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A method for preparing hollow sphere metal matrix lightweight composite material by powder injection molding

A technology of powder injection molding and composite materials, which is applied in metal processing equipment, transportation and packaging, etc. It can solve problems such as inability to mass produce, poor forming ability, and lower density, and achieve high production efficiency, low material density, and good consistency Effect

Active Publication Date: 2020-12-22
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for preparing hollow sphere metal matrix composite materials by powder injection molding, aiming at the problems of high cost, low precision, poor forming ability, complex process and inability to mass-produce hollow sphere metal matrix composite materials, The obtained metal foam matrix composite material not only improves the precision and production efficiency, but also reduces the density of the material, realizes the lightweight of the composite material, and can produce parts with more complex structures

Method used

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  • A method for preparing hollow sphere metal matrix lightweight composite material by powder injection molding
  • A method for preparing hollow sphere metal matrix lightweight composite material by powder injection molding

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Embodiment 1

[0037] see figure 1 , The hollow spheres used in this embodiment are SiC hollow spheres with a particle size of 0.2 mm, and the metal matrix used is aluminum powder with a particle size of 20 μm.

[0038](1) Mix SiC hollow spheres and aluminum powder at a volume ratio of 3:2, then add 8% by weight of polyethylene glycol to obtain a premix, put the premix into a three-axis multifunctional hydraulic lift mixer at 80r Stir for 1 hour at a speed of 1 / min; then add the mixed premix into the mixer, knead at 200°C for 1 hour to make a uniform feed, and then put the feed into granulation to make feed injection granulation, the granulation temperature is 150°C;

[0039] (2) Preheat the feed granules at 200°C for 1 hour, put the preheated feed granules into the injection molding machine and perform rapid injection molding under the pressure of 80MPa and the injection speed of 60g / s, and demould after cooling Obtain a green body with a specific shape;

[0040] (3) First put the blank...

Embodiment 2

[0043] see figure 1 , the hollow spheres selected in this embodiment are Al 2 o 3 Hollow spheres are mixed hollow spheres with a volume ratio of 1:5, and the metal base used is iron powder with a particle size of 15 μm.

[0044] (1) Al 2 o 3 Mix hollow balls and iron powder at a volume ratio of 1:1, add 6% by weight polyethylene glycol binder to obtain a premix, put the premix into a three-axis multifunctional hydraulic lift mixer at 60r / min Stir at a high speed for 0.5h; then add the mixed premix into the mixer, knead at 500°C for 2 hours to make a uniform feed, and then put the feed into granulation to make feed injection pellets , the granulation temperature is 200°C;

[0045] (2) Preheat the feed granules at a temperature of 500°C for 1 hour, put the preheated feed granules into the injection molding machine, and perform rapid injection molding under a pressure of 100 MPa and an injection speed of 80 g / s, and demould after cooling Obtain a green body with a specific...

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Abstract

The invention discloses a method for preparing hollow sphere metal matrix lightweight composite material by powder injection molding. The method comprises stirring and mixing metal or alloy powder, hollow sphere and organic binder components to prepare injection granules, and then It is injected into a mold under a certain temperature and pressure for injection molding, and after cooling, it is demolded to obtain a green product with a specific shape, and the green body is debonded and sintered to prepare a metal matrix composite material. The metal matrix composite material prepared by the method can not only reduce the density significantly, but also can ensure the dimensional accuracy and batch consistency of the material, and solve the problems of high cost, high density and difficulty in mass production of general metal matrix composite materials, and the preparation process is simple at the same time. , It can be formed at one time, and it can adapt to a wide range of types and sizes of hollow spherical particles. It can realize automatic continuous production and high production efficiency.

Description

technical field [0001] The invention belongs to the field of metal-based lightweight composite material preparation, in particular to a method for preparing hollow spherical metal-based lightweight composite materials by powder injection molding. Background technique [0002] Metal matrix composites are composite materials that use metal or alloy as the matrix and fibers, whiskers, particles, etc. as reinforcements. In terms of mechanical properties, they have high transverse and shear strength, and good comprehensive properties such as toughness and fatigue. At the same time, it also has the advantages of thermal conductivity, electrical conductivity, wear resistance, small thermal expansion coefficient, good damping, no moisture absorption, no aging and no pollution, but it also has disadvantages such as high cost, high density and complicated preparation process. For example, reinforcements such as fibers and whiskers are expensive and the preparation process is complicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11B22F3/22B22F1/00
CPCB22F3/1025B22F3/11B22F3/225B22F1/102
Inventor 张振王琪李桂珍
Owner NANJING INST OF TECH
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