Metal fixing material leadthrough having low susceptibility to faults

Patent metadata

Field	Value
Publication number	US-12125696-B2
Application number	US-202117153518-A
Country	US
Kind code	B2
Filing date	Jan 20, 2021
Priority date	Jul 20, 2018
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

A metal fixing material leadthrough for igniters of airbags and/or belt tighteners includes at least one metal pin fused into a glass or glass-ceramic fixing material in a through-opening of a main body. The metal is present in a post-heated state, with an interface between the fixing material and the metal pin and an additional interface between the fixing material and an inner surface of the through-opening. The at least one metal pin, at least in its core region, consists of stainless steel, such as a chromium-containing stainless steel, the stainless steel having a thermal expansion coefficient.

First claim

What is claimed is:

1. A metal fixing material leadthrough for an igniter of at least one of airbags or belt tensioners, the metal fixing material leadthrough comprising:
a main body having a through-opening formed therein and an upper side; and
at least one metal pin fused into a glass or glass-ceramic fixing material in the through-opening and having a core region, the at least one metal pin, at least in its core region, and the main body, at least on its upper side, are made out of stainless steel made to the EN 10020 standard, the stainless steel of the at least one metal pin and of the main body is selected in such a way that the stainless steel of the at least one metal pin and of the main body form a passivation film on its surface, wherein the at least one metal pin and the main body are made of a compatible material combination in such a way that, at least one of when an ignition bridge is installed or when the upper side is covered with a conductive film, at least one of an anode reaction or a cathode reaction does not occur or occurs only to a small extent on the upper side of the main body, wherein the stainless steel of the at least one metal pin is selected in such a way that, when converted to a standard dimensioning of a metal pin diameter of 1.00±0.03 mm and a metal pin length of 11.68±0.02 mm, the at least one metal pin has a maximum elastic deflection W max of at least 0.13 mm.

2. The metal fixing material leadthrough of claim 1 , wherein the stainless steel is selected in such a way that, at a mechanical load in the range of 3 N to 4 N, a deflection of at most 0.21 mm occurs.

3. The metal fixing material leadthrough of claim 1 , wherein a mechanical load 0.25% (strain) of the at least one metal pin corresponds to a stress of more than 450 MPa.

4. The metal fixing material leadthrough of claim 1 , wherein a force required for extraction of the at least one metal pin from the fixing material of the through-opening is more than 250 N.

5. The metal fixing material leadthrough of claim 1 , wherein the main body is made of or substantially comprises at least one of a metal, steel, high-grade steel, stainless steel, titanium, a titanium alloy, magnesium, a magnesium alloy, an aluminum alloy, aluminum or AlSiC.

6. The metal fixing material leadthrough of claim 1 , wherein the stainless steel of the at least one metal pin is selected in such a way that a coefficient of thermal expansion α metal pin at a temperature of 650° C. of the at least one metal pin falls in a range of 9×10 −6 1/K to 15×10 −6 /K.

7. The metal fixing material leadthrough of claim 1 , wherein the glass or glass-ceramic fixing material has a coefficient of thermal expansion α glass at a temperature of up to Tg of the fixing material in a range of 4×10 −6 1/K to 10.6×10 −6 1/K.

8. The metal fixing material leadthrough of claim 1 , wherein the main body has a coefficient of thermal expansion α main body , that is at least 2×10 −6 1/K higher than a coefficient of thermal expansion α glass of the fixing material.

9. The metal fixing material leadthrough of claim 1 , wherein the at least one metal pin has at least one bending point.

10. The metal fixing material leadthrough of claim 1 , further comprising at least one further metal pin electrically conductively connected to the main body.

11. The metal fixing material leadthrough of claim 10 , wherein the at least one further metal pin that is electrically conductively connected to the main body has a core region, at least in its core region, is made of a non-stainless steel, and is connected to the main body by a welded joint.

12. The metal fixing material leadthrough of claim 10 , wherein the at least one further metal pin has at least one bending point.

