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Short process high efficiency preparation method of high aluminium coppe alloy precision pipe material

A copper alloy and precision tube technology, applied in the field of non-ferrous metal new material preparation, can solve the problems of high aluminum copper alloy precision tube complex process, low yield, product quality and performance difficult to meet the requirements of use, etc., and achieve excellent cold working deformation ability. , the effect of improving mechanical properties and physical properties

Inactive Publication Date: 2007-07-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a short-process high-efficiency preparation method for high-aluminum copper alloy precision pipes, which solves the problems of conventional preparation of high-aluminum copper alloy precision pipes, such as complicated process, low yield, and difficult product quality and performance to meet the use requirements. A preparation method for continuous directional solidification of high-aluminum copper alloy precision pipes, the method is simple in process, and can prepare pipes with an outer diameter of 8-40mm and a wall thickness of 1-5mm

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: a Cu-14.3wt%Al-4wt%Ni shape memory alloy pipe with an outer diameter of 10mm and a wall thickness of 1.5mm. Oxygen-free copper with a copper content of 99.9%, pure aluminum with an aluminum content of 99.9%, and pure nickel with a nickel content of 99.99% are used as raw materials, wherein the mass fraction of the aluminum content is 14.3%, and the mass fraction of the nickel content is 4%. First, oxygen-free copper, pure aluminum and pure nickel are melted at 1480°C. When the cooling water volume is 1300L / h, the cooling water temperature is 28°C, and the vacuum degree is 0.1Pa, the continuous directional solidification equipment is 38mm thick by the down-draw method. / min to prepare a pipe with an outer diameter of 10mm and a wall thickness of 1.5mm. The inner and outer surfaces of the prepared pipe are bright, and the interior is a continuous columnar crystal structure, and the diameter of the columnar crystals is about 0.25-1.5mm.

Embodiment 2

[0010] Example 2: a Cu-7wt%Al aluminum bronze alloy pipe with an outer diameter of 12 mm and a wall thickness of 1.8 mm. Oxygen-free copper with a copper content of 99.9% and pure aluminum with an aluminum content of 99.9% are used as raw materials, wherein the mass fraction of the aluminum content is 7%. First, oxygen-free copper and pure aluminum are melted at 1220°C. When the cooling water volume is 900L / h, the cooling water temperature is 30°C, and the vacuum degree is 0.5Pa, the continuous directional solidification equipment is 100mm / min using the down-draw method. A pipe with an outer diameter of 12 mm and a wall thickness of 1.8 mm was prepared at the drawing speed. The inner and outer surfaces of the prepared pipe are bright, and the interior is a continuous columnar crystal structure, and the diameter of the columnar crystals is about 0.5-1.8 mm.

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Abstract

The present invention relates to a short-process high-effective preparation method of high-aluminium copper alloy precision pipe material. It is characterized by adopting a continuous unidirectional solidification method to prepare the high-aluminium copper alloy precision pipe material, its preparation process includes the following steps: melting copper alloy ingot with high aluminium content or oxygen-free copper and pure aluminium (for alloy containing more than three components, it also includes other alloy element, for example nickel) at 1150-1550 deg.C, continuous unidirectional solidification billet-drawing speed is 1-200 mm / min, cooling water rate is 100-1300 L / h, cooling water temperature is 20-30 deg.C and degree of vacuum is 0.1-2Pa, preparing the high-aluminium copper alloy precision pipe material whose outer diameter is 8-40 mm and wall thickness is 1-5 mm.

Description

technical field [0001] The invention belongs to the technical field of preparation of new nonferrous metal materials, and in particular provides a short-process and high-efficiency preparation method of high-aluminum copper alloy precision pipes. Background technique [0002] Aluminum-containing copper alloy precision tubes have excellent physical and mechanical properties and corrosion resistance, and are widely used in the fields of electronic information, machinery, aerospace, transportation, construction, chemical medicine, energy, home appliances and daily necessities. . However, when the aluminum content in the copper alloy is relatively high (mass fraction of aluminum ≥ 7%), the alloy has problems such as low plasticity and difficult processing, which leads to complex preparation and processing technology, low yield, and high cost of precision pipes, which are serious This restricts the further popularization and application of copper alloy precision pipes with high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/11
Inventor 刘雪峰谢建新李卫河
Owner UNIV OF SCI & TECH BEIJING
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