Preparation method of particle-reinforced high aluminum silicon based composite material

A composite material and particle-reinforced technology, which is applied in the field of aluminum-silicon alloy materials, can solve the problems of losing heterogeneous cores, coarsening and refining of primary silicon, and achieves improved mechanical properties and wear resistance of alloys, and simple preparation , excellent overall performance

Pending Publication Date: 2019-09-13
周凡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the use of aluminum-silicon alloy, if the particle-reinforced aluminum-based composite material contains Ti, it will cause silicon tissue poisoning. The content of Ti in the aluminum-silicon alloy reinforced with potassium fluorotitanate and SiCp is relatively high, and the refining mechanism of Ti and SiCp in Al It releases TiC particles in the melt, and its lattice structure is the same as that of Al. It can be used as the crystallization core of Al and acts as a heterogeneous nucleation. Due to the addition of Si, the refinement of Al-Si alloy becomes more complicated than that of pure aluminum. When the content of Si in Ti-containing aluminum exceeds 3%, the grains become coarser as the content increases, and its coarsening effect inhibits the refinement of the alloy. Si and Ti will form some stable compounds in the melt, which is very It may be coated on the surface of TiC particles, causing them to lose the role of heterogeneous cores and appear poisoning, resulting in coarsening of primary silicon, see figure 2 Toxic tissue, see figure 1 There is no organization to add SiCp and Ti, which limits the application

Method used

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  • Preparation method of particle-reinforced high aluminum silicon based composite material
  • Preparation method of particle-reinforced high aluminum silicon based composite material
  • Preparation method of particle-reinforced high aluminum silicon based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) First prepare materials according to mass percentage: silicon carbide powder and particles accounting for 10% of the total mass of the two, potassium fluotitanate accounting for 20% of the total mass of the two, and mix the above two powders evenly.

[0028] (2) Melt the aluminum-silicon alloy in the furnace, in which silicon accounts for 12%, and after heating up to 820°C, add two mixed powder raw materials that account for the weight ratio of the aluminum melt into the furnace and fully stir the melt to keep it warm for 10 minutes. After removing slag, add phosphorus salt modifier at 820°C, use nitrogen and argon to treat for 15-30 minutes, and cast it into an ingot.

[0029] (3) Melt the ZL109 alloy in the furnace, add 50% silicon carbide reinforcing agent to cast the ingot, add 3% refining agent at 720°C, refine for 10 minutes, add phosphor copper modifier with nitrogen and argon at 820°C Process for 15-30 minutes. Die cast or cast into various products.

[00...

Embodiment 2

[0034] (1) First prepare materials according to mass percentage: silicon carbide powder and particles accounting for 20% of the total mass of the two, potassium fluotitanate accounting for 40% of the total mass of the two, and mix the above two powders evenly.

[0035] (2) Melt the aluminum-silicon alloy in the furnace, in which silicon accounts for 20%, Fe5%, Cu4%, and Mg3% are heated to 1250°C, and then the two mixed powder materials accounting for the weight ratio of the aluminum melt are added to the furnace and fully stirred to melt After the liquid is kept warm for 10 minutes, after removing the slag from the molten liquid, add 3% refining agent at 760°C, refine for 10 minutes, refine, add phosphorus salt modifier at 820°C and treat with argon for 15-30 minutes, die-cast or cast into Various products.

[0036] It has been detected that silicon carbide or diamond components account for 20%.

[0037] For the friction test, the RFT friction testing machine was used, the fr...

Embodiment 3

[0040] (1) at first prepare material by mass percentage: account for the 18% silicon carbide powder 18% diamond powder of both gross mass and particle, account for the 50% potassium fluotitanate of both gross mass, above-mentioned two kinds of powders well mixed.

[0041] (2) Melt the aluminum-silicon alloy in the furnace, in which silicon accounts for 12%, and after heating up to 950°C, add three mixed powder materials accounting for the weight ratio of the aluminum melt into the furnace and fully stir the melt for 10 minutes. After removing the slag, add a phosphorus salt modifier at 820°C and treat with argon for 15-30 minutes, and cast it into an ingot.

[0042] (3) Melt the ADC12 alloy in the furnace, add 30% silicon carbide reinforcing agent to cast the ingot, after melting, add 3% refining agent at 720°C, refine for 10 minutes, add phosphorus salt modifier at 820°C and use nitrogen , argon for 15-30 minutes. Die cast or cast into various products.

[0043] After test...

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Abstract

The invention discloses a preparation method of a particle-reinforced aluminum silicon alloy material. The method is characterized by uniformly mixing silicon carbide and diamond mixed powder particles with potassium fluotitanate. The method comprises the following steps of melting an aluminum silicon alloy, wherein the silicon content of the aluminum silicon alloy is 5 %-30 % by weight, after heating to 820 DEG C-1250 DEG C, adding a mixed powder raw material into a furnace, fully stirring molten liquid and carrying out heat preservation, carrying out slagging off on the molten liquid, and after phosphor salt and phosphor copper are modified, carrying out direct pressure casting or casting to obtain various products; or adding the mixed powder particles to the aluminum silicon alloy or alloy of ZL109, ZL108, ADC12 to obtain a reinforced aluminum silicon alloy, adding a phosphor salt modifier or phosphor copper modifier at the temperature of 720 DEG C-850 DEG C, carrying out treatmentthrough nitrogen and argon for 15 min-30 min, and carrying out direct pressure casting or casting to obtain various products.

Description

technical field [0001] The invention belongs to the field of aluminum-silicon alloy materials, in particular to a method for preparing particle-reinforced high-alumina-silicon-based composite materials. Background technique [0002] Aluminum-silicon series is one of the materials with better comprehensive properties for aluminum alloys at present. Due to its good mechanical properties and casting properties, multi-component Al-Si alloys are not only widely used in piston production, but also in many fields of automobiles. Particle-reinforced aluminum-silicon alloy obtains sufficient heterogeneous particle-reinforced aluminum-based composite materials, which have potential applications due to a series of excellent properties such as low density, excellent casting performance, wear resistance, high specific strength, good thermal conductivity, and small thermal expansion coefficient. prospects and a broad market. In the use of aluminum-silicon alloy, if the particle-reinforce...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/10C22C1/06C22C26/00C22C32/00
CPCC22C1/06C22C1/1036C22C21/00C22C26/00C22C32/0047C22C32/0063
Inventor 周凡
Owner 周凡
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