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Tungsten/steel dispersion connecting method based on tungsten surface gradient alloying

A surface gradient and diffusion connection technology, applied in welding/welding/cutting items, welding equipment, welding equipment, etc., can solve the problems of thermal stability and large residual stress at the interface that is easy to generate brittle intermetallic compounds, and improve thermal fatigue. Performance, interdiffusion and penetration enhancement, and the effect of improving metallurgical bonding ability

Inactive Publication Date: 2017-10-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: aiming at the deficiencies of the prior art, a tungsten / steel diffusion bonding method based on tungsten surface gradient alloying is provided, which effectively solves the problem of large residual stress during tungsten / steel welding and the The problem of poor interface thermal stability caused by harmful phases such as brittle intermetallic compounds is easy to form, which greatly improves the reliability of tungsten / steel composite structural parts under thermal cycle loads

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  • Tungsten/steel dispersion connecting method based on tungsten surface gradient alloying

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Embodiment 1

[0035] A tungsten / steel diffusion bonding method based on tungsten surface gradient alloying in this embodiment is carried out in the following steps:

[0036] 1. Preparation of nano-scale Ni-Fe pre-alloyed mixed powder: Weigh Ni and Fe element powders according to the mass ratio of 7:3, and place them in a planetary high-energy ball mill for mechanical alloying treatment to obtain nano-scale Ni-Fe pre-alloyed powders. Alloy mixed powder;

[0037] 2. Compression molding: the Ni-Fe pre-alloyed mixed powder obtained by ball milling is pressed on a hydraulic press to form a disc compact with a thickness of about 3 mm;

[0038] 3. Surface modification: firstly, the tungsten matrix material and the Ni-Fe pre-alloyed mixed powder compact are laminated and assembled, and placed in a vacuum hot-press furnace, and then the furnace temperature is raised to 1100 ° C, kept for 60 minutes, and in Load a connection pressure of 5 MPa during the heat preservation process, then unload the pre...

Embodiment 2

[0044] A tungsten / steel diffusion bonding method based on tungsten surface gradient alloying in this embodiment is carried out in the following steps:

[0045] 1. Preparation of nano-scale Ni-Fe pre-alloyed mixed powder: Weigh Ni and Fe element powders according to the mass ratio of 7:3, and place them in a planetary high-energy ball mill for mechanical alloying treatment to obtain nano-scale Ni-Fe pre-alloyed powders. Alloy mixed powder;

[0046] 2. Compression molding: the Ni-Fe pre-alloyed mixed powder obtained by ball milling is pressed on a hydraulic press to form a disc compact with a thickness of about 3mm;

[0047] 3. Surface modification: Firstly, the tungsten matrix material and the Ni-Fe pre-alloyed mixed powder compact are laminated and assembled, and placed in a vacuum hot-press furnace, and then the furnace temperature is raised to 1000 ° C, kept for 60 minutes, and in Load a connection pressure of 10MPa during the heat preservation process, then unload the pres...

Embodiment 3

[0051] A tungsten / steel diffusion bonding method based on tungsten surface gradient alloying in this embodiment is carried out in the following steps:

[0052] 1. Preparation of nano-scale Ni-Fe pre-alloyed mixed powder: Weigh Ni and Fe element powders according to the mass ratio of 7:3, and place them in a planetary high-energy ball mill for mechanical alloying treatment to obtain nano-scale Ni-Fe pre-alloyed powders. Alloy mixed powder;

[0053] 2. Compression molding: the Ni-Fe pre-alloyed mixed powder obtained by ball milling is pressed on a hydraulic press to form a disc compact with a thickness of about 3mm;

[0054] 3. Surface modification: Firstly, the tungsten matrix material and the Ni-Fe pre-alloyed mixed powder compact are stacked and assembled, and placed in a vacuum hot-press furnace, and then the furnace temperature is raised to 1200 ° C, kept for 30 minutes, and in Load a connection pressure of 5 MPa during the heat preservation process, then unload the pressu...

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Abstract

The invention relates to a tungsten / steel diffusion connection method based on tungsten surface gradient alloying, belonging to the technical field of composite material preparation. In the present invention, the nano-scale pre-alloyed mixed powder with a mass ratio of Ni and Fe of 7:3 is used as a raw material, and the surface of the tungsten substrate is subjected to gradient alloying treatment by high-temperature cladding and vacuum hot-pressing composite technology, and then the vacuum of tungsten and steel is carried out. Diffuse connection. The present invention forms a gradient alloy layer on the surface of the tungsten substrate through the configuration of nickel and iron components, vacuum hot pressing, high temperature cladding and vacuum diffusion and other process or parameter optimization, and obtains no defects at the interface and thermal fatigue performance Good, high interface stability of tungsten / steel composite structural parts. It can be used in the preparation of helium-cooled divertor components in magnetic confinement nuclear fusion experimental devices.

Description

technical field [0001] The invention relates to a tungsten / steel diffusion connection method based on tungsten surface gradient alloying, belonging to the technical field of composite material preparation. Background technique [0002] Tungsten has excellent properties such as high density, high hardness, high strength, high temperature resistance and corrosion resistance, and is widely used in aerospace, weaponry, energy and electronics and other fields. Due to the inherent brittleness of tungsten and the limitations of the preparation method, it is difficult to obtain large-sized and complex-shaped pure tungsten components. The development of tungsten / steel composite structures to replace all-tungsten structures can not only increase the convenience of use of components, but also comprehensively play the role of various connections. Material performance advantages. For example, in the magnetic confinement nuclear fusion reactor experimental device, neutron irradiation and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/08B22F1/00B23K1/008B23K31/02B23K103/18
CPCB22F7/064B22F1/0003B22F2999/00B23K1/008B23K31/02B23K2103/18B22F2207/01
Inventor 蔡青山马运柱刘文胜
Owner CENT SOUTH UNIV
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