Cast aluminum alloy for high-voltage power control assembly and preparation method of cast aluminum alloy

A technology for casting aluminum alloys and control components, applied in the field of aluminum alloys, can solve the problems of not being able to meet the requirements of mechanical properties and electrical conductivity of high-voltage power control components at the same time, small thermal tendency, poor electrical conductivity, etc., to reduce lattice defects, The effect of reducing distortion and improving electrical conductivity

Active Publication Date: 2015-07-01
NONFERROUS METALLIC OF HEBEI NEW LIZHONG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although aluminum-silicon alloy has excellent casting properties, such as good fluidity, good air tightness, small shrinkage rate and small heating tendency, it has good mechanical properties after modification and heat treatment, and is currently the most widely used aluminum alloy. However, the aluminum-silicon alloys in the prior art have poor electrical conductivity and cannot meet the requirements of high-voltage power control components in terms of mechanical properties and electrical conductivity.

Method used

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preparation example Construction

[0049] Correspondingly, the present invention also provides a method for preparing cast aluminum alloys for high-voltage power control components described in the above technical solution, including the following steps:

[0050] Put aluminum ingots and AlSi25 master alloy into the melting furnace, heat to 740~760°C for smelting, and adjust the Si content;

[0051] Add the boron of 0.06wt% total amount of feeding into described smelting furnace, leave standstill after stirring;

[0052] Take the upper melt sample of the smelting furnace, and test the V content of the sample to be below 0.005 wt %, and the electrical conductivity to reach 31.5~32MS / m;

[0053] Add 0.15wt% La in the total amount of feed, and stir the upper melt slightly after fully melting until the components are uniform;

[0054] Refining in argon, the pinholes reach the secondary standard, add 0.07wt% Mg after refining, and let stand;

[0055] Take the aluminum liquid in the upper layer of the melt as a spec...

Embodiment 1

[0068] (1) Cleaning of the melting crucible: In order to ensure the purity of the melt during the preparation process, the melting crucible should be thoroughly cleaned to ensure that there is no residue in the crucible;

[0069] (2) Melting: input Al 00 (Fe≈0.105wt%) and aluminum-silicon master alloy, melt and heat up to 750±10°C, detect chemical composition by spectroscopy, adjust Si element to 0.70wt%;

[0070] (3) Melt purification (step 1): add boron with a total weight of 0.05% of the total amount of feed, stir evenly and let stand for 20 minutes;

[0071] (4) Sample detection: Take the upper melt sample of the melting furnace, and it is strictly forbidden to stir the melt when sampling. The V content of the test sample reaches below 0.005wt%;

[0072] (5) Melt purification (step 2): Add La rare earth with a total amount of 0.10% by weight of the ingredients, and after fully melting, stir the upper melt slightly until the components are uniform;

[0073] (6) Refining ...

Embodiment 2

[0077] (1) Cleaning of the melting crucible: In order to ensure the purity of the melt during the preparation process, the melting crucible must be thoroughly cleaned to ensure that there is no residue in the crucible;

[0078] (2) Melting: input Al 00 (Fe≈0.105 wt %) and aluminum-silicon master alloy, melt and heat up to 750±10°C, detect the chemical composition by spectroscopy, and adjust the Si element to 1.00 wt %;

[0079] (3) Melt purification (step 1): add boron with a total weight of 0.08% of the total amount of material fed, stir evenly and let stand for 20 minutes;

[0080] (4) Sample detection: Take the upper melt sample of the melting furnace, and it is strictly forbidden to stir the melt when sampling. The V content of the test sample reaches below 0.005 wt %;

[0081] (5) Melt purification (step 2): Add La rare earth with a total amount of 0.13% by weight of the ingredients, fully melt and then slightly stir the upper melt until the components are uniform;

[...

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Abstract

The invention provides a cast aluminum alloy for a high-voltage power control assembly and a preparation method of the cast aluminum alloy. The cast aluminum alloy contains Si, B, Mg, La and the balance of Al and inevitable impurities. The dosage of the Si element is controlled, so that the requirements of the high-voltage power control assembly on the electrical conductivity can be met while the mechanical properties are improved. Secondly, the B element is added to react with the impurity elements capable of reducing the electrical conductivity in the alloy, and then the distortion of the internal crystal lattices of an aluminum conductor can be reduced, and furthermore, the crystal lattice defects can be reduced and the electrical conductivity can be improved. In addition, the rare earth element La is added to achieve certain effects of removing hydrogen, refining, purifying and altering, and therefore, the electrical conductivity of the aluminum alloy can be improved. The results of experiments indicate that the prepared cast aluminum alloy under a cast condition has the electrical conductivity of greater than or equal to 55% IACS, the tensile strength of 189-194MPa and the yield strength of 128-136Mpa, and has excellent electrical conductivity and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a cast aluminum alloy for high-voltage power control components and a preparation method thereof. Background technique [0002] Casting aluminum alloy is based on aluminum, which is filled with a mold in a molten state to obtain a casting blank of a certain shape and size. It has the characteristics of low specific gravity, high specific strength, easy processing, low cost and good corrosion resistance. It is used for Manufacture of parts with complex shapes, such as instrumentation, internal combustion engine pistons, aircraft and other shell parts, has been widely used in machinery, automobiles, construction, power and electrical industries and other fields. [0003] In recent years, the electric power industry has developed rapidly, and the demand for conductive materials is increasing day by day. As a traditional metal material, cast aluminum alloy has the character...

Claims

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Application Information

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IPC IPC(8): C22C21/02
Inventor 臧立根甄毅刘永昌刘锐葛素静王新杰
Owner NONFERROUS METALLIC OF HEBEI NEW LIZHONG GRP CO LTD
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