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WC-Co nano-reinforced high-silicon aluminum alloy for electric connecting fitting and preparation method of WC-Co nano-reinforced high-silicon aluminum alloy

A high-silicon aluminum alloy and nano-reinforcement technology, which is applied in the field of high-silicon aluminum alloy reinforcement, can solve the problems of coarse microstructure grains, affecting the mechanical properties of electrical connection fittings materials, and weak tensile strength of alloys, etc., to achieve superior density , strong practical significance, and the effect of reducing manufacturing costs

Active Publication Date: 2019-04-05
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in practical application, Al-Si also exposed some defects
For example, the tensile strength of the alloy is relatively weak, and when the Si content exceeds 15%, it will cause coarse grains in the microstructure, which will affect the mechanical properties of the electrical connection fittings material

Method used

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  • WC-Co nano-reinforced high-silicon aluminum alloy for electric connecting fitting and preparation method of WC-Co nano-reinforced high-silicon aluminum alloy
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Experimental program
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Effect test

Embodiment 1

[0029] (1) As a limitation to the present invention, the composition ratio of WC-Co nano-reinforced high-silicon aluminum alloy used in the present invention is: 3.0% WC, 0.1% Co, 60% Al, 36.9% Si, and the balance is unavoidable of impurities. Among them, the particle size of WC powder is 3 μm, the grain size is 200 nm, the particle size of Co powder is 2 μm, the particle size of Al powder is 75 μm, and the particle size of Si powder is 75 μm.

[0030] (2) Put the Al powder into a ball mill and mill it for 12 hours, the ball-to-material ratio is 10:1, the ball milling speed is 200r / min, and high-purity Ar gas is used as the protective atmosphere to destroy the surface oxide layer of the Al powder, and then the Distribution ratio Mix 3.0% WC, 0.1% Co, 60% Al, 36.9% Si on the mixer for 30-60min, mix evenly, then put the mechanically mixed powder into the mold for pressing, the molding pressing pressure is 500MPa, The holding time is 1-3min, put it into a rapid heating electric ...

Embodiment 2

[0032] (1) The composition ratio of the WC-Co nano-reinforced high-silicon aluminum alloy used is: 5.0% WC, 0.2% Co, 70% Al, 24.8% Si, and the balance is unavoidable impurities. Among them, the particle size of WC powder is 3 μm, the grain size is 200 nm, the particle size of Co powder is 2 μm, the particle size of Al powder is 75 μm, and the particle size of Si powder is 75 μm.

[0033] (2) Put the Al powder into a ball mill and mill it for 12 hours, the ball-to-material ratio is 10:1, the ball milling speed is 200r / min, and high-purity Ar gas is used as the protective atmosphere to destroy the surface oxide layer of the Al powder, and then the The distribution ratio is 5.0% WC, 0.2% Co, 70% Al, 24.8% Si, and the balance is unavoidable impurities. Mix on the mixer for 45min, mix evenly, then put the mechanically mixed powder into the mold for pressurization, the molding pressing pressure is 500MPa, the holding time is 3min, put it into the rapid heating electric furnace for s...

Embodiment 3

[0035] (1) The composition ratio of the WC-Co nano-reinforced high-silicon aluminum alloy used is: 8.0% WC, 0.3% Co, 80% Al, 11.8% Si, and the balance is unavoidable impurities. Among them, the particle size of WC powder is 3 μm, the grain size is 200 nm, the particle size of Co powder is 2 μm, the particle size of Al powder is 75 μm, and the particle size of Si powder is 75 μm.

[0036] (2) Put the Al powder into a ball mill and mill it for 12 hours, the ball-to-material ratio is 10:1, the ball milling speed is 200r / min, and high-purity Ar gas is used as the protective atmosphere to destroy the surface oxide layer of the Al powder, and then the Distribution ratio Mix 8.0% WC, 0.3% Co, 80% Al, 11.8% Si on the mixer for 45 minutes, mix evenly, then put the mechanically mixed powder into the mold for pressing, the molding pressing pressure is 500MPa, the holding time Put it into a rapid heating electric furnace for 3min for sintering, the sintering environment is under the prote...

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Abstract

The invention relates to a WC-Co nano-reinforced high silicon aluminum alloy for an electric connecting fitting. The WC-Co nano-reinforced high silicon aluminum alloy for the electric connecting fitting is characterized in that the WC-Co nano-reinforced high silicon aluminum alloy is prepared from the following components in percentage by mass: 3.0%-8.0% of WC, 0.1%-2.0% of Co, 60%-80% of Al, 10%-30% of Si and the balance of inevitable impurities. Through the method of adding nano-WC-Co powder to reinforce an Al-Si alloy, the composition segregation and organization coarsening are effectivelyreduced, and the mechanical properties of the Al-Si alloy are greatly improved, so that the safety of the electric connecting fitting is ensured.

Description

technical field [0001] The invention relates to a high-silicon aluminum alloy reinforcement technology, in particular to a WC-Co nano-reinforced high-silicon aluminum alloy for electric power connection fittings and a preparation method thereof Background technique [0002] The existing UHV power transmission lines are characterized by large and long transmission capacity, and need to pass through areas with complex geological topography such as mountains and hills. The line has the characteristics of a large number of wire splits, a large load and a large span. Therefore, a series of technical indicators such as corrosion resistance, high reliability, and high wear resistance have been proposed for power connection fittings. The current design idea of ​​connecting fittings generally ensures the load demand of the line by increasing the tonnage and size of the fittings. But increased production, transportation, construction costs and technical difficulties. Therefore, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C32/00C22C1/05C22C1/10
CPCC22C1/05C22C21/02C22C32/0052
Inventor 顾建李冬青周立宪刘胜春张军司佳钧刘臻
Owner CHINA ELECTRIC POWER RES INST
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