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A hot isostatic pressing diffusion bonding method for tungsten/steel cylindrical structural parts

A technology of hot isostatic pressure diffusion and connection method, used in welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve the problems of difficult surface treatment of cylindrical structures, large residual stress of welded joints, and easy generation of intermetallic compounds. , to achieve the effect of high sphericity, high production efficiency and good fluidity

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing tungsten / steel diffusion connection has the problems of large residual stress in the welded joint and the formation of hard and brittle phases such as intermetallic compounds at the interface. To obtain a tungsten / steel bimetal structure with good interface bonding performance, it is necessary to add intermediate connection materials, such as metal foil
However, to prepare tungsten / steel cylindrical structural parts, metal cylindrical foils are required as intermediate connecting materials. Traditional strips, strips, and sheet metal foils cannot achieve good lap joints between intermediate connecting materials and tight fit of the cylindrical parts to be welded, which is prone to Welding defects such as porosity and lack of welding
In addition, there are processing and assembly difficulties in the hot isostatic pressure diffusion connection of tungsten / steel cylinder structure with added metal foil, especially the high requirements for the surface finish of tungsten, and due to the inherent brittleness of tungsten and the difficulty of surface treatment of the cylinder structure. large, which limits its application

Method used

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  • A hot isostatic pressing diffusion bonding method for tungsten/steel cylindrical structural parts
  • A hot isostatic pressing diffusion bonding method for tungsten/steel cylindrical structural parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The tungsten cylinder is made of pure tungsten, and the steel cylinder is made of 316L stainless steel. The nickel-based alloy powder is prepared by plasma rotating electrode atomization powder technology. The obtained powder is sieved through a 300-mesh screen to obtain the powder intermediate connecting material. The powder composition is calculated by mass percentage: 70% nickel, 20% iron, 8% copper , 2% cobalt.

[0055] Place the tungsten cylinder and the steel cylinder on a milling machine for surface processing to make the surface roughness 1.6μm, and then immerse them in a nitric acid solution with a concentration of 50% for 20 minutes to obtain a combination of tungsten and steel To be welded.

[0056] Place the welded parts of tungsten and steel according to the laminated structure of tungsten lining / steel jacket (the distance between the two is 5 mm), and then lay the powder intermediate connecting material between the welded parts of tungsten and steel, and the l...

Embodiment 2

[0061] The tungsten cylinder is made of tungsten-nickel-iron alloy, and its composition is calculated by mass percentage: 93% tungsten, 4.9% nickel, and 2.1% iron. The steel cylinder adopts 30Cr alloy structural steel. The nickel-based alloy powder is prepared by plasma rotating electrode atomization powder technology. The obtained powder is sieved through a 500-mesh screen to obtain the powder intermediate connecting material. The powder composition is calculated by mass percentage: 70% nickel, 25% iron, 5% cobalt .

[0062] The tungsten cylinder and the steel cylinder are placed on a grinder for surface processing to make the surface roughness 0.8 μm, and then placed in a nitric acid solution with a concentration of 30% for 30 min.

[0063] Place the welded parts of tungsten and steel in a stacked structure of tungsten lining / steel jacket (the distance between the two is 2 mm), and then lay the powder intermediate connecting material between the welded parts of tungsten and stee...

Embodiment 3

[0067] The tungsten cylinder is made of tungsten-nickel-iron alloy, and its composition is calculated by mass percentage: 90% tungsten, 7% nickel, and 3% iron. The steel cylinder adopts 30Cr alloy structural steel. The nickel-based alloy powder is prepared by plasma rotating electrode atomization powder technology. The obtained powder is sieved through a 500-mesh screen to obtain the powder intermediate connection material. The powder composition is calculated by mass percentage: 65% nickel, 20% iron, 10% copper , 5% cobalt.

[0068] The tungsten cylinder and the steel cylinder were placed on a milling machine for surface processing to make the surface roughness 1.6 μm, and then placed in a nitric acid solution with a concentration of 40% for 20 min.

[0069] Place the welded parts of tungsten and steel according to the laminated structure of tungsten lining / steel jacket (the distance between the two is 5 mm), and then lay the powder intermediate connecting material between the we...

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Abstract

The invention relates to a hot isostatic pressure diffusion bonding method of a tungsten / steel cylinder structural part, and belongs to the technical field of metal welding. According to the hot isostatic pressure diffusion bonding method of the tungsten / steel cylinder structural part, nickel base alloy powder serves as an intermediate bonding material, assembling is conducted according to the laminated structure of a tungsten lining cylinder part / the powdery intermediate bonding material / a steel outer sleeve cylinder part, and then a hot isostatic pressure process is conducted to obtain thetungsten / steel cylinder structural part. By means of the tungsten / steel hot isostatic pressure diffusion bonding method, the problem of bonding of a tungsten / steel two-metal special-shaped part is solved, the preparation process is simple, the production period is short, and the obtained tungsten / steel two-metal cylinder structural part is free of interface defects, high in bonding strength and good in interface stability.

Description

Technical field [0001] The invention relates to a hot isostatic pressure diffusion joining method of tungsten / steel cylindrical structural parts, belonging to the technical field of metal material welding. Background technique [0002] Tungsten is the element with the highest melting point and lowest vapor pressure among all metal elements, which is very suitable for high temperature and high pressure environments. However, due to the inherent brittleness of tungsten and the limitation of the preparation method, it is difficult to obtain large-sized and complex-shaped all-tungsten components. The development of tungsten / steel composite structures to replace all-tungsten structures can not only increase the ease of use of components, but also give full play to each Performance advantages of connecting materials. For example, the cylindrical connecting piece of tungsten and its alloy and steel is the preferred composite structure of the divertor in the DEMO device of nuclear fusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/10B22F7/00B23K20/02B23K20/16B23K20/24
CPCB23K20/026B23K20/16B23K20/24
Inventor 马运柱蔡青山刘文胜朱文谭梁超平唐赛
Owner CENT SOUTH UNIV
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