Preparation method of a butterfly-shaped molybdenum-tungsten bimetal composite rotating target

A bimetallic and rotating target technology, which is applied in the field of refractory metal processing, can solve the problems of high delamination tendency of molybdenum base and tungsten layer, affecting product performance, high density, etc., so as to facilitate long-term work and avoid cracking Effects of delamination and improvement of bonding strength

Active Publication Date: 2022-03-22
JINDUICHENG MOLYBDENUM CO LTD
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Problems solved by technology

At present, there are two problems in the development of this research field: one is how to improve the densification, homogenization and stability of the molybdenum-tungsten composite target structure; the other is how to improve the bonding strength between the molybdenum layer and the tungsten layer while ensuring Under service without cracking
Therefore, although the powder metallurgy method has less material consumption and low production costs, its process is long, and the molybdenum-based and tungsten layers tend to be delaminated during the pressing, sintering and forging processes, and the yield is low.
Products prepared by the above two methods are generally difficult to achieve high density, and more or less contain a certain amount of residual holes, which will seriously affect the performance of the product

Method used

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  • Preparation method of a butterfly-shaped molybdenum-tungsten bimetal composite rotating target

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1. Pre-fill 500g of Mo-W powder into the cavity composed of the cylinder body 1 and the lower mold 2 of the butterfly graphite mold, and use the butterfly-shaped thin PTFE scraper to arrange the surface of the Mo-W powder into a butterfly shape , and then cover the upper mold 5 and carry out pre-pressing under the pressure condition of 15MPa to form the molybdenum-tungsten powder layer 3; the mass content of tungsten in the Mo-W powder is 3%;

[0034] Step 2. Fill 150g of tungsten powder on the molybdenum-tungsten powder layer 3 formed in step 1, and use a butterfly-shaped thin PTFE scraper to arrange the surface of the tungsten powder into a butterfly shape to form a tungsten powder layer 4, and then cover it Die 5 is vacuum hot-pressed and sintered to obtain the crude butterfly-shaped molybdenum-tungsten bimetallic composite rotary target; -2 Pa, temperature 1500°C, pressure 55MPa, time 2h, heating rate 15°C...

Embodiment 2

[0038] This embodiment includes the following steps:

[0039] Step 1. Pre-fill 750g of Mo-W powder into the cavity composed of the cylinder body 1 and the lower mold 2 of the butterfly graphite mold, and use the butterfly-shaped thin PTFE scraper to arrange the surface of the Mo-W powder into a butterfly shape , then cover the upper mold 5 and carry out pre-pressing under the pressure condition of 20MPa to form the molybdenum-tungsten powder layer 3; the mass content of tungsten in the Mo-W powder is 5%;

[0040] Step 2. Fill 250g of tungsten powder on the molybdenum-tungsten powder layer 3 formed in step 1, and use a butterfly-shaped thin PTFE scraper to arrange the surface of the tungsten powder into a butterfly shape to form a tungsten powder layer 4, and then cover it Die 5 is vacuum hot-pressed sintered to obtain the crude butterfly-shaped molybdenum-tungsten bimetallic composite rotary target; the conditions for vacuum hot-pressed sintering are: vacuum degree 1.0×10 -2 ...

Embodiment 3

[0044] This embodiment includes the following steps:

[0045] Step 1. Pre-fill 1000g of Mo-W powder into the cavity composed of the cylinder body 1 and the lower mold 2 of the butterfly graphite mold, and use the butterfly-shaped thin PTFE scraper to arrange the surface of the Mo-W powder into a butterfly shape , and then cover the upper mold 5 to carry out pre-pressing under the pressure condition of 18MPa to form the molybdenum-tungsten powder layer 3; the mass content of tungsten in the Mo-W powder is 10%;

[0046] Step 2: Fill 400g of tungsten powder on the molybdenum-tungsten powder layer 3 formed in step 1, and use a butterfly-shaped thin PTFE scraper to arrange the surface of the tungsten powder into a butterfly shape to form a tungsten powder layer 4, and then cover it Die 5 is vacuum hot-pressed and sintered to obtain the crude butterfly-shaped molybdenum-tungsten bimetallic composite rotary target; -2 Pa, temperature 1700°C, pressure 50MPa, time 4h, heating rate 20°...

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Abstract

The invention discloses a method for preparing a butterfly-shaped molybdenum-tungsten bimetal composite rotating target. The method comprises: 1. Filling Mo-W powder into the cavity formed by the cylinder body and the lower mold of the butterfly-shaped graphite mold, and using the upper mold to pre- Press to form a molybdenum-tungsten powder layer; 2. Fill the molybdenum-tungsten powder layer with tungsten powder to form a tungsten powder layer, and then cover the upper mold for vacuum hot-press sintering to obtain a rough butterfly-shaped molybdenum-tungsten bimetallic composite rotating target; 3. Put the butterfly The rough product of molybdenum-tungsten bimetal composite rotary target is heat treated, and the butterfly-shaped molybdenum-tungsten bimetal composite rotary target is machined. The present invention uses Mo-W powder as the matrix material of the composite rotating target, which effectively improves the bonding strength between the target surface and the matrix in the composite rotating target, avoids the cracking and delamination of the target surface and the matrix during use, and prolongs the life of the composite rotating target. The service life solves the problems of composite pressing delamination, sintering and forging cracking of the molybdenum-tungsten metal composite target, and improves the one-time forming yield of the composite rotary target.

Description

technical field [0001] The invention belongs to the technical field of refractory metal processing, and in particular relates to a method for preparing a butterfly-shaped molybdenum-tungsten bimetal composite rotary target. Background technique [0002] Butterfly-shaped molybdenum-tungsten bimetal composite rotating target is used as the rotating anode in the medical X-ray tube and is the main component of the current medical CT machine. Its diameter is usually 50mm to 250mm. The requirements for the butterfly-shaped molybdenum-tungsten bimetallic composite rotating target are relatively strict, not only requiring high surface dimensional accuracy and high density of the target surface, but also requiring the target surface to have high thermal shock resistance to ensure that the target material can be rotated at high speed. dynamic balance. [0003] The commonly used targets for medical CT machines at home and abroad are molybdenum-based tungsten targets, that is, Mo / W com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02B22F3/14B22F7/02B22F3/24
CPCB22F3/02B22F3/14B22F7/02B22F3/24B22F2998/10B22F2003/248
Inventor 朱琦席莎张菊平王娜安耿武洲何凯崔玉青
Owner JINDUICHENG MOLYBDENUM CO LTD
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