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Method for synthesizing aluminium nitride

A synthesis method, aluminum nitride technology, applied in nitrogen compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as complicated operation steps, pollution, and difficult ignition

Inactive Publication Date: 2006-07-05
TAIYEN BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the above-mentioned background of the invention, it is known that the production of aluminum nitride by combustion synthesis has the following disadvantages: complex operation steps, high operating costs, difficult ignition, easy to be polluted by oxygen and water vapor in the atmosphere, and the quality of aluminum nitride is different from that of aluminum nitride. Yield difference

Method used

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  • Method for synthesizing aluminium nitride
  • Method for synthesizing aluminium nitride
  • Method for synthesizing aluminium nitride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A homogeneous mixture of aluminum powder to aluminum nitride with a weight ratio of 4:1 was filled into a small graphite hollow shell to form a reactant inclusion body, wherein the total weight of the mixture was 1.060 kg; the bulk density was 0.34 g / cm3. Pure aluminum powder and 4% by weight of sodium azide (NaN 3 ) uniformly mixed as an igniter, and then spread this igniter with a thickness of 3 mm and a diameter of about 50 mm on the central position of the top of the reactant inclusion body. When the reactant inclusion body is prepared, the reactant inclusion body is placed into the reaction chamber. Then, use a vacuum pumping system to evacuate the reaction chamber to a vacuum, then inject 0.5 atmospheric pressure of nitrogen into the reaction chamber, and start to recirculate the cooling liquid (water) between the inner wall and the outer wall of the reaction chamber, wherein the cooling liquid The temperature is maintained at about room temperature. Then, the t...

Embodiment 2～4

[0042] Embodiment 2~4: in embodiment 1, fill in the pure aluminum powder of different proportions: sodium azide

[0043] Embodiments 2-4 are similar to Embodiment 1 except that the ratio of pure aluminum powder to sodium azide is different for the igniter. Table 1 shows the results of Examples 2-4.

[0044] Reality

Embodiment 5

[0046] A homogeneous mixture of aluminum powder and aluminum nitride with a weight ratio of aluminum powder to aluminum nitride of 4:1 is filled into a large graphite hollow shell to form a reactant inclusion body, wherein the total weight of the mixture is 30.3 kg; bulk density It is 0.341 g / cubic centimeter. The igniter as described in Example 1 was spread at the center of the top of the reactant inclusion body with a thickness of 3 mm and a diameter of about 100 mm. When the reactant inclusion body is ready, use the vacuum pumping system to evacuate the reaction chamber to a vacuum, and inject 0.5 atmospheric pressure of nitrogen into the reaction chamber to vacuum, and then start to recirculate the cooling liquid (water) on the inner and outer walls of the reaction chamber between, which keeps the temperature of the coolant at about room temperature. Then pass through the tungsten wire (ignition device) with a current of 30-40 amperes; a voltage of 50-60 volts for about 5...

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Abstract

This invention involves a method to synthesize aluminum nitride. The aluminum nitride is synthesized by placing kindling agent which is composed of sodium azide powder such as NaN3 and aluminum powder into burning areas which contain aluminum powder and diluent with several different ratios. The content of the diluent is increasingly increased along the direction of the burning wave during the synthesis process. In the process of synthesizing aluminum nitride, the kindling agent in burning area is ignited at less than 1 atm circumstance. After ignition, nitrogen is guided into the reactor as the source of nitrogen during the synthesis process.

Description

technical field [0001] The invention relates to a synthesis method of aluminum nitride, in particular to a combustion synthesis method of aluminum nitride ignited in an environment less than 1 atmospheric pressure (atm). Background technique [0002] In recent years, due to the unique physical properties of aluminum nitride, such as: high thermal conductivity close to metal and ten times that of aluminum oxide; low thermal expansion coefficient and high electrical insulation comparable to silicon and silicon carbide; excellent resistance Thermal shock resistance; mechanical strength comparable to alumina ceramic materials; excellent corrosion resistance, so aluminum nitride has become a very important application material in industry. Aluminum nitride has been widely used in many commercial applications, such as: substrates for electronic components, packaging materials for integrated circuits, heat dissipation materials, and containers for containing or handling molten meta...

Claims

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Application Information

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IPC IPC(8): C01B21/072
Inventor 赖振兴翁子斌
Owner TAIYEN BIOTECH
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