Tungsten-rhenium-molybdenum alloy rotary anode target material for X-ray tube and preparation method thereof

Abstract

The invention relates to a tungsten-rhenium-molybdenum alloy rotary anode target material for an X-ray tube and a preparation method thereof, wherein the target material relates to the technical field of powder metallurgy. The tungsten-rhenium-molybdenum alloy rotary anode target material for the X-ray tube comprises a tungsten-rhenium alloy layer and a molybdenum alloy layer. Tungsten-rhenium pre-alloy powder and molybdenum alloy powder are used as raw materials. The tungsten-rhenium-molybdenum alloy rotary anode target material is prepared through the steps of a compression molding step, a high-temperature sintering step, a hot isostatic pressing step, a straightening shaping step and a machining step, wherein the compression molding step, the high-temperature sintering step, the hot isostatic pressing step, the straightening shaping step and the machining step are successively performed. The tungsten-rhenium-molybdenum alloy prepared by the invention has excellent performances of small crystal grain, uniform tissue, relatively low impurity element content, high compactness, high strength, etc. The rotary anode target prepared by the tungsten-rhenium-molybdenum alloy for the X-ray tube has advantages of high product qualified rate, high heat dissipation performance, high heat impact resistance, long service life, etc.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a tungsten-rhenium-molybdenum alloy rotating anode target material for an X-ray tube and a preparation method thereof. Background technique [0002] The X-ray tube is the core of all X-ray instruments. The performance of the X-ray instrument depends largely on the quality of the X-ray tube; the anode target is an important part of the X-ray tube, which directly affects the X-ray emission intensity and pipe life. [0003] With the development of X-ray detection technology, rotating target X-ray tubes with large heat capacity and strong X-ray output are widely used in the field of medical diagnosis in order to withstand continuous load or instantaneous high load input. When modern X-ray tubes with strong power output are working, they apply a high voltage of up to 200KV to the electrons escaping from the incandescent filament. Under the action of high voltage, the escaped...

AI Technical Summary

Problems solved by technology

[0005] According to the introduction of "Rare Metals and Cemented Carbide" 1987 Z1 Issue "Overview of Rotating Anode Targets for X-ray Tubes Abroad", there are three main processes for producing target discs: one is powder metallurgy, that is, in metal molds, according to According to the shape and requirements of the designed target, various powders are filled in layers, and then pressed and sintered by a certain process; this method has a simple process, but the sintered density is low

The second production process is to use powder metallurgy to prepare tungsten-rhenium-molybdenum alloy sintered blanks. After 3-4 times of forging, the product is prepared by mechanical processing. This process has many forging passes, and the local area of ​​the product is prone to stress. Concentration causes cracks, so the efficiency is low and the cost is high

The third production process is the process of vapor deposition of tungsten-rhenium alloy on the molybdenum alloy substrate. The disadvantage of this process is that the density of the tungsten-rhenium layer is low, and the bonding strength with the molybdenum alloy substrate is low. When used at high temperature, Cracks are prone to occur, resulting in a short life of the X-ray tube, and this process is also likely to pollute the environment

[0006] Publication No. CN1093828A patent "Manufacturing method of disc-shaped molybdenum-based tungsten target" adopts powder metallurgy method and forging method to prepare molybdenum-based tungsten target. Practice has proved that this process has many forging passes, and local areas of the product are prone to stress concentration and cracks , so the efficiency is low and the cost is high

The patent of publication number CN101290852A "Preparation method of WMo graphite composite target for high-power X-ray tube" also provides a way of thinking for the preparation of WMo target, that is, by laminating WMo powder in graphite mold and then hot pressing and sintering However, the test proves that the gas impurity content of the target plate prepared by this method is relatively high, and there are staggered tungsten and molybdenum materials at the interface of the tungsten and molybdenum layers.

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