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A kind of tungsten/steel composite material based on high temperature application and its preparation method

A composite material and high-temperature technology, which is applied in chemical instruments and methods, manufacturing tools, welding equipment, etc., can solve problems such as large residual stress of joints, degradation of joint performance, and low performance of joint joints, so as to improve high-temperature mechanical properties and increase room temperature Tensile properties, the effect of improving tensile properties at room temperature and high temperature

Active Publication Date: 2018-02-09
CENT SOUTH UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] Literature "Effect of joining temperature on the microstructure and strength of tungsten / ferritic steel joints diffusion bonded with a nickel interlayer, Zhong ZH, Jung H, Hinoki T, Kohyama A.: Journal of Materials Processing Technology 2010; 210: p. 1805-1810. " and "Effect of holding time on the microstructure and strength of tungsten / ferritic steel joints diffusion bonded with a nickel interlayer, Zhong ZH, Hinoki T, Kohyama A.: Materials Science and Engineering A 2009; 518: p.167-173." By adding Ni to prevent the direct diffusion of tungsten and steel to form brittle intermetallic compounds and relieve the residual stress of the joint, but the prepared tungsten / Ni / steel joint interface is easy to form Ni 4 W brittle phase, in addition, there is a large residual stress in the joint, resulting in poor performance of the joint joint, and the highest tensile strength of the joint is only 215MPa
[0005] Literature "Diffusion bonding between W and EUROFER97using V interlayer, Basuki WW, Aktaa J.:Journal of Nuclear Materials 2012; 429:p.335-340." and "Investigation of tungsten / EUROFER97diffusion bonding using Nb interlayer, Basuki WW, Aktaa J .:Fusion Engineering and Design 2011; 86:p.2585-2588."Using V and Nb as the intermediate layer to improve the quality of the diffusion connection between tungsten and steel, the tensile strength of the joint at room temperature can reach up to 207MPa and 272MPa respectively, but the connection A large number of metal carbides (Nb 2 C. Nb 6 C 5 or V 2 C) Limits the further improvement of joint performance
[0006] Yang Zonghui et al. reported in Rare Metal Materials and Engineering (2015,44(3):708-702) and Chinese Journal of Mechanical Engineering (2013,49(4):58-63): Using a tungsten-based high-density alloy intermediate layer, realized The high-quality combination of tungsten and steel, the maximum shear strength of the joint can reach 286MPa, but the composition of the joint interface is complex, and the performance of the joint needs to be further improved
[0007] In summary, due to the large difference in thermophysical properties between tungsten and steel in the diffusion connection of tungsten and steel, the residual stress of the joint after the connection is large, and the connection interface is prone to generate harmful phases such as highly hard and brittle intermetallic compounds, resulting in a decline in joint performance.
At present, there is no relatively mature process that can realize the high-performance connection of tungsten and steel

Method used

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  • A kind of tungsten/steel composite material based on high temperature application and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The diffusion bonding method of tungsten / steel dissimilar materials based on high-temperature applications in this embodiment is performed as follows:

[0027] 1. Surface cleaning: first use 150#, 400#, 800#, 1200# and 1500# metallographic sandpaper to polish and polish the joint surface of the welding material tungsten and steel to a surface finish of 0.5μm, and then use The ultrasonic cleaner (set the cleaning temperature at 35°C) cleans the materials to be welded in absolute ethanol, acetone, and absolute ethanol for 15 minutes in order to remove the oil and impurities on the surface of the sample to be welded. In order to prevent the material to be welded from being oxidized or contaminated again, place it in absolute ethanol and store it for later use.

[0028] 2. Pre-set composite structure middle layer: First, the optimized design Ti layer, Nb layer, and Ni layer are processed into thin slices with a thickness of 0.1mm, and then combined into a composite structure mid...

