A kind of preparation method of molybdenum-rhenium alloy barrel

A technology of molybdenum-rhenium alloy and tube parts, which is applied in the field of preparation of molybdenum-rhenium alloy tube parts, can solve the problems of cracking, sintering deformation, material waste, etc., achieve high mechanical properties, high density and mechanical properties, and solve the problems of difficult preparation Effect

Active Publication Date: 2022-03-08
安泰天龙钨钼科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the applicant's experiments, sintering to prepare thin-walled molybdenum-rhenium alloy cylinders faces the problem of difficulty in compacting, and at the same time, it is prone to cracking, sintering deformation and other phenomena. At present, it can only be sintered with a wall thickness of more than 20mm, and it needs to be processed to a wall thickness of less than 5mm. Large-scale molybdenum-rhenium cylinders have serious material waste problems

Method used

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  • A kind of preparation method of molybdenum-rhenium alloy barrel
  • A kind of preparation method of molybdenum-rhenium alloy barrel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Alloy powder preparation: According to the Mo:Re ratio of 95:5, put 9500g of molybdenum powder and 500g of rhenium powder into a three-dimensional mixer for mixing to obtain MoRe5 alloy powder. The speed of the mixer is 30r / min, and the mixing time is 4h; wherein, the Fischer particle size of the molybdenum powder is 3.0 μm, and the purity is 99.95%; the particle size of the rhenium powder is -250 mesh, and the purity is 99.99%.

[0040] (2) Compression molding: put 10Kg of molybdenum-rhenium alloy powder obtained in step (1) into a mold, hold the pressure for 15 minutes under a pressure of 150MPa to obtain a plate-shaped compact with a relative density of 70%.

[0041] (3) High-temperature sintering: Put the green compact in step (2) into an intermediate frequency high-temperature hydrogen sintering furnace for sintering. The maximum sintering temperature is 2100°C, and the maximum temperature is kept for 6 hours to obtain a sintering with a relative density of 93% ...

Embodiment 2

[0049] (1) Alloy powder preparation: according to the ratio of Mo:Re 86:14, put 8.6Kg of molybdenum powder and 1.4Kg of rhenium powder into a three-dimensional mixer for mixing to obtain MoRe14 alloy powder, the speed of the mixer is 40r / min, mix The feeding time is 5 hours; wherein, the Fischer particle size of the molybdenum powder is 3.4 μm, and the purity is 99.95%; the particle size of the rhenium powder is -350 mesh, and the purity is 99.99%.

[0050] (2) Compression molding: put 10Kg of the molybdenum-rhenium alloy powder obtained in step (1) into a mold, hold the pressure for 5 minutes under a pressure of 200 MPa to obtain a plate-shaped green compact with a relative relative density of 75%.

[0051] (3) High-temperature sintering: Put the green compact in step (2) into an intermediate frequency high-temperature hydrogen sintering furnace for sintering. The maximum sintering temperature is 2200 ° C, and the maximum temperature is kept for 5 hours to obtain a sintering w...

Embodiment 3

[0059] (1) Alloy powder preparation: according to the ratio of Mo:Re 65:35, put 5.2Kg of molybdenum powder and 2.8Kg rhenium powder into a three-dimensional mixer for mixing to obtain MoRe35 alloy powder, the speed of the mixer is 30r / min, and mix The feeding time is 8 hours; wherein, the Fischer particle size of the molybdenum powder is 3.2 μm, and the purity is 99.95%; the particle size of the rhenium powder is -200 mesh, and the purity is 99.99%.

[0060] (2) Compression molding: put 8Kg of the molybdenum-rhenium alloy powder obtained in step (1) into a mold, hold the pressure for 10 minutes under a pressure of 200 MPa to obtain a plate-shaped compact with a relative density of 65%.

[0061] (3) High-temperature sintering: Put the green compact in step (2) into an intermediate frequency high-temperature hydrogen sintering furnace for sintering. The maximum sintering temperature is 2200°C, and the temperature is kept at the highest temperature for 6 hours to obtain a sinterin...

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Abstract

The invention relates to a method for preparing a molybdenum-rhenium alloy cylinder. The method sequentially comprises: the preparation step of molybdenum-rhenium alloy powder: uniformly mixing molybdenum powder and rhenium powder to obtain molybdenum-rhenium alloy powder; loading the molybdenum-rhenium alloy powder into a pressing mold, performing pressing molding treatment, and obtaining a compact; Sintering the compact to obtain a sintered slab; rolling the sintered slab to obtain a molybdenum-rhenium rolled plate; annealing the molybdenum-rhenium rolled plate; The processing is trimmed and bent into shape; the billets obtained through the machining steps are butt-welded to obtain a complete molybdenum-rhenium alloy cylinder. The method can be used to prepare round and / or polygonal molybdenum-rhenium alloy cylinders in a targeted manner according to the requirements of different components and different pipe sizes. The prepared molybdenum-rhenium alloy cylinders have good comprehensive mechanical properties and can meet different requirements. industry requirements.

Description

technical field [0001] The invention belongs to the field of rare refractory metals, and in particular relates to a method for preparing a molybdenum-rhenium alloy cylinder. Background technique [0002] Molybdenum-rhenium alloys have high mechanical properties at high temperatures, good ductility at room temperature, and good compatibility with fuels and coolants commonly used in nuclear fast reactors. As a key structural material, they are used in aerospace, It has been widely used in medical, national defense and electronic industries. Large-diameter molybdenum-rhenium cylinders can be used as cladding tubes for nuclear power facility pipelines. In order to facilitate the placement of some components, the inner wall of the cylinder part needs to be flat, which poses a challenge to the preparation of large-diameter molybdenum-rhenium cylinders. [0003] In the prior art, there are relatively few disclosures about the preparation process of molybdenum-rhenium alloy pipes. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/04B22F3/10B22F3/18B22F3/24C22C27/04B23P15/00
CPCB22F3/04B22F3/1007B22F3/18B22F3/24C22C27/04B23P15/00B22F2003/185B22F2003/248B22F2998/10
Inventor 王广达陈福鸽杨亚杰
Owner 安泰天龙钨钼科技有限公司
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