Sintering process of Cu-Ni alloy pipe with porous surface

A copper-nickel alloy and porous surface technology, applied in the field of porous surface tube preparation, can solve the problems of long holding time, high price, high equipment requirements, etc., and achieve the effect of improving bonding strength, improving uniformity and low cost

Inactive Publication Date: 2007-12-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercially available sintered porous surface tubes are expensive, and the sintering temperature is too high, about 1000°C, the holding time is long, generally 30-180min, and the equipment requirements are also high, so it is difficult for large-scale production in petrochemical enterprises. universal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A mixture of 200g polystyrene and solvent and 300g copper-nickel alloy powder is coated on the outer surface of the base tube copper-nickel alloy tube (BFe10-1-1) with a coating thickness of 0.25mm, and then the tube is rotated horizontally at a speed of 50rad / min, volatilize the volatile substances in the binder, dry it, and then pass reducing gas such as hydrogen in the sintering furnace, sinter at 700°C for 10min, and then drop the temperature to 40°C to obtain a copper-nickel alloy porous surface Tube; the thickness of the porous layer is 0.2 mm, the porosity is 70%, and the pore diameter is 70 μm.

[0014] In said copper-nickel alloy powder, the weight content of copper is 90%, the weight content of nickel is 10%, and the particle size is 300 mesh.

[0015] The boiling heat transfer coefficient measured with acetone is 14 times that of a smooth tube with the same diameter. Using electric heating water as the experimental medium, the boiling heat transfer coefficien...

Embodiment 2

[0018] A mixture of 200g polystyrene and solvent and 200g copper-nickel alloy powder is coated on the outer surface of the base tube copper-nickel alloy tube (BFe10-1-1) with a coating thickness of 0.5mm, and then the tube is rotated horizontally at a speed of 50rad / min, volatilize the volatile substances in the binder, dry it, and then pass reducing gas such as hydrogen in the sintering furnace, sinter at 850°C for 5min, and then drop the temperature to 40°C to obtain a copper-nickel alloy porous surface tube ; The thickness of the porous layer is 0.3 mm, the porosity is 60%, and the pore diameter is 80 μm.

[0019] In said copper-nickel alloy powder, the weight content of copper is 90%, the weight content of nickel is 10%, and the particle size is 200 mesh.

[0020] The boiling heat transfer coefficient measured with acetone is 10 times that of a smooth tube with the same diameter. Using electric heating water as the experimental medium, the boiling heat transfer coefficient...

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PUM

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Abstract

The present invention provides sintering process of Cu-Ni alloy pipe with porous surface. The process includes the following steps: mixing polystyrene-base adhesive and Cu-Ni alloy powder, coating the mixture powder onto the inner and outer surface of the base pipe in the thickness of 0.1-0.5 mm, rotating the pipe horizontally in the speed of 30-100 rad/min to volatilize the volatile matter of the adhesive and to dry, sintering in a sintering furnace with introduced H2 or other reductive gas at 650-850 deg.c for 5-20 min, and cooling to 40-50 deg.c to obtain Cu-Ni alloy pipe with porous surface. The Cu-Ni alloy pipe produced with composite powder has high porosity, high pore uniformity and high base strength, and the sintering process may be used in producing long porous pipe and is suitable for industrial production.

Description

technical field [0001] The present invention relates to a method for the preparation of porous surface tubes. Background technique [0002] Porous surface tubes have an efficient enhancement effect on boiling heat transfer. It can significantly enhance the boiling heat transfer of water, freon, liquid nitrogen, olefins, benzene, ethanol and other working fluids, and can be used in reboilers of light hydrocarbon processing towers in petrochemical plants and air separation units Main condenser-evaporator and natural gas liquefaction, refrigeration, air conditioning, ethylene glycol evaporation, seawater desalination, aerospace and other devices. There are many processing methods for porous surface tubes: such as electroplating, chemical corrosion, spraying, machining and sintering. Among them, the heat transfer performance of the sintered porous surface tube is obviously better than that of the porous surface tube manufactured by other methods, and the porous surface tube ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B22F3/11
Inventor 徐宏刘阿龙张莉
Owner EAST CHINA UNIV OF SCI & TECH
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