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Attachment of a high-z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target

一种旋转阳极、碳复合的技术，应用在X射线管叠层靶、X射线管电极、X射线管靶材料等方向

Inactive Publication Date: 2011-11-23
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This provides a carbon diffusion barrier

Method used

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  • Attachment of a high-z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target
  • Attachment of a high-z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target
  • Attachment of a high-z focal track layer to a carbon-carbon composite substrate serving as a rotary anode target

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Embodiment Construction

[0050] Hereinafter, a hybrid anode disk structure according to an exemplary embodiment of the present invention will be explained in more detail with reference to the accompanying drawings.

[0051] A schematic cross-sectional view of a conventional rotating anode type X-ray tube as known from the prior art is shown in FIG. 1 . The X-ray tube comprises a stationary cathode C within a vacuum chamber CH given by a glass or metallic glass envelope and a rotatably supported anode target AT fixedly attached to a rotating rod S. When exposed to an electron beam EB with sufficient energy incident on the focal track area on the inclined surface of the anode target, said electrons are ejected from the anode target material due to the high voltage applied between the cathode and said anode, driven by the rotation The anode target AT generates a conical X-ray beam XB and emits the conical X-ray beam XB through the window W of the enclosure CS accommodating the vacuum chamber.

[0052] I...

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Abstract

The present invention refers to hybrid anode disk structures for use in X- ray tubes of the rotary anode type and is concerned more particularly with a novel light weight anode disk structure (RA) which comprises an adhesion promoting protective silicon carbide (SiC) interlayer (SCI) deposited onto a rotary X-ray tube's anode target (AT), wherein the latter may e.g. be made of a carbon-carbon composite substrate (SUB'). Moreover, a manufacturing method for robustly attaching a coating layer (CL) consisting of a high-Z material (e.g. a layer made of a tungsten-rhenium alloy) on the surface of said anode target is provided, whereupon according to said method it may be foreseen to apply a refractory metal overcoating layer (RML), such as given e.g. by a tantalum (Ta), hafnium (Hf), vanadium (V) or rhenium (Re) layer, to the silicon carbide interlayer (SCI) prior to the deposition of the tungsten-rhenium alloy. The invention thus leverages the tendency for cracking of the silicon carbide coated carbon composite substrate (SUB') during thermal cycling and enhances adhesion of the silicon carbide / refractory metal interlayers to the carbon-carbon composite substrate (SUB') and focal track coating layer (CL) by an interlocking mechanism. Key aspects of the proposed invention are: a) controlled formation of coating cracks (SC) in the silicon carbide layer (SCI) and b) conformal filling of SiC crack openings with a refractory metal.

Description

technical field [0001] The present invention relates to hybrid anode disk structures for use in rotating anode type X-ray tubes and, more particularly, to novel lightweight anode disk structures comprising an anode target deposited on a rotating X-ray tube Adhesion promotion on a protective silicon carbide interlayer, wherein the anode target can be made, for example, from a carbon-carbon composite substrate. Furthermore, a manufacturing method is provided for robustly attaching a coating comprising a high-Z material, for example a layer made of tungsten-rhenium alloy, onto the surface of said anode target, whereby, according to said method, it is possible It is foreseen that an overcoat of refractory metal, eg imparted by a layer of tantalum, hafnium, vanadium or rhenium, is applied to the silicon carbide interlayer prior to the deposition of the tungsten-rhenium alloy. Thus, the present invention takes advantage of the tendency of SiC-coated carbon composite substrates to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J35/10
CPCH01J35/108H01J2235/088H01J2235/084H01J2235/081H01J2235/085
Inventor M·D·德罗利
Owner KONINK PHILIPS ELECTRONICS NV
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