# US 4,394,953 A · Method of joining individual parts of an X-ray anode, in particular of a rotating anode

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- Number: US 4,394,953 A
- Document ID: US4394953A
- Status: Granted
- Kind: A
- Application number: 06/247,539
- Filed: 1981-03-12
- Granted: 1983-07-26
- Earliest claimed: 1981-03-12
- Assignees: Schwarzkopf Development Corporation
- Inventors: Alfred Sonnweber; Hubert Bildstein; Lambert Egger
- Web page: https://patentgrep.com/patent/US4394953A

## CPC

- H01J 35/108: {Substrates for and bonding of emissive target, e.g. composite structures}
- B23K 1/20: Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

In the manufacture of rotating anodes for X-ray tubes consisting of a basic body made of high-melting metal or its alloys and one or a plurality of graphite parts, the graphite parts (3) are provided with grooves (5) and boreholes (6) before the individual parts are joined by soldering. The grooves (5) mainly having a semicircular cross section are provided in the surface (4) of the graphite parts (3) to be joined by soldering. The boreholes (6) extend through the graphite parts (3) and feed into the grooves (5) approximately vertical to the graphite surface (4). Excessive solder and gases formed during soldering may flow or escape by way of the grooves and boreholes, which produces an improved soldered joint with increased adhesive or bonding strength between the basic body and the graphite parts.

## Claims

### Claim 1

A method for joining individual parts of an X-ray anode, in particular of a rotating anode, comprising providing a metal part composed of a high-melting metal or an alloy thereof and at least one graphite part having a graphite surface provided with grooves which are non-intersecting with the edges of said graphite surface, and said graphite part being provided with a plurality of approximately vertical boreholes extending through said graphite part towards said graphite surface and opening into said grooves, soldering the metal part to the graphite surface of said graphite part and removing excessive solder and gases formed during said soldering through said grooves and said boreholes.

### Claim 2 (depends on 1)

A method according to claim 1 wherein the grooves are semicircular in cross section.