sealing material of claim 1 , wherein the composition comprises (in mol %, based on oxide):
SiO 2
25-less than 35;
B 2 O 3
5-less than 20;
Al 2 O 3
0-5;
CaO
4-less than 15;
MgO
greater than 30-40;
CeO 2
0-10;
La 2 O 3
0-10;
Y 2 O 3
0-10;
TiO 2
0-10;
ZrO 2
0-10;
SnO 2
0-10;
HfO 2
0-10; and
R 2 O 3
0-10.
5. The sealing material of claim 1 , wherein the composition has a lower limit of B 2 O 3 that is 7% (in mol %, based on oxide).
6. The sealing material of claim 1 , wherein the composition comprises (in mol %, based on oxide), individually or in any combination,
Al 2 O 3
0-less than 2.1;
ZnO
0-less than 5; and
Y 2 O 3
greater than 0-10.
7. The sealing material of claim 1 , wherein the crystalline phase in the at least partly crystallised state comprises at least one compound selected from a group consisting of CaSiO 3 (wollastonite), MgSiO 3 (enstatite), Mg 2 SiO 4 (forsterite), CaMgSiO 4 (monticellite), CaMgSi 2 O 6 (diopside), Ca 2 MgSi 2 O 7 (akermanite), and any combinations thereof.
8. The sealing material of claim 1 , further comprising up to 30 wt. % of inorganic fillers selected from a group consisting of Al 2 O 3 , stabilised ZrO 2 , MgO, MgSiO 3 (enstatite), Mg 2 SiO 4 (forsterite), CaMgSiO 4 (monticellite), CaMgSi 2 O 6 (diopside), Ca 2 MgSi 2 O 7 (akermanite), and any combinations thereof.
9. The sealing material of claim 1 , wherein the sealing material is configured for a use selected from the group consisting of a fuel cell, an electrolysis cell, a feedthrough element, a sensor, an actuator, production of sintered bodies, production of sheetings, an additive material glass, an additive material in glass-ceramics, and any combinations thereof.
10. A composition comprising:
a component made of metal or ceramic, wherein the metal comprises chromium-containing steel and/or chromium-containing alloy and the ceramic comprises Al 2 O 3 and/or stabilised zirconium oxide, wherein the stabilising is effected by one or more oxides selected from a group consisting of Y 2 O 3 , Sc 2 O 3 , CaO, MgO and/or CeO 2 ; and
a barrier layer on the component, wherein the barrier layer comprises the sealing layer of claim 1 .
11. A joint connection, comprising:
a first component;
a second component; and
the sealing material of claim 1 joining the first and second components, wherein the first and second components are selected from a group consisting of a metal component and a ceramic component, the metal component comprising chromium-containing steels and/or chromium alloys and/or nickel alloys, the ceramic component comprising Al 2 O 3 and/or stabilised zirconium oxide, wherein the stabilising is effected by one or more oxides selected from a group consisting of Y 2 O 3 , Sc 2 O 3 , CaO, MgO and/or CeO 2 .
12. A layer system, comprising:
a first element;
a second element;
the sealing material of claim 1 between the first and second elements; and
at least one further glass-based sealing material applied to the sealing material at least in regions,
wherein the first and second elements are selected from a group consisting of a metal element and a ceramic element,
wherein the metal element comprises chromium-containing steel and/or chromium-containing alloys and/or nickel-containing alloys and the ceramic element comprises Al 2 O 3 -based ceramics and/or stabilised zirconium oxide.
13. The layer system of claim 12 , comprising a layer sequence having the metal and/or ceramic element, followed by the sealing material, followed by the further glass-based sealing material, followed by the sealing material, followed by the metal and/or ceramic element.
14. The sealing material of claim 1 , further comprising a ratio of SiO 2 /MgO from 0.6 to 1.4.
15. The sealing material of claim 1 , further comprising a ratio of MgO/CaO of from greater than 1.1 to less than 10.
16. The sealing material of claim 1 , wherein the composition comprises more than 31.1 of MgO (in mol %, based on oxide).