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

An X-ray tube and anode target material technology, which is applied in the field of powder metallurgy, can solve the problems of tungsten-rhenium alloy uniformity, coarse crystallization of the molybdenum alloy layer matrix, and high gas impurity content of the target plate, so as to reduce equipment investment and grain size. The effect of small and uniform structure and high qualified rate of finished products

Inactive Publication Date: 2018-12-11
ZHUZHOU JIABANG REFRACTORY METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, some molybdenum-based tungsten targets are prepared by powder metallurgy and forging methods. Practice has proved that rhenium is not added to the tungsten target surface, and cracks are easy to occur on the target surface during use, and the service life is short.
In addition, the use of forging is easy to cause local stress concentration, resulting in cracking
Some existing technologies are prepared by laminating W / Mo powder in a graphite mold and then hot-pressing and sintering, but tests have proved that the target disk prepared by this method has a high content of gas impurities, and the interface between the tungsten and molybdenum layers has tungsten, molybdenum, and molybdenum. Material canines appear
There is also an existing technology that prepares molybdenum-based tungsten-rhenium targets by adding rhenium and hot isostatic pressing, but practice has proved that the uniformity of the tungsten-rhenium alloy in this method needs to be improved, and the cost of hot isostatic pressing is high and the molybdenum alloy layer matrix All crystals are coarse

Method used

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

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preparation example Construction

[0027] A method for preparing a tungsten-rhenium-molybdenum alloy layer composite anode target for an X-ray tube, the specific steps comprising:

[0028] Step 1. Preparation of tungsten-rhenium pre-alloy powder to be reduced (mixing of tungsten-rhenium pre-alloy powder): Weigh tungsten powder and ammonium rhenate respectively according to a predetermined ratio, ammonium rhenate is made into ammonium rhenate solution, put tungsten powder into In the ammonium rhenate solution, the tungsten-rhenium pre-alloy powder to be reduced is obtained through stirring and heating and evaporating to dryness;

[0029] Step 2, reduction of tungsten-rhenium pre-alloyed powder: put the tungsten-rhenium pre-alloyed powder to be reduced into a reduction furnace for secondary reduction to obtain tungsten-rhenium pre-alloyed powder (ie: tungsten-rhenium pre-alloyed powder);

[0030] Step 3, compression molding: according to a predetermined ratio, the pre-prepared molybdenum alloy powder and the tung...

Embodiment 1

[0044] (1) Preparation of tungsten-rhenium pre-alloyed powder to be reduced: 12.9 kg of tungsten powder with a Fisher particle size of 1.7 μm and a purity of 99.95% and 575 g of ammonium rhenate powder with a purity of 99.99% were weighed. Pour ammonium rhenate powder into a heating and stirring pot filled with water to obtain a colorless transparent ammonium rhenate solution, and then pour tungsten powder into the ammonium rhenate solution. Then stir and heat, the stirring speed is 25r / min, and the stirring and heating time is 2 hours.

[0045] (2) Reduction of tungsten-rhenium pre-alloyed powder: put the mixed tungsten-rhenium pre-alloyed powder into a boat for hydrogen reduction treatment, first push the boat into a low-temperature zone for treatment, that is, the powder reacts at 320°C for 40 minutes , the hydrogen flow rate is 8L / h; then the boat is pushed into the high temperature zone for processing, that is, the powder is reacted at 650°C for 60min, and the hydrogen fl...

Embodiment 2

[0053] (1) Preparation of tungsten-rhenium pre-alloyed powder to be reduced: 12.95 kg of tungsten powder with a Fischer particle size of 2.4 μm and a purity of 99.95% and 190 g of ammonium rhenate powder with a purity of 99.99% were weighed. Pour ammonium rhenate powder into a heating and stirring pot filled with water to obtain a colorless transparent ammonium rhenate solution, and then pour tungsten powder into the ammonium rhenate solution. Then stir and heat, the stirring speed is 20r / min, and the stirring and heating time is 1.5 hours.

[0054] (2) Reduction of tungsten-rhenium pre-alloy powder: put the mixed tungsten-rhenium pre-alloy powder into a boat for hydrogen reduction treatment, first push the boat into the low temperature zone for treatment, that is, the powder reacts at 360°C for 30 minutes , the hydrogen flow rate is 6L / h; then the boat is pushed into the high temperature zone for processing, that is, the powder is reacted at 720°C for 40min, and the hydrogen ...

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Abstract

The invention discloses a tungsten-rhenium-molybdenum alloy layer composite anode target material for an X-ray tube and a preparation method thereof. The target material comprises a tungsten-rhenium alloy layer and a molybdenum alloy layer. Tungsten-rhenium pre-alloy powder is prepared by a mode of mixing tungsten powder and ammonium rhenate solution and reducing after evaporating. In the tungsten-rhenium pre-alloy powder, a mass percentage of rhenium is 1-5%, and the balance is tungsten. The target material is prepared by using the tungsten powder, ammonium rhenate and molybdenum alloy powderas raw materials, through pre-alloying, compression-molding, sintering in intermediate frequency, shaping in high temperature, and machining successively. Prepared high-activity tungsten-rhenium pre-alloy coated powder in a special matching ratio is more uniform in composition, and higher in activity. The prepared tungsten-rhenium-molybdenum alloy layer composite anode target material is uniformin composition, fine and uniform in grain structure, high in finished product pass percent, less in working procedure, and low in cost.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy. Background technique [0002] The ray tube is the core of all X-ray equipment, and the anode target is the core component of the X-ray tube, which directly affects the X-ray emission intensity and the service life of the tube. When the X-ray tube is working, a high voltage is applied to the cathode to generate electron beams. The escaped electrons bombard the anode target surface at high speed, and the anode target generates X-rays after being bombarded. Since only about 1% of the energy is converted into X-ray energy during electron bombardment, the remaining energy is all converted into heat energy, which makes the temperature of the target rise sharply to above 1300°C. After the electron bombardment is over, the anode target quickly dissipates heat by rotating. Under the alternating effect of rapid cooling and rapid heating, extremely high requirements are put forward for the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/34B22F3/10B22F5/00
CPCB22F3/1007B22F5/00B22F2998/10B22F2999/00C23C14/3414B22F9/22B22F3/02B22F3/24B22F2201/013
Inventor 邹远振段明周文强王诗才
Owner ZHUZHOU JIABANG REFRACTORY METAL
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