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Large-size ultrathin metal matrix density gradient material, and preparation method and application thereof

A density gradient, ultra-thin metal technology, applied in the field of powder metallurgy, can solve the problems of too thick single layer thickness and limited application fields, and achieve the effects of low cost, widening application scope and good pore uniformity.

Active Publication Date: 2018-10-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the principle that the application field is limited due to the excessive thickness of the single layer in the forming process of the existing gradient material, the inventor pioneered the design concept of the porous structure gradient material, and realized the large-scale ultra-thin gradient material by using the laminated powder pre-pressing-compression forming technology. Forming of material blanks

Method used

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  • Large-size ultrathin metal matrix density gradient material, and preparation method and application thereof
  • Large-size ultrathin metal matrix density gradient material, and preparation method and application thereof
  • Large-size ultrathin metal matrix density gradient material, and preparation method and application thereof

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Effect test

Embodiment 1

[0047] Step 1: Powder pretreatment and component preparation; dry the aluminum matrix powder (2A12 powder) with a particle size of 8-15 μm and the spherical sodium chloride powder with a particle size distribution of 30-50 μm in an oven at 80° C. for 4 hours. According to aluminum alloy powder: porogen powder = X: (100-X) mode is equipped with different systems of composite raw material powder; 2A12 powder and water-soluble pore-forming agent powder according to different volume fraction ratio (the value of X is respectively 60, 70 and 80), respectively numbered A1-A3, and then mixed in a three-dimensional mixer for 3 hours at a speed of 20r / min, and then taken out and sealed in a vacuum environment for later use.

[0048] Step 2: Lay-up powder laying and forming; according to the design height, lower the screw height controller to a certain height, weigh A1 powder quantitatively, lay it flat in the cold press mold and pre-press at 300MPa, hold the pressure for 5s, and then put...

Embodiment 2

[0054] Step 1: Powder pretreatment and component preparation; drying the aluminum matrix powder with a particle size of 8-15 μm and the spherical sodium chloride powder with a particle size distribution of 30-50 μm in an oven at 80° C. for 4 hours. According to aluminum alloy powder: porogen powder = X: (100-X) mode is equipped with different systems of composite raw material powder; 2A12 powder and water-soluble pore-forming agent powder according to different volume fraction ratio (the value of X is respectively 60, 70, 80, 90 and 100), respectively numbered A1-A5, and then mixed in a three-dimensional mixer for 3 hours at a speed of 20r / min, and then taken out and sealed in a vacuum environment for later use.

[0055] Step 2: Lay-up powder forming; replace the φ100mm forming mold, lower the screw height controller to a certain height according to the design height, weigh the A1 powder quantitatively, lay it flat in the cold pressing mold, and carry out 300MPa pre-compression...

Embodiment 3

[0061] Step 1: Powder pretreatment and ingredient preparation; dry the aluminum matrix powder with a particle size of 8-15 μm and the floating bead powder with a particle size distribution of 55-70 μm in an oven at 80° C. for 4 hours. According to the aluminum alloy powder: porogen powder = X: (100-X) mode is equipped with composite raw material powder of different systems; 2A12 powder and floating beads are proportioned according to different volume fractions (the value of X is respectively 60, 70, 80, 90 and 100), respectively numbered A1-A5, and then mixed in a three-dimensional mixer for 3 hours at a speed of 20r / min, and then taken out and sealed in a vacuum environment for later use.

[0062] Step 2: Lay-up powder forming; replace the φ100mm forming mold, lower the screw height controller to a certain height according to the design height, weigh the A1 powder quantitatively, lay it flat in the cold pressing mold, and carry out 300MPa pre-compression and pressure-holding ...

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Abstract

The invention relates to a large-size ultrathin metal matrix density gradient material, and a preparation method and application thereof. A designed product has an area with the gradient density and / or an area with the continuous changing density. The thickness of the designed product is less than or equal to 3 mm, the size of at least one dimension of the other two dimensions exceeds 50 mm. The forming method comprises the steps of prepressing raw material powder containing the maximum pore-foaming agent first to obtain a first preformed compact; laying set powder on the first preformed compact and then conducts prepressing to obtain a second preformed compact; repeating the steps until prepressing is completed, and conducting sintering and pore-foaming agent removal treatment to obtain afinished product. When an aluminum base serves as a matrix, the density of a sample is in gradient distribution within 1.3-2.7 g / cm3, and the number of gradient layers can be 10 at most on the premise of the total thickness not exceeding 2 mm. The metal matrix density gradient material prepared through the method has excellent properties and can be extensively applied to the fields of aerospace and national defense and military industry.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a large-size ultra-thin metal-based density gradient material and its preparation method and application. Background technique [0002] Materials are the pillars of modern science and technology and social development, and the competition of modern high technology depends to a large extent on the development of material science. For materials, especially high-performance materials, the cognition level, mastery and application ability directly reflect the country's scientific and technological level and economic strength, and are also a symbol of a country's comprehensive national strength and the speed of civilization progress. Therefore, the development and research of new materials is the forerunner of the development of material science and the cornerstone of the six high-tech fields in the 21st century. In recent years, due to the successful cross-infiltration of v...

Claims

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Application Information

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IPC IPC(8): B22F7/02
CPCB22F7/02B22F2007/045B22F2998/10B22F3/004B22F3/03B22F3/10B22F3/26
Inventor 马运柱刘超刘文胜刘阳杨玉玲伍镭王涛
Owner CENT SOUTH UNIV
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