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Preparation method of boron carbide particle enhanced aluminum-based composite material

A particle-reinforced aluminum and composite material technology, which is applied in the field of lightweight high-performance aluminum-based composite materials and powder metallurgy, can solve the problems of cumbersome procedures, high porosity, and low density, and achieve simple production processes, high density, and The effect of short holding time

Active Publication Date: 2014-02-12
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature of the liquid manufacturing technology, the aluminum matrix will react with the reinforcement phase particles to form a brittle phase, which will affect the performance of the aluminum matrix composite material. The powder metallurgy method can realize sintering at a lower temperature. It is made into a mixed powder with aluminum matrix powder, and then formed, dried, hot-pressed and sintered to form an aluminum-based composite material. It is characterized by relatively low equipment requirements and is convenient for mass production. It has low density, high porosity and low performance. It is usually used to manufacture blanks for secondary processing such as extrusion, rolling, forging, and spinning to make finished products. The process is cumbersome

Method used

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  • Preparation method of boron carbide particle enhanced aluminum-based composite material
  • Preparation method of boron carbide particle enhanced aluminum-based composite material
  • Preparation method of boron carbide particle enhanced aluminum-based composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition ratio of the experimental boron carbide particle reinforced aluminum matrix composite material is: by mass, 7075 alloy powder is 97.5%, B 4 The C particle powder is 2.5%, and the composite powder is obtained by ball milling at a speed of 150 rpm on a light ball mill for 24 hours. The composite body is surface activated in a plasma activation sintering furnace. The surface activation time is 30s, the activation voltage is 20kV, and the activation current The temperature is 100A, the vacuum degree is ≤10Pa, the temperature rises rapidly after surface activation, the temperature rise rate is 100°C / min, the pressure is 20MPa, the temperature is raised to 530°C and kept for 5min, and the sample is obtained after sintering for heat treatment, and the boron carbide particle reinforced aluminum matrix composite is obtained. Material.

[0026] tested, see Figure 7 , the porosity of the aluminum matrix composite material at room temperature is ≤0.05%, and the de...

Embodiment 2

[0028] The composition ratio of the experimental boron carbide particle reinforced aluminum matrix composite is: by mass, 7075 alloy powder is 92.5%, B 4 The C particle powder is 7.5%, and the composite powder is obtained by ball milling at a speed of 150 rpm on a light ball mill for 24 hours. The composite body is surface activated in a plasma activation sintering furnace. The surface activation time is 30s, the activation voltage is 20kV, and the activation current The temperature is 100A, the vacuum degree is ≤10Pa, the temperature rises rapidly after surface activation, the temperature rise rate is 100°C / min, the pressure is 20MPa, the temperature is raised to 530°C and kept for 5min, and the sample is obtained after sintering for heat treatment, and the boron carbide particle reinforced aluminum matrix composite is obtained. Material.

[0029] tested, see Figure 7 , the porosity of the aluminum matrix composite material at room temperature is ≤0.07%, and the density is ...

Embodiment 3

[0031] The composition ratio of the experimental boron carbide particle reinforced aluminum matrix composite material is: by mass, 7075 alloy powder is 87.5%, B 4The C particle powder is 12.5%, and the composite powder is obtained by ball milling at a speed of 150 rpm on a light ball mill for 24 hours. The composite body is surface activated in a plasma activation sintering furnace. The surface activation time is 30s, the activation voltage is 20kV, and the activation current The temperature is 100A, the vacuum degree is ≤10Pa, the temperature rises rapidly after surface activation, the temperature rise rate is 100°C / min, the pressure is 30MPa, the temperature is raised to 510°C and kept for 5min, and the sample is obtained after sintering for heat treatment, and the boron carbide particle reinforced aluminum matrix composite is obtained. Material.

[0032] tested, see Figure 1-7 , the porosity of the aluminum matrix composite material at room temperature is ≤0.05%, and the ...

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Abstract

The invention relates to the technical fields of aluminum-based composite materials and preparation thereof, in particular to a boron carbide particle enhanced aluminum-based composite material and a preparation method thereof. According to the composite material, aluminum alloy is used as a matrix; the mass percentage of boron carbide used as a wild phase is 2.5 to 30%; the boron carbide particles are distributed in the matrix uniformly. The specific preparation method comprises the following steps: mixing boron carbide powder and aluminum alloy powder; performing surface activation, plasma activated sintering and heat treatment to prepare a sintering test sample close to full density. The aluminum-based composite material prepared by the method has low sintering temperature, high density, small crystal particles and an excellent mechanical property, is simple to operate and high in controllability, and is a lightweight high-performance aluminum-based composite material.

Description

technical field [0001] The invention belongs to the technical field of lightweight high-performance aluminum-based composite materials and powder metallurgy, in particular to a ceramic particle-reinforced aluminum-based composite material and a preparation method thereof. Background technique [0002] Due to its high specific strength, high specific stiffness, high elastic modulus, excellent wear resistance, low density, controllable expansion coefficient and many other advantages, ceramic particle reinforced aluminum matrix composites have important applications in the fields of automobile industry and aerospace. value and broad application prospects. Boron carbide has many excellent properties, mainly in high hardness, which is only lower than diamond and cubic boron nitride (CBN), and has constant high temperature hardness (>30GPa) and low density (2.529g / cm 3 ), good oxidation resistance, not easy to aging and corrosion, strong acid resistance, etc. The boron carbide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C21/00C22C32/00C22F1/04
Inventor 沈强吴传栋李成章方攀罗国强张联盟王传彬
Owner WUHAN UNIV OF TECH
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