Method for preparing Mg2Si powder by semi-solid-state reaction

A semi-solid and powder technology, applied in the direction of metal silicide, etc., can solve the problems of long time, many impurities, low efficiency, etc., and achieve the effect of short reaction time, high purity and light pollution

Inactive Publication Date: 2008-09-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the invention is to overcome the deficiencies in the prior art, and to provide a method for preparing Mg by semi-solid reaction. 2

Method used

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  • Method for preparing Mg2Si powder by semi-solid-state reaction

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0028] Example 1:

[0029] (1) Mix the raw material Mg powder (99.9%) and Si (99.99%) powder at a weight percentage of 1.817:1, and put them into a ball mill tank in a vacuum glove box filled with high-purity argon at an atmospheric pressure. The ball-to-material ratio is 48:1. Then ball mill on a planetary ball mill at 255 rpm for 1 hour;

[0030] (2) Take the powder out of the ball mill tank in the glove box, put it into the boron nitride crucible, and put the whole into the stainless steel sealed tank for sealing.

[0031] (3) Put the sealed tank in a box furnace heated to 700°C for 1 hour, then take it out and cool it quickly in the air. Open the can to get Mg 2 Si powder. Such as figure 1 As shown, the X-ray diffraction results show that there is no residual Mg or Si, and the original mixed powder has been completely transformed into single-phase Mg 2 Si. Chemical analysis identified the impurity Fe content of less than 0.01wt%.

Example Embodiment

[0032] Example 2:

[0033] (1) Prepare raw material powder as described in Example 1(1). Then ball mill on a planetary ball mill at 255 rpm for 1.5 hours;

[0034] (2) Prepare fully reacted Mg as described in Example 1 (2) and (3) 2 The Si powder has an impurity Fe content of less than 0.022wt%.

Example Embodiment

[0035] Example 3:

[0036] (1) Prepare raw material powder as described in Example 1(1). Then ball mill on a planetary ball mill at 255 rpm for 2 hours;

[0037] (2) Prepare fully reacted Mg as described in Example 1 (2) and (3) 2 The Si powder has an impurity Fe content of less than 0.031wt%.

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Abstract

The invention discloses a preparatio method for Mg2Si powder by semi-solide reaction, belonging to material technical field, comprising following steps: firstly, mixing Mg powder and Si powder proportionally, ball milling to activate the surface of the powder and ensure even mixing; secondly, putting the mixed powder obtained in the first step into a crucible, then putting the whole crucible into a sealed jar made of alloy material to seal; thirdly, preserving heat by putting the sealed jar into a common air furnace at the temperature between seven hundred to nine hundred DEG C; fourthly, taking out the sealed jar and cooling to the ambient temperature, then obtaining loose Mg2Si powder. The preparation method for Mg2Si powder has the advantages of being fast and high efficient, and producing the Mg2Si with high purity and less impurity pollution.

Description

technical field [0001] What the present invention relates to is a kind of Mg of material technical field 2 The preparation method of Si powder, specifically a kind of preparation Mg with semi-solid reaction 2 Si powder method. Background technique [0002] Mg 2 Si is currently a thermoelectric material that has been studied more, and it also has the potential to be used as a structural material and a hydrogen storage electrode. Due to Mg 2 Si is a brittle intermetallic compound, and many studies have been devoted to obtaining nanocrystals by powder metallurgy to improve its properties. Currently Mg 2 There are five methods for preparing Si powder: [0003] 1. Melting-ball milling method. This method is actually the traditional smelting preparation of Mg 2 Extension of Si ingot. Mix high-purity Mg and Si in a graphite crucible at a temperature slightly higher than that of Mg 2 Si melting point (1080°C) is melted at a temperature of about 1100°C, and 1-3 atmospheric ...

Claims

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Application Information

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IPC IPC(8): C01B33/06
Inventor 孙锋张芳张惠义
Owner SHANGHAI JIAO TONG UNIV
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