Method for simultaneously improving intensity, ductility and abrasion resistance of copper-tin alloys

A technology of copper-tin alloy and wear resistance, which is applied in the field of material preparation, can solve the problems of surface fatigue failure of parts, parts are easy to break, and the service life is not high, so as to achieve fine microstructure, excellent casting performance and simple composition Effect

Active Publication Date: 2020-09-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cast tin bronze has the advantages of high strength, low friction coefficient, good wear resistance and corrosion resistance, and is often used to manufacture bushings, bushings and other parts used in rolling wear conditions. Strong friction causes parts to break easily during operation. How to improve their strong plasticity and wear resistance has always been a research and application hotspot
However, with the rapid development of technology in the fields of high-speed rail, ships, etc., traditional tin bronze cannot meet the requirements of increasingly demanding working conditions, and element segregation causes surface fatigue failure or fracture of components, resulting in short service life

Method used

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  • Method for simultaneously improving intensity, ductility and abrasion resistance of copper-tin alloys
  • Method for simultaneously improving intensity, ductility and abrasion resistance of copper-tin alloys
  • Method for simultaneously improving intensity, ductility and abrasion resistance of copper-tin alloys

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Experimental program
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Effect test

Embodiment 1

[0020] The material composition described in this embodiment is CuSn10Fe2P1 (wt.%), and the specific preparation method is as follows:

[0021] (1) Weigh about 5kg of pure copper, copper-tin master alloy, copper-iron master alloy, and copper-phosphorus master alloy, and use an intermediate frequency induction heating furnace to heat the alloy rapidly to 1350°C for 10min, then air-cool to 1080°C (liquidus line 1028 °C) for degassing and slag removal and standing for 3 minutes to homogenize the internal temperature field of the alloy melt.

[0022] (2) Adjust the angle of the melt confinement flow induction nucleation device to 60°, the length of the melt confinement channel is 400mm, the flow rate of the upper and lower circulation cooling water is 500L / h, the collection crucible is preheated to 990°C, and the melt The cooling rate is about 400°C / s and the subcooling degree is about 20°C.

[0023] (3) The melt with a uniform temperature field is poured into the restricted cool...

Embodiment 2

[0029] The material composition described in this embodiment is CuSn8Fe1P0.8 (wt.%), and the specific preparation method is as follows:

[0030] (1) Weigh about 6kg of pure copper, copper-tin master alloy, copper-iron master alloy, and copper-phosphorus master alloy, heat the alloy rapidly to 1380°C for 20min in an intermediate frequency induction heating furnace, and then air cool to 1100°C (liquidus line 1028 °C) for degassing and slag removal and standing for 5 minutes to homogenize the internal temperature field of the alloy melt.

[0031] (2) Adjust the angle of the melt confinement flow induction nucleation device to 45°, the length of the melt confinement channel is 300mm, the flow rate of the upper and lower circulation cooling water is 600L / h, the collection crucible is preheated to 980°C, and the melt is cooled during the melt treatment The rate is about 2000°C / s and the degree of subcooling is about 50°C.

[0032] (3) The melt with a uniform temperature field is po...

Embodiment 3

[0039] The material composition described in this embodiment is CuSn14Fe6P1.2 (wt.%), and the specific implementation steps are as follows:

[0040] (1) Weigh about 8 kg of pure copper, copper-tin master alloy, copper-iron master alloy, and copper-phosphorus master alloy, rapidly heat the alloy to 1300°C for 3 minutes in a medium-frequency induction heating furnace, and then air-cool to 1050°C (liquidus line 1028 °C) degassing and slag removal and standing for 1min to make the internal temperature field of the alloy melt uniform;

[0041] (2) Adjust the angle of the melt confinement flow induction nucleation device to 50°, the length of the melt confinement channel is 350mm, the flow rate of the upper and lower circulation cooling water is 550L / h, and the collection crucible is preheated to 970°C. The cooling rate is about 800°C / s and the subcooling degree is about 100°C.

[0042] (3) The melt with a uniform temperature field is poured into the restricted cooling channel for ...

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Abstract

The invention discloses a method for simultaneously improving intensity, ductility and abrasion resistance of copper-tin alloys, and belongs to the technical field of material preparation. The methodcomprises the steps of preparing raw materials of 8-15% of Sn,1-8% of Fe, 0.8-1.2% of P, and the balance Cu, placing the raw materials in a medium frequency induction heating furnace, performing heating for melting, then treating molten mass by a quick cooling method, controlling the cooling rate and the supercooling degree of the molten mass, and adjusting and controlling the proportion of nanoscale iron enriched phases and intercrystalline micron order iron enriched phases in a primary phase. The intensity and the ductility of the alloys are reinforced by using the nanoscale iron enriched phase, the abrasion resistance of the alloys is improved by an intercrystalline micron order iron enriched phase, and through controlling the proportion of the nanoscale iron enriched phase to the micron order iron enriched phase, high-strength high-ductility high-wear-resistance copper-tin alloys are obtained. The alloys are simple in components, the preparation technology is short in technologicalprocesses, the method is low in cost, castings are good in properties, and the method is suitable for fields of high speed rails, heavy trucks, aerospace and the like, and has favorable application prospects.

Description

technical field [0001] The invention relates to a method for simultaneously improving the strength, plasticity and wear resistance of a copper-tin alloy, which belongs to the technical field of material preparation. Background technique [0002] Cast tin bronze has the advantages of high strength, low friction coefficient, good wear resistance and corrosion resistance, and is often used to manufacture bushings, bushings and other parts used in rolling wear conditions. Strong friction causes parts to break easily during operation. How to improve their strong plasticity and wear resistance has always been a research and application hotspot. However, with the rapid development of technology in high-speed rail, ships and other fields, traditional tin bronze cannot meet the requirements of increasingly harsh working conditions, and element segregation causes parts to be prone to surface fatigue failure or fracture, resulting in a short service life. Therefore, in order to meet t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C9/02
CPCC22C1/03C22C9/02
Inventor 李永坤周荣锋伍星
Owner KUNMING UNIV OF SCI & TECH
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