Method for preparing aluminium nitride powder by carbothermic reduction method

A reduction method, aluminum nitride technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of high reaction temperature and long reaction time

Active Publication Date: 2005-06-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, in the process of preparing aluminum nitride powder by carbothermal reduction, there are still many shortcomings, such as high reaction temperature, long reaction time, etc.

Method used

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  • Method for preparing aluminium nitride powder by carbothermic reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using industrial aluminum hydroxide as raw material, firstly mix 1000g of aluminum hydroxide with 15g of boric acid additive, calcined at 500°C for 6 hours, take 200g of calcined alumina, put it into a 1000ml beaker, add 200ml of deionized water , then add 25g of aluminum nitrate, then add the surfactant solution, adjust the pH value between 2 and 3 with nitric acid, add 70g of superfine carbon powder while stirring, after adding the carbon powder, stir for 20 minutes, slowly add ammonia water, Adjust the pH value to between 12. At this time, the slurry becomes a whole gel-like substance. The gel is dried in a drying oven at 90° C., and the dried gel is broken into small particles of 2 to 8 mm. Put the small particles into the vacuum carbon tube furnace, control the flow of nitrogen gas at 20-25ml / s, the sintering temperature is 1600°C, and the time is 3 hours. The calcined material is pulverized, oxidized and decarburized in a muffle furnace at 750°C, and finally gray ...

Embodiment 2

[0022] The aluminum oxide in example 1 is replaced by superfine aluminum hydroxide, and the calcining temperature is 1550° C., and the same result is also obtained.

Embodiment 3

[0024] Using industrial aluminum hydroxide as raw material, firstly mix 1000g of aluminum hydroxide with 15g of boric acid additive, calcined at 900°C for 2 hours, take 200g of calcined alumina, put it into a 1000ml beaker, add 200ml of deionized water , then add 25g of aluminum nitrate, then add surfactant solution, adjust the pH value between 2 with nitric acid, add 70g of superfine carbon powder while stirring, after adding the carbon powder, stir for 30 minutes, slowly add ammonia water, adjust the pH When the value is between 13, the slurry becomes a whole gel-like substance, and the gel is dried in a drying oven at 90°C, and the dried gel is broken into small particles of 2-8mm, and the small particles Put it into a vacuum carbon tube furnace, control the nitrogen flow rate at 20-25ml / s, the sintering temperature at 1800°C, and the sintering time for 2 hours. The calcined material is pulverized, oxidized and calcined in a muffle furnace at 800°C for 2 hours for decarburi...

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Abstract

The invention is an aluminum nitride powder preparation by a kind of carbon thermal recovery and relates to techniques of aluminum nitride powder preparation by carbon thermal recovery. If features that burning the mixture of aluminum hydroxide and fluoride or boride at the temperature between 500 to 900 deg C for 2 or 4 hours in the preparation to obtain a multiaperture active aluminum oxide, crush up the obtained aluminum oxide to powder and prepare in the water into suspending liquid, add aluminate, carbon powder to gelate, then dry and crush up into powder, finally inlet nitrogen to obtain the nitride powder. This so prepared aluminum nitride is of tiny particles, no hard conglobation meanwhile the reaction temperature is compared low.

Description

technical field [0001] A method for preparing aluminum nitride powder by carbothermal reduction relates to a method for preparing aluminum nitride powder by carbothermal reduction. Background technique [0002] AlN (aluminum nitride) is a group III-V semiconductor compound, and its crystal is a covalent bond compound with a [AlN4] tetrahedron as the structural unit and a Warzjte structure. Lattice constant α at 25°C 0 = 3.1127, c 0 =4.9816, belongs to the hexagonal crystal system, the true density of the powder is 3.255g / cm 3 . [0003] AlN material has high thermal conductivity (yes Al 2 o 3 8 to 10 times that of silicon), good high temperature electrical insulation, good dielectric properties, low thermal expansion coefficient (4.4×10-6°C), similar to single crystal silicon, and better than Al 2 o 3 , BeO are low, high thermal shock resistance, high material strength at high temperature, high hardness, non-toxic and other excellent characteristics, so it has been wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/072C01F7/00
Inventor 陈玮马艳红王庆伟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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