DE1233499B - Rotating anode for X-ray tubes - Google Patents

Description

GERMAN # | # PATENT OFFICE EDITORIAL

German class: 21g-17/10

Number: 1233 499

File number: M 62012 VIII c / 21 g

1233 499 Filing date: August 6, 1964

Opened on: February 2, 1967

The invention relates to a rotating anode for X-ray tubes, consisting of a disk-shaped one Base body made of a molybdenum alloy, on which one made of tungsten on the electron impact side or a tungsten-rhenium alloy layer is applied.

As a material for anodes for X-ray tubes, tungsten has proven itself very well because of its high melting point and its high atomic number in the periodic system of the elements. In order to keep the need for tungsten for X-ray anodes as small as possible and to facilitate their shaping, thought has already been given to producing the base bodies for the rotating anodes essentially from molybdenum and to providing them with a tungsten layer only on the side where the electrons hit. Known anodes of this type are also distinguished by a relatively low weight compared to anodes made entirely of tungsten. ao

It is already well known that the base body made of tungsten-molybdenum alloys to manufacture.

It is an object of the present invention to further improve these known anodes.

This object is achieved in that, according to the invention, the alloy of the base body Tungsten with a proportion of 0.5 to 50% or one of the metals tantalum, niobium, rhenium or Contains osmium.

The effects achieved by the addition of such refractory metals go far beyond beyond what one would expect with an additive effect of the alloy addition.

Additions of just 0.5% tungsten increase the heat resistance, the recrystallization temperature and delay grain growth.

When the addition of tungsten is increased, the additional effect is achieved that the differences the thermal expansion between the molybdenum base body and the tungsten layer is reduced will. This also reduces the risk that the anodes will become in operation as a result deform occurring heating. Additions of 2 to 10% tungsten have proven effective in practice. However, it has been shown that even higher additions of up to 50% are justified economically appear when comparing them with unalloyed molybdenum bodies.

In addition to the addition of refractory metals, other additives can of course also be used for X-ray tubes

Applicant:

Metallwerk Plansee Aktiengesellschaft,
Reutte, Tyrol (Austria)

Representative:

Dipl.-Ing. R. Busselmeier, patent attorney,
Augsburg, Grottenau 2

Named as inventor:
Bernd Natter,

Dr. Karl Sedlatschek, Reutte, Tyrol (Austria)

Claimed priority:

Austria from September 2, 1963 (A 7038/63)

be mixed, e.g. B. small amounts of alkali silicates or stable oxides to further increase the To reach recrystallization temperature.

Known methods can be used to produce the X-ray anodes designed according to the invention will. For example, the molybdenum part alloyed with tungsten and the tungsten layer can be used Manufacture separately using a powder metallurgical process, then through these parts Form forges combine and at the same time give them their final shape. But you can also do that entire anode initially made of powders of the appropriate composition (and possibly in corresponding layering of these powders), then sintering and using suitable shaping processes, z. B. rolling, punching, forging, etc., bring them to their final shape.

Claims (1)

Patent claims: 1. Rotating anode for X-ray tubes, consisting of a disk-shaped base body a molybdenum alloy with a tungsten or a Tungsten-rhenium alloy existing layer 709 507/301