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Method for manufacturing foam stainless steel composite tube

A foamed stainless steel and stainless steel tube technology, applied in the field of powder metallurgy, can solve the problems of lack of preparation method of sintered metal porous materials, high consumption of raw materials, small surface area of ​​heat exchange tubes, etc. Low consumption effect

Active Publication Date: 2014-11-19
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing heat exchange tubes mainly have the defect of small surface area, which leads to large volume of heat exchange tubes and high consumption of raw materials. There is a lack of a method for preparing sintered metal porous materials that can be used for efficient heat exchange in the prior art

Method used

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  • Method for manufacturing foam stainless steel composite tube
  • Method for manufacturing foam stainless steel composite tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the foam stainless steel composite pipe of the present embodiment comprises the following steps:

[0028] Step 1, dissolving polyvinyl butyral in absolute ethanol to obtain a dispersant; the mass percentage of polyvinyl butyral in the dispersant is 0.2%;

[0029] Step 2, adding stainless steel powder into the dispersant described in step 1, and stirring evenly to obtain a stainless steel powder slurry; the average size of the stainless steel powder is 3 μm, and the mass percentage of the stainless steel powder in the stainless steel powder slurry is 50 %;

[0030] Step 3: Evenly coat the stainless steel powder slurry described in step 2 on the outer surface of a stainless steel pipe with a length of 100 mm, an outer diameter of 6 mm, and a wall thickness of 1 mm. After drying, apply the stainless steel powder slurry under vacuum conditions. The stainless steel tube of the raw material is heat-treated, and a layer of stainless steel powder sint...

Embodiment 2

[0034] The preparation method of the foam stainless steel composite pipe of the present embodiment comprises the following steps:

[0035] Step 1, dissolving polyvinyl butyral in absolute ethanol to obtain a dispersant; the mass percentage of polyvinyl butyral in the dispersant is 0.1%;

[0036] Step 2, adding stainless steel powder into the dispersant described in step 1, and stirring evenly to obtain a stainless steel powder slurry; the average size of the stainless steel powder is 1.5 μm, and the mass percentage of the stainless steel powder in the stainless steel powder slurry is 70%;

[0037] Step 3. Evenly coat the stainless steel powder slurry described in step 2 on the outer surface of a stainless steel pipe with a length of 100 mm, an outer diameter of 50 mm, and a wall thickness of 3 mm. After drying, apply the stainless steel powder slurry under vacuum conditions. The stainless steel tube of the raw material is heat-treated, and a layer of stainless steel powder si...

Embodiment 3

[0041] The preparation method of the foam stainless steel composite pipe of the present embodiment comprises the following steps:

[0042] Step 1, dissolving polyvinyl butyral in absolute ethanol to obtain a dispersant; the mass percentage of polyvinyl butyral in the dispersant is 0.3%;

[0043] Step 2, adding stainless steel powder into the dispersant described in step 1, and stirring evenly to obtain a stainless steel powder slurry; the average size of the stainless steel powder is 10 μm, and the mass percentage of the stainless steel powder in the stainless steel powder slurry is 20 %;

[0044] Step 3. Evenly coat the stainless steel powder slurry described in step 2 on the outer surface of a stainless steel tube with a length of 100 mm, an outer diameter of 30 mm, and a wall thickness of 1.5 mm. The stainless steel tube of the slurry is heat-treated, and a layer of stainless steel powder sintered porous layer is obtained on the outer surface of the stainless steel tube; t...

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Abstract

The invention discloses a method for manufacturing a foam stainless steel composite tube. The method includes the first step of preparing a dispersant, the second step of preparing stainless steel powder slurry, the third step of evenly coating the stainless steel powder slurry on the outer surface of a stainless steel tube, carrying out heat treatment after drying and obtaining a stainless steel powder sintered porous layer, the fourth step of covering the surface of the stainless steel powder sintered porous layer with a foam formwork, evenly applying the stainless steel powder slurry to the foam formwork, carrying out heat treatment after drying and obtaining a stainless steel foam layer, namely obtaining the foam stainless steel composite tube. According to the method, raw materials are wide in source range and easy to obtain, the manufacturing process is simple, the heat conductivity coefficient of the obtained foam stainless steel composite tube is reduced by more than 10 times compared with that of a stainless steel bare tube, critical heat flux density is improved more than twice, the specific area is large, and the foam stainless steel composite tube has the advantages of being good in machining performance, little in raw material consumption, large in heat exchange specific area and stable in repetitive use performance and can serve as a key part of a radiator.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of a foamed stainless steel composite pipe. Background technique [0002] As the core element that determines the heat exchange efficiency of heat exchangers, the design and development of heat exchange tubes have been widely valued in all countries in the world. my country also attaches great importance to the development of industrial energy-saving technology and equipment, but in the research and development and In terms of industrialization, there is still a considerable gap with the international advanced level. Therefore, my country's high-efficiency heat exchange tubes have long relied on imports, which restricts the development of energy, iron and steel metallurgy, and petrochemical industries. Therefore, the modern industry has higher and higher requirements for heat exchangers, and there is an urgent need to find new types of hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/12B22F3/11
Inventor 李广忠李纲康新婷李亚宁迟煜頔沈垒
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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