Manufacturing method of heat conduction copper pipe with inner groove

A manufacturing method and technology of heat-conducting copper tubes, applied in the field of powder metallurgy, can solve problems such as high cost, poor thermal conductivity, and complicated methods, and achieve the effects of low production cost, simple steps, and broad application prospects

Inactive Publication Date: 2016-03-09
SHENZHEN ELEMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is more complex, costly, and has poor thermal conductivity.

Method used

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  • Manufacturing method of heat conduction copper pipe with inner groove
  • Manufacturing method of heat conduction copper pipe with inner groove

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 40vol.% of polymer binder (50wt.% of PW, 45wt.% of PE and 5wt.% of SA) to the copper powder with particle size D50 of 10 μm. The metal powder is heated to 160°C, and then PW, PE and SA are gradually added. After mixing evenly, the granular feed is made by a granulator. Formed by an extruder at 120°C to produce a tubular green body with an inner groove (inner diameter? 16mm, outer diameter? 20mm), and then cut the tubular green body into a length of 300mm. Soak the green body in a n-hexane solution at 40°C and keep it warm for 24 hours to degrease the solvent. Then take out the green body, put it into the degreasing sintering furnace after drying. Pass flowing argon into the debinding sintering furnace, and remove the remaining binder by thermal debinding at 450°C. Then the temperature was gradually raised to 850°C, and the temperature was lowered after sintering for 2 hours. The result is a dense copper tube with internal grooves.

Embodiment 2

[0029] Add 40vol.% polymer binder (86wt%POM, 6wt%PE, 6wt%EVA and 2wt%SA) to the copper powder with a particle size D50 of 10μm, and put the metal powder in the internal mixer Heat to 180°C, then gradually add PW, PE and SA. After mixing evenly, the granular feed is made by a granulator. Formed by an extruder at 160°C to produce a tubular green body with an inner groove (inner diameter? 16mm, outer diameter? 20mm), and then cut the tubular green body into a length of 300mm. The green body is degreased with oxalic acid in a degreasing furnace. Then put into the degreasing sintering furnace. Flowing argon gas is introduced into the debinding sintering furnace, and the remaining binder is removed by thermal debinding at 500°C. Then the temperature was gradually raised to 800°C, and the temperature was lowered after sintering for 3 hours. The result is a dense copper tube with internal grooves.

[0030] The patent of the present invention proposes a method of manufacturing hea...

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Abstract

The invention relates to the field of powder metallurgy, and particularly discloses a manufacturing method of a heat conduction copper pipe with an inner groove. The method comprises the following steps that firstly, feed is prepared, a macromolecule bonding agent and copper powder are mixed evenly in an internal mixer, and pelleting is carried out to obtain the feed with the even structure; secondly, extrusion forming and cutting are carried out, the feed passes a die in a specific shape through a single screw extruder, a tubular sectional bar green body with the inner groove is obtained through extrusion, and the tubular sectional bar green body is cut to the needed length; thirdly, degreasing is carried out, and the green body is degreased through a solvent degreasing or catalysis degreasing method; and fourthly, sintering is carried out, a degreasing sintering furnace is used for thermal degreasing, the last part of bonding agent is made to be removed from the green body, and a sample is heated and sintered in the protection atmosphere to obtain the heat conduction copper pipe with the inner groove. According to the method, the advantages of the plastic extrusion forming technology and the advantages of the powder metallurgy technology are combined, and heat conduction copper pipes with inner grooves can be efficiently produced on a large scale.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a method for manufacturing a heat-conducting copper tube with inner grooves. Background technique [0002] Thermally conductive copper tubes have high thermal conductivity and corrosion resistance, and are widely used in air conditioners, refrigerators, and heat dissipation elements of electronic components. At present, copper pipes are generally obtained by direct hot extrusion of copper profiles or continuous casting. Chinese patent (Application No.: 200510017984.5) obtains copper tubes with a red surface by hot extrusion of copper profiles at 600-860 °C, and then through pickling and bright annealing processes. The Chinese patent (application number: 200710065281.9) melts the copper alloy at 1150~1300°C, and then manufactures precision pipes by continuous casting. [0003] In order to improve the conduction of heat through the heat-conducting copper tube, the inner wall of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/12
CPCB22F5/106
Inventor 余鹏吕永虎顾道敏
Owner SHENZHEN ELEMENT TECH CO LTD
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