DE1907672A1 - Rotating anode for X-ray tubes - Google Patents

Description

Dipl.-Ing. '"; · ..--.

Rudolf Busselmeier - *, .- ■ "" «■■■■ *,", *, '

.. Augsburg, February 13, 1969

Augsburg 3 ■ RehllngeMlreBe β _Λ priority; 3 «April 1968.

Po.tf. A242 1907672 A 3228/68.

PoitMhidikonioi Minchin Nr.Msw Austria

5290/16 Th / Sch

- PATENT APPLICATION

Metallwerk Plansee AG, Reutte / Tyrol,

; Ö STERRlS I-

Rotating anode for X-ray tubes

Ais material for anodes of X-ray tubes I have because of its high density, its high

. Ordinal number in the periodic table and not least because of its high melting point ■ tungsten has proven to be excellent. The good properties of tungsten, for this purpose could by ¹ additions of other hochachmelzenden metals with higher density and high OrdnungSlahlen such as rhenium * osmium, iridium, etc., "partially improved. It has also gefundön that for X-ray tubes with Drehanöden It is by no means necessary to manufacture the anodes entirely from tungsten or a tungsten alloy; it offers

K ₄ , even considerable advantages, for the base body of the (rotating anode a material with a low specific weight; to be used and only at the points of impact

, '(for the electron pads made of tungsten or a-.

'Provide tungsten alloy. - '■ ·.

As a material for the basic body, “I have [] so far, molybdenum has proven its worth. Attempts _t the base _body; made from graphite, initially encountered the difficulty that <! he graphite reacts with the applied ..- tungsten chi eh te κ * whereby brittle intermediate

echichtan; "Ntstahen .. Ss has niiii admitted" that the

8Q3.8i6VQ5iJ4. ; ^ Kyü ·.

529O / I6 Th / Sch - 2 - 13 «February I969 j

Formation of these brittle. Interlayers is greatly retarded when & ± n & ; > Support made of a tungsten-rhenium alloy arranged; net is because the ßhsmlufiSBuaats di · Kayteidbilduag - ) made more difficult »In order to further improve these anodes, according to a proposal that has not yet been published, the instruction was given to create an intermediate ^{layer between the graphite body and the applied tungsten-rhenium alloy» P ch} seconded unalloyed rhenium _e such an intermediate layer would completely suppress the graphite practically ■ in the group consisting of a 'tungsten-rhenium alloy support the diffusion of the Kohlenstoffes'aus. It has now been shown that the arrangement of an intermediate layer made of rhenium on a base body made of graphite is also extremely effective when the support provided at the point of impact for the electrons is not made of a tungsten-rhenium alloy, but of pure tungsten or tungsten alloys that contain, for example, osmium or iridium. These findings form the basis for the present invention,

The invention relates to a rotating anode with a, Base body made of graphite and a support made of tungsten or a tungsten alloy. The invention consists in that between the base body made of graphite and ·.

^% of tungsten or a tungsten alloy because of "; . the support an intermediate layer of rhenium arigsprd -.-.

«Is not. Through this acting as a barrier layer between. layer becomes a diffusion of carbon · ν except for the graphite body in the one made of tungsten or one of: Tungsten alloy existing edition also «then yer-. prevents separating in this rhenium is not contained ...;

For the application of the Rfcenium-Zwiaehansehicht

and the edition containing Wolfraa could actually be ■ '· ■'

5290/16 Th / Sch - 3 - / 13 «February 1969

Known methods such as electrolytic deposition, spraying using a plasma gun or deposition from the gas phase can be used. On hand '• ·· in Au "führungsb * IEPI ·! ·· di · invention will be explained in more detail. The rotating anode shown in the figure consists of a disk-shaped base body (1) made of graphite, on which a thin rhenium layer (2) and a tungsten layer (3) are applied.For the effectiveness of the rhenium intermediate layer is already a strength of a few microns is sufficient so that the consumption of rhenium for the rotary anode according to the invention can be kept small. The tungsten layer must be made somewhat thicker and it should have a minimum thickness of Q ₁ mm. Instead of pure tungsten, alloys of tungsten with other refractory metals, such as osmium or iridium, can also be used. . .

The easiest way to manufacture the rotating anode shown is by depositing the individual Seemed to be made from the gas phase. Fluorides and halides of the to be deposited are suitable for this Metals. One can proceed in such a way that initially by thermal decomposition of a mixture of hydrogen and rhenium-hexafluoride the rhenium-W ^ layer and then from a mixture of hydrogen and tungsten hexafluoride, the tungsten layer from. being divorced. The application of the two layers can be done in a single work process * den, because it must be used in the separation of the various Layers-only changed the gas composition. . will·

'■ - ■■■ / "■. ■■' .. - 4 V 909846/0504.

- Claims

Claims (3)

5290/16 Th / Sch - 4 - February 13, 1969 Claims: 1. Rotating anode for X-ray tubes with a base body made of graphite and a layer made of tungsten or a tungsten alloy, thereby ge ken η ze lean t that between the graphite body'- and the 'tungsten layer of an intermediate layer Rhenium is arranged » 2. Rotating anode for X-ray tubes according to claim "1, characterized in that the support consists of an alloy called osmium or Contains iridium. ' 3. The method for manufacturing a rotary anode according to claims 1, and wherein, ti η 2 geke - "i ze Chne t, that the intermediate layer and the tungsten bearing one operation by deposition from gaseous compounds .In prepared.. 9098 from / 05U4