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A high-strength joining process of w‑cu alloy and the same material

A high-strength technology of the same material, applied in metal processing equipment, welding/cutting media/materials, welding media, etc., can solve the problems of cumbersome and complicated manufacturing processes, low connection strength, and large cost investment, and achieve convenience and wide application Popularization and application, fine joint structure and excellent plastic performance

Active Publication Date: 2017-11-14
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of production and use, high temperature sintering and hot isostatic pressing are usually used to realize the connection between W-Cu alloys. The manufacturing process is cumbersome and complicated, the cost is large, and the connection strength is low. The use requirements and the excellent performance of W-Cu alloy
W-Cu alloys are highly sensitive to gas impurities, and are prone to brittle phases and micropores, which seriously affect the airtightness and load-carrying capacity of the connection area, which is difficult to meet with the general connection method.

Method used

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  • A high-strength joining process of w‑cu alloy and the same material
  • A high-strength joining process of w‑cu alloy and the same material
  • A high-strength joining process of w‑cu alloy and the same material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The W-Cu alloy (W55Cu45, wt%) is butt vacuum brazed. The size of the two W-Cu alloy samples is 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm.

[0023] The composition and mass percentage of the solder are: Cu78.8%, Mn7.8%, Co4.7%, Ni2.4%, Zr3.5%, Ti2.8%, and the thickness of the solder is 150 μm.

[0024] The brazing process steps are:

[0025] (1) Preparation: Clean up the W-Cu alloy and solder to be brazed, using 5% HF, 20% HNO 3 and 75%H 2 Pickling with O solution, cleaning the W-Cu alloy surface for 5 minutes, using W28, W14, W7, W3.5 metallographic sandpaper to polish the surface of the W-Cu alloy to be welded smooth and W5, W3.5 metallographic sandpaper for brazing Polish the surface of the material foil to remove impurities, oil stains and oxide films on the surface, place the W-Cu composite material and the solder foil in acetone, use ultrasonic cleaning for 15 minutes, and perform drying treatment;

[0026] (2) Assembly: Place the cleaned brazing m...

Embodiment 2

[0030] The W-Cu alloy (W55Cu45, wt%) is butt vacuum brazed. The size of the two W-Cu alloy samples is 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm.

[0031] The composition and mass percentage of the solder are: Ag70.5%, Cu23%, Ti3.8%, Ni2.5%, B0.2%, and the thickness of the solder is 100 μm.

[0032] The brazing process steps are:

[0033] (1) Preparation: Clean up the W-Cu alloy and solder to be brazed, using 5% HF, 20% HNO 3 and 75%H 2 Pickling with O solution, cleaning the W-Cu alloy surface for 5 minutes, using W28, W14, W7, W3.5 metallographic sandpaper to polish the surface of the W-Cu alloy to be welded smooth and W5, W3.5 metallographic sandpaper for brazing Polish the surface of the material foil to remove impurities, oil stains and oxide films on the surface, place the W-Cu composite material and the solder foil in acetone, use ultrasonic cleaning for 10 minutes, and perform drying treatment;

[0034] (2) Assembly: Place the cleaned brazing material fo...

Embodiment 3

[0038] The W-Cu alloy (W75Cu25, wt%) is butt vacuum brazed. The size of the two W-Cu alloy samples is 20mm×20mm×6mm, and the surface to be brazed is 20mm×6mm.

[0039] The composition and mass percentage of the solder are: Cu78.8%, Mn7.8%, Co4.7%, Ni2.4%, Zr3.5%, Ti2.8%, and the thickness of the solder is 150 μm.

[0040] The brazing process steps are:

[0041] (1) Preparation: Clean up the W-Cu alloy and solder to be brazed, using 5% HF, 20% HNO 3 and 75%H 2 Pickling with O solution, cleaning the surface of W-Cu alloy for 10min, using W28, W14, W7, W3.5 metallographic sandpaper to polish the surface of W-Cu alloy to be welded smooth and W5, W3.5 metallographic sandpaper for soldering Polish the surface of the material foil to remove impurities, oil stains and oxide films on the surface, place the W-Cu composite material and the solder foil in acetone, use ultrasonic cleaning for 15 minutes, and perform drying treatment;

[0042] (2) Assembly: Place the cleaned brazing mate...

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Abstract

The invention discloses a high-strength connection process for W-Cu alloy. The high-strength connection process includes steps of (1) preparation phases, (2) assembly phases and (3) brazing connection phases. The brazing connection phases include arranging assembled patterns in vacuum brazing equipment and carrying out brazing connection on the patterns. The high-strength connection process has the advantages that the high-strength connection process is simple and convenient, the to-be-welded W-Cu alloy does not need to be subjected to surface modification treatment before brazing is carried out and can be directly welded by means of vacuum brazing connection, and protection measures can be omitted; the W-Cu alloy can be subjected to high-strength connection by the aid of gap control, application of appropriate pressures and argon filling protection and quick quenching, connectors are excellent in shaping performance, micro-structures of the connectors are dense, residual stress is low, weld components are free of deformation, grain coarsening can be prevented, problems of oxidation, pollution and the like can be solved, and the brazed connectors are high in strength; the high-strength connection process is repeatable and is convenient to widely popularize and apply.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a high-strength connection process of W-Cu alloy and the same material. Background technique [0002] W-Cu alloy combines many excellent 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, electric power, aerospace, national defense industry, nuclear industry, etc., and 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. . In the process of production and use, high temperature sintering and hot isostatic pressing are usually used to realize the connection between W-Cu alloys. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20B23K35/30
CPCB23K1/0008B23K1/008B23K1/206B23K35/3006B23K35/302B23K2103/12
Inventor 夏春智杨骏许祥平邹家生
Owner JIANGSU UNIV OF SCI & TECH
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