Nano intermetallic compound dispersion strengthened high-conductivity wear-resistant copper alloy and manufacturing method and application thereof

A dispersion-strengthening, nano-metal technology, applied in mechanical equipment, friction linings, etc., can solve the problem that the quality is difficult to meet the requirements of high-speed operation of standard EMUs, the uniformity of structure and properties and casting shrinkage, which affect the quality reliability and stability. and other problems, to achieve the effects of fine grain size, enlarged equiaxed grain area, and improved hardness

Active Publication Date: 2020-07-31
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current high-speed train motor friction discs of France's Mersen and Japan's Mitsubishi have problems such as low density, uniformity of structure and performance, and difficult to control defects such as casting shrinkage porosity and shrinkage cavity, which seriously affect the reliability and stability of their quality. sex
Although the two have occupied the main market of high-speed train motors with a speed of less than 300 kilometers per hour worldwide, the application test on the "Fuxing" train with a speed of 350 kilometers per hour in my country shows that its quality is still difficult to meet my country's standard high-speed train unit (CEMU). running requirements

Method used

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  • Nano intermetallic compound dispersion strengthened high-conductivity wear-resistant copper alloy and manufacturing method and application thereof
  • Nano intermetallic compound dispersion strengthened high-conductivity wear-resistant copper alloy and manufacturing method and application thereof
  • Nano intermetallic compound dispersion strengthened high-conductivity wear-resistant copper alloy and manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Test equipment and drugs

[0040] 1.1. Test equipment and test instruments

[0041] 1) JBW-300H instrumented impact testing machine;

[0042] 2) CMT5015 microcomputer-controlled universal testing machine;

[0043] 3) Vickers hardness tester;

[0044] 4) Metallographic microscope;

[0045] 5) scanning electron microscope;

[0046] 6) X-ray diffractometer;

[0047] 7) AztecX-Max50 energy spectrometer;

[0048] 8) Beaker, alcohol cotton, tweezers, sandpaper, polishing machine, ultrasonic cleaning machine;

[0049] 9) MFT-3000 friction and wear testing machine

[0050] 1.2. Test drugs

[0051] 1) Ethanol cleaning agent

[0052] 2) Concentrated hydrochloric acid, concentrated nitric acid (mixed into aqua regia at a volume of 3:1)

[0053] 2. Characterization and test methods

[0054] 2.1. X-ray diffraction analysis

[0055] The surface of the sample is flattened and measured with a Bruker AXS D8-Advance X-ray diffractometer (Cu target, Kα λ=0.154nm. German Bruke...

Embodiment 2

[0128] The difference between this embodiment and embodiment 1 is that a nano-intermetallic compound dispersion strengthened high-conductivity wear-resistant copper alloy is provided, the composition and mass percentage are as follows: Sn: 4%, Ni: 4%, Ag: 0.05%, Rare earth elements: 0.07%, Zn: 2.43%, Al: 4%, Mn: 3.5%, Sc: 0.05; B: 0.02%; rare earth elements include Ce, La and Y; Ce: 0.019%, La: 0.038%, Y : 0.013%, the balance is Cu.

[0129] A kind of manufacture method of nanometer intermetallic compound dispersion strengthened high conductivity wear-resistant copper alloy, comprises the following steps:

[0130] Step 1: Use a power frequency melting furnace to smelt copper alloys: preheat the power frequency melting furnace at 600°C. After the preheating is complete, put Zn into the bottom of the power frequency melting furnace, then cover the Zn with Cu, and raise the temperature to 750°C within 30 minutes After melting, the temperature is raised to 2300°C within 4 hours, ...

Embodiment 3

[0137]The difference between this embodiment and embodiment 1 is that a nano-intermetallic compound dispersion strengthened high-conductivity wear-resistant copper alloy is provided, the composition and mass percentage are as follows: Sn: 6%, Ni: 2%, Ag: 0.3%, Rare earth elements: 0.12%, Zn: 2%, Mn: 3.5%, Sc: 0.02%; B: 0.02%; rare earth elements include Ce, La, Y and Pr; Ce: 0.019%, La: 0.038%, Y: 0.013 %, Pr: 0.05%, and the balance is Cu.

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Abstract

The invention discloses a nano intermetallic compound dispersion strengthened high-conductivity wear-resistant copper alloy and a manufacturing method and application thereof. The copper alloy comprises the following components of, by mass, 4%-8% of Sn, 1.5%-4% of Ni, 0.05%-0.6% of Ag, 0.07%-0.2% of rare earth elements, 1.48%-2.43% of Zn, 3.52%-7.57% of X and the balance Cu, wherein the X is any one or more of Al, Mn, Sc and B, the rare earth elements at least comprise Ce, La and Y, the mass percentage ratio of the rare earth elements to the Sn is 1: (40-55), and the mass percentage ratio of the Ce to the La to the Y is (0.2-0.5): 1: (0.1-0.35). The copper alloy can be applied to a high-speed train motor rotor friction disc. The copper alloy has good wear resistance and electrical conductivity.

Description

technical field [0001] The invention relates to a nano-intermetallic compound dispersion-strengthened high-conductivity and wear-resistant copper alloy and a manufacturing method and application thereof, belonging to the technical field of alloy materials. Background technique [0002] Traction motor is a key component of high-speed train power system, and its performance is related to the capacity and safety of high-speed trains. The basic channel of its power output is the flexible contact between the friction disc at the end of the motor rotor and the carbon brush. Usually, the operating power of the motor is above 650Kw, the rotor speed reaches 4000-5000rpm, and the working current is as high as 150-175A. The friction disc and carbon brush are easily damaged or unreliable contact under high-speed rotation, resulting in power supply failure. In addition to the scientific design of the motor system, the quality of the rotor friction disc is one of the main factors that de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/02C22C32/00C22C1/02C22C9/06C22C9/01F16D69/02
CPCC22C1/02C22C9/01C22C9/02C22C9/06C22C32/00F16D69/027
Inventor 张保森王章忠朱帅帅巨佳卢镔陶学伟张超
Owner NANJING INST OF TECH
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