Low melting temperature silver braze alloy

a technology of braze alloy and low melting temperature, which is applied in the direction of manufacturing tools, electrochemical generators, and solventing apparatus, to achieve the effect of being below the melting point of silver
US20060045791A1Inactive Publication Date: 2006-03-02DELPHI TECH INC
5 Cites 6 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
DELPHI TECH INC
Publication Date
2006-03-02
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A brazing alloy comprising elemental silver alloyed with elemental silicon in a silver / silicon ratio between about 95 / 5 and 99 / 1, preferably about 97 / 3. Small amounts of silicon alloyed with silver depress the alloy liquidus curve significantly, the liquidus temperature of a silver and silicon eutectic alloy being about 837° C. Brazing alloys in accordance with the invention are useful in bonding ceramics to ceramics, ceramics to metals, and metals to metals. Copper, vanadium, or other oxygen-reactive surface bonding elements may also be included. Silver / silicon alloys are useful in applications such as assembly of components of solid oxide fuel cells. A variety of silver / silicon alloy brazes can be used within the same fuel cell so that subsequent brazing can be performed without reliquifying a previous braze. A brazing alloy comprising elemental silver and ruthenium in a silver / ruthenium ratio between 97 / 3 and 99 / 1 is also included.
Need to check novelty before this filing date? Find Prior Art

Description

[0001] This invention was made with United States Government support under Government Contract / Purchase Order No. DE-FC26-02NT41246. The Government has certain rights in this inventionTECHNICAL FIELD

[0002] The present invention relates to alloys for joining materials by brazing; more particularly, to silver-containing braze alloys for joining ceramics to metals; and most particularly, to silver braze alloys containing silicon to lower the liquidus temperature. BACKGROUND OF THE INVENTION

[0003] Fuel cells which generate electric current by controllably combining elemental hydrogen and oxygen are well known. In one form of such a fuel cell, an anodic layer and a cathodic layer are separated by a permeable electrolyte formed of a ceramic solid oxide, such as yttrium-stabilized zirconium (YSZ). Such a fuel cell is known in the art as a “solid oxide fuel cell” (SOFC). A single cell is capable of generating a relatively small voltage and wattage, typically between about 0.5 volt and abo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More