Method for preparing thermally-sprayed iron-based powder porous surface heat exchange tube

A technology of iron-based powder and porous surface, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the problems of deterioration of matrix pipe structure, difficulty in meeting heat exchange tubes, and reduction of mechanical properties, etc., to achieve lower temperature , low cost, and the effect of increasing porosity

Active Publication Date: 2011-10-26
WUXI CHEM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this sintering processing method has a high porosity of 30-70% in the porous layer, the process is complex, the processing cycle is long, the energy consumption is large, and the cost is high; The structure of the base tube deteriorates, the mechanical properties decrease, and it is difficult to meet the relevant standards for heat exchange tubes

Method used

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  • Method for preparing thermally-sprayed iron-based powder porous surface heat exchange tube
  • Method for preparing thermally-sprayed iron-based powder porous surface heat exchange tube
  • Method for preparing thermally-sprayed iron-based powder porous surface heat exchange tube

Examples

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Effect test

Embodiment 1

[0028] The particle size of the iron-based alloy powder is 140-200 mesh, and the particle size of the nickel-coated aluminum powder is 140-250 mesh. The iron-based alloy powder, nickel-coated aluminum powder and spraying additive are uniformly mixed in a weight ratio of 6:1:3 to form a mechanized alloy powder. First rotate the tube substrate horizontally at a speed of 400 rpm; preheat the tube substrate with a micro-carbonization flame, and control the preheating temperature at 90-110°C. Then spray nickel-clad aluminum powder on the preheated pipe substrate to form a base layer with a thickness of 0.12mm, and finally use a micro-carbonization flame at 750-900°C to spray mechanized alloy powder. (Strictly control various operating parameters during the spraying process. The pipe substrate must not exceed 200°C, and the thickness of each spraying must not exceed 0.09mm. The final thickness of the coating is determined by the number of sprayings.) Finally, a porous surface coatin...

Embodiment 2

[0032] The particle size of the iron-based alloy powder is 250-300 mesh, and the particle size of the nickel-coated aluminum powder is 250-325 mesh. The iron-based alloy powder, nickel-coated aluminum powder and spraying additive are uniformly mixed in a weight ratio of 7:1:3 to form a mechanized alloy powder. First rotate the tube substrate horizontally at a speed of 500 rpm; preheat the tube substrate with a micro-carbonization flame, and control the preheating temperature at 90-100°C. Then spray nickel-clad aluminum powder on the preheated pipe substrate to form a base layer with a thickness of 0.10mm, and finally spray the mixed powder with a micro-carbonization flame at 650-900°C. (Strictly control various operating parameters during the spraying process. The pipe substrate must not exceed 180°C, and the thickness of each spraying must not exceed 0.08mm. The final thickness of the coating is determined by the number of sprayings.) Finally, a porous surface coating with a ...

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Abstract

The invention relates to a method for preparing a thermally-sprayed iron-based powder porous surface heat exchange tube. The heat exchange tube consists of a tube matrix and a surface porous layer, wherein the surface porous layer uses iron or iron alloy finely-grained powder as a main ingredient, contains a certain proportion of nickel-coated aluminum powder and spray accessories and is formed by thermal spray; the surface porous layer is positioned on the outer surface of a tube; and the inner surface of the tube is smooth or has a longitudinal groove structure with reinforcing and condensing functions. The preparation method comprises: mixing the iron-based alloy powder, the nickel-coated aluminum powder and the spray accessories in a certain proportion to prepare mechanical alloyed powder; and spraying the mechanical alloyed powder by using oxygen-ethyne flame onto the surface of a preprocessed metal tube at a certain angle to form the iron-based alloy powder metal porous layer. The method has the advantages of no addition of a pore-forming material, simple process, high processing efficiency, low cost and capacity of meeting requirements for industrial application.

Description

【Technical field】 [0001] The invention relates to the field of heat exchange tubes and their manufacture, in particular to a preparation method of thermal spraying iron-based powder porous surface heat exchange tubes. 【Background technique】 [0002] Heat exchangers are widely used in oil refining, petrochemical and other industries, and their investment generally accounts for 30% to 40% of the total investment. Therefore, it is of great engineering value to improve the heat transfer efficiency of heat exchangers and reduce energy consumption by enhancing heat transfer. At present, the main method to enhance boiling heat transfer is to improve the heat transfer surface structure. Commonly used surface structures include grooves, ribs and porous surfaces of various shapes. Among them, the porous surface heat exchange tube developed since the 1960s has become a heat exchange element with a wide range of industrial applications due to its high-efficiency boiling heat transfer,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/08C23C4/02C23C4/16C23C4/06C23C4/129
Inventor 徐宏曾勇侯峰戴玉林闫操姚志燕曹洪海
Owner WUXI CHEM EQUIP CO LTD
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