High-performance tungsten/steel composite material based on high-temperature application and preparation method thereof

A composite material and high-performance technology, 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 Tensile properties at room temperature, effects of improving tensile properties at room temperature and high temperature

Active Publication Date: 2016-01-06
CENT SOUTH UNIV
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Problems solved by technology

[0004] 文献“Effectofjoiningtemperatureonthemicrostructureandstrengthoftungsten / ferriticsteeljointsdiffusionbondedwithanickelinterlayer,ZhongZH,JungH,HinokiT,KohyamaA.:JournalofMaterialsProcessingTechnology2010;210:p.1805-1810.”和“Effectofholdingtimeonthemicrostructureandstrengthoftungsten / ferriticsteeljointsdiffusionbondedwithanickelinterlayer,ZhongZH,HinokiT,KohyamaA.:MaterialsScienceandEngineeringA2009;518:p.167-173.” By adding Ni to prevent the direct diffusion connection 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] 文献“DiffusionbondingbetweenWandEUROFER97usingVinterlayer,BasukiWW,AktaaJ.:JournalofNuclearMaterials2012;429:p.335-340.”和“Investigationoftungsten / EUROFER97diffusionbondingusingNbinterlayer,BasukiWW,AktaaJ.:FusionEngineeringandDesign2011;86:p.2585-2588.”分别采用V和Nb作中间层 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 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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  • High-performance tungsten/steel composite material based on high-temperature application and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The diffusion bonding method of high-performance tungsten / steel heterogeneous materials based on high-temperature applications in this embodiment is carried out in the following steps:

[0027] 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 0.5μm, then, use The ultrasonic cleaner (set the cleaning temperature at 35°C) cleans the material to be welded in absolute ethanol, acetone, and absolute ethanol for 15 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.

[0028] 2. Pre-set the middle layer of composite structure: firstly, the optimally designed Ti layer, Nb layer, and Ni layer are all processed into thin slices with a thickness ...

Embodiment 2

[0033] The diffusion bonding method of high-performance tungsten / steel heterogeneous materials based on high-temperature applications in this embodiment is carried out in the following steps:

[0034] 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 1μm, 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.

[0035] 2. Pre-set the middle layer of the composite structure: firstly process the optimally designed Ti layer, Nb layer, and Ni layer into thin slices with a thic...

Embodiment 3

[0040] The diffusion bonding method of high-performance tungsten / steel heterogeneous materials based on high-temperature applications in this embodiment is carried out in 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 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 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. Pre-set the middle layer of the composite structure: firstly process the optimally designed Ti layer, Nb layer, and Ni layer into thin slices with a thic...

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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 high-performance tungsten / steel composite material based on high-temperature application and a preparation method thereof, 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. However, the thermal physical properties and mechanical properties of tun...

Claims

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Application Information

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Patent Type & Authority Applications(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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