A kind of preparation method of high electromagnetic shielding hollow microsphere reinforced az91 magnesium matrix composite material

Abstract

The invention relates to a preparation method of a high-electromagnetic-shielding hollow micro-sphere enhanced AZ91 magnesium matrix composite and relates to a preparation method of a hollow micro-sphere enhanced AZ91 magnesium matrix composite. The preparation method is used for solving the problems that structures of hollow micro-spheres are seriously damaged in the preparation process of an existing composite material. The method comprises the following steps: firstly, adding water into quick lime to react, aging, and calculating the weight of Ca(OH)2 and water in a Ca(OH)2 solution; secondly, adding the hollow micro-spheres and water to obtain a mixed solution, cleaning the hollow micro-spheres after reaction, and drying to obtain surface-coated hollow micro-sphere particles; thirdly, melting an AZ91 magnesium alloy, removing surface oxide scales, cooling, preserving heat, adding the hollow micro-sphere particles, stirring, rising temperature, and molding to obtain the magnesium matrix composite of which the hollow micro-sphere surface appearance is relatively complete. According to the prepared composite disclosed by the invention, the appearance of the hollow micro-spheres in the composite is kept relatively well, and the electromagnetic shielding effectiveness reaches 79-82dB. The preparation method disclosed by the invention is used for preparing the magnesium matrix composite.

Description

Technical field

[0001] The invention relates to a preparation method of hollow microsphere reinforced AZ91 magnesium-based composite material. Background technique

[0002] In recent years, due to the development of information technology, higher requirements have been put forward for the safety of information and the protection of electromagnetic pollution. Fly ash, as a waste produced by burning coal in power plants, has a hollow internal structure and has been widely used as a filler for metal matrix composites in recent years. On the one hand, environmental pollution is reduced, and on the other hand, the prepared composite material has certain electromagnetic shielding performance by making holes in the material.

[0003] However, in magnesium-based composite materials, due to the serious chemical reaction between the magnesium matrix and the hollow microspheres, the structure of the hollow microspheres is severely damaged during the composite material preparation process (su...

Examples

specific Embodiment approach 1

[0020] Specific implementation mode 1: The preparation method of the hollow microsphere reinforced AZ91 magnesium-based composite material with high electromagnetic shielding in this embodiment is carried out according to the following steps:

[0021] 1. Take the hollow beads with an average particle size of 100 microns, wash them with water, and then dry the hollow beads at 105°C for use; add quicklime to the beaker, add water to the beaker and react for 30 minutes, then wrap it with plastic film Hold the mouth of the beaker, age for 12 hours, filter with a 200-mesh sieve, weigh the mass of slaked lime particles remaining on the sieve, and calculate Ca(OH) 2 Ca(OH) in solution 2 The quality of the water and the quality of the water;

[0022] Second, then in Ca(OH) 2 The hollow microbeads and water treated in step 1 are added to the solution to obtain a mixed solution. The mixture is reacted at 95°C for 12 hours. After the reaction, the hollow beads are washed in sufficient distille...

specific Embodiment approach 2

[0025] Specific embodiment two: this embodiment is different from specific embodiment one in that the mass ratio of quicklime to water in step one is 1:8-10. Others are the same as the first embodiment.

specific Embodiment approach 3

[0026] Specific embodiment three: this embodiment is different from specific embodiment one or two in: the Ca(OH) described in step two 2 Ca(OH) in solution 2 The mass ratio of the hollow microbeads is 1:5-8. Others are the same as the first or second embodiment.

Technical field

[0001] The invention relates to a preparation method of hollow microsphere reinforced AZ91 magnesium-based composite material. Background technique

[0002] In recent years, due to the development of information technology, higher requirements have been put forward for the safety of information and the protection of electromagnetic pollution. Fly ash, as a waste produced by burning coal in power plants, has a hollow internal structure and has been widely used as a filler for metal matrix composites in recent years. On the one hand, environmental pollution is reduced, and on the other hand, the prepared composite material has certain electromagnetic shielding performance by making holes in the material.

[0003] However, in magnesium-based composite materials, due to the serious chemical reaction between the magnesium matrix and the hollow microspheres, the structure of the hollow microspheres is severely damaged during the composite material preparation process (su...

Examples

specific Embodiment approach 1

[0020] Specific implementation mode 1: The preparation method of the hollow microsphere reinforced AZ91 magnesium-based composite material with high electromagnetic shielding in this embodiment is carried out according to the following steps:

[0021] 1. Take the hollow beads with an average particle size of 100 microns, wash them with water, and then dry the hollow beads at 105°C for use; add quicklime to the beaker, add water to the beaker and react for 30 minutes, then wrap it with plastic film Hold the mouth of the beaker, age for 12 hours, filter with a 200-mesh sieve, weigh the mass of slaked lime particles remaining on the sieve, and calculate Ca(OH) 2 Ca(OH) in solution 2 The quality of the water and the quality of the water;

[0022] Second, then in Ca(OH) 2 The hollow microbeads and water treated in step 1 are added to the solution to obtain a mixed solution. The mixture is reacted at 95°C for 12 hours. After the reaction, the hollow beads are washed in sufficient distille...

specific Embodiment approach 2

[0025] Specific embodiment two: this embodiment is different from specific embodiment one in that the mass ratio of quicklime to water in step one is 1:8-10. Others are the same as the first embodiment.

specific Embodiment approach 3

[0026] Specific embodiment three: this embodiment is different from specific embodiment one or two in: the Ca(OH) described in step two 2 Ca(OH) in solution 2 The mass ratio of the hollow microbeads is 1:5-8. Others are the same as the first or second embodiment.

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