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Method for producing irregular-section composite pipe

A special-shaped cross-section, composite pipe technology, applied in the direction of furnace types, manufacturing tools, heat treatment equipment, etc., can solve the problems of large thermal resistance, inability to achieve high-efficiency heat transfer, and difficult metallurgical bonding of stainless steel pipes and aluminum alloys in large areas. Achieve wide application prospects, high interface heat transfer coefficient, and long bonding strength

Inactive Publication Date: 2010-06-23
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, composite heat pipes prepared by mechanical bonding or filling with thermal grease, thermal adhesive, etc. have a large thermal resistance at the interface junction, which cannot meet the needs of heat transfer performance.
Ordinary brazing technology is also difficult to achieve large-area metallurgical bonding of stainless steel tubes and aluminum alloys, and it cannot achieve the purpose of efficient heat transfer

Method used

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  • Method for producing irregular-section composite pipe
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  • Method for producing irregular-section composite pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a special-shaped cross-section composite pipe, the method steps are as follows,

[0023] (1) Extrusion molding of special-shaped cross-section aluminum tube 1: the pure aluminum bar is put into the extrusion barrel of the extrusion machine, and the bar is preheated at 450°C for hot extrusion;

[0024] (2) Modification of the surface of the inner hole of the special-shaped cross-section aluminum tube 1: a nickel layer with a thickness of 5-10 μm is plated on the surface of the inner hole of the aluminum alloy by using the electroless plating technology.

[0025] (3) Modification of the outer surface of the stainless steel pipe 2: plating a nickel layer of 10-20 μm on the outer surface of the stainless steel pipe by electroplating technology;

[0026] (4) Assembly and welding: Insert the surface-modified stainless steel tube into the special-shaped cross-section aluminum tube with surface modification in the inner hole. The stainless steel tube is ...

Embodiment 2

[0030] A preparation method of a special-shaped cross-section composite pipe, the method steps are as follows,

[0031] (1) Extrusion molding of special-shaped cross-section aluminum tube 1: the bar material made of deformed aluminum alloy is loaded into the extrusion barrel of the extrusion machine, and the bar material is preheated at 470°C for hot extrusion molding;

[0032] (2) Surface modification of the inner hole of the special-shaped cross-section aluminum tube 1: use electroless plating technology to plate a 5-10 μm thick copper layer on the surface of the inner hole of the aluminum alloy.

[0033] (3) Modification of the outer surface of the stainless steel pipe 2: use electroplating technology to plate a layer of 10-20 μm copper layer on the outer surface of the stainless steel pipe;

[0034] (4) Assembly and welding: insert the surface-modified stainless steel tube into the special-shaped cross-section aluminum tube with surface modification in the inner hole. The ...

Embodiment 3

[0038] A preparation method of a special-shaped cross-section composite pipe, the method steps are as follows,

[0039] (1) Extrusion forming of special-shaped cross-section aluminum tube 1: the bar material made of deformed aluminum alloy is loaded into the extrusion barrel of the extrusion machine, and the bar material is preheated at 485°C for hot extrusion molding;

[0040] (2) Surface modification of the inner hole of the special-shaped cross-section aluminum tube 1: use electroless plating technology to plate a 5-10 μm thick copper layer on the surface of the inner hole of the aluminum alloy.

[0041] (3) Modification of the outer surface of the stainless steel pipe 2: use electroplating technology to plate a layer of 10-20 μm copper layer on the outer surface of the stainless steel pipe;

[0042] (4) Assembly and welding: insert the surface-modified stainless steel tube into the special-shaped cross-section aluminum tube with surface modification in the inner hole. The ...

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Abstract

The invention discloses a method for producing irregular-section composite pipes, belonging to the technical field of metal composite materials. The method comprises the following steps: an irregular-section aluminum pipe is extruded and formed, the surface of the inner hole of the irregular-section aluminum pipe is modified, the external surface of a stainless steel pipe is modified, the surface-modified stainless steel pipe is inserted into the inner-hole-surface-modified irregular-section aluminum pipe, the assembling end parts of the stainless steel pipe and the irregular-section aluminum pipe are sealed after the assembling is completed, and the welded part of the irregular-section aluminum pipe and the stainless steel pipe is put into a hot isostatic pressure furnace for heat treatment to obtain an irregular-section composite pipe. The irregular-section composite pipes produced through the invention have the advantages that the weight is light, the strength is high, the thermal expansion efficiency is high, the interfacial metallurgical bonding ratio is close to 100 percent, the interfacial heat exchange coefficient is high, the bonding strength is high, the service life in severe cold-and-hot-alternation environment and the like, can be used in heat pipe systems which are key technical hardware of aircrafts, aerospacecrafts and other spacecrafts, and can be widely used in fields such as power, electronics, ships, nuclear energy and the like.

Description

technical field [0001] The invention belongs to the technical field of metal composite materials, in particular to a method for preparing composite pipes with special-shaped cross-sections. Background technique [0002] Based on strength, corrosion resistance and other considerations, the special-shaped cross-section composite heat pipe shell (the circulation pipeline and storage container of the working medium) is made of stainless steel. The hot end and cold end of the heat pipe are the heat collection and dissipation parts. Based on the heat transfer performance and weight considerations, the aluminum alloy material with light weight, good heat transfer performance and large specific heat capacity is selected. In actual use, the heat flux at the interface between the stainless steel tube and the aluminum alloy can reach several watts per square centimeter. At present, composite heat pipes prepared by mechanical bonding or filling with thermal grease, thermal adhesive, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P17/00B21C23/02C23C18/31C25D3/00C21D9/00C22F1/04
Inventor 张小勇陆艳杰楚建新
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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