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Magnesium silicon nitride powder based on molten-salt growth method, and preparation method of magnesium silicon nitride powder

A technology of silicon magnesium nitride and molten salt method, which is applied in the direction of chemical instruments and methods, nitrogen compounds, nitrogen and non-metallic compounds, etc., can solve the serious volatilization of magnesium powder and inorganic salts, reduce the thermal conductivity of silicon magnesium nitride, The reaction cannot be fully carried out and other problems, and the effects of short preparation cycle, improved purity and productivity, and low production cost are achieved.

Active Publication Date: 2019-09-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method prepares magnesium silicon nitride by reducing silicon dioxide by magnesia thermal reduction nitriding method, and the oxygen element contained in silicon dioxide will reduce the thermal conductivity of the prepared magnesium silicon nitride. Since this method is directly prepared by powder , during the reaction process, the magnesium powder and inorganic salts volatilize seriously, and the reaction cannot be fully carried out, so that the purity of the prepared powder is not high

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  • Magnesium silicon nitride powder based on molten-salt growth method, and preparation method of magnesium silicon nitride powder
  • Magnesium silicon nitride powder based on molten-salt growth method, and preparation method of magnesium silicon nitride powder

Examples

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Embodiment 1

[0037] A silicon magnesium nitride powder based on a molten salt method and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0038] Step 1, with 27~28wt% magnesium powder, 47~48wt% silicon nitride powder, 15~16wt% potassium chloride and 10~11wt% sodium chloride as raw material batching, add described raw material 0.02 ~0.03 wt% additives.

[0039]Step 2, using ethanol solution as the medium, ball milling the magnesium powder and the silicon nitride powder for 2 to 3 hours to obtain the mixture I; then drying and grinding the mixture I, and then adding the potassium chloride, The sodium chloride and the additive are ball milled for 0.5-1 hour to obtain the mixture II.

[0040] Step 3: Press the mixture II into a sheet under the condition of 5-7MPa, then raise the temperature to 600-700°C at a rate of 5-8°C / min under a nitrogen atmosphere, and then heat up to 600-700°C at a rate of 3-4°C / min. Raise the temperature ...

Embodiment 2

[0044] A silicon magnesium nitride powder based on a molten salt method and a preparation method thereof. This example is the same as Example 1 except that the additive is cerium oxide.

Embodiment 3

[0046] A silicon magnesium nitride powder based on a molten salt method and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0047] Step 1, with 28~29wt% of magnesium powder, 46~47wt% of silicon nitride powder, 13~14wt% of potassium chloride and 12~13wt% of sodium chloride as raw material batching, add described raw material 0.04 ~0.05 wt% additives.

[0048] Step 2, using ethanol solution as the medium, ball milling the magnesium powder and the silicon nitride powder for 2 to 3 hours to obtain the mixture I; then drying and grinding the mixture I, and then adding the potassium chloride, The sodium chloride and the additive are ball milled for 0.5-1 hour to obtain the mixture II.

[0049] Step 3: Press the mixture II into a sheet under the condition of 5-7MPa, then raise the temperature to 700-800°C at a rate of 6-9°C / min under a nitrogen atmosphere, and then heat up to 700-800°C at a rate of 3.5-4.5°C / min. Raise...

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Abstract

The invention relates to magnesium silicon nitride powder based on a molten-salt growth method, and a preparation method of the magnesium silicon nitride powder. The preparation method is characterized by comprising the following steps: blending 27-30wt% of magnesium powder, 45-48wt% of silicon nitride powder, 13-16wt% of potassium chloride and 10-13wt% of sodium chloride which are used as raw materials, and adding additives into the raw materials, wherein the adding amount of the additives is 0.2-0.05wt% of the total weight of the raw materials; carrying out ball-milling on the magnesium powder and the silicon nitride powder by using an ethanol solution as a medium, drying, grinding, adding the potassium chloride, the sodium chloride and the additives, and carrying out ball-milling again; after that, tabletting, heating up to 600-900 DEG C in a nitrogen atmosphere at a speed of 5-10 DEG C / min, then heating up to 1100-1400 DEG C at a speed of 3-5 DEG C / min, carrying out heat preservation, cooling along with a furnace, crushing, soaking in an acid solution, washing with distilled water, and drying to obtain the magnesium silicon nitride powder based on the molten-salt growth method. The preparation method has the characteristics of being low in synthetic temperature, short in production cycle, low in production cost and suitable for industrial production; the prepared magnesium silicon nitride powder based on the molten-salt growth method is high in heat conductivity and purity.

Description

technical field [0001] The invention belongs to the technical field of magnesium silicon nitride powder. In particular, it relates to a silicon magnesium nitride powder based on a molten salt method and a preparation method thereof. [0002] technical background [0003] Magnesium silicon nitride belongs to the orthorhombic crystal system and is a ternary nitride similar to the crystal structure of aluminum nitride. It has high fracture toughness, high strength, high hardness, high thermal conductivity, high temperature electrical insulation and high temperature oxidation resistance. and other excellent performance. Compared with aluminum nitride materials with high thermal conductivity, the preparation cost of magnesium silicon nitride is lower, and it has been highly valued by researchers at home and abroad. In terms of application, magnesium silicon nitride can be used as a sintering aid for high thermal conductivity non-oxide ceramics and β-Si 3 N 4 It can be used as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082
CPCC01B21/0602
Inventor 丁军曹桂莲王杏邓承继余超祝洪喜
Owner WUHAN UNIV OF SCI & TECH
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