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Magnesium silicon nitride powder and preparation method thereof

A technology of silicon magnesium nitride and silicon dioxide powder, applied in the field of silicon magnesium nitride, can solve the problems of complex process, long preparation cycle, high energy consumption, etc., and achieve abundant raw material resources, low production cost and simple production process Effect

Inactive Publication Date: 2017-06-30
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Whether it is direct nitriding method, carbothermal reduction method or self-propagating synthesis technology, they all have common disadvantages, such as long preparation cycle, high energy consumption and complicated process.

Method used

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  • Magnesium silicon nitride powder and preparation method thereof

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Effect test

Embodiment 1

[0021] A magnesium silicon nitride powder and a preparation method thereof. With 8~13wt% magnesium powder, 15~18wt% silicon dioxide and 71~75wt% inorganic salt as raw materials, mix for 0.5~1h; Raise the temperature to the intermediate temperature at a rate of 1 min; then raise the temperature to the firing temperature at a rate of 3~5°C / min, keep it warm for 1~7h, cool with the furnace, wash, and dry to obtain magnesium silicon nitride powder.

[0022] The firing temperature is 900-1100°C, and the temperature difference between the intermediate temperature and the firing temperature is 100-160°C.

[0023] The particle size of the magnesium powder is 0.02-44 μm.

[0024] The particle size of the silica powder is 44-74 μm.

[0025] The inorganic salt is sodium chloride.

[0026] The solution used for the washing is hydrochloric acid.

Embodiment 2

[0028] A magnesium silicon nitride powder and a preparation method thereof. It is the same as Example 1 except the following:

[0029] The particle size of the silica powder is 0.02-44 μm.

[0030] The inorganic salt is potassium chloride.

[0031] The solution used for the washing is sulfuric acid.

Embodiment 3

[0033] A magnesium silicon nitride powder and a preparation method thereof. It is the same as Example 1 except the following:

[0034] 02μm。 The particle size of the silica powder ≤ 0. 02μm.

[0035] The inorganic salt is a mixture of sodium fluoride and potassium fluoride.

[0036] The solution used for the washing is nitric acid.

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Abstract

The invention relates to magnesium silicon nitride powder and a preparation method thereof. The technical scheme comprises the following steps: using 10-15 wt% of magnesium powder, 15-25 wt% of silica and 65-75 wt% of inorganic salt as raw materials and mixing the raw materials for 0.5-1 h; then under the conditions of 0.1-1 MPa and nitrogen atmosphere, heating to a medium temperature at the rate of 5-10 DEG C / min; and heating to firing temperature at the rate of 3-5 DEG C / min, carrying out thermal insulation for 1-7 h, cooling with a furnace, washing, and drying to prepare the magnesium silicon nitride powder. The firing temperature is 900-1300 DEG C, and the temperature difference between the medium temperature and the firing temperature is 100-200 DEG C. The preparation method of the invention has characteristics of simple production process, short production period, rich resources of raw materials and low production cost. The prepared magnesium silicon nitride powder has uniform particle size and single morphology.

Description

technical field [0001] The invention belongs to the technical field of silicon magnesium nitride. It specifically relates to a magnesium silicon nitride powder and a preparation method thereof. [0002] technical background [0003] Silicon magnesium nitride has a crystal structure similar to that of aluminum nitride, that is, it is composed of Mg 2+ and Si 4+ Ions replace Al 3+ s position. Silicon-magnesium nitride materials have high theoretical thermal conductivity, and have great potential in the fields of heat dissipation and packaging materials for high-power electrical appliances and high-speed circuits. In the field of ceramic materials, silicon magnesium nitride is mainly used as a sintering aid to improve the thermal conductivity of silicon nitride ceramics. In addition, magnesium silicon nitride also has high stress strength, fracture toughness, hardness and electrical insulation, attracting more and more researchers to develop and improve its synthesis method...

Claims

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Application Information

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IPC IPC(8): C01B21/082
CPCC01B21/0602C01P2004/03
Inventor 丁军柴志南邓承继余超祝洪喜
Owner WUHAN UNIV OF SCI & TECH
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