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A kind of tungsten/transition layer/steel composite material and its preparation method of low temperature and low pressure active diffusion connection

A composite material, diffusion joining technology, applied in welding equipment, chemical instruments and methods, layered products, etc., can solve the problems of large residual stress of joints, high welding condition requirements, long connection time, etc., and achieve low residual stress and joints. The effect of good size adaptability and high-efficiency connection

Active Publication Date: 2017-07-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the combination of structure and process, the problems of large residual stress, low strength and high welding conditions (high temperature, high pressure, long connection time) of existing tungsten / steel connectors are solved.

Method used

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  • A kind of tungsten/transition layer/steel composite material and its preparation method of low temperature and low pressure active diffusion connection
  • A kind of tungsten/transition layer/steel composite material and its preparation method of low temperature and low pressure active diffusion connection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The low-temperature and low-pressure active diffusion connection method of tungsten and steel in this embodiment is carried out according to the following steps:

[0036] 1. Surface cleaning: first use 150#, 400#, 800#, 1200# and 1500# metallographic sandpaper to grind and polish the connection surface between tungsten and steel to be welded step by step until the surface finish is 3μm, and then use ultrasonic The washer (setting the cleaning temperature at 35°C) cleans the material to be welded in absolute ethanol, acetone, and absolute ethanol for 15 minutes each, so as to remove oil and impurities on the surface of the sample to be welded. In order to prevent the materials to be welded from being oxidized or polluted again, they should be stored in absolute ethanol for later use.

[0037] 2. Preparation of tungsten / transition layer / steel structural parts: First, braze the soft intermediate layer Cu (thickness about 0.1mm) in the optimized transition layer and the ste...

Embodiment 2

[0040] The low-temperature and low-pressure active diffusion connection method of tungsten and steel in this embodiment is carried out according to the following steps:

[0041] 1. Surface cleaning: first use 150#, 400#, 800#, 1200# and 1500# metallographic sandpaper to grind and polish the connection surface between tungsten and steel to be welded step by step until the surface finish is 5μm, and then use ultrasonic The washer (setting the cleaning temperature at 35°C) cleans the material to be welded in absolute ethanol, acetone, and absolute ethanol for 10 minutes each in order to remove oil and impurities on the surface of the sample to be welded. In order to prevent the materials to be welded from being oxidized or polluted again, they should be stored in absolute ethanol for later use.

[0042] 2. Preparation of tungsten / transition layer / steel structural parts: first, the soft intermediate layer Ni (thickness about 0.3mm) in the optimally designed transition layer and th...

Embodiment 3

[0045] The low-temperature and low-pressure active diffusion connection method of tungsten and steel in this embodiment is carried out according to the following steps:

[0046] 1. Surface cleaning: first use 150#, 400#, 800#, 1200# and 1500# metallographic sandpaper to grind and polish the connection surface between tungsten and steel to be welded step by step until the surface finish is 3μm, and then use ultrasonic The washer (setting the cleaning temperature at 35°C) cleans the material to be welded in absolute ethanol, acetone, and absolute ethanol for 20 minutes each to remove oil and impurities on the surface of the sample to be welded. In order to prevent the materials to be welded from being oxidized or polluted again, they should be stored in absolute ethanol for later use.

[0047] 2. Preparation of tungsten / transition layer / steel structural parts: Firstly, the soft intermediate layer Cu (thickness about 0.5mm) in the optimally designed transition layer is vacuum-dif...

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Abstract

The invention relates to a tungsten / transition layer / steel composite material and a low-temperature and low-pressure active diffusion connection preparation method thereof, and belongs to the technical field of preparation of composite materials. Raw materials used for preparing the tungsten / transition layer / steel composite material comprise a tungsten substrate, an active metal Ti layer, a soft interface layer and a steel substrate. The method comprises the following steps: welding the soft interface layer and the steel substrate through a traditional welding process, sequentially superposing the obtained layer to the active metal Ti layer and the tungsten substrate, and carrying out vacuum diffusion connection to prepare a tungsten substrate / titanium layer / soft interface layer / steel substrate connecting piece which is the high-performance tungsten / steel composite material. The tensile strength of the composite material is greater than or equal to 386MPa. The composite material has a reasonably designed structure, and the problems of large joint residual stress, low strength and high requirements of welding conditions of present tungsten / steel connecting pieces are solved through matching of the structure with the method. The preparation method is simple, and is convenient for industrial application.

Description

technical field [0001] The invention relates to a tungsten / transition layer / steel composite material and a preparation method thereof for low-temperature and low-pressure active diffusion connection, 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. [0003] At present, brazing and vacuum diffus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/18B23K20/02B23K20/16B23K20/14
CPCB23K20/02B23K20/14B23K20/16B32B15/013B32B15/015B32B2311/18B32B2311/22B32B2311/30
Inventor 马运柱刘文胜蔡青山
Owner CENT SOUTH UNIV
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