Microwave preparation method of high-quality aluminum nitride powder

A high-quality technology of aluminum nitride, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as difficult production and application, incomplete reaction, complex equipment, etc., achieve short holding time, high production efficiency, The effect of high energy consumption

Inactive Publication Date: 2013-11-13
HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main disadvantages are low efficiency, complex equipment, incomplete reaction, and difficulty in production and application.

Method used

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  • Microwave preparation method of high-quality aluminum nitride powder
  • Microwave preparation method of high-quality aluminum nitride powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using γ-Al with a particle size of 4.4 μm 2 o 3 Powder and metallurgical-grade high-purity carbon black with a particle size of 1 μm are used as raw materials, and the metallurgical-grade high-purity carbon black and γ-Al are weighed according to the C / Al molar ratio of 3.57:1 2 o 3 Powder, then add calcium carbonate according to the Al / Ca molar ratio of 100:3, mix and ball mill with water for 8 hours, dry and sieve to obtain the raw material to be synthesized. The prepared raw materials were placed in the microwave synthesis reaction chamber of an intermittent industrial microwave oven for microwave synthesis, and high-purity nitrogen gas was introduced, the pressure was normal pressure, the heating rate was 10°C / min, the synthesis temperature was 1420°C, and the temperature was kept for 2 hours. The obtained synthesis The product is heat-treated at 650°C in the air and kept for 10 hours, and the product obtained after cooling is the finished aluminum nitride powder....

Embodiment 2

[0032] Dissolve analytically pure glucose in an aqueous solution of analytically pure aluminum nitrate and calcium carbonate at a C / Al molar ratio of 4.2:1, and the Al / Ca molar ratio of aluminum nitrate and calcium carbonate is 100:5. Then the prepared solution was stirred while heating at 200°C, and finally a fluffy powder was obtained as the precursor of the reaction. The obtained precursor was placed in the microwave synthesis reaction chamber of a continuous industrial microwave oven for microwave synthesis, high-purity nitrogen gas was introduced, the pressure was normal pressure, the heating rate was 8°C / min, the synthesis temperature was 1350°C, and the temperature was kept for 5 hours. The obtained composite is heat-treated at 680°C in the air and kept for 2 hours, and the obtained product is finished aluminum nitride powder after cooling. Finished product color is off-white. After determination, the finished product of aluminum nitride powder contains 33.0% nitrogen,...

Embodiment 3

[0034]Use analytically pure aluminum nitrate and metallurgical-grade high-purity carbon black with a particle size of 0.5 μm as raw materials, weigh metallurgical-grade high-purity carbon black and aluminum nitrate respectively according to the molar ratio of C / Al of 4.44:1, and then weigh them according to the molar ratio of Al / Ca Add calcium carbonate at a ratio of 100:2, mix and ball mill with water for 5 hours, and obtain a uniformly mixed reaction precursor after drying. The prepared precursor was placed in the microwave synthesis reaction chamber of an intermittent industrial microwave oven for microwave synthesis, and N 2 +5%H 2 The mixed gas, the pressure is normal pressure, the heating rate is 15 ° C / min, the synthesis temperature is 1500 ° C, and the temperature is kept for 0.5 hours. powder. Finished product color is off-white. After measurement, the finished aluminum nitride powder contains 33.2% nitrogen, 1.0% oxygen, 0.2% carbon, and a particle size of 0.7 μ...

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Abstract

The invention discloses a microwave preparation method of high-quality aluminum nitride powder. The microwave preparation method comprises the following steps of: mixing an aluminum source with a carbon source in a C/AL molar ratio of (3-6):1; adding calcium carbonate with an Al/Ca molar ratio of 100:(1-5) for uniformly mixing; carrying out microwave synthesis in a microwave reaction device under a nitrogen-containing atmosphere, wherein the heating rate for the microwave synthesis is 3 DEG C/min-20 DEG C/min, the temperature is 1200 DEG C-1600 DEG C, and the thermal insulation time is 0-10 hours; and cooling the obtained product to obtain the high-quality finished product aluminum nitride powder. Different from a conventional heating way by convection, conduction or radiation, the microwave preparation method is used for generating heat by coupling a special wave band of the microwave with a base structure of the material, and used for heating in an integral material heating way by virtue of medium loss of the material; moreover, the microwave preparation method of the high-quality aluminum nitride powder has the advantages of good synthesis quality, low synthesis temperature, short synthesis time, low synthesis energy consumption and the like.

Description

technical field [0001] The invention relates to a preparation method of inorganic non-metal material aluminum nitride powder, in particular to a microwave preparation method of high-quality aluminum nitride powder. Background technique [0002] The sintered body of aluminum nitride is a new type of ceramic material. It has a series of excellent properties such as high thermal conductivity, low thermal expansion coefficient, low dielectric constant and dielectric loss, non-toxic, and insulation. It is not only considered It is an ideal material for a new generation of semiconductor substrates and semiconductor packaging, and its application in the electronics industry has been increasingly valued, and it can also be used in components used in high temperature and corrosive environments. Aluminum nitride ceramics have become one of the research hotspots in the field of modern new materials. [0003] However, high-quality aluminum nitride powder is a key factor in determining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/072
Inventor 曾小锋徐助要李勇全
Owner HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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