Inventors:
David S. Lee - Salt Lake City UT
Assignee:
Varian Medical Systems, Inc. - Palo Alto CA
International Classification:
H01J 3510
Abstract:
The present invention is directed to an x-ray tube, and method of manufacture thereof, having an improved rotary anode target structure. The anode target is constructed of carbon-carbon composite material. A focal track is formed on the surface of the anode target, and is comprised of a metallic material that is capable of generating x-rays when contacted with a high velocity electron stream. The surface of the carbon-carbon composite anode is treated in a manner so as to provide an enhanced bond between the composite and the focal track material, and which diffuses any interfacial stresses that occur between the track layer and the composite substrate during thermal expansion of the two materials, which may differ significantly. In particular, the bond interface is formed by microscopically roughening the surface of the substrate, so as to provide a âsaw-toothâ-like, or jagged, surface configuration. This provides a high surface contact area per unit length between the composite and the focal track material, thereby diffusing any stresses resulting from thermal expansion of the two materials.