A kind of preparation method of copper/phosphorus bimetallic capillary

Abstract

The invention belongs to the technical field of metal composite capillary material preparation, and relates to a method for preparing a copper / phosphorus bimetallic capillary. The method is to use rotary forging to realize the tight combination of copper tube and phosphorus tube, and obtain a copper / phosphorus composite tube whose interface reaches a metallurgical bonding state through high-temperature diffusion annealing treatment; then use floating core drawing or / and empty drawing processing, Combined with intermediate annealing, a high-performance copper / phosphorus bimetallic capillary is obtained. The invention adopts the method of combining the drawing of the floating core head and the empty drawing, together with the necessary intermediate annealing, the obtained composite capillary has high dimensional accuracy and good surface quality. After diffusion annealing and drawing processing, the deformation force required for forming is small, the life of tools and molds is long, the driving force required for equipment is small, and the production cost is low.

Description

Technical field: [0001] The invention relates to the technical field of preparing metal composite capillary tubes, in particular, it provides a production method applicable to 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 capi...

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.