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In-situ-synthesis particle-reinforced aluminum-base composite material and preparation method thereof

An aluminum-based composite material and particle-reinforced aluminum technology, which is applied in the field of in-situ self-generated particle-reinforced aluminum-based composite materials and its preparation, can solve the problems of unstable batch performance of composite materials, high fatigue life of hub splints, and difficult interface reactions. Control and other issues, to achieve good promotion and application value, improve comprehensive mechanical properties, and good plasticity

Active Publication Date: 2015-01-07
KING STRONG MATERIAL ENG LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with the matrix alloy, the mechanical properties of SiC particles reinforced aluminum matrix composites prepared by powder metallurgy method have obvious strengthening effect on the matrix, but the ultimate strength of aluminum matrix composites prepared in China is less than 570MPa. Powder metallurgy The maximum fatigue life of the hub splint prepared by the process is only 1600h
This is because there are obvious defects in the aluminum matrix composite material reinforced with external particles. Due to the sharp corners of the SiC particles, stress concentration and substrate scratches are easily formed at the sharp corners, causing fatigue failure of the composite material; at the same time, the SiC particles and the matrix still exist. Problems such as difficult control of interface reaction, poor wettability, and interface contamination lead to unstable batch performance of composite materials and inability to further improve material performance through extrusion, forging, etc., making it difficult to mass produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Add aluminum-based composite materials into a clean and dry crucible, and when the temperature rises to 820°C for melting, add DFC-200 high-temperature covering agent (which consists of the following components in weight percentage: NaF 35%, KCl 25% , CaF 15%, Na 2 AiF 6 20%+Al 2 o 3 5%). Then in the melt press potassium fluoroborate (KBF 4 ) and potassium fluorotitanate (K 2 TiF 6 ) The weight ratio of the substance is 1:2, and the dried mixed salt powder is added to carry out mechanical stirring, the stirring speed is 150rpm, and the stirring time is 30min. During the stirring process, argon gas was fed into the melt at the same time, and the flow rate was 80ml / min. Add YJ-1 aluminum alloy refining agent (it is made up of the component of following percentage by weight by melt weight 0.15% after reaction finishes: sodium nitrate NaNO 3 60%, graphite powder 10%, cryolite 30%), carry out degassing refining, slag removal, standing, the standing temperature is...

Embodiment 2

[0022] (1) Add aluminum-based composite materials into a clean and dry crucible, and when the temperature rises to 850°C to melt, add DFC-200 high-temperature covering agent, and then press K in the melt 2 TiF 6 and KBF 4 Add the dried mixed salt powder at a weight ratio of 1:2 for mechanical stirring, the stirring speed is 180rpm, and the stirring time is 20min. During the stirring process, argon gas was introduced into the melt at the same time, and the flow rate was 200ml / min. After the reaction, add YJ-1 aluminum alloy refining agent according to the melt weight of 0.15% to carry out degassing refining, slag removal, and standing. The standing temperature is 760° C. and the standing time is 30 minutes. Then cast into the mold to get the in situ authigenic TiB 2 Ingots of particle-reinforced aluminum matrix composites with a diameter of 320mm.

[0023] The mass percent content of each component of the aluminum matrix composite material is: Si: 0.42, Cu: 1.6, Mn: 0.26, M...

Embodiment 3

[0028] (1) Add aluminum-based composite materials into a clean and dry crucible, add DFC-200 high-temperature covering agent when the temperature rises to 830°C and melt, and then press K in the melt 2 TiF 6 and KBF 4 Add the dried mixed salt powder in the ratio of 1:2 for mechanical stirring, the stirring speed is 160rpm, and the stirring time is 25min. During the stirring process, argon gas was fed into the melt at the same time, and the flow rate was 160ml / min. After the reaction, 0.15% of the melt weight is added into the YJ-1 aluminum alloy refining agent for degassing and refining, slag removal, and standing. The standing temperature is 720° C. and the standing time is 30 minutes. Then cast into the mold to get the in situ authigenic TiB 2 Ingots of particle-reinforced aluminum matrix composites with a diameter of 320mm.

[0029] The mass percent content of each component of the aluminum matrix composite material is: Si: 0.4, Cu: 1.2, Mn: 0.32, Mg: 2.1, Cr: 0.18, Zn:...

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Abstract

The invention discloses an in-situ-synthesis particle-reinforced aluminum-base composite material applicable to helicopter hub splints, which comprises the following components in percentage by mass: 0.38-0.42% of Si, 1.2-2.0% of Cu, 0.26-0.32% of Mn, 2.1-2.9% of Mg, 0.1-0.28% of Cr, 5.1-6.1% of Zn, 5-12% of TiB2 particle and 78.7-82.22% of Al. The invention also discloses a preparation method of the in-situ-synthesis particle-reinforced aluminum-base composite material. The TiB2 particle is synthesized in the aluminum-base composite material in situ, so that the strength and modulus elasticity of the aluminum-base composite material are obviously enhanced, and the fracture toughness and fatigue resistance of the aluminum-base composite material are also greatly enhanced; and the material has favorable plasticity, thereby further enhancing the comprehensive mechanical properties of the material. The preparation method has the advantages of simple technique and cheap raw materials, is suitable for large-scale industrial production, and has favorable popularization and application value.

Description

technical field [0001] The invention relates to an aluminum-based composite material and a preparation method thereof, in particular to an in-situ self-generated particle-reinforced aluminum-based composite material that can be used for a helicopter hub splint and a preparation method thereof. Background technique [0002] As the core component of the armed helicopter, the rotor system puts forward extremely strict requirements on the performance of the hub splint material, which needs to have high specific strength, specific modulus, high toughness and fatigue resistance, etc. at the same time. However, traditional single metal materials are difficult to meet the requirements of the aviation field, so it is urgent to develop a new type of lightweight and high-strength composite material. The industry adds a ceramic reinforcement phase to the metal aluminum matrix to make a particle-reinforced metal matrix composite material, which significantly improves the strength, elasti...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C21/10C22C32/00C22F1/04C22F1/053
CPCC22C21/10C22C32/0073C22F1/053
Inventor 赵立英王刚刘平安吴清军
Owner KING STRONG MATERIAL ENG LTD
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