Cermet feedthrough in ceramic multilayer body

1. A composite, comprising a layer sequence;

wherein the layer sequence

a) comprises as layers

i) a first layer, comprising

A. a first ceramic, and

B. a first layer surface,

ii) a second layer,

A. comprising a second ceramic,

B. superimposing the first layer surface;

b) comprises

i) a hole, connecting through each layer of the layer sequence;

ii) a cermet element;

wherein the cermet element comprises a first part and a second part;

wherein the first part is comprised by the hole;

wherein the second part is comprised between the first layer and the second layer;

wherein the cermet element is in one piece.

2. The composite of claim 1 ,

wherein the layer sequence further comprises n layers;

wherein each i th layer comprises an i th layer surface and an i th ceramic;

wherein each i th layer superimposes the (i−1) st layer surface;

wherein the cermet element further comprises n parts;

wherein each i th part is comprised between the i th layer and the (i−1) st layer;

wherein n is an integer, being at least 1;

wherein i is an index which can be any integer selected from the range from 2 to (n+2).

3. The composite of claim 1 , wherein the cermet element, or at least one of the further cermet elements, or both comprise:

a) Pt in the range from 60 weight % to the remainder completing the sum of all components to 100 weight %; and

b) Al 2 O 3 in the range from 0.5 to 25 weight %;

each based on the total weight of the cermet element, or the further cermet element.

4. The composite of claim 1 , wherein the second part has a thickness at its widest portion of at least 3 μm.

5. The composite of claim 1 , wherein the second part has a length in the range from 5 to 200 μm.

6. The composite of claim 1 , wherein the first layer or the second layer or both have a thickness in the range from 75 to 600 μm.

7. The composite of claim 1 , wherein the hole has a diameter in the range from 100 to 800 μm.

8. The composite of claim 1 , wherein the composite further comprises a ceramic body,

wherein the ceramic body

a) comprises a ceramic body layer,

i) comprising a ceramic body layer surface,

ii) superimposing the layer sequence such that the ceramic body layer surface covers the hole;

b) comprises a blind hole, comprising a blind hole front face, a blind hole end face, and a lateral surface;

wherein the blind hole front face is an opening in a body surface of the ceramic body;

wherein the body surface is different from the ceramic body layer surface;

wherein the blind hole end face is comprised by the ceramic body;

wherein the hole connects to the lateral surface;

wherein the first part of the cermet element connects to the lateral surface.

9. A device comprising a hollow body, an inner volume, an outer volume, and the composite of claim 1 ;

wherein the hollow body

a) encloses the inner volume,

b) separates the inner volume from the outer volume,

c) comprises an aperture;

wherein the aperture comprises the composite;

wherein the composite electrically connects the inner volume to the outer volume.

10. A device comprising a hollow body, an inner volume, an outer volume, and the composite of claim 1 ;

wherein the hollow body

a) encloses the inner volume,

b) separates the inner volume from the outer volume,

c) comprises an aperture;

wherein the aperture frames the composite;

wherein the blind hole end face is comprised by the inner volume.

11. A use of a plurality of ceramic green sheets and a composition to produce the composite of claim 1 ;

wherein the composition comprises

a) Pt in the range from 60 weight % to the remainder completing the sum of all components to 100 weight %,

b) Al 2 O 3 in the range from 0.5 to 25 weight %,

c) a vehicle in the range from 8 to 30 weight %,

each based on the total weight of the composition.

12. A method comprising:

a) providing a first ceramic green sheet, comprising a first hole and a first ceramic green sheet surface, wherein the first hole has a first hole volume;

b) providing a plurality of portions of a first cermet precursor composition, wherein the plurality of portions of the first cermet precursor composition has a total first cermet precursor composition volume, wherein the total first cermet precursor composition volume is higher than the first hole volume; and

c) filling the plurality of portions of the first cermet precursor composition into the first hole in subsequent fill-in steps portion by portion, wherein after each fill-in step a filled in portion of the first cermet precursor composition is dried.

13. The method of claim 12 , further comprising:

a) providing a further ceramic green sheet, comprising a further hole and a further ceramic green sheet surface, wherein the further hole has a further hole volume;

b) providing a further plurality of portions of a further cermet precursor composition, wherein the further plurality of portions of the further cermet precursor composition has a total further cermet precursor composition volume, and wherein the total further cermet precursor composition volume is higher than the further hole volume;

c) filling the further plurality of portions of the further cermet precursor composition into the further hole in subsequent fill-in steps portion by portion, wherein after each fill-in step a filled in portion of the further cermet precursor composition is dried;

d) contacting the first ceramic green sheet surface with the further ceramic green sheet surface, wherein the first hole and the further hole are contacted; and

e) firing the first ceramic green sheet and the further ceramic green sheet.

14. The method of claim 12 , wherein the first cermet precursor composition, or the further cermet precursor composition, or both comprises

a) Pt in the range from 60 weight % to the remainder completing the sum of all components to weight %,

b) Al 2 O 3 in the range from 0.5 to 25 weight %,

c) a vehicle in the range from 8 to 30 weight %,

each based on the total weight of the first cermet precursor composition or the further cermet precursor composition.

15. The method of claim 12 , wherein the contacting of the first ceramic green sheet surface with the further ceramic green sheet surface is a laminating.

16. A composite obtainable by the method of claim 12 .