Laser brazing for ceramic-to-metal joining
US5407119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1992 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Dec 10, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/406
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The laser brazing of the present invention offers the unique advantage of producing a high temperature hermetic bond while limiting the heat affected zone to the region of the joint. Laser brazing joins infrared (IR) and radio frequency (RF) ceramic materials to metals for radome applications. Using AG--Cu--Ti brazing alloys, zinc sulfide (ZnS) infrared windows were laser brazed to cylindrical titanium housings with no thermal degradation observed in crystalline properties of ZnS. Innovative glass-ceramic materials were also used as braze filler to produce over 30 ceramic-to-metal couples, including titanium Zns, Pyroceram/Kovar and niobium/sapphire. Benefits are in the production of strong, high temperature, hermetically sealed joints in aircraft and high velocity missile systems. An optimized laser brazing system is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.