Method for Producing Metallic Microspheres
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
This article relates generally to methods for shaping metals and more particularly to a process for producing metallic microspheres. A process is described by Totta and Sopher, IBM J. Res. Develop., May 1969, pp. 226-238, whereby copper spheres are manufactured for SLT. Commercially obtained copper powder is mixed with alumina powder and remelted in a hydrogen-reducing atmosphere to form spheres. The spheres must then go through a sieving process to select the .005-inch spheres. The tolerance on this process is .0001 inch or 2.0 percent. The following process may be used to produce the copper spheres or other metals to better precision: (1) Two-ounce sheet copper (.0028-inch thick) is laminated to an epoxy (or other non-metallic) substrate. Such structures are commercially available.