Laser brazing for ceramic-to-metal joining
Patent 5407119 Issued on April 18, 1995. Estimated Expiration Date: 
December 10, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 10, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3113878 3217088 Pressurized heat treatment of glass-ceramic to control thermal expansion Method for attaching a diamond component to metal Method of bonding a ceramic article to a metal article Fiber optic laser joining apparatus Transparent pressure foot Antenna lamination technique Patent #: 4983237 InventorsAssigneeApplicationNo. 988876 filed on 12/10/1992US Classes:228/124.5, Active or reactive filler component65/59.22, Named fusible bonding material employed65/59.5, Glass applied in powdered (i.e., frit) form219/121.64, Methods228/232, Including preheating228/262.2Nonmetal work component without metallic fillerExaminersPrimary: Bradley, P. AustinAssistant: Knapp, Jeffrey T. Attorney, Agent or FirmForeign Patent References
International ClassesB23K 026/00B23K 001/005 AbstractThe 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. | |
