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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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 The method of Si powder makes it solve the problems of long time, low efficiency, and many impurities, and can quickly prepare high-purity Mg 2 Si powder

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0029] (1) raw material Mg powder (99.9%) and Si (99.99%) powder are mixed by the weight percentage of 1.817: 1, in the vacuum glove box that has been filled with an atmospheric pressure high-purity argon, pack into ball mill jar, ball-to-material ratio is 48:1. Then on the planetary ball mill with 255 rpm ball milling for 1 hour;

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

[0031] (3) Put the sealed jar into a box furnace heated to 700° C. to keep warm for 1 hour, then take it out and quickly cool it 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 completely transformed into a single-phase Mg 2 Si. It is identified by chemical analysis that the impurity Fe content is lower than 0.01wt%.

Embodiment 2

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

[0034] (2) prepare the Mg that obtains complete reaction as described in embodiment 1 (2) and (3) 2 Si powder, impurity Fe content is lower than 0.022wt%.

Embodiment 3

[0036] (1) Prepare raw material powder as described in Example 1 (1). Then on planetary ball mill with 255 rev / min rotating speed ball mills 2 hours;

[0037] (2) prepare the Mg that obtains complete reaction as described in embodiment 1 (2) and (3) 2 Si powder, impurity Fe content is lower 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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