Unlock instant, AI-driven research and patent intelligence for your innovation.

AlN reinforced magnesium lithium base composite material and preparation method thereof

A composite material, magnesium-lithium technology, applied in the field of AlN-enhanced magnesium-lithium-based composite materials and its preparation, can solve the problem of the difficulty in achieving uniform and dispersed AlN particles, the inability to continuously feed nitrogen into the magnesium-lithium melt, and the difficulty in preparation and storage And other problems, to achieve good wettability and stability, low cost, high modulus of elasticity

Active Publication Date: 2020-06-19
SHANGHAI JIAO TONG UNIV
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the preparation of ultra-light magnesium-lithium alloys, since the Li element is extremely easy to oxidize, it is necessary to use argon protection for melting in a vacuum melting furnace, and it is impossible to continuously feed nitrogen into the magnesium-lithium melt.
In addition, both lithium powder and magnesium-lithium alloy powder are easily oxidized and difficult to prepare and store. The preparation method using powder metallurgy requires the entire process to be carried out under the protection of an inert atmosphere, which is costly and has potential safety hazards
Adding AlN particles directly to the magnesium-lithium alloy melt is difficult to achieve uniform and dispersed AlN particles in the melt

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment relates to an AlN-reinforced magnesium-lithium-based composite material. In the magnesium-lithium-based composite material, the mass percentages of each component are: Li 10%, Zn 1%, Ca 0.1%, AlN particles 7%, and the balance for Mg. The particle diameter of the AlN particles is 1 μm.

[0029] This embodiment relates to a method for preparing AlN-reinforced magnesium-lithium-based composite materials. The process includes three stages: the preparation of AlN / magnesium chip prefabricated blocks, the argon-protected smelting process and the plastic deformation process:

[0030] Preparation of AlN / magnesium chips prefabricated blocks: AlN particles and magnesium chips are mixed and ball milled on a planetary ball mill to prepare mixed powder. The mass ratio of AlN particles to magnesium chips is 1:1; the composite powder obtained after ball milling is hot-pressed (150°C) to obtain prefabricated blocks.

[0031] Argon protection melting process: In the vac...

Embodiment 2

[0035]This embodiment relates to an AlN-reinforced magnesium-lithium-based composite material. In the magnesium-lithium-based composite material, the mass percentages of each component are: Li 15%, Zn 5%, Ca 0.2%, AlN particles 13%, and the balance for Mg. The particle diameter of the AlN particles is 0.05 μm.

[0036] This embodiment relates to a method for preparing AlN-reinforced magnesium-lithium-based composite materials. The process includes three stages: the preparation of AlN / magnesium chip prefabricated blocks, the argon-protected smelting process and the plastic deformation process:

[0037] Preparation of AlN / magnesium chips prefabricated blocks: AlN particles and magnesium chips are mixed and ball-milled on a planetary ball mill to prepare mixed powder, the mass ratio of AlN particles to magnesium chips is 1:5; the composite powder obtained after ball milling is hot-pressed (100°C) to obtain prefabricated blocks.

[0038] Argon protection melting process: In the ...

Embodiment 3

[0042] This embodiment relates to an AlN-reinforced magnesium-lithium-based composite material. In the magnesium-lithium-based composite material, the mass percentages of each component are: Li 11%, Zn 2%, Ca 0.5%, AlN particles 3%, and the balance for Mg. The particle diameter of the AlN particles is 0.5 μm.

[0043] This embodiment relates to a method for preparing AlN-reinforced magnesium-lithium-based composite materials. The process includes three stages: the preparation of AlN / magnesium chip prefabricated blocks, the argon-protected smelting process and the plastic deformation process:

[0044] Preparation of AlN / magnesium chips prefabricated blocks: Mix AlN particles and magnesium chips on a planetary ball mill to prepare mixed powder, the mass ratio of AlN particles to magnesium chips is 2:1; hot press the composite powder obtained after ball milling (250°C) to obtain prefabricated blocks.

[0045] Argon protection melting process: In the vacuum melting furnace, afte...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
densityaaaaaaaaaa
elastic modulusaaaaaaaaaa
Login to View More

Abstract

The invention discloses an AlN reinforced magnesium lithium base composite material and a preparation method thereof. The composite material comprises the following components of 10-15% of Li, 1-5% ofZn, 0.1-0.5% of Ca, 3-13% of AlN, and the balance Mg. The preparation method comprises the following steps of preparation of AlN / Mg chip precast blocks, argon shielded melting and plastic deformation, wherein the AlN / magnesium chip precast blocks are prepared through a ball milling and hot pressing method; the step of argon shielded melting comprises the following procedures of adding the AlN / magnesium chip precast blocks to a melted metal raw material, mechanically stirring and ultrasonically treating the melt, and carrying out casting; and the step of plastic deformation includes homogenization and plastic deformation. By preparing the AlN / magnesium chip precast blocks, and mechanically stirring and ultrasonically treating the melt, AlN particles are uniformly dispersed in a magnesium lithium substrate, and the AlN reinforced magnesium lithium base composite material with high strength and elastic modulus is obtained after an ingot is subjected to subsequent plastic deformation. TheAlN reinforced magnesium lithium base composite material and the preparation method thereof are simple in technological process, are suitable for batch production and show wide application prospectsin the field of aerospace.

Description

technical field [0001] The invention relates to the field of metal-based composite materials and its preparation; in particular, it relates to an AlN-reinforced magnesium-lithium-based composite material and a preparation method thereof. Background technique [0002] Magnesium-lithium alloy as the lowest density (1.30g / cm 3 -1.60g / cm 3 ) metal structural materials have good application prospects in the aerospace field. However, compared with other mature structural materials, magnesium-lithium alloys have disadvantages such as low absolute strength and low elastic modulus, which limit the application range of magnesium-lithium alloys. Generally speaking, as the Li content in Mg-Li alloys increases, the plasticity of the alloy increases and the strength decreases. A certain Li content is a necessary condition for magnesium-lithium alloys to exhibit ultra-lightness. Therefore, it is particularly important to strengthen ultra-light magnesium-lithium alloys with high Li (Li ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C32/00C22C1/10C22C1/02
CPCC22C23/00C22C32/0068C22C1/1036C22C1/1015C22C1/1047
Inventor 吴国华冀浩刘文才丁德华廖光澜
Owner SHANGHAI JIAO TONG UNIV