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Method for preparing rapid solidified fine spherical high-silicon high-wear-resistant aluminum-silicon alloy powder

An aluminum-silicon alloy, high wear-resistant technology is applied in the field of preparation of rapidly solidified fine spherical high-silicon and high-wear-resistant aluminum-silicon alloy powder, which can solve the limitation of the application range of aluminum-silicon alloy, the increase of oxygen content and water content, and the range of alloy crystallization. increase, etc.

Inactive Publication Date: 2015-10-07
LUXI COUNTY QUNXIANG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the traditional atomization technology conditions, due to the release of a large amount of latent heat of crystallization when the primary silicon is precipitated, the hypereutectic aluminum-silicon alloy has good fluidity, but as the content of silicon in the alloy increases, the linear shrinkage decreases, but The crystallization range of the alloy increases, the tendency of shrinkage porosity increases, the air tightness decreases, and the performance of the alloy also decreases, especially its poor sphericity, serious satellite phenomenon, decreased tap density, bulk density, and oxygen content. Increased water content severely limits the application range of Al-Si alloys

Method used

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  • Method for preparing rapid solidified fine spherical high-silicon high-wear-resistant aluminum-silicon alloy powder
  • Method for preparing rapid solidified fine spherical high-silicon high-wear-resistant aluminum-silicon alloy powder
  • Method for preparing rapid solidified fine spherical high-silicon high-wear-resistant aluminum-silicon alloy powder

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Example 1: Metal aluminum ingot with a purity of 99.85%, weighed 55Kg, first added to a non-polluting crucible and heated to 850°C, then a metal silicon block with a purity of 99.7%, weighed 45Kg, added to molten aluminum to heat up After reaching 950°C, fully stir, then place the entire crucible furnace directly above the atomization device, and use 4MP pressure and 300°C nitrogen to spray at a cooling rate of 10 3 ~10 4 In the K / s atomization chamber, the aluminum-silicon alloy powder with an average size of 50 μm is collected.

[0015] Its preparation process parameters are attached in Table 1:

[0016]

[0017] Properties of aluminum silicon alloy powder:

[0018] Tap density: 1.221g / cm 3 , bulk density: 0.667g / cm 3 , Oxygen content: 0.41%, water content: 0.1%.

[0019] Chemical composition: Fe≤0.6%, Si44%, Cu3.5%, Al52.3%, other 0.4%.

Embodiment 2

[0020] Example 2: Metal aluminum ingots with a purity of 99.85%, weighed 55Kg, were first added to a non-polluting crucible, heated to 850°C, and then metal silicon blocks with a purity of 99.7%, weighed 45Kg, were added to molten aluminum , stir after heating up to 950°C, then place the entire crucible furnace directly above the atomization device, use 5MPa pressure, nitrogen spray at 300°C temperature at a cooling rate of 10 3 ~10 4 In the atomization chamber of K / s, the aluminum-silicon alloy powder with an average particle size of 42 μm is collected.

[0021] Its preparation process parameters are attached in Table 2:

[0022]

[0023] Properties of aluminum silicon alloy powder:

[0024] Tap density: 1.33g / cm 3 , bulk density: 0.72g / cm 3 , Oxygen content: 0.41%, water content: 0.1%.

[0025] Chemical composition: Fe≤0.6%, Si44%, Cu3.5%, Al52.3%, other 0.4%.

Embodiment 3

[0026] Example 3: Metal aluminum ingots with a purity of 99.85%, weighed 55Kg, were first added to a non-polluting crucible, heated to 850°C, and then metal silicon blocks with a purity of 99.7%, weighed 45Kg, were added to molten aluminum , stir after heating up to 950°C, then place the entire crucible furnace directly above the atomization device, use 8MPa pressure, 300°C nitrogen spray at a cooling rate of 10 3 ~10 4 In the K / s atomization chamber, the aluminum-silicon alloy powder with an average particle size of 28 μm is collected.

[0027] Its preparation process parameters are listed in Table 3:

[0028]

[0029] Properties of aluminum silicon alloy powder:

[0030] Tap density: 1.32g / cm 3 , bulk density: 0.79g / cm 3 , Oxygen content: 0.41%, water content: 0.1%.

[0031] Chemical composition: Fe≤0.6%, Si44%, Cu3.5%, Al52.3%, other 0.4%.

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Abstract

The invention relates to a method for preparing rapid solidified fine spherical high-silicon high-wear-resistant aluminum-silicon alloy powder. The method comprises using high purity aluminum (>99.85 %) ingots and high purity silicon (>99.7%) ingots as raw material ingots, firstly fusing the high purity aluminum and then adding the silicon ingots to obtain a proper AlSi alloy solution, uniformly string, and spraying and atomizing the solution in a closed system through high pressure nitrogen, the alloy solution can be instantly cooled and solidified to form an alloy powder.

Description

technical field [0001] The invention relates to a preparation method of rapidly solidified fine spherical high-silicon and high-wear-resistant aluminum-silicon alloy powder. Background technique [0002] With the development of modern industry, especially the development of automobile and electronics industry, higher requirements are put forward for the performance of aluminum-silicon alloys, which is mainly reflected in the further improvement of wear resistance and heat resistance, and the reduction of linear shrinkage and density. In terms of alloy composition, it is characterized by high silicon content and alloying. Obviously, it is difficult to achieve the above requirements by ordinary casting method and modification treatment. Rapid solidification has the advantages of high cooling rate, uniform and fine structure, and obviously widened solid solubility range of alloying elements. The above requirements can be achieved. [0003] The use of rapid solidification techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 米成群米泽世
Owner LUXI COUNTY QUNXIANG NEW MATERIAL TECH CO LTD
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