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Aluminum or aluminium alloy and copper vacuum diffusion welding method

A technology of vacuum diffusion and welding method, which is applied in the direction of welding equipment, welding/welding/cutting items, non-electric welding equipment, etc. It can solve the problems of hindering the wetting of the base metal and the combination of the interface, reducing the comprehensive performance of the joint, and achieving industrialization. Production, enhanced contact wetting and interdiffusion, simple method effects

Active Publication Date: 2016-01-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] When vacuum diffusion welding is used, due to the active chemical properties of aluminum, it is easy to form a dense high-melting point oxide film on its surface. There is an oxide film on the surface of aluminum, which hinders the wetting of the base metal and the bonding of the interface, thereby reducing the joint. Comprehensive performance

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  • Aluminum or aluminium alloy and copper vacuum diffusion welding method

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specific Embodiment approach 1

[0017] Specific embodiment 1: The vacuum diffusion welding method of aluminum or aluminum alloy and copper described in this embodiment is specifically performed according to the following steps:

[0018] 1. Mechanically clean the aluminum or aluminum alloy parts to be welded, and then place them in an acetone solution for ultrasonic cleaning for 10 to 30 minutes to obtain the cleaned aluminum or aluminum alloy; mechanically clean the copper parts to be welded, and then place them in the acetone solution Ultrasonic cleaning for 10 minutes to 30 minutes to obtain cleaned copper;

[0019] 2. Place the cleaned aluminum or aluminum alloy in a plasma-enhanced chemical vapor deposition vacuum device and evacuate to a pressure of 10 -3 Below Pa, feed hydrogen gas at a gas flow rate of 20sccm~60sccm, adjust the vacuum speed to control the pressure in the plasma enhanced chemical vapor deposition vacuum device to 100Pa~300Pa, and raise the temperature to 100Pa~300Pa under hydrogen atmosphere...

specific Embodiment approach 2

[0027] Specific embodiment two: this embodiment is different from specific embodiment one in that in step two, the cleaned aluminum is placed in a plasma enhanced chemical vapor deposition vacuum device and evacuated to a pressure of 10 -3 Below Pa, hydrogen gas is introduced at a gas flow of 30 sccm, the vacuum speed is adjusted to control the pressure in the plasma enhanced chemical vapor deposition vacuum device to 250 Pa, and the temperature is raised to 200°C under a pressure of 250 Pa and a hydrogen atmosphere. Others are the same as the first embodiment.

specific Embodiment approach 3

[0028] Specific embodiment three: This embodiment is different from one of specific embodiments one or two in that: in step two, the cleaned aluminum is placed in a plasma enhanced chemical vapor deposition vacuum device and evacuated to a pressure of 10 -3 Below Pa, hydrogen gas was introduced at a gas flow rate of 50 sccm, the vacuum speed was adjusted to control the pressure in the plasma enhanced chemical vapor deposition vacuum device to 250 Pa, and the temperature was raised to 300°C under a pressure of 250 Pa and a hydrogen atmosphere. Others are the same as the first or second embodiment.

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Abstract

The invention relates to an aluminum and copper diffusion welding method, in particular to an aluminum or aluminium alloy and copper vacuum diffusion welding method, and aims to solve the problem that when vacuum diffusion welding is adopted, a layer of compact high-melting-point oxidation film is extremely easily formed on the surface of aluminium due to active chemical property of aluminium to hinder wetting of base metal and interface combination, so that the overall performance of a connector is reduced. The aluminum or aluminium alloy and copper vacuum diffusion welding method comprises the following steps: cleaning aluminum or aluminium alloy, putting the cleaned aluminum or aluminium alloy in a plasma enhanced chemical vapor deposition vacuum apparatus for deposition to obtain aluminum or aluminium alloy subjected to surface hydrogenation treatment, fitting the aluminum or aluminium alloy subjected to surface hydrogenation treatment and cleaned copper according to the manner that the to-be-welded parts are opposite, and putting the aluminum or aluminium alloy and the copper in a vacuum brazing furnace for vacuum diffusion. The method disclosed by the invention is used for aluminum or aluminium alloy and copper vacuum diffusion welding.

Description

Technical field [0001] The invention relates to a diffusion welding method of aluminum and copper. Background technique [0002] In recent years, due to the rapid development of contemporary aerospace, power electronics, atomic energy and other industries, copper-aluminum composite parts have become more and more widely used due to their excellent mechanical properties and electrical conductivity. For example, aluminum-copper composite sheets are widely used in some aviation instruments; aluminum pipes and copper pipes are connected to form a sealed joint, which is often used in the manufacture of refrigeration equipment, such as copper and aluminum joints, which are commonly used in the welding of household refrigerator condensers and refrigeration systems Places, heating equipment and other water circulation devices. [0003] Copper-aluminum connection belongs to the connection between dissimilar metals, and the common welding methods of dissimilar metal materials include brazin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K20/24B23K20/22
CPCB23K20/14B23K20/22B23K20/24B23K2103/18
Inventor 亓钧雷陈树林罗大林刘瑜琳林景煌冯吉才
Owner HARBIN INST OF TECH