Claims
- 1. A powder admixture of 97.75% minus 325 mesh atomized powder mixed with 2.25% minus 325 mesh titanium hydride powder, the atomized powder having the following composition, in weight percent: 94.12 Cu; 3.07 Al; 2.81 Si.
Parent Case Info
This application is a division of application Ser. No. 07/420,416, filed 10/12/89.
This invention concerns a ternary brazing alloy of copper, silicon and titanium for brazing ceramics. Such a ternary alloy is disclosed in U.S. Pat. No. 4,426,033 and European Patent Application No. 0 038 584. U.S. Pat. No. 4,426,003 discloses a ternary alloy containing 50 to 98.75% by weight of copper, 0.25 to 5% titanium, and from about 1% to about 45% of a third metal selected from the group consisting of silicon, tin, germanium, manganese, nickel and cobalt. EP application No. 0 038 584 discloses a ternary brazing alloy containing 40 to 85 atomic % copper, 5 to 60 atomic % titanium, 0 to 55 atomic % silicon.
A problem with the ternary brazing alloys disclosed in the above references is the formation of oxidation product on the braze fillet area during the direct brazing of ceramic to metal.
I have found that if a controlled amount of aluminum is added to a copper, silicon, titanium brazing alloy of controlled composition, that the formation of oxidation product can be prevented or greatly minimized. A brazing alloy as per this invention has a composition of, in weight percent, 1 to 4 silicon, 1 to 5 titanium, 0.5 to 6 aluminum, 89 to 96 copper.
In the following examples, all compositions are expressed in weight percent.
US Referenced Citations (1)
| Number |
Name |
Date |
Kind |
|
4897243 |
Mizuhara |
Jan 1990 |
|
Divisions (1)
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Number |
Date |
Country |
| Parent |
420416 |
Oct 1989 |
|
Patent Grant
4983213
