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Preparation method of in-situ Al2O3 particle reinforced aluminum-based composite material

A particle-reinforced aluminum and composite material technology, which is applied in the field of aluminum-based composite materials, can solve the problems of difficult control of the reaction process, high reaction temperature, and difficult dispersion of particles, achieving environmental protection, good controllability, simple preparation process, and high performance. excellent effect

Inactive Publication Date: 2021-07-27
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, some main problems of in-situ nanoparticle-reinforced aluminum matrix composites include: ① when the nanoparticle size is small, the reinforcement powder tends to agglomerate, and the particles are easy to agglomerate in the melt, and the dispersion is poor; The matrix has poor wettability and the particles are difficult to disperse evenly in the melt; ③The reaction temperature of the in-situ reaction is high, the holding time is long, and the reaction process is complicated and difficult to control, so there will be intermediate equivalence during the reaction process

Method used

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  • Preparation method of in-situ Al2O3 particle reinforced aluminum-based composite material

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1 prepares 0.5vol% Al 2 o 3 / 7085 aluminum matrix composite material (Al 2 o 3 Particles account for 0.5% of the volume of the entire aluminum-based composite material, hereinafter the same) The preparation process is as follows

[0023] Mix the dried aluminum powder and nano-zinc oxide powder (20nm in diameter) in a mass ratio of 1:1, and then add them to a ball mill for ball milling at a speed of 250r / min and a ball-to-material ratio of 10:1. The ball milling time is 12 hours. Dry and preheat the mixed powder at 150°C for 2 hours, melt the 7085 aluminum alloy, cool it down to 720°C, refine and remove slag, keep it for 10 minutes, cool it down to 625°C in a semi-solid state, and carry out mechanical stirring While adding the mixed powder after ball milling, the rotation speed of the stirring paddle is 800-1200rpm, and the stirring time is 5-8min. After the mechanical stirring is completed, the melt temperature is raised to 850°C and kept for 1h, then cool...

Embodiment 2

[0024] Embodiment 2 prepares 1vol% Al 2 o 3 The preparation process of / 7085 aluminum matrix composite material is as follows

[0025] Mix the dried aluminum powder and nano-zinc oxide powder (20nm in diameter) in a mass ratio of 1:1, then add them to a ball mill for ball milling at a speed of 250r / min, and a ball-to-material ratio of 10:1. The time is 12 hours, the mixed powder after ball milling is dried and preheated at 150°C for 2 hours, the 7085 aluminum alloy is melted, the temperature is lowered to 720°C, the refining slag is removed, and after 10 minutes of heat preservation, the temperature is lowered to 625°C in a semi-solid state, and mechanical stirring is performed While adding the mixed powder after ball milling, the rotation speed of the stirring paddle is 800-1200rpm, and the stirring time is 5-8min. After the mechanical stirring is completed, the melt temperature is raised to 850°C and kept for 1h, then cooled to 750°C, and ultrasonic treatment is applied. T...

Embodiment 3

[0026] Embodiment 3 prepares 3vol%Al 2 o 3 The preparation process of / 7085 aluminum matrix composite material is as follows

[0027] Mix the dried aluminum powder and nano-zinc oxide powder (20nm in diameter) in a mass ratio of 1:1, then add them to a ball mill for ball milling at a speed of 250r / min, and a ball-to-material ratio of 10:1. The time is 12 hours, the mixed powder after ball milling is dried and preheated at 150°C for 2 hours, the 7085 aluminum alloy is melted, the temperature is lowered to 720°C, the refining slag is removed, and after 10 minutes of heat preservation, the temperature is lowered to 625°C in a semi-solid state, and mechanical stirring is performed While adding the mixed powder after ball milling, the rotation speed of the stirring paddle is 800-1200rpm, and the stirring time is 5-8min. After the mechanical stirring is completed, the melt temperature is raised to 850°C and kept for 1h, then cooled to 750°C, and ultrasonic treatment is applied. Th...

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Abstract

The invention belongs to the technical field of aluminum-based composite materials, and particularly relates to a preparation method of an in-situ Al2O3 particle reinforced aluminum-based composite material. According to the preparation method, dried nano ZnO powder and aluminum powder are mixed, and ball milling is carried out on the mixed powder in a ball milling tank under argon shielding. Then, the ball-milled mixed powder is dried, the drilled ball-milled mixed powder is added into 7085 aluminum alloy semi-solid melt under a mechanical stirring condition, after adding is completed, temperature increase and heat preservation are carried out, then the temperature is decreased to a certain temperature, corresponding ultrasonic treatment is applied, and after standing and deslagging, casting is carried out to obtain the in-situ Al2O3 particle reinforced aluminum-based composite material. According to the preparation method, the aluminum melt is added into the prefabricated mixed powder, the utilization rate of reactant powder is high, interface wettability is improved, reacting is quite easy, the preparation process is simple, green, environment-friendly and good in controllability, and the prepared aluminum-based composite material is uniform in reinforced particle distribution, clean in reinforced particle and matrix interface, excellent in performance and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of aluminum-based composite materials, and in particular relates to an in-situ Al 2 o 3 A method for preparing particle-reinforced aluminum matrix composites. Background technique [0002] In-situ particle reinforced aluminum matrix composites have high specific strength, specific stiffness, specific modulus, good wear resistance and thermal stability, as well as good oxidation resistance and corrosion resistance. And compared with the external addition method, it has good wettability and high bonding strength by enhancing the interface between particles and the matrix, so it has great application potential in aerospace, national defense, industry and other fields. [0003] At present, the most common reinforcing particles used in in-situ aluminum matrix composites are mainly Al 2 o 3 , TiC and TiB 2 wait while Al 2 o 3 The particle hardness is high, which can make the composite material with it as th...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/02B22F9/04C22B9/02C22C21/10
CPCC22C1/1036C22C1/1005B22F9/04C22B9/026B22F2009/043C22C21/10C22C1/1052C22C1/12Y02P10/20
Inventor 陈刚丁大力赵玉涛张振亚张陈庭颖
Owner JIANGSU UNIV
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