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Method for synthesizing blocky magnesium-based nano composite material by self-organized reaction

A technology of nanocomposite materials and eutectic structure, applied in the direction of nanotechnology, can solve the problems of uneven distribution of reinforcement phase, increase of process complexity and cost, difficulty in microstructure control, etc., achieve high interface connection strength and save energy , the effect of uniform distribution

Inactive Publication Date: 2011-09-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above preparation process needs to be carried out in the magnesium melt, and the volatilization of magnesium cannot be avoided. It is difficult to control the microstructure, and usually the melt needs to be stirred to avoid uneven distribution of the reinforcing phase, which greatly increases the process. complexity and cost

Method used

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  • Method for synthesizing blocky magnesium-based nano composite material by self-organized reaction
  • Method for synthesizing blocky magnesium-based nano composite material by self-organized reaction
  • Method for synthesizing blocky magnesium-based nano composite material by self-organized reaction

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Experimental program
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example

[0036] 1) Preparation conditions and equipment

[0037] The matrix material selected is magnesium powder with a purity of 99.8%, and the metal oxide powder with a purity of 99.0% to 99.9% is selected as the reinforcing phase material. Sintering adopts controllable atmosphere PID intelligent control tube furnace, phase identification adopts X-ray diffractometer (XRD), microstructure observation and analysis adopts environmental electron microscope (SEM; LEO 1450VP) and transmission electron microscope (TEM; Philips CM 120 ), and the hardness was tested using a microhardness tester (Buehler 2103, IL).

[0038] 2) Selection of sintering process

[0039] The sintering temperature is 450-630°C. Select different sintering temperatures according to different material systems, and keep them warm for 30-90 minutes. Then, the samples are cooled or quenched in the furnace. See the examples for specific parameters.

example 1

[0041] Table 1 shows the selected material system and composition ratio:

[0042] Table 1 The ratio of Mg-CuO

[0043]

[0044] The powder is cold-pressed under a pressure of 500 MPa.

[0045] Under the protection of argon, the green body 1 was kept at 450°C for 90 minutes, and cooled with the furnace. According to the XRD phase identification, the sintered sample contained three phases of Mg, MgO and Cu, and MgO was evenly distributed among the Mg particles. At the interface, the observation and analysis results of the transmission electron microscope show that the MgO exists at the interface in the form of one-dimensional nanowires, ( figure 1 ).

[0046] Green body 2 and green body 3 were kept at 550°C for 60 minutes and then cooled and quenched in the furnace respectively. According to XRD phase analysis, it was found that the two samples after sintering contained Mg, MgO and Mg 2 Three phases of Cu; through scanning electron microscopy, it was found that there were ...

example 2

[0049] Table 2 shows the selected material system and composition ratio:

[0050] Table 2 The ratio of Mg-NiO

[0051]

[0052] The powder was cold-pressed under the pressure of 400MPa and 500MPa respectively for comparison.

[0053] Under the protection of argon, the green body was kept at 550°C for 60 minutes and then rapidly cooled. XRD phase analysis found that the sintered sample contained Mg, MgO and Mg 2 There are three phases of Ni; through scanning electron microscope observation, it is found that two kinds of nano-eutectic structures with different structures are formed in this sample ( image 3 ), where a) is the nanoeutectic structure formed around Mg particles; b) is the nanoeutectic structure formed around MgO particles.

[0054] There is no difference in microstructure after sintering of green compacts with different molding pressures.

[0055] The various nano-eutectics formed by the reaction not only serve as the reinforcing phase of the matrix material,...

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Abstract

The invention discloses a method for synthesizing a blocky magnesium-based nano composite material by a self-organized reaction, which comprises the following steps: (1) uniformly mixing Mg metal powder and 20 to 30 mass percent of metal oxide powder, wherein the metal oxide is the oxide of a metal having lower reducibility than magnesium; (2) forming the mixture in a mold by cold pressing, wherein the forming pressure is 400 to 600MPa; (3) sintering, wherein the temperature is constantly kept between 450 to 630 DEG C during sintering, and a flowing inert gas (such as argon and mixed gase of CO2 and SF6) is used for protection in a sintering process to prevent magnesium from being oxidized; and (4) at the end of thermal insulation, subjecting a sample to furnace cooling or quenching to obtain different intermetallic compound nano eutectic structures. In the invention, the process and equipment are simple, energy is saved, the reinforcing phase is uniformly distributed, the bonding with interface of a substrate material is firm, and cleanness and environment friendliness are guaranteed. The final hardness of the material is improved greatly, the magnetic nano particles synthesized in situ have excellent soft magnetic property, and the nano lines or nano particles formed by the reaction have high sterilizing performance.

Description

technical field [0001] The invention belongs to a novel preparation method of a magnesium-based nanocomposite material. It specifically relates to a method for synthesizing one-dimensional magnesium oxide nanowires or nanoeutectics in a magnesium matrix by using in-situ chemical reaction and self-organized phase transition. The method is especially suitable for preparing magnesium-based nanocomposites with excellent mechanical properties, physical properties such as electromagnetic properties and biological sterilization function. Background technique [0002] Magnesium-based composites have low density, high specific strength and specific stiffness, good dimensional stability, low-temperature superplasticity, good wear resistance, excellent damping and shock absorption and electromagnetic shielding performance, and their comprehensive performance is better than that of aluminum-based composites. Composite materials, and easy to recycle and reuse, have extremely broad appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C23/00B82Y40/00
Inventor 马南钢吴恒亮郎静龙跃平金莹
Owner HUAZHONG UNIV OF SCI & TECH
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