Lead-through or connecting element with improved thermal loading capability

Patent metadata

Field	Value
Publication number	US-10138157-B2
Application number	US-201715629969-A
Country	US
Kind code	B2
Filing date	Jun 22, 2017
Priority date	Dec 22, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A lead-through or connecting element is provided that includes an assembly having a carrier body of a high-temperature alloy, a functional element, and an at least partially crystallized glass. The crystallized glass is between a portion of the functional element and a portion of the carrier body. The carrier body subjects the crystallized glass to a compressive stress of greater than or equal to zero, at a temperature from at least 20° C. to more than 450° C. Also provided are a method for producing a lead-through or connecting element, the use of such a lead-through or connecting element, and to a measuring device including such a lead-through or connecting element.

First claim

What is claimed is:

1. A lead-through or connecting element, comprising:
a carrier body comprising a high-temperature alloy;
a functional element;
an at least partially crystallized glass, wherein the at least partially crystallized glass is arranged either between a portion of the functional element and a portion of the carrier body or within the portion of the carrier body, wherein the carrier body subjects the at least partially crystallized glass to a compressive stress of greater than or equal to zero at a temperature range from at least 10° C. to more than 450° C.; and
an inversion temperature that corresponds to a maximum operating temperature with a deviation of +/−20%, wherein the maximum operating temperature is above 450° C.

2. The lead-through or connecting element of claim 1 , wherein the maximum operating temperature is up to 1200° C.

3. The lead-through or connecting element of claim 1 , wherein the temperature range is from at least 10° C. to more than 900° C.

4. The lead-through or connecting element of claim 1 , wherein, when the temperature range exceeds 950° C., a coefficient of thermal expansion CTE G of the at least partially crystallized glass is smaller than a coefficient of thermal expansion CTE H of the high-temperature alloy by a factor F CTE that is greater than 1.06, except for a deviation of about 5%.

5. The lead-through or connecting element of claim 1 , wherein the at least partially crystallized glass comprises at least one crystal phase and at least one amorphous residual glass phase with a glass transition temperature T g , the at least one crystal phase supporting the at least partially crystallized glass at temperatures above the glass transition temperature T g to prevent the at least partially crystallized glass from being pressed out of the carrier body.

6. The lead-through or connecting element of claim 1 , wherein the at least partially crystallized glass comprises a material selected from the group consisting of a glass, a glass ceramic, and a glass-based crystallized material, the material having a volume resistivity of more than 1.0×10 10 Ωcm at a temperature of 350° C.

7. The lead-through or connecting element of claim 6 , wherein the material comprises the following components on an oxide basis, in mol %:
SiO 2 25-55;
B 2 O 3 0.1-15;
Al 2 O 3 0-15;
MO 20-50; and
M 2 O 0-<2,
wherein MO is selected from the group consisting of MgO, CaO, SrO, and BaO, and any combinations thereof, and
wherein M 2 O is selected from the group consisting of Li 2 O, Na 2 O, K 2 O, and any combinations thereof.

8. The lead-through or connecting element of claim 1 , wherein the carrier body further comprises a first fastener for connecting a functional unit to the carrier body.

9. The lead-through or connecting element of claim 8 , further comprising the functional unit arranged on the carrier body, the functional unit having a second fastener connectable with the first fastener.

10. The lead-through or connecting element of claim 9 , wherein the first and second fasteners are connected by a material bond and/or in form-fitting manner.

11. The lead-through or connecting element of claim 9 , wherein the carrier body hermetically seals a first interface between the carrier body and the at least partially crystallized glass, and wherein the first and second fasteners hermetically seal a second interface between the functional unit and the carrier body.

12. The lead-through or connecting element of claim 9 , wherein the functional unit comprises a mineral-insulated cable.

13. The lead-through or connecting element of claim 9 , wherein the functional unit is selected from the group consisting of a sheath, a conductor sheath, a sensor housing, and an actuator housing.

14. The lead-through or connecting element of claim 9 , wherein the functional unit comprises a hydrogen passages.

15. The lead-through or connecting element of claim 9 , wherein the lead-through or connecting element is configured for use as a measuring device.

Assignees

• Schott Ag

Inventors

• Fritz Oliver
• Meier Georg
• Fink Thomas

Classifications

• H01B17/58

  Tubes, sleeves, beads, or bobbins through which the conductor passes · CPC title

• H01B3/087

  Chemical composition of glass · CPC title

• C03C3/068 Primary

  containing rare earths · 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

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title