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Preparation method of silicon nitride magnesium powder

A technology of magnesium silicon nitride and powder, applied in nitrogen and non-metallic compounds, etc., can solve the problems of high energy consumption, long production cycle, and easy product residues, etc., and achieves low energy consumption, high production efficiency, and simple equipment. Effect

Inactive Publication Date: 2019-05-21
QINGDAO CUP NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing high-temperature nitriding method for preparing magnesium silicon nitride has a long production cycle, high energy consumption, and residual silicon in the product. Therefore, it is necessary to explore a green and safe process for preparing high-quality magnesium silicon nitride powder. an urgent problem

Method used

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  • Preparation method of silicon nitride magnesium powder
  • Preparation method of silicon nitride magnesium powder
  • Preparation method of silicon nitride magnesium powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Prepare magnesium silicon nitride powder according to the following steps:

[0037] (1) Mix 200-mesh magnesium nitride powder and 200-mesh silicon powder according to the mass ratio of 20%:80%, and then mix them with absolute ethanol whose mass is 0.8 times that of the raw material powder. Mill on a ball mill for 2 hours to achieve uniform mixing; then vacuum-dry at 80°C, and pass through a 50-200 mesh sieve after drying to obtain a mixed powder;

[0038] (2) Continuously add 0.5% urea of ​​the mixed powder mass obtained in step (1) into the mixed powder, uniformly mix in a rolling ball mill for 2 minutes, then loosely pack it in a porous graphite boat, and place it in the combustion synthesis equipment , after vacuuming, fill it with 1MPa high-purity nitrogen, use titanium powder as the ignition agent, and use the electrified tungsten coil to heat the reactant to ignite the ignition agent to induce the combustion synthesis reaction; after the combustion reaction, the g...

Embodiment 2

[0041] Prepare magnesium silicon nitride powder according to the following steps:

[0042] (1) Take the raw materials according to the weight ratio, 200 mesh magnesium nitride powder is 50%, 200 mesh silicon powder is 50%; after mixing with absolute ethanol whose quality is 1.0 times of the raw material powder quality, use silicon nitride balls as the medium , milled on a planetary ball mill for 2 hours to achieve uniform mixing; then vacuum-dried at 80°C, and passed through a 50-200 mesh sieve after drying to obtain a mixed powder;

[0043] (2) Continuously add 10% urea of ​​the mass of the mixed powder obtained in step (1) into the mixed powder, uniformly mix it in a rolling ball mill for 4 minutes, then loosely pack it in a porous graphite boat, and place it in the combustion synthesis equipment , after vacuuming, fill it with 1MPa high-purity nitrogen, use titanium powder as the ignition agent, and use the electrified tungsten coil to heat the reactant to ignite the igniti...

Embodiment 3

[0046] Prepare magnesium silicon nitride powder according to the following steps:

[0047] (1) Take the raw materials according to the weight ratio, 200 mesh magnesium nitride powder is 80%, 200 mesh silicon powder is 20%, after mixing with absolute ethanol whose quality is 1.2 times of the raw material powder quality, use silicon nitride ball as the medium , milled on a planetary ball mill for 2 hours to achieve uniform mixing; then vacuum-dried at 80°C, and passed through a 50-200 mesh sieve after drying to obtain a mixed powder;

[0048](2) Add urea with 20% mass of the mixed powder obtained in step (1) into the mixed powder in stages, mix uniformly for 50 seconds in a rolling ball mill, then loosely pack it in a porous graphite boat, and place it in the combustion synthesis equipment Inside, after vacuuming, fill it with 1MPa high-purity nitrogen gas, use titanium powder as the ignition agent, and use the electrified tungsten coil to heat the reactant to ignite the ignitio...

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Abstract

The invention discloses a preparation method of silicon nitride magnesium powder, and belongs to the technical field of inorganic non-metal powder material preparation. A silicon source and a magnesium source are used as raw materials, urea and / or ethanol are used as additives, combustion synthesis reaction is carried out in a nitrogen atmosphere, and silicon nitride magnesium powder is prepared;the silicon source is one or two of silicon powder and alpha-silicon nitride powder; the magnesium source is one or two of magnesium powder and magnesium nitride powder. The preparation method of theinvention overcomes the problems of long production period, high energy consumption, easy occurrence of residual silicon in products and the like in the prior process for preparing the silicon nitridemagnesium by a direct nitridation method; the preparation method has the advantages of simple equipment, high production efficiency, rapid synthesis reaction and low energy consumption; the preparedsilicon nitride magnesium powder has good crystallinity, uniform morphology, controllable phase content, no other impurity phase, and high purity, and total impurity content is less than 1wt% and oxygen content is less than 1wt%; the subsequent steps of acid washing and purification and the like are not needed, and the product only needs to be crushed to the required particle size.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic powder materials, and in particular relates to a preparation method of silicon magnesium nitride powder. Background technique [0002] Magnesium silicon nitride has excellent properties such as high oxidation resistance, high electronic impedance, high fracture toughness, high stress strength, and high hardness. It has potential application value in high-speed circuits, high-power device heat dissipation, and packaging materials. It is expected to become a substitute for nitrogen A new generation of high thermal conductivity substrate material of aluminum oxide can also be used as a packaging material and a sintering aid for high thermal conductivity non-oxide ceramics. The oxygen content of silicon magnesium nitride determines its thermal resistance value, the lower the oxygen content, the higher the thermal resistance value; therefore, the preparation of silicon mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082
Inventor 成会明杜松墨崔巍邹艺峰
Owner QINGDAO CUP NEW MATERIALS CO LTD
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