Preparation method of high-electromagnetic-shielding hollow micro-sphere enhanced AZ91 magnesium matrix composite

A technology of hollow microspheres and electromagnetic shielding, which is applied in the field of preparation of hollow microspheres reinforced AZ91 magnesium-based composite materials, can solve problems such as hollow microsphere structure damage, and achieve recycling, high electromagnetic shielding performance, and high electromagnetic shielding The effect of potency

Inactive Publication Date: 2014-10-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the structure of hollow microspheres is seriously damaged in the preparation process of existing composite materials, and provides a method for preparing hollow microspheres reinforced AZ91 magnesium-based composite materials with high electromagnetic shielding

Method used

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  • Preparation method of high-electromagnetic-shielding hollow micro-sphere enhanced AZ91 magnesium matrix composite
  • Preparation method of high-electromagnetic-shielding hollow micro-sphere enhanced AZ91 magnesium matrix composite
  • Preparation method of high-electromagnetic-shielding hollow micro-sphere enhanced AZ91 magnesium matrix composite

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specific Embodiment approach 1

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

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

[0022] 2. Then in Ca(OH) 2 Add the hollow microspheres and water treated in step 1 into the solution to obtain a mixed solution, and react at a constant temperature of 95°C for 12 hours. After the reaction, the hollow microspheres are washed in a sufficient amount...

specific Embodiment approach 2

[0025] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the mass ratio of quicklime to water in step 1 is 1:8-10. Others are the same as in the first embodiment.

specific Embodiment approach 3

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

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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 method for preparing a 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 security of information and the protection of electromagnetic pollution. Fly ash, which is 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, the environmental pollution is reduced, and on the other hand, the prepared composite material has a certain electromagnetic shielding performance by creating holes in the material. [0003] However, in magnesium-based composites, 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 preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C23/00
Inventor 王晓军孟令龙丁超胡小石吴昆
Owner HARBIN INST OF TECH
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