Method for preparing nano particle enhanced magnesium-based composite material

A composite material and nanoparticle technology, applied in the field of magnesium-based composite material preparation, can solve the problems of limited phase growth of control clusters and particles, affect the performance of composite materials, runaway combustion, etc., achieve flexible operation and production organization, improve Thermodynamics and Kinetics, Effect of Reducing Magnesium Oxidation Burning Loss

Inactive Publication Date: 2011-07-13
JIANGSU UNIV
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Problems solved by technology

[0003] There are two main methods for preparing particle-reinforced magnesium-based composites by in-situ synthesis: (1) mixed salt and melt direct reaction synthesis, for example: Chinese Patent: 03116169.3, Invention Name: "Preparation of In-Situ Reinforced Magnesium-Based Composite Material Process with Mixed Salts" proposes to prepare magnesium-based composite materials by using mixed salt and melt reaction method, that is, the mixed salt is directly added to the magnesium-based melt, and then cast after stirring The in-situ magnesium-based composite material is obtained. The disadvantage of this method is that the mixed salt is added concentratedly, the local reaction is too severe, the temperature is difficult to control, the particle phase grows and the cluster is serious, and it is easy to cause the oxidation of magnesium at high temperature, combustion loss and gas absorption. ; (2) Prefabricated master alloy-secondary synthesis method, for example: Chinese patent: CN 101177742A, title of invention: "Method for preparing TiB2 particle-reinforced magnesium-based composite material in situ" proposes to use prefabricated master alloy Alloy method, first in the aluminum melt through the in-situ reaction to prepare the parent alloy containing the particle reinforcement phase, and then add it to the magnesium melt to make the composite material; the advantage of the second method is that the in-situ reaction and magnesium The melt is separated to prevent the burning of the magnesi

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  • Method for preparing nano particle enhanced magnesium-based composite material
  • Method for preparing nano particle enhanced magnesium-based composite material
  • Method for preparing nano particle enhanced magnesium-based composite material

Examples

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Embodiment 1

[0032] Implementation example 1: preparation (Al 3 Zr+ZrB 2 ) p / 60%Mg-30%Al composite material

[0033] Raw materials: matrix magnesium metal, pure aluminum; reaction salt: K 2 ZrF 6 -KBF 4 Powder, refining degassing agent and slag removal agent;

[0034] The preparation process is as follows:

[0035] (1) Metal smelting and powder preparation:

[0036] Put 2Kg of pure Al into a crucible, melt it in a 25kW resistance furnace and heat it up to 900°C, degas and remove slag; all the reagents used are fully dried at 250°C, of ​​which K 2 ZrF 6 -KBF 4 , ground into fine powder (particle size less than 100nm), weighed according to 30% of the theoretical weight of the particle-reinforced phase, and then wrapped with aluminum foil for use.

[0037] 4Kg of pure magnesium is melted to 720°C in another crucible melting furnace filled with argon, and at the same time, 0.15% calcium is added to the melt to prevent flames, and NaCl, KCl and MgCl are used to 2 Mix fl...

Embodiment 2

[0043] Implementation Example 2: Preparation of TiB 2 Particle Reinforced Magnesium Alloy Matrix Composites

[0044] Raw material: matrix magnesium alloy (Mg-11%Al-0.5%Zn-0.2%Mn); reaction salt: K 2 TiF 6 -KBF 4 Powder, refining degassing agent and slag removal agent;

[0045] The preparation process is as follows:

[0046] (1) Metal smelting and powder preparation:

[0047] Mixed salt reagents are fully dried at 250°C to 300°C, of ​​which K 2 TiF 6 -KBF 4 , ground into fine powder (particle size less than 100 mesh), weighed according to 10% of the theoretical weight of the particle-reinforced phase, and then wrapped with aluminum foil for use.

[0048] 2Kg of pure magnesium alloy is melted to 750°C in another crucible melting furnace filled with argon, and at the same time, 0.15% calcium is added to the melt to prevent flames, and NaCl, KCl and MgCl are used to 2 Mix flux.

[0049] (2) In situ reaction to prepare aluminum-based alloys containing particle-reinf...

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Abstract

The invention discloses a method for preparing a nano particle enhanced magnesium-based composite material, and relates to the technical field of magnesium-based composite material preparation. A two-step synthesis method is adopted in the method, wherein in the first step, a master alloy containing nano enhanced particles is generated by in-situ reaction in an aluminum melt under the composite action of a pulse magnetic field and a pulse electric field; and in the second step, after magnesium or magnesium alloy melt is melted, the prepared master alloy is added into the melt, and uniform mixing of the master alloy in the melt and dispersion of the particles are promoted by the external electric and magnetic fields. The method has the main advantages that: the particle phase in the magnesium-based composite material is controlled in nano scale and dispersed uniformly; compared with a one-step direct synthesis method, the number of the particle phase in the composite material prepared by adopting the method is easily accurately regulated and controlled, the melting time of the magnesium melt is shortened, and oxidation and combustion loss of the magnesium are controlled; and in addition, low air suction amount of the magnesium melt is favorable for controlling the tissue defects such as loose, hole shrinkage and the like of the magnesium-based composite material.

Description

technical field [0001] The invention relates to the technical field of preparing magnesium-based composite materials, in particular to a method for preparing nanoparticle-reinforced magnesium-based composite materials. Background technique [0002] As the lightest metal-based structural material, magnesium-based composites have very high specific strength, specific stiffness, good high temperature resistance and damping performance, and are easy to cast and machine. They are widely used in aerospace, navigation, automobile and other industrial and military equipment manufacturing and other fields have broad application prospects; the performance of particle-reinforced magnesium-based composites is not only related to the type of reinforcing phase, but also closely related to the shape, size and distribution of the particle-reinforced phase. These factors all depend on the magnesium-based composite. The preparation method of the material; the preparation of particle-reinforce...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C23/02
Inventor 李桂荣王宏明赵玉涛张勋寅张廷旺
Owner JIANGSU UNIV
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