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Braze welding process for copper-aluminum composite liquid cooled component

A copper-aluminum composite and brazing technology, which is applied in the manufacture of tools, metal processing, welding equipment, etc., can solve the problems of difficult to achieve good connection, low density, etc.

Active Publication Date: 2019-04-12
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Copper-aluminum composite components have the advantages of high thermal conductivity of copper and low density of aluminum, and are gradually being used in aerospace, electronics, automobiles, new energy and other industries. Due to the large difference in performance between copper and aluminum, it is difficult to use conventional welding processes after compounding. achieve a good connection
[0003] At present, copper-aluminum composite board components in the electronics industry are mainly used to meet the heat dissipation requirements of functional parts. Copper-aluminum composite boards are mostly formed by direct forging or explosive welding. The formed materials are usually machined and used directly as heat dissipation structural parts, and there is little subsequent processing. Reuse of soldered connections reported

Method used

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  • Braze welding process for copper-aluminum composite liquid cooled component
  • Braze welding process for copper-aluminum composite liquid cooled component
  • Braze welding process for copper-aluminum composite liquid cooled component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] see figure 1 , a vacuum brazing device for welding copper-aluminum composite liquid-cooled components includes a positioning frame mechanism and a pressurizing mechanism.

[0051] see figure 2 , The positioning frame mechanism includes a positioning frame mechanism formed by fixed connection of the top plate 7, the bottom plate 1 and five side plates. The five side panels are strip panels with the same structure. The top plate 7 and the bottom plate correspond up and down, and one side of the length direction of the top plate 7 and one side of the corresponding bottom plate 1 in the length direction are fixedly connected by three side plates 9 by screws; The other side of the direction is open, which is convenient for putting in or taking out the pressurizing mechanism; the two sides in the width direction of the top plate 7 and the two sides in the width direction of the corresponding bottom plate 1 are respectively fixed and connected by a side plate 9 by screws. ...

Embodiment 2

[0057] Vacuum brazing device for copper-aluminum composite liquid-cooled components welding involves two structural parts to be brazed, one of which is a copper-aluminum plate, which is made of an oxygen-free copper plate (TU1) with a thickness of 1mm and a pure aluminum plate 1070 with a thickness of 15mm. High-vacuum press molding, a liquid cooling channel is provided on one side of the pure aluminum plate; the other structural part is an aluminum cover plate 1070 with a thickness of 1mm; the copper-aluminum plate and the aluminum cover plate with a liquid cooling channel are brazed to form a sealed cavity. The vacuum brazing operation steps are as follows:

[0058] (1) Cleaning treatment

[0059] Alkali washing, cold water washing, acid washing, cold water washing, hot water washing are used for copper aluminum plate and aluminum cover plate respectively, and compressed air is used to dry and dry.

[0060] Among them, alkali washing is to use 3% to 5% soda ash aqueous solu...

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Abstract

The invention relates to a braze welding process for a copper-aluminum composite liquid cooled component. The braze welding process firstly comprises a vacuum braze welding process device, and the device comprises a positioning frame mechanism and a pressurization mechanism. Vacuum braze welding comprises the following steps that (1), alkali washing, acid washing and cold and hot water washing treatment are performed on a copper-aluminum plate and an aluminum cover plate correspondingly; (2), polishing and cleaning are performed on a welding piece, the welding piece is an aluminum-copper-silicon-nickel-magnesium welding piece, and the melting point is 490-535 DEG C; (3), the cleaned welding piece is placed between contact surfaces of the copper-aluminum plate and the aluminum cover plate two structural parts; (4), the braze welding parts preset with the welding piece are enclosed into the vacuum braze welding device; and (5), four stages of heating and heat preservation are performed correspondingly inside a vacuum braze welding furnace, the braze welding is finished, and a qualified copper-aluminum composite liquid cooled component welded part is obtained. According to the braze welding process for the copper-aluminum composite liquid cooled component, counteracting of stress caused by mismatch of the copper-aluminum expansion coefficient of the braze welding parts under heatcycle is realized utilizing the vacuum braze welding device, and the fact that the planeness of the copper-aluminum composite liquid cooled component after the vacuum braze welding is less than 0.2 mmis realized.

Description

technical field [0001] The invention belongs to the field of design and manufacture of liquid-cooled structures, and the core technology is special welding of composite plates of dissimilar materials, in particular to a vacuum brazing process of copper-aluminum composite liquid-cooled components. technical background [0002] Copper-aluminum composite components have the advantages of high thermal conductivity of copper and low density of aluminum, and are gradually being used in aerospace, electronics, automobiles, new energy and other industries. Due to the large difference in performance between copper and aluminum, it is difficult to use conventional welding processes after compounding. Make a good connection. [0003] At present, copper-aluminum composite board components in the electronics industry are mainly used to meet the heat dissipation requirements of functional parts. Copper-aluminum composite boards are mostly formed by direct forging or explosive welding. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K3/00B23K3/08B23K1/20B23K1/008
CPCB23K1/008B23K1/20B23K1/206B23K3/00B23K3/08
Inventor 梁宁王国超吴斌祁占成沈林鲁祖荣
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST