A kind of preparation method of aluminum nitride powder

A technology of aluminum nitride and powder, which is applied in the field of preparation of inorganic non-metallic powder, can solve problems such as poor quality of aluminum nitride powder, and achieve the advantages of shortening nitriding time, reducing energy consumption, and uniform particle size distribution Effect

Active Publication Date: 2022-08-09
福建臻璟新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the quality of the aluminum nitride powder prepared by this invention is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of aluminum nitride powder, comprising the following steps:

[0029] In step S10, aluminum nitrate, calcium nitrate, acetylene black, and polyethylene glycol are mixed, and the addition amount of acetylene black and aluminum nitrate is C / Al. 2 O 3 The molar ratio is 2.9:1, and the added weight ratio of aluminum nitrate and calcium nitrate is 100:1.7, and they are dissolved in deionized water, stirred and mixed evenly, heated to 70 ° C, added urea, and added dropwise while stirring to a concentration of The 8.5wt% ammonia solution was heated to 98°C, kept for 30 minutes, then placed in a heating furnace at 1250°C, and kept for 1.5 hours in a nitrogen atmosphere to obtain a precursor;

[0030] In step S20, the precursor obtained in step S10 is mechanically mixed, and the mechanical mixing is to use alumina balls as the ball-milling medium, the weight ratio of the ball-milling material to the ball-milling medium is 1:5.5, and the ball-milling is 4.5 h...

Embodiment 2

[0035] A preparation method of aluminum nitride powder, comprising the following steps:

[0036] In step S10, aluminum nitrate, calcium nitrate, acetylene black, and polyethylene glycol are mixed, and the addition amount of acetylene black and aluminum nitrate is C / Al. 2 O 3 The molar ratio is 2.6:1, the added weight ratio of aluminum nitrate and calcium nitrate is 100:0.8, and they are dissolved in deionized water, stirred and mixed evenly, heated to 65 ° C, added urea, and added dropwise while stirring to a concentration of A 5wt% ammonia solution was heated to 95°C, kept for 20 minutes, and then placed in a heating furnace at 1250°C for 1 hour under a nitrogen atmosphere to obtain a precursor;

[0037] In step S20, the precursor obtained in step S10 is mechanically mixed, and the mechanical mixing is to use alumina balls as the ball-milling medium, the weight ratio of the ball-milling material to the ball-milling medium is 1:5, and the ball-milling is performed for 3 hours...

Embodiment 3

[0042] A preparation method of aluminum nitride powder, comprising the following steps:

[0043]In step S10, aluminum nitrate, calcium nitrate, acetylene black and polyethylene glycol are mixed, and the addition amount of acetylene black and aluminum nitrate is C / Al. 2 O 3 The molar ratio is 3.2:1, the added weight ratio of aluminum nitrate and calcium nitrate is 100:2.6, and they are dissolved in deionized water, stirred and mixed evenly, heated to 75 ° C, added urea, and added dropwise while stirring. The concentration is A 12wt% ammonia solution was heated to 100°C, kept for 40 minutes, then placed in a heating furnace at 1250°C, and kept for 2 hours in a nitrogen atmosphere to obtain a precursor;

[0044] In step S20, the precursor obtained in step S10 is mechanically mixed, and the mechanical mixing is to use alumina balls as the ball-milling medium, the weight ratio of the ball-milling material to the ball-milling medium is 1:6, and the ball-milling is performed for 6 h...

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PUM

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Abstract

The invention discloses a preparation method of aluminum nitride powder, comprising the following steps: mixing aluminum nitrate, calcium nitrate, acetylene black and polyethylene glycol, dissolving in deionized water, stirring and mixing evenly, and heating to 65 ℃ ~75℃, add urea, add ammonia solution dropwise, heat up and keep for 20~40 minutes, then put it in a heating furnace at 1250℃, keep the temperature under nitrogen atmosphere for 1~2 hours to obtain a precursor; mechanically mix the precursor; The mechanically mixed precursor is placed in a microwave high-temperature sintering furnace, and subjected to nitridation to obtain carbon-containing aluminum nitride; the carbon-containing aluminum nitride is placed in a decarburization furnace for decarburization to obtain aluminum nitride powder. The aluminum nitride powder prepared by the invention has the characteristics of uniform particle size distribution, fine particle size, high purity and low impurity oxygen content, and the preparation method is simple, the preparation process is easy to operate, and is suitable for large-scale production and processing.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic non-metallic powders, in particular to a preparation method of aluminum nitride powders. Background technique [0002] Aluminum nitride powder has good thermal, electrical and mechanical properties, high thermal conductivity, low thermal expansion coefficient and matching with silicon, good insulating properties and dielectric properties, strong high temperature materials, in power electronics, aerospace, Defense military, automobile and locomotive, communication and other industrial fields all have broad application prospects. [0003] At present, the methods for preparing aluminum nitride powder mainly include direct nitridation of aluminum powder, alumina carbothermal reduction method, chemical vapor deposition method, high temperature self-propagating synthesis method and plasma chemical synthesis method. The direct nitridation method of aluminum powder is a simple and straig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/072
CPCC01B21/0726C01B21/0728C01P2006/80Y02P20/10
Inventor 林伟毅刘卫平钟建智
Owner 福建臻璟新材料科技有限公司
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