Combining refining modification method for high-iron aluminium-silicon alloy composite material

An aluminum-based composite material and aluminum-silicon alloy technology, which is applied in the field of aluminum alloy casting, can solve the problems of lower alloy performance, general deterioration effect, and slow time, and achieve the effects of improving performance, finely refining the deterioration effect, and improving performance

Inactive Publication Date: 2017-05-31
镇江创智特种合金科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Na salt is gradually replaced by Sr because it is easy to decay and difficult to control, but the research results show that the addition of Sr modifier is also accompanied by the increase of defects such as pores, which is also prone to over-modification and reduces the performance of the alloy.
Sb modification has the advantages of no decay and degassing, but the modification effect is general and the corresponding time is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0025] Preparation of AlSi9Cu1-1Fe composite material:

[0026] 1.5%SiO in this implementation case 2 The specific operation method of the preparation technology of Fe-rich aluminum-based composite material is as follows:

[0027] 1. First, preheat a certain amount of Fe-rich aluminum-silicon alloy at 300°C for 5 minutes, and use a well-type resistance furnace and a graphite crucible to melt the above materials;

[0028] 2. Raise the temperature to 780°C and keep it warm for 20 minutes. After the aluminum-silicon alloy is melted, add 1.5% SiO 2 Add the powder into the alloy solution, stir, take out the crucible after reacting for 30min, add C 2 Cl 6 Perform refining degassing. Finally, it is cast in a copper mold. After air cooling, samples were taken to observe the microstructure and test its mechanical properties. It is found that the α-Al in the alloy is distributed in the form of coarse dendrites, the Fe phase exists in the form of coarse needle-like β-Fe phase, and ...

Embodiment example 2

[0030] Preparation and modification treatment of AlSi9Cu1-1Fe composite material:

[0031] This implementation case is basically the same as implementation case 1. The Mn content added in this case is 0.65 times of the Fe content, and the Sr content is 0.09% of the aluminum-silicon composite material. In this case, the specific operation process for the preparation and modification of AlSi9Cu1-1Fe composite material is as follows:

[0032] 1. First, preheat a certain amount of Fe-rich aluminum-silicon alloy at 300°C for 5 minutes, and use a well-type resistance furnace and a graphite crucible to melt the above materials;

[0033] 2. Raise the temperature to 780°C and keep it warm for 20 minutes. After the aluminum-silicon alloy is melted, add 1.5% SiO 2 Add the powder into the alloy solution, stir, take out the crucible after reacting for 30min, add C 2 Cl 6 Carry out refining degassing;

[0034] 3. Lower the temperature to 730°C-750°C, add 0.9% Al-10Sr alloy and 6.5% Al-1...

Embodiment example 3

[0036] Preparation of AlSi9Cu1-1Fe composite material and composite refinement and modification treatment:

[0037] This implementation case is basically the same as implementation case 1. The content of Mn added in this case is 0.65 times that of Fe, the content of Sr is 0.09% of the aluminum-silicon composite material, and the content of Al-3Ti-B is 0.1% of the aluminum-silicon composite material. In this case, the specific operation process for the preparation and composite modification of AlSi9Cu1-1Fe composite material is as follows:

[0038] 1. First, preheat a certain amount of Fe-rich aluminum-silicon alloy at 300°C for 5 minutes, and use a well-type resistance furnace and a graphite crucible to melt the above materials;

[0039] 2. Raise the temperature to 780°C and keep it warm for 20 minutes. After the aluminum-silicon alloy is melted, add 1.5% SiO 2 Add the powder into the alloy solution, stir, take out the crucible after reacting for 30min, add C 2 Cl 6 Carry o...

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Abstract

The invention discloses a combining refining modification method for a high-iron aluminium-silicon alloy composite material. The method comprises the following steps that (1) a melt of a SiO2 / rich-Fe aluminum matrix composite is prepared, and reaction is conducted for 30 min at the temperature of 780 DEG C; (2) multi-element combining refining modification agents are preheated at the temperature of 200 DEG C, and the multi-element combining refining modification agents comprise Sr, Mn and Al-3Ti-B; and (3) the multi-element combining refining modification agents are added into an aluminium alloy solution and stirred sufficiently till completely reacted, refining degassing is conducted by adding C2Cl6, and casting moulding is conducted in a copper mould after slagging-off. According to the combining refining modification method for the high-iron aluminium-silicon alloy composite material, refining and modification treatment of phases in high aluminium silicon alloy are combined into a whole, the melt processing technique is simplified, the method is simple, the refining modification agents are convenient to prepare, the adding amount is easy to control, no pollutant is separated out, and the modification effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, in particular to a composite refined modified SiO 2 / method for Fe-rich Al-matrix composites. Background technique [0002] Aluminum and its alloys are light in weight, high in strength, excellent in corrosion resistance, good in electrical conductivity and formability, and have become one of the most widely used metal materials and the second largest metal structural material after steel. The ternary phase α-Fe phase and β-Fe phase mainly exist in high-content aluminum alloys, and the α-Fe phase is Chinese character-shaped with complex spiral dendrites, which is less harmful to the performance of aluminum alloys. The β-Fe phase in the aluminum alloy is in the shape of thick needle flakes, which has a severe splitting effect on the matrix. [0003] Hypoeutectic aluminum-silicon alloy has low density, good casting performance, high mechanical properties, and can cast high-strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/04
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 张松利印厚尚张炳荣张冬梅张倩
Owner 镇江创智特种合金科技发展有限公司
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