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Low temp sintering method for surface porous pipe

A surface porous tube and low-temperature sintering technology, which is applied in the field of preparation of sintered surface porous tubes, can solve the problems of powder sintering, high temperature strength reduction, deformation increase, etc., and achieve the effect of reducing the sintering temperature

Inactive Publication Date: 2003-10-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For steel, its eutectoid transformation temperature is 723°C. When the powder layer is sintered on the steel pipe, the steel will undergo a phase transformation, which will lead to a change in the structure, a decrease in high-temperature strength, and an increase in deformation.
In addition, it is difficult to mix the two powders evenly, and after sintering, the local adhesion of the powder is not strong, and it will fall off
Experiments have found that the phosphorus element in phosphor copper powder has a poisonous effect on copper powder. It is impossible to sinter the powder to the copper tube at 850°C or even higher temperature, and it will also cause pollution to the sintering furnace.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] -100~+160 mesh atomized copper tin powder containing 10% tin, adhered to a Φ22×2mm long 210mm copper tube with 20% polystyrene xylene solution, and heated at a rate of 200°C / h to 450°C Keep it warm for 20 minutes, then raise the temperature at 300°C / h to 670°C and keep it warm for 60 minutes, cool it to 300°C in the furnace, and then take it out of the furnace for water cooling. The sintered layer adheres firmly, the measured porosity is 70%, the equivalent pore size is 52 μm, the thickness of the porous layer is 0.5 mm, and the heat transfer coefficient measured by acetone is 8.2 times that of a light tube with the same diameter.

Embodiment 2

[0017] -200~+250 mesh atomized copper tin powder containing 12% tin, adhere to Φ22×2mm long 210mm 20g steel pipe with 15% polyisobutylene xylene solution, heat up at 200℃ / h to 450 ℃ for 20 minutes, then heated at 300℃ / h to 700℃ for 90 minutes, cooled to 130℃ in the furnace, and then air-cooled. The sintered layer adheres firmly, the measured porosity is 63%, the equivalent pore size is 47 μm, and the thickness of the porous layer is 0.37 mm. The heat transfer coefficient measured by acetone is 6.4 times that of a light tube with the same diameter.

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PUM

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Abstract

The low-temp. sinterring method of surface perforated pipe includes the following steps: brushing base component required for sintering perforated layer with glue liquor, spraying the alloy copper tin powder on the base component brushed with glue liquor, after dried placing said base component into heating furnace with protective atmosphere, introducing hydrogen gas to make protection and heating to 400-500 deg.C, heat-insulating for 5-30 min., then quickly heating to 670-700 deg.C and heat-insulating for 60-90 min., and cooling under the protective atmosphere so as to can obtain the invented surface perforated pipe. The tin content in the described alloy copper tin powder is 9-13 wt%.

Description

technical field [0001] The invention relates to a preparation method of a sintered surface porous tube. Background technique [0002] The sintered surface porous tube has good boiling heat transfer ability, and its heat transfer coefficient can reach 6-8 times that of the same smooth tube, so it has great application prospects in the field of heat transfer. However, the current method of producing porous tubes requires The sintering temperature is very high, and the temperature is too high, which will cause changes in the structure of the base pipe, reduce the mechanical properties, cause large deformation, and affect the use; in addition, the high sintering temperature will also cause a lot of energy consumption and reduce the life of the equipment, and the requirements for equipment parameters are too high The investment is too large, which limits the wide application of the surface porous tube. Patent U.S.P.3821018 introduces a method of mixing and sintering phosphor cop...

Claims

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Application Information

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IPC IPC(8): B22F3/11B22F5/12B22F7/04C22C9/02
Inventor 刘宽宏徐宏黄志荣侯峰郭良辉
Owner EAST CHINA UNIV OF SCI & TECH
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