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Method for synthesizing ultra-fine azotized magnesium powder with combustion

A magnesium nitride and powder technology, which is applied in the field of preparing ultrafine magnesium nitride powder by a self-propagating combustion synthesis method, can solve the problems of high nitrogen pressure, fast reaction speed, unfavorable products, etc., achieves low cost, ensures uniformity and The effect of purity and low energy consumption

Inactive Publication Date: 2010-05-19
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the product contains more impurities, and the nitrogen pressure used in the reaction is relatively high, and the reaction speed is fast, which is not conducive to obtaining a more uniform product.
In addition to the above reports, there is currently no information on the use of pure magnesium powder for combustion synthesis of Mg 3 N 2 Powder literature and patent reports

Method used

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  • Method for synthesizing ultra-fine azotized magnesium powder with combustion
  • Method for synthesizing ultra-fine azotized magnesium powder with combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take Mg powder with an average particle size of 10 μm and put it directly into a porous graphite crucible covered with carbon felt at the bottom, so that the bulk density is about 1.0 g / cm 3 , put a spiral tungsten wire on the upper layer of the material, the diameter of the tungsten wire is 0.5mm, and put them together into the combustion synthesis reactor; after vacuuming, fill high-purity nitrogen, ammonia and high-purity Ar gas mixed gas, the total pressure reaches 0.5MPa, of which the partial pressure of ammonia gas is 0.2MPa, and the partial pressure of Ar gas is 0.1MPa; the spiral tungsten wire is passed with a pulse current of 10-30A for 5-10s to generate heat. The tungsten wire induces the raw material Mg powder to undergo a self-propagating combustion synthesis reaction. The highest combustion temperature reached during the reaction process is 1156°C. The combustion reaction lasts for 30 minutes. After the reaction is completed and cooled to room temperature, t...

Embodiment 2

[0031] Take Mg powder with an average particle size of 100 μm and put it directly into a porous graphite crucible covered with carbon felt at the bottom, so that the bulk density is about 2.5g / cm 3, put a spiral tungsten wire on the upper layer of the material, the diameter of the tungsten wire is 0.5mm, and put them together into the combustion synthesis reactor; after vacuuming, fill the mixture of high-purity nitrogen and high-purity Ar gas from the bottom of the reactor gas, the total pressure reaches 5.0MPa, and the partial pressure of Ar gas is 1.0MPa; the spiral tungsten wire is passed with a pulse current of 10-30A, and the duration is 5-10s, so that the heating tungsten wire induces the raw material Mg powder to undergo a self-propagating combustion synthesis reaction , the highest combustion temperature reached during the reaction is 1368°C, and the combustion reaction lasts for 30 minutes. After the reaction is completed, after cooling to room temperature, the gas in...

Embodiment 3

[0033] Take Mg powder with an average particle size of 50 μm, and put it directly into a porous graphite crucible covered with carbon felt at the bottom, so that the bulk density is about 1.5g / cm 3 , place carbon paper on the upper layer of the material, and put them together into the combustion synthesis reactor; after vacuuming, fill high-purity N from the bottom of the reactor 2 gas, high purity H 2 gas and Ar gas mixture, the total pressure reaches 4.0MPa, the Ar gas partial pressure is 1.0MPa, high-purity H 2 The gas partial pressure is 0.5MPa; the carbon paper is passed a pulse current of 10-30A for a duration of 5-10s, so that the heating carbon paper induces the raw material Mg powder to undergo a self-propagating combustion synthesis reaction, and the highest combustion temperature reached during the reaction process The temperature is 1297°C, and the combustion reaction lasts for 30 minutes. After the reaction is completed and cooled to room temperature, the gas in ...

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Abstract

The present invention belongs to the field of inorganic non-metallic materials and relates to a preparation method of magnesium nitride powder, in particular to a synthetic method of self-propagatingcombustion that is used for preparing ultra-fine magnesium nitride powder. Magnesium powder with the apparent density of 1.0 to 3.0 g / cm<3> is filled into a porous reactor with a carbon felt on the bottom; then the porous reactor is arranged in a high-pressure reactor that is vacuumized and filled with nitrogen, the mixed gas of nitrogen and argon, or the mixed gas of nitrogen, hydrogen and argon;the total pressure is controlled between 0.5MPa and 5MPa; then the raw material of magnesium powder is induced for the synthesis reaction of self-propagating combustion; the highest temperature in the reaction process reaches1000 to 1400 DEG C; the loose massive product can be prepared after the completion of the synthesis reaction; and the magnesium nitride powder with the grain size between 3 Mu m and 5 Mu m can be prepared after fine grinding. The preparation method has the advantages of simple process, short production cycle, high yield, low energy consumption and low cost.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials and relates to magnesium nitride (Mg 3 N 2 ) powder preparation method, especially the preparation of superfine magnesium nitride powder by self-propagating combustion synthesis method. Background technique [0002] Mg 3 N 2 It has a wide range of applications, such as additives for high-strength, high thermal conductivity, corrosion-resistant, wear-resistant, and high-temperature-resistant nitride ceramics (such as cubic boron nitride); foaming agents for preparing special alloys, special ceramics materials and special glass; used to catalyze cross-linking of polymers; used to recycle nuclear waste, etc. [0003] Currently Mg 3 N 2 The powder preparation methods mainly include: magnesium powder reacting with nitrogen in nitrogen plasma flow, magnesium coil explosion method under nitrogen atmosphere, low pressure chemical vapor deposition, magnesium powder and nitrogen combust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/65C04B35/622C01B21/06
Inventor 李江涛裴军梅林杨筠林志明杨术亮杜吉胜宋英
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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