BRAZING MATERIAL FOR BONDING IN ATMOSPHERE, BONDED ARTICLE, AND CURRENT COLLECTING MATERIAL

• US 20130260285A1
• Filed: 12/01/2011
• Published: 10/03/2013
• Est. Priority Date: 12/09/2010
• Status: Abandoned Application

• Current Assignee: NHK Spring Company Limited
• Original Assignee: NHK Spring Company Limited
• Inventors: Yamauchi, Yuichiro, Saito, Shinji
• Application Number:
  US13/991,504
• Publication Number:
  US 20130260285A1
• Time in Patent Office: Days
• US Class Current: 429/520
• CPC Class Codes: B23K 2101/36 Electric or electronic devices
• CPC Class Codes: B23K 2103/04 Steel or steel alloys
• CPC Class Codes: B23K 2103/05 Stainless steel
• CPC Class Codes: B23K 2103/16 Composite materials , e.g. fibre reinforced
• CPC Class Codes: B23K 2103/18 Dissimilar materials
• CPC Class Codes: B23K 2103/26 Alloys of Nickel and Cobalt and Chromium
• CPC Class Codes: B23K 2103/52 Ceramics
• CPC Class Codes: B23K 35/00 Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
• CPC Class Codes: B23K 35/28 with the principal constituent melting at less than 950 degrees C
• CPC Class Codes: B23K 35/30 with the principal constituent melting at less than 1550 degrees C
• CPC Class Codes: B23K 35/3006 Ag as the principal constituent
• CPC Class Codes: C04B 2237/125 based on noble metals, e.g. silver
• CPC Class Codes: C04B 2237/34 Oxidic
• CPC Class Codes: C04B 2237/341 Silica or silicates
• CPC Class Codes: C04B 2237/343 Alumina or aluminates
• CPC Class Codes: C04B 2237/348 Zirconia, hafnia, zirconates or hafnates
• CPC Class Codes: C04B 2237/368 Silicon nitride
• CPC Class Codes: C04B 2237/406 Iron, e.g. steel
• CPC Class Codes: C04B 37/026 consisting of metals or metal salts
• CPC Class Codes: C22C 30/00 Alloys containing less than 50% by weight of each constituent
• CPC Class Codes: C22C 5/06 : Alloys based on silver
• CPC Class Codes: H01M 2008/1293 : Fuel cells with solid oxide electrolytes
• CPC Class Codes: H01M 8/0202 : Collectors; Separators, e.g. bipolar separators; Interconnectors
• CPC Class Codes: H01M 8/0215 : Glass; Ceramic materials
• CPC Class Codes: H01M 8/0228 : in the form of layered or coated products
• CPC Class Codes: H01M 8/0271 : Sealing or supporting means around electrodes, matrices or membranes
• CPC Class Codes: H01M 8/0297 : Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other H01M8/0271 takes precedence
• CPC Class Codes: Y02E 60/50 : Fuel cells

Abstract

A brazing alloy for bonding in air contains Ag, B, and Si, as essential components, in which the total of constituent elements except for Ag is set to more than 50% by volume and not more than 90% by volume, Si content in the constituent elements except for Ag is set to more than 22% by volume, and B content in the constituent elements except for Ag is set to more than 14% by volume. In a bonded layer of a bonded specimen of the present invention, after holding at high temperature, no void as observed in a bonded specimen after holding at high temperature of a Comparative Sample is observed, the brazing alloy is sufficiently melted, and superior gas sealing characteristics are maintained even after holding at high temperature for a long time.

Claims

1. A brazing alloy for bonding in air, comprising Ag, B, and Si, as essential components,

wherein the total of constituent elements except for Ag is set to more than 50% by volume and not more than 90% by volume,

Si content in the constituent elements except for Ag is set to more than 22% by volume, and

B content in the constituent elements except for Ag is set to more than 14% by volume.

2. The brazing alloy for bonding in air according to claim 1, wherein at least one kind selected from the group consisting of Ge, Cr, Al, Ti, Zr, and Hf is further added as an additional component, and the additional component content in the constituent elements except for Ag is set to less than 64% by volume.

3. The brazing alloy for bonding in air according to claim 1, wherein when the brazing alloy is used for bonding of members, an oxide containing at least one kind of the constituent elements is formed in brazing.

4. The brazing alloy for bonding in air according to claim 1, wherein when the brazing alloy is used for bonding of members, a complex oxide containing at least two kinds of the constituent elements is formed in brazing.

5. The brazing alloy for bonding in air according to claim 1, wherein the brazing alloy has a melting point of not less than 650°

C. and not more than 850°

C. in air.

6. A bonded article formed of a set of a metal member and a metal member, a set of a ceramic member and a ceramic member, or a set of a metal member and a ceramic member, which are bonded with the brazing alloy recited in claim 1, and the bonded article having gas sealing characteristics.

7. The bonded article according to claim 6, wherein the bonded article is used in a fuel cell or in a solid oxide fuel cell.

8. A current collecting material formed of a set of a metal member and a metal member, a set of a ceramic member and a ceramic member, or a set of a metal member and a ceramic member, which are bonded with the brazing alloy recited in claim 1, and the current collecting material having electrical conductivity.

9. The current collecting material according to claim 8, wherein the current collecting material is used in a fuel cell or in a solid oxide fuel cell.