13. The metal fixing material leadthrough of claim 10 , wherein at least one of the at least one metal pin glazed in the through-opening or the at least one further metal pin that is electrically conductively connected with the main body is plated with nickel.

14. The metal fixing material leadthrough of claim 10 , wherein at least one of the at least one metal pin glazed in the through-opening or the at least one further metal pin electrically conductively connected to the main body is plated with gold.

15. A metal fixing material leadthrough for an igniter of at least one of airbags or belt tensioners, the metal fixing material leadthrough comprising:
a main body having a through-opening formed therein and an upper side; and
at least one metal pin fused into a glass or glass-ceramic fixing material in the through-opening and having a core region, the at least one metal pin, at least in its core region, and the main body, at least on its upper side, are made out of stainless steel made to the EN 10020 standard, the stainless steel of the at least one metal pin and of the main body is selected in such a way that the stainless steel of the at least one metal pin and of the main body form a passivation film on its surface, wherein the at least one metal pin and the main body are made of a compatible material combination in such a way that, at least one of when an ignition bridge is installed or when the upper side is covered with a conductive film, at least one of an anode reaction or a cathode reaction does not occur or occurs only to a small extent on the upper side of the main body, wherein a coefficient of thermal expansion α metal pin at a temperature of 650° C. of the at least one metal pin falls in a range of 9×10 −6 1/K to 15×10 −6 l/K.

16. The metal fixing material leadthrough of claim 15 , wherein the fixing material has a thermal expansion coefficient α glass at a temperature of up to Tg of the fixing material in a range of 4×10 −6 l/K to 10.6×10 −6 l/K.

17. The metal fixing material leadthrough of claim 15 , wherein the main body has a coefficient of thermal expansion α main body that is at least 2×10 −6 1/K higher than a coefficient of thermal expansion α glass of the fixing material.

18. The metal fixing material leadthrough of claim 15 , wherein the stainless steel of the at least one metal pin is an alloyed stainless steel according to the EN 10020 standard.

19. The metal fixing material leadthrough of claim 15 , wherein the stainless steel of the at least one metal pin is a chromium alloyed steel or has a chromium equivalent, wherein the chromium equivalent is % Cr+% Mo+1.5×% Si+0.5×% Nb.

20. The metal fixing material leadthrough of claim 15 , wherein the stainless steel has at least a chromium content or a chromium equivalent of between 10% by weight to 30% by weight.

21. The metal fixing material leadthrough of claim 15 , wherein a force required for extraction of the at least one metal pin out of the fixing material of the through-opening amounts to more than 250 N.

22. The metal fixing material leadthrough of claim 15 , wherein the main body is made of or substantially comprises at least one of a metal, steel, high-grade steel, stainless steel, titanium, a titanium alloy, magnesium, a magnesium alloy, an aluminum alloy, aluminum or AlSiC.

23. The metal fixing material leadthrough of claim 15 , wherein the stainless steel is selected so that the at least one metal pin, when converted to a standard dimensioning of a metal pin diameter of 1.00±0.03 mm and a metal pin length of 11.68±0.02 mm, has a maximum elastic deflection W max of at least 0.13 mm.

24. The metal fixing material leadthrough of claim 15 , wherein the at least one metal pin h

Assignees

• Schott Ag

Inventors

• Pfeiffer Thomas
• Hartl Helmut
• Ranftl Reinhard
• Rousek Ondrej
• Nishiwaki Susumu
• Hettler Robert

Classifications

• F42B3/11 Primary

  characterised by the material used, e.g. for initiator case or electric leads (F42B3/107 takes precedence) · CPC title

• F42B3/198

  of electric initiator heads {e.g., testing, machines} · CPC title

• F42B3/107

  Sealing-plugs characterised by the material used · CPC title

• C03C27/02

  by fusing glass directly to metal · CPC title

• B60R2021/26029

  Ignitors · CPC title