Rotary anode target for X-ray tube, preparation method and target assembly

Abstract

The invention provides a rotary anode target for an X-ray tube, a preparation method and a target assembly. The anode target comprises a target disc and an annular cover. The target disc comprises a substrate and a target surface layer covering the substrate. A first center hole is formed in the center of the substrate. A second center hole is formed in the center of the target surface layer. Theannular cover covers the inner circumferential side wall of the first center hole and is connected with the substrate, and the annular cover is used for reducing or blocking the diffusion of the heatemitted by the substrate. The rotary anode target can reduce the heat transmitted to a rotating shaft or a bearing in a heat radiation mode, obviously reduces the temperature of a metal ball, and prolongs the service lives of the bearing and the X-ray tube. Moreover, the power continuously loaded by the X-ray tube is higher, and more patients can be scanned in unit time.

Description

Technical field [0001] The invention relates to the technical field of preparing components for high-performance medical devices, and in particular to a rotating anode target for X-ray tubes, a preparation method and a target assembly. Background technique [0002] X-ray tubes are used to generate X-rays and play an important role in various fields such as medical diagnosis, safety inspection and non-destructive testing. The basic principle of the X-ray tube is that the hot electrons excited by the heating of the cathode filament hit the target disk under the action of the cathode and anode accelerating electric fields. 1% of the energy is converted into X-rays, and the remaining 99% of the energy is converted into heat energy. , causing the temperature of the impacted area to rise rapidly. In the fixed anode X-ray tube, electrons continue to hit the same position, causing the local temperature of the fixed anode X-ray tube to rise rapidly. Although it can be continuously l...

AI Technical Summary

Problems solved by technology

At the same time, part of the heat is inevitably transferred to the anode bearing through heat conduction and heat radiation, which makes the temperature of the metal ball rise.

If the heat transferred by heat conduction or heat radiation is too much, it will cause the metal ball to exceed the limit operating temperature, which will cause the bearing to be stuck, resulting in the failure of the entire X-ray tube

[0003] The traditional rotating anode X-ray tube reduces heat conduction by reducing the wall thickness of the shaft connecting the target disk and the bearing, but ignores the thermal radiation of the graphite target disk to the shaft or bearing

The thermal radiation coefficient of the graphite on the target plate is 0.7-0.9, and the temperature of the graphite in the working state is about 1200°C, so a large amount of heat is transferred to the shaft and the bearing in the form of thermal radiation, which eventually leads to an increase in the temperature of the metal balls, affecting The life of the bearing affects the life of the entire X-ray tube, and also limits the continuous loading power of the entire X-ray tube

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