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Method for quickly preparing hypereutectic Al-Si alloy bar billet at low cost

An aluminum-silicon alloy and hypereutectic technology is applied in the field of low-cost and rapid preparation of hypereutectic aluminum-silicon alloy rod blanks, and can solve the problem of high preparation cost, difficulty in continuous preparation of hypereutectic aluminum-silicon alloy rod blanks, limited blank volume, etc. problem, to achieve the effect of uniform distribution, fine silicon grains and high production efficiency

Active Publication Date: 2012-07-04
有研金属复材技术有限公司
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Problems solved by technology

This technology mainly adopts the method of spray deposition. Although this method can prepare a hypereutectic aluminum-silicon alloy blank with fine grains and uniform distribution of primary silicon, the preparation cost of this method is very high, and the volume of the blank produced is limited. It is difficult to realize the continuous preparation of large batches of hypereutectic Al-Si alloy billets

Method used

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  • Method for quickly preparing hypereutectic Al-Si alloy bar billet at low cost
  • Method for quickly preparing hypereutectic Al-Si alloy bar billet at low cost
  • Method for quickly preparing hypereutectic Al-Si alloy bar billet at low cost

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Embodiment 1

[0021] The Φ76mm used in the swash plate parts of automobile air-conditioning compressors, the American brand with a silicon content of 16% to 18% is the preparation of A390 aluminum alloy billets:

[0022] (1) Under the protection of argon, place the aluminum ingot in an intermediate frequency induction furnace to melt into an alloy melt. When the temperature of the melt rises to 840°C, transfer it to the tundish 1, add a melt slag remover, and fully Stir and keep warm for 20 minutes and remove the scum;

[0023] (2) When the melt temperature drops to 820°C, add an Al-P master alloy modifier with a mass percentage of 2‰, stir evenly, and keep warm for 30 minutes;

[0024] (3) When the melt temperature drops to 790°C, add a refining agent with a mass percentage of 4‰, fully stir, and remove the scum after 15 minutes of heat preservation;

[0025] (4) Carry out degassing treatment to the alloy melt: feed hexachloroethane into the melt, the gas pressure is 0.01MPa, keep warm fo...

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Abstract

The invention discloses a method for quickly preparing a hypereutectic Al-Si alloy bar billet at low cost, and belongs to the technical field of metal material processing. The method comprises the following steps: smelting a hypereutectic Al-Si alloy under the protection of inert gas; refining melt by adopting multiple modification at high temperature; degassing the melt; and finally, performing quick semicontinuous casting by adopting an electromagnetic stirring method. The method can prepare the hypereutectic Al-Si alloy bar billet which has the advantages of high performance, large size, fine primary silicon grains, and uniform distribution of the silicon grains. The method has the advantages of simple process, low cost, high production efficiency and suitability for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, in particular to a low-cost and fast method for preparing a hypereutectic aluminum-silicon alloy billet. Background technique [0002] Hypereutectic aluminum-silicon alloy is one of the most promising light-weight wear-resistant materials at present, because of its low density, good fluidity, small linear expansion coefficient, good thermal stability, high strength and high wear resistance, etc. Advantages: It is an ideal material for preparing automotive engine pistons, cylinders, automotive air-conditioning compressor pistons, swash plates and other parts. Its wear resistance increases with the increase of silicon content, but the hypereutectic aluminum-silicon alloy with high silicon content prepared by conventional casting method often has the phenomenon of coarse primary silicon, angular and primary silicon segregation, which directly causes the material Uneven performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115B22D11/18B22D11/11C22C1/00
Inventor 徐骏陈春生张志峰梁博石力开
Owner 有研金属复材技术有限公司
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