Aluminum-based density gradient material and preparation method and application thereof

A density gradient, aluminum-based technology, applied in the field of aluminum-based density gradient materials and their preparation, can solve the problems of restricting the application of porous structure gradient materials, and achieve the effects of low cost, no obvious deformation, and widening the scope of application.

Active Publication Date: 2017-12-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these greatly limit the application of porous structured gradient materials
[0005] To sum up, the existing preparation methods have various limitations. At present, there is no mature and stable process to realize the effective control of the pore morphology and uniformity distribution in gradient materials, and the application environment of aerospace has great influence on the combination of Performance puts forward higher requirements

Method used

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  • Aluminum-based density gradient material and preparation method and application thereof
  • Aluminum-based density gradient material and preparation method and application thereof
  • Aluminum-based density gradient material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1: powder pretreatment; drying the aluminum matrix powder with a particle size of 8-15 μm and the water-soluble pore-forming agent powder with a particle size distribution of 15-40 μm in an oven at 80° C. for 4 hours.

[0056] Step 2: Prepare ingredients; mix 2A12 powder and water-soluble pore-forming agent powder according to the volume fraction of 7:3 (that is, the value of X is 30), and then mix in a three-dimensional mixer for 3 hours, and the speed of the mixer is 20r / min, and then take it out and seal it under vacuum environment for later use.

[0057] Step 3: Gradient forming; put the 2A12 aluminum alloy powder in the cold pressing mold and spread the powder evenly and pre-press manually, then lower the height of the mold head, and continue to use the composite powder prepared in step 2 on the previous pre-press body The prefabricated body is formed at 200MPa for laying and leveling, and the pressure is maintained for 20s to prepare a two-layer gradient pre...

Embodiment 2

[0062] Step 1: Powder pretreatment; drying the aluminum matrix powder with a particle size of 8-15 μm and the water-soluble pore-forming agent powder with a particle size distribution of 15-40 μm in an oven at 70° C. for 5 hours.

[0063] Step 2: Prepare ingredients; mix 2A12 powder and water-soluble pore-forming agent powder according to the volume fraction of 7:3 (that is, the value of X is 30), and then mix in a three-dimensional mixer for 4 hours, and the speed of the mixer is 20r / min, and then take it out and seal it under vacuum environment for later use.

[0064] Step 3: Gradient forming; put the 2A12 aluminum alloy powder in the cold pressing mold and spread the powder evenly and pre-press manually, then lower the height of the mold head, and continue to use the composite powder prepared in step 2 on the previous pre-press body The prefabricated body is formed at 200MPa for laying and leveling, and the pressure is maintained for 20s to prepare a two-layer gradient pre...

Embodiment 3

[0069] Step 1: powder pretreatment; drying the aluminum matrix powder with a particle size of 8-15 μm and the water-soluble pore-forming agent powder with a particle size distribution of 15-40 μm in an oven at 80° C. for 4 hours.

[0070] Step 2: Prepare ingredients; mix 2A12 powder and water-soluble pore-forming agent powder according to the volume ratio of 7:3 and 5: (that is, the values ​​of X are 30 and 50 respectively), and then mix them in a three-dimensional mixer for 4 hours, The speed of the mixer is 20r / min, and then it is taken out and sealed in a vacuum environment for later use.

[0071] Step 3: Gradient forming; place the 2A12 aluminum alloy powder in the cold pressing mold and spread the powder evenly and pre-press manually, then lower the height of the mold head, and prepare the composite powder with a volume fraction ratio of 7:3 prepared in step 2 Continue laying and leveling on the previous pre-pressed body and manually pre-press, then further lower the heig...

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Abstract

The invention relates to an aluminum-based density gradient material and a preparation method and application thereof. A region with density in gradient change and (or) a region with density in continuous change exist in the aluminum-based density gradient material, and the materials of all the regions in the aluminum-based density gradient material are consistent. The preparation method comprises the following steps: water-soluble pole-forming agent powder and aluminum alloy powder are proportioned according to the volume ratio of the water-soluble pole-forming agent powder to the aluminum alloy powder being X to (100-X), and then are mixed uniformly to obtain mixed powder containing different amounts of pole-forming agents; die forming is carried out on laminated spread powder, and a prefabricated blank is sintered in a vacuum environment at 575-675 DEG c to obtain a sintered body; and water soaking treatment is carried out to obtain the aluminum-based density gradient material. The aluminum-based density gradient material prepared by the method has no obvious deformation, and the density from 1.1 g / cm<3>-2.7g / cm<3> in gradient distribution is achieved through adjusting porosity; and the aluminum-based density gradient material is excellent in performance and is suitable for being used as an aerospace material.

Description

technical field [0001] The invention relates to an aluminum-based density gradient material and its preparation method and application, in particular to the powder metallurgy preparation technology of the aluminum-based density gradient material. Background technique [0002] With the continuous expansion of the country's modernization drive in the aerospace field, satellite exploration, space stations, lunar exploration projects and other fields have put forward higher than ever, more stringent requirements. With the complexity of the mission of the new generation of spacecraft, in addition to the weight of the propellant, the payload also occupies a large volume and weight. However, due to the constraints of the launch capability, the weight of the structure can be reduced to increase the weight of the payload. It means that reducing the weight of the structure can improve the satellite's ability to perform diverse tasks. [0003] Aluminum and its alloys have excellent p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/02B22F3/11
Inventor 马运柱刘超刘文胜杨玉玲刘阳龙路平伍镭
Owner CENT SOUTH UNIV
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