Solder used for vacuum active brazing process of W-Cu composite material and stainless steel and method

A composite material, active brazing technology, applied in welding/cutting media/materials, welding media, manufacturing tools, etc., can solve problems affecting the air tightness and bearing capacity of joints, reduction of mechanical properties of weld metal, and differences in physical and chemical properties It is easy to popularize and apply, with small residual stress and good wetting and spreading.

Inactive Publication Date: 2016-06-01
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When W-Cu composite material is connected with stainless steel, its physical and chemical properties are quite different, which seriously affects the performance of both.
Moreover, W-Cu composite materials are highly sensitive to gas impurities, and are prone to embrittlement phases and micropores, which seriously affect the airtightness and bearing capacity of joints.
When W-Cu composite materials are welded with stainless steel, the cyclic thermal load will have adverse effects on W-Cu composite materials and stainless steel composite parts, and it is easy to have coarse grains in the welding zone, embrittlement of the structure, residual stress, gas impurity pollution and stress concentration, etc. Phenomenon, the fracture tendency of the joint increases, and the mechanical properties of the weld metal decrease

Method used

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  • Solder used for vacuum active brazing process of W-Cu composite material and stainless steel and method
  • Solder used for vacuum active brazing process of W-Cu composite material and stainless steel and method
  • Solder used for vacuum active brazing process of W-Cu composite material and stainless steel and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Vacuum active brazing of W-Cu composite material (W55Cu45, wt%) and 1Cr18Ni9 stainless steel butt joint: W-Cu composite material and stainless steel sample size are 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm section.

[0023] The composition and mass percentage ratio of the solder are: Cu33%, Ti1.0%, Ni5%, Zr1.0%, Mn7.0%, the balance is Ag, and the thickness of the solder foil is 150 μm.

[0024] Brazing process such as figure 1 As shown, the specific steps are:

[0025] (1) Preparation stage: Clean the cross-section of the W-Cu composite material and 1Cr18Ni9 stainless steel sample to be brazed, remove the impurities, oil stains and oxide film on the surface, use W28~W3.5 metallographic sandpaper to grind smooth and have a certain roughness, put the W-Cu composite material, stainless steel and solder foil together in acetone, use ultrasonic cleaning for 10min, and dry it for use;

[0026] (2) Assembly stage: place the cleaned and dried solder foil betwee...

Embodiment 2

[0030] Vacuum active brazing of W-Cu composite material (W55Cu45, wt%) and 1Cr18Ni9 stainless steel butt joint: W-Cu composite material and stainless steel sample size are 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm section.

[0031]The composition and mass percentage ratio of solder are: the composition and mass percentage ratio of solder are: Cu30%, Ti2.0%, Ni4.0%, Zr1.5%, Mn5.0, the balance is Ag, brazing The thickness of the material foil is 120 μm.

[0032] The brazing process steps are:

[0033] (1) Preparatory stage: Clean the cross-section of the W-Cu composite material and stainless steel sample to be brazed to remove impurities, oil stains and oxide films on the surface, and use W28~W3.5 metallographic sandpaper to grind smooth and have a certain Roughness, put the W-Cu composite material, stainless steel and solder foil together in acetone, use ultrasonic cleaning for 15 minutes, and dry it for use;

[0034] (2) Assembly stage: place the cleaned and dr...

Embodiment 3

[0038] Vacuum active brazing of W-Cu composite material (W55Cu45, wt%) and 1Cr18Ni9 stainless steel butt joint: W-Cu composite material and stainless steel sample size are 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm section.

[0039] The composition and mass percentage ratio of the solder are: Cu27%, Ti3.0%, Ni3.5%, Zr1.8%, Mn4.0, and the balance is Ag. The solder foil thickness is 100 μm.

[0040] The brazing process steps are:

[0041] (1) Preparatory stage: Clean the cross-section of the W-Cu composite material and stainless steel sample to be brazed to remove impurities, oil stains and oxide films on the surface, and use W28~W3.5 metallographic sandpaper to grind smooth and have a certain Roughness, put the W-Cu composite material, stainless steel and solder foil together in acetone, use ultrasonic cleaning for 10-15 minutes, and dry it for use;

[0042] (2) Assembly stage: place the cleaned and dried solder foil between the surface of stainless steel and W-C...

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Abstract

The invention discloses solder used for the vacuum active brazing process of a W-Cu composite material and stainless steel and a preparation method. The selected solder comprises, by weight, 25%-33% of Cu, 1.0%-3.5% of Ti, 3.0%-5.0% of Ni, 1.0%-2.2% of Zr, 3.5%-7.0% of Mn and the balance Ag. The solder has good lubricity for the W-Cu composite material and the stainless steel, the melting temperature is low, and melting of the solder is uniform. The vacuum active brazing process by using the solder to connect the W-Cu composite material with the stainless steel is stable and reliable. Under the vacuum condition, a component is in a vacuum state in the heating process, and the whole component is free of deformation, microscopic cracks, pores, mixed impurities and other defects; by means of the high diffusibility and interface reaction ability of the active elements (the Ag, the Cu, the Ti, the Ni and the Zr), distribution of the active elements is uniform, crystal grains are fine, and residual stress is small; the overall strength of the connector is high, and the plastic deformation ability is high; operation is easy, convenient and efficient, and repeated representation can be achieved.

Description

technical field [0001] The invention relates to a solder and a method for the vacuum active brazing process of W-Cu composite material and stainless steel, belonging to the field of brazing. Background technique [0002] W-Cu composite material combines many properties of W and Cu. It has good electrical and thermal conductivity, high strength and hardness, low thermal expansion coefficient, good arc erosion resistance, high temperature oxidation resistance and welding resistance. and other excellent features. It is widely used in the fields of energy, defense industry, aerospace, and nuclear industry. It mainly involves components such as rail missile heads, rocket engine nozzle throat linings, nozzles, and gas rudders. It is a high-temperature composite material with great development and progress. Stainless steel has good corrosion resistance, heat resistance and good mechanical properties. It is suitable for the manufacture of parts and equipment that require corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K1/20B23K1/008
CPCB23K35/3006B23K1/008B23K1/20B23K1/206
Inventor 夏春智杨骏许祥平邹家生
Owner JIANGSU UNIV OF SCI & TECH
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