Embodiment 2

[0033] The diffusion bonding method of tungsten / steel dissimilar materials based on high-temperature applications in this embodiment is performed as follows:

[0034] 1. Surface cleaning: first use 150#, 400#, 800#, 1200# and 1500# metallographic sandpaper to polish and polish the connecting surface of the tungsten and steel to be welded to a surface finish of 1μm, and then use ultrasonic The cleaner (set the cleaning temperature to 35°C) cleans the materials to be welded in absolute ethanol, acetone, and absolute ethanol for 10 minutes each to remove oil and impurities on the surface of the sample to be welded. In order to prevent the material to be welded from being oxidized or contaminated again, place it in absolute ethanol and store it for later use.

[0035] 2. Pre-set composite structure middle layer: firstly process the optimized design Ti layer, Nb layer and Ni layer into thin slices with thickness of 0.1, 0.2, 0.5mm respectively, and then combine them into a composite str...

Embodiment 3

[0040] The diffusion bonding method of tungsten / steel dissimilar materials based on high-temperature applications in this embodiment is performed as follows:

[0041] 1. Surface cleaning: first use 150#, 400#, 800#, 1200# and 1500# metallographic sandpaper to polish and polish the joint surface of the welding material tungsten and steel to a surface finish of 3μm, and then use ultrasonic The cleaner (set the cleaning temperature to 35°C) cleans the materials to be welded in absolute ethanol, acetone, and absolute ethanol for 10 minutes each in order to remove oil stains and impurities on the surface of the samples to be welded. In order to prevent the material to be welded from being oxidized or contaminated again, place it in absolute ethanol and store it for later use.

[0042] 2. Pre-set composite structure middle layer: firstly process the optimized design Ti layer, Nb layer and Ni layer into thin slices with thicknesses of 0.05, 0.3, and 0.1mm respectively, and then combine th...

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Abstract

The invention relates to a high-performance tungsten / steel composite material based on high-temperature application and a preparation method thereof and belongs to the technical field of preparation of composite materials. By adoption of the high-performance tungsten / steel composite material, the problems of large residual joint stress, low strength, poor heat resistance and high connection temperature in an existing tungsten / steel connector are solved. The high-performance tungsten / steel composite material is prepared from a tungsten-based layer, a titanium layer, a niobium layer, a nickle layer and a steel-based layer which are arranged in sequence and prepared by adopting a welding method. The high-performance tungsten / steel composite material is obtained by superposing the tungsten-based layer, the titanium layer, the niobium layer, the nickle layer and the steel-based layer in sequence according to the superposition mode of the tungsten-based layer, the titanium layer, the niobium layer, the nickle layer and the steel-based layer and carrying out vacuum diffusion bonding. The high-performance tungsten / steel composite material has the advantages that the room-temperature tensile strength is larger than or equal to 352MPa, and the tensile strength at the temperature of 650DEG C is larger than or equal to 338MPa; the structure design is reasonable, the process is simple, the large-scale application is convenient, and simultaneously, the high-performance tungsten / steel composite material can be widely applied in diffusion bonding of refractory metal and other dissimilar metal materials.

Description

Technical field [0001] The invention relates to a tungsten / steel composite material based on high-temperature applications and a preparation method thereof; it belongs to the technical field of composite material preparation. Background technique [0002] Tungsten has excellent characteristics such as high density, high hardness, high strength, high temperature resistance and corrosion resistance, and is widely used in aerospace, weaponry, energy and electronics fields. Due to the inherent brittleness of tungsten and the limitation of the preparation method, it is difficult to obtain pure tungsten components of large size and complex shape. The development of tungsten / steel composite structure to replace all tungsten structure can not only increase the convenience of use of components, but also give full play to all connections. Material performance advantages. However, the thermophysical and mechanical properties of tungsten and steel are quite different, resulting in poor weld...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/18B32B37/10B32B37/06B23K20/00
CPCB23K20/00B32B15/013B32B37/06B32B37/10B32B2307/306B32B2311/18B32B2311/22B32B2311/30
Inventor 马运柱蔡青山刘文胜
Owner CENT SOUTH UNIV
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