A kind of wc-co nano-enhanced high-silicon aluminum alloy for power connection fittings and preparation method thereof

A high-silicon aluminum alloy and nano-enhancing technology, 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, weak alloy tensile strength, etc., and achieve superior density. , Strong practical significance, the effect of reducing manufacturing costs

Active Publication Date: 2022-07-01
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of wc-co nano-enhanced high-silicon aluminum alloy for power connection fittings and preparation method thereof
  • A kind of wc-co nano-enhanced high-silicon aluminum alloy for power connection fittings and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] (1) As a limitation of the present invention, the composition ratio of the WC-Co nano-enhanced high-silicon aluminum alloy used in the present invention is: 3.0% WC, 0.1% Co, 60% Al, 36.9% Si, and the remainder 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 for ball milling for 12 hours, the ball-to-material ratio is 10:1, the ball milling speed is 200 r / min, and high-purity Ar gas is used as the protective atmosphere to destroy the oxide layer on the surface of the Al powder. Distribution ratio: Mix 3.0% WC, 0.1% Co, 60% Al, 36.9% Si on a mixer for 30-60 minutes, mix uniformly, and then put the mechanically mixed powder into the mold for pressure, and the molding pressure is 500MPa, The pressure holding time is 1-3min, put into a rapid h...

Embodiment 2

[0032] (1) The composition ratio of the WC-Co nano-enhanced high-silicon aluminum alloy used is: 5.0% WC, 0.2% Co, 70% Al, 24.8% Si, and the balance is inevitable 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 for ball milling for 12 hours, the ball-to-material ratio is 10:1, the ball milling speed is 200 r / min, and high-purity Ar gas is used as the protective atmosphere to destroy the oxide layer on the surface of the Al powder. The distribution ratio will be 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 pressure, the molding pressure is 500MPa, the pressure holding time is 3min, put into a rapid heating electric furnace for sintering,...

Embodiment 3

[0035] (1) The composition ratio of the WC-Co nano-enhanced high-silicon aluminum alloy used is: 8.0% WC, 0.3% Co, 80% Al, 11.8% Si, and the balance is inevitable 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 for ball milling for 12 hours, the ball-to-material ratio is 10:1, the ball milling speed is 200 r / min, and high-purity Ar gas is used as the protective atmosphere to destroy the oxide layer on the surface of the Al powder. Distribution ratio Mix 8.0% WC, 0.3% Co, 80% Al, 11.8% Si on a mixer for 45 minutes, mix evenly, and then put the mechanically mixed powder into the mold for pressure, the molding pressure is 500MPa, and the holding time is For 3min, put it into a rapid heating electric furnace for sintering, the sintering environment is carried out in a ...

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Abstract

A WC-Co nano-enhanced high-silicon aluminum alloy for power connection fittings, characterized in that, the WC-Co nano-enhanced high-silicon aluminum alloy comprises the following components by mass percentage: 3.0-8.0% WC, 0.1 ~ 2.0% Co, 60% ~ 80% Al, 10 ~ 30% Si, the balance is unavoidable impurities. The method of strengthening Al-Si alloy by adding nano-WC-Co powder effectively reduces the composition segregation and microstructure coarsening, and greatly improves the mechanical properties of Al-Si alloy, thus ensuring the safety of electrical connection fittings.

Description

technical field [0001] The invention relates to a high-silicon aluminum alloy enhancement technology, in particular to a WC-Co nano-enhanced high-silicon aluminum alloy for electrical connection fittings and a preparation method thereof Background technique [0002] The existing UHV transmission lines are characterized by large and long transmission capacity, and need to pass through areas with complex geological features 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 are proposed for power connection fittings. The current design ideas for connecting fittings generally ensure 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 is the future technology...

Claims

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Application Information

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Patent Type & Authority Patents(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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