Method for preparing aluminum based composite material enhanced by granules in situ

A technology for particle-reinforced aluminum and composite materials, which is applied in the field of in-situ particle-reinforced aluminum-based composite material preparation, can solve the problems of high price of external reinforcement particles, complicated preparation process, poor wettability between reinforcement particles and matrix, etc., and achieves good promotion value. , low cost of raw materials, simple process effect

Inactive Publication Date: 2006-02-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problems of high price of additional reinforcing particles, complex preparation process, and is not suitable for large-scale production. At the same time, the wettability between the reinforcing particles and the matrix in the prepared composite material is poor, and the reaction between the reinforcing particles and the interface is not easy to control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The components and mass percentages of the material of the present invention are: Zn 5%, Mg 1%, Cu 2%, Cr 0.1%, TiB 2 Reinforcing particles 0.1%, the balance is Al.

[0015] The preparation process of the present invention is as follows:

[0016] After the aluminum ingot is melted, a covering agent is added to cover the melt, the temperature is raised to 680°C, and KBF with a mass ratio of 1:0.5 4 、K 2 TiF 6 After mixing evenly and drying, add it to the melt and stir it. After the reaction is over, take out the reaction by-products, add Mg, Zn, Al-Cr, Al-Cu, add a refining agent to the melt for degassing and refining, and remove Remove dross, then stand still for 10min, at a standing temperature of 680°C, pour it into a mold, heat the billet at 420°C for 20 hours for homogenization annealing, turn and peel off, preheat at 420°C and extrude into rods with an extrusion ratio of 10 material. The solid solution temperature is 430°C, heat preservation for 50min, water q...

Embodiment 2

[0018] The components and mass percentages of the material of the present invention are: Zn 7%, Mg 1.5%, Cu 3%, Cr 0.3%, TiB 2 Reinforcing particles 20%, the balance is Al.

[0019] The preparation process of the present invention is as follows:

[0020] After the aluminum ingot is melted, a covering agent is added to cover the melt, the temperature is raised to 850°C, and KBF with a mass ratio of 1:1.5 4 、K 2 TiF 6 After mixing evenly and drying, add it to the melt and stir it. After the reaction is over, take out the reaction by-products, add Mg, Zn, Al-Cr, Al-Cu, add a refining agent to the melt for degassing and refining, and remove Remove scum, then let it stand for 20 minutes at a standing temperature of 720°C, pour it into a mold, heat the billet at 450°C for 30 hours for homogenization annealing, turn and peel off the skin, preheat at 450°C and extrude it into a rod on a press. The extrusion ratio is 30, the solid solution temperature is 450°C, the temperature is k...

Embodiment 3

[0022] The components and mass percentages of the material of the present invention are: Zn 10%, Mg 3%, Cu 4%, Cr 0.5%, TiB 2 Reinforcing particles 40%, the balance is Al.

[0023] The preparation process of the present invention is as follows:

[0024] After the aluminum ingot is melted, a covering agent is added to cover the melt, the temperature is raised to 1000°C, and KBF with a mass ratio of 1:2 4 、K 2 TiF 6 After mixing evenly and drying, add it to the melt and stir it. After the reaction, take out the reaction by-products, add Mg, Zn, Al-Cr, Al-Cu, and add refining agent to the melt for degassing and refining. Remove scum, then let it stand for 30 minutes at a standing temperature of 780°C, pour it into a mold, heat the billet at 470°C for 36 hours for homogenization annealing, turn and peel off the skin, preheat at 470°C and extrude it into a rod on a press. The extrusion ratio is 50, the solid solution temperature is 470°C, the temperature is kept for 50 minutes,...

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Abstract

An in-situ particles reinforced Al-base composition contains Zn (5-10 Wt%), Mg (1-3), Cu (2-4), Cr (0.1-0.5), reinforcing TiB2 particles (0.1-40) and Al (rest). Its preparing process includes such steps as heating high-purity industrial Al in crucible, covering it by high-temp covering agent, heating, adding the dried mixture of KBF4 and K2TiF6, mechanical stirring while reaction, taking out by-product, adding alloy and refining agent (Al-alloy), refining, casting, homogenizing, turning to remove skin, hot squeezing and sosoloid ageing. Its advantage is high mechanical performance.

Description

technical field [0001] The invention relates to a preparation method belonging to the technical field of materials, in particular to a preparation method of an in-situ particle reinforced aluminum matrix composite material. Background technique [0002] Aluminum matrix composites have the advantages of high specific strength, high specific modulus, and small thermal expansion coefficient, and are widely used in aerospace, national defense, industry and other fields. The preparation methods of aluminum matrix composites include stirring casting, squeeze casting, vacuum pressure infiltration, mechanical alloying, powder metallurgy and other processes. Due to the poor wettability between reinforcing particles and matrix in the aluminum matrix, the interface reaction is difficult to control, and the distribution of reinforcing particles is uneven, which affects the performance of aluminum matrix composites. At the same time, the preparation process of using external particles i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/02C22F1/04
Inventor 王浩伟陈东马乃恒易宏展李险峰
Owner SHANGHAI JIAO TONG UNIV
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