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Method for preparing copper/phosphorus double-metal capillary tube

A capillary, bimetallic technology, applied in the field of copper/phosphorus bimetallic capillary preparation, can solve the problems of reduced instrument reliability, low phosphorus thermal conductivity, uneven thickness of phosphorus layer, etc., and achieves low production cost and good surface quality. , the effect of high dimensional accuracy

Active Publication Date: 2014-11-12
枣庄铭世新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in places with strong seawater corrosion such as ships, seawater desalination and coastal power stations, copper and copper alloy capillary tubes will shorten their service life due to seawater corrosion and reduce the reliability of the instrument.
Pure phosphorus capillary has extremely good corrosion resistance, but the thermal conductivity of phosphorus is low, the heat exchange performance of thick-walled capillary is poor, and the mechanical properties of thin-walled capillary are difficult to meet the use requirements
[0003] At present, the preparation methods of copper / phosphorus composite pipes mainly include: Czochralski composite, hydraulic bulging composite and explosive welding, etc., which are usually realized by obtaining a small amount of plastic deformation of the base material or the base and cladding materials to obtain an interference fit. Composite, the interface bonding strength of the prepared composite tube is low, the deformation coordination of the double-layer metal is poor, it is difficult to make a capillary, especially the thickness of the phosphorus layer is uneven, and it is difficult to ensure the thickness of the phosphorus layer after the capillary is made.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: A processing method for a copper / phosphorus bimetallic capillary with a size of Φ3.0 mm×1.5 mm.

[0017] Put a TA2 pure phosphorus tube with a size of Φ12.7mm×1.55mm into a T2 copper tube with a size of Φ19.0mm×2.0mm, insert a mandrel coated with mineral oil, and perform 3 passes with a section reduction rate of about 20%. Cold swaging to produce a copper / phosphorus composite pipe with a size of Φ14.1mm×1.3mm. Under the protection of argon, the composite tube was subjected to diffusion annealing treatment at 950°C for 10 minutes to form a metallurgical bond at the interface. After the diffusion treatment, the composite pipe was subjected to 5 passes of straight pulling with the moving core to obtain a Φ7.2mm×0.7mm composite pipe, and after annealing at 500°C for 1h, the moving core was pulled continuously for 5 passes to obtain a Φ3. 0mm×1.5mm copper / phosphorus bimetallic capillary. The section reduction rate of the straight pull pass is between 10% and ...

Embodiment 2

[0018] Embodiment 2: A processing method for a copper / phosphorus alloy bimetallic capillary with a size of Φ2.0mm×0.4mm.

[0019] Put the phosphorus alloy tube with the size of Φ12.0mm×1.5mm into the T2 copper tube with the size of Φ15.0mm×1.4mm, insert the mandrel coated with mineral oil, and carry out 4 passes of cooling with the section reduction rate of about 20%. Swivel forging to produce a copper / phosphorus alloy composite tube with a size of Φ11.0mm×1.0mm. Under the protection of argon, the composite tube was subjected to diffusion annealing at 920°C for 30 minutes to form a metallurgical bond at the interface. After the diffusion treatment, the composite pipe is straight-drawn by the moving core head for 5 times to obtain a composite pipe of Φ5.5mm×1.5mm, annealed at 500°C for 1 hour, and then pulled by the moving core head for 5 times to obtain a composite pipe of Φ2mm. ×0.4mm copper / phosphorus alloy bimetallic capillary. The section reduction rate of the straight p...

Embodiment 3

[0020] Embodiment 3: A processing method for a copper / phosphorus bimetallic capillary with a size of Φ1.5 mm×0.1 mm.

[0021] Put a TA2 pure phosphorus tube with a size of Φ8.0mm×0.4mm into a T2 copper tube with a size of Φ10.0mm×0.9mm, insert a mandrel coated with mineral oil and perform 5 passes with a section reduction rate of about 20%. Cold swaging to produce a copper / phosphorus composite pipe with a size of Φ9.0mm×0.6mm. Under the protection of argon, the composite pipe was subjected to diffusion annealing treatment at 900°C for 60 minutes to form a metallurgical bond at the interface. After the diffusion treatment, the composite pipe is pulled by the moving core head 4 times to obtain a Φ4.0mm×0.3mm composite pipe; after annealing at 500°C for 1h, the Φ2 .0mm×0.15mm composite tube; after annealing at 500°C for 1h, it will be drawn into a Φ1.5mm×0.1mm copper / phosphorus bimetallic capillary through 7 passes (an intermediary at 500°C for 1h is required during this period)...

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PUM

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Abstract

The invention belongs to the technical field of preparation of metal composite capillary tubes and relates to a method for preparing a copper / phosphorus double-metal capillary tube. The method comprises the following steps: performing rotary swaging to realize close combination of a copper tube and a phosphorus tube, performing high-temperature diffusion annealing treatment to obtain a copper / phosphorus composite tube with the interface achieving a metallurgical bonding state, performing drawing or / and non-mandrel drawing by adopting a floating core head and performing intermediate annealing cooperatively to obtain the high-performance copper / phosphorus double-metal capillary tube. According to the method, by combining drawing and non-mandrel drawing of the floating core head, cooperating with the necessary intermediate annealing, the obtained composite capillary tube is high in size precision and good in surface quality. Through sequential diffusion annealing and drawing processing, deformation force needed by forming is small, the service life of tools and molds is long, driving force needed by equipment is small, and production cost is low.

Description

Technical field: [0001] The invention relates to the technical field of preparing metal composite capillary tubes, and in particular provides a method for preparing copper / phosphorus bimetallic capillary tubes. technical background: [0002] Copper and copper alloy capillary tubes are a type of pipe with a small diameter and a thin wall thickness in the specification range of Φ(1.5~6.1)mm×(0.1~0.8)mm (outer diameter×wall thickness, the same below). , an important raw material widely used in modern household appliances, instruments and meters. It is characterized by high processing difficulty and high added value. With the rapid development of my country's equipment manufacturing industry, home appliance industry and marine industry, the market demand for copper and copper alloy capillary tubes is increasing. However, in places with strong seawater corrosion environments such as ships, seawater desalination and coastal power stations, copper and copper alloy capillary tubes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 谢光玉
Owner 枣庄铭世新型材料有限公司
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