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Preparation and use method of alloy powder for sintered high-flux heat exchange tube

An alloy powder, high-throughput technology, applied in the field of metal materials, can solve the problems of low powder proportion and increased powder manufacturing cost, and achieve high oxidation resistance and corrosion resistance, low sintering temperature, and excellent anti-coking performance Effect

Active Publication Date: 2019-04-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of alloy powders for surface sintering mainly adopts the method of ordinary gas atomization, which can obtain powders with good sphericity, but the proportion of powders with a particle size larger than 200 mesh (70 μm) is relatively low, resulting in an increase in powder manufacturing costs.

Method used

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  • Preparation and use method of alloy powder for sintered high-flux heat exchange tube

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: Preparation particle diameter 70-140 μ m, composition is the alloy powder of Fe-26wt%Al-2wt%Cr-2wt%B

[0011] Adopt 50kg vacuum induction melting furnace to prepare alloy ingot, carry out batching according to alloy ingot 40kg, according to design composition Fe-26wt%Al-2wt%Cr-2wt%B, pure iron should add 28kg, pure Al adds 10.4kg, pure Add 0.8kg of Cr, add 0.8kg of pure B, and cast it into an alloy ingot with a diameter of 62mm by vacuum induction melting, and then process it into an electrode rod with a diameter of 60mm and a length of 700mm, and then use the rotary plasma milling technology for powder preparation. The current intensity of the plasma arc is 1100A, the voltage is 75V, the distance between the plasma gun and the electrode rod is 20cm, the rotation speed is 350 rpm, and the vacuum degree is less than 4.5×10 -3 Pa, finally sieve the prepared powder, keep the powder with a particle size of 70-140 μm, and process the rest as waste powder. The ...

Embodiment 2

[0012] Example 2: Preparation of alloy powder with a particle size of 70-140 μm and a composition of Fe-30wt%Al-1wt%Cr-3wt%B

[0013] Adopt 50kg vacuum induction melting furnace to prepare alloy ingot, carry out batching according to alloy ingot 40kg, according to design composition Fe-26wt%Al-2wt%Cr-2wt%B, pure iron should add 26.4kg, pure Al adds 12kg, pure Add 0.4kg of Cr, add 1.2kg of pure B, and cast it into an alloy ingot with a diameter of 62mm by vacuum induction melting, and then process it into an electrode rod with a diameter of 60mm and a length of 700mm, and then use the rotary plasma milling technology for powder preparation. The current intensity of the plasma arc is 1300A, the voltage is 65V, the distance between the plasma gun and the electrode rod is 15cm, the speed is 450 rpm, and the vacuum degree is less than 4.5×10 -3 Pa, finally sieve the prepared powder, keep the powder with a particle size of 70-140 μm, and process the rest as waste powder. The yield ...

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Abstract

The invention discloses a method for preparing and using alloy powder for sintered high-flux heat exchange tubes, belonging to the field of metal materials. The main feature of high-flux heat exchange tubes is to manufacture metal porous layers on the outer or inner surfaces of metal-based tubes (including copper-nickel tubes, carbon steel tubes, and heat-resistant steel tubes, etc.), increasing the number of vaporization cores, which can significantly enhance boiling heat transfer. At present, the metal porous layer is mainly formed by coating metal powder on the surface of the substrate and then sintering. The metal powder used is mainly Cu-based or Cu-based or Fe-based alloy powder containing Ni with an average particle size of more than 70 μm. The particle size of the powder is large, resulting in low yield of powder prepared by gas atomization and high cost. The main component of the present invention is Fe-(26-30)wt%Al-(0-2Cr)wt%-(2-4)wt%B, the alloy powder has the characteristics of low sintering temperature, anti-oxidation, anti-coking, etc., and at the same time Plasma rotary atomization powder making technology is used for powder preparation, and the yield of powder with a particle size of 70μm-140μm reaches 80%. Combining the alloy composition and powder yield of the present invention, it has obvious cost advantage compared with the existing alloy powder in the market.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a method for preparing and using alloy powder for sintered high-flux heat exchange tubes. Background technique [0002] High-flux tube heat exchangers are high-efficiency heat exchangers for enhanced boiling heat transfer. Its main feature is to manufacture a metal porous layer on the outer surface or inner surface of the metal light pipe, which can realize high-efficiency heat transfer under low temperature difference. The core component of a high-flux heat exchanger is a high-flux heat exchange tube. The sintered high-flux tube refers to a high-efficiency heat exchange tube with a porous surface and a specific structure that is sintered on the surface of an ordinary heat exchange tube by powder metallurgy. . The cavities and pores of the surface porous layer are connected to each other, which can significantly enhance the boiling heat transfer, and the heat transfer effect can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/14C22C38/06C22C38/32
Inventor 任淑彬王凤林曲选辉
Owner UNIV OF SCI & TECH BEIJING