Nano aluminum nitride powder synthesis production line

Abstract

The invention relates to the field of aluminum nitride synthesis, and discloses a nano aluminum nitride powder synthesis production line which comprises a nano aluminum nitride powder synthesis device, a material collection system, a nitrogen supply system, a refrigeration system and an argon supply system. The nano aluminum nitride powder synthesis device comprises a shell, a spraying unit, a gasification unit, a reaction unit and a cooling unit. The material collection system is connected with an outlet of the cooling unit and used for gas-powder separation, recovery and packaging of materials. The nitrogen supply system is used for supplying nitrogen to the spraying unit, the reaction unit and the cooling unit. The refrigeration system is used for circularly supplying a refrigerant medium to the spraying unit, the gasification unit and the cooling unit. The argon supply system communicates with the spraying unit and the shell and is used for supplying argon. The aluminum nitride issynthesized through the production line, the raw materials react completely, the synthesized aluminum nitride powder is high in purity, the particle size of the powder is uniform and is in a nanoscale, agglomeration is not likely to happen, continuous production can be achieved, the yield is high, the output is high, the number of needed corollary equipment is small, and the cost is low.

Description

technical field [0001] The invention relates to the field of aluminum nitride synthesis, in particular to a nanometer aluminum nitride powder synthesis production line. Background technique [0002] As mankind enters the 21st century, materials, information, and energy are known as the three pillars of science. Materials are the material basis for human production and life, and a symbol of human progress and human civilization. With the emergence and development of new technologies such as space technology, infrared technology, sensor technology, and energy technology, materials must have superior properties such as high temperature resistance, corrosion resistance, and high insulation to be used in harsh environments. Aluminum nitride material stands out from the new materials due to its unique and outstanding characteristics, and is increasingly valued by scientists from all over the world. Aluminum nitride does not exist in nature and is artificially synthesized. It is a...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of this method are: the melting point of aluminum is 660°C, and the nitriding temperature is 1000-1600°C. During nitriding, an aluminum nitride layer will be formed on the surface of aluminum water (liquid), which will prevent N 2 Further penetration into the aluminum water (liquid), the heat released during nitriding causes the product to be in a large block shape with low purity

[0008] The disadvantages of this method are: the synthesis time is long, the temperature is high, and the separation and treatment of excess C and CO after synthesis lead to high cost.

[0010] The disadvantages of this method are: the thermal conversion rate of the plasma torch is lower than 20%, high energy consumption, and large investment in equipment; The mixing of copper and aluminum gas affects the purity; the tungsten-copper electrode needs to be replaced in about 100 hours, and the cost of consumables is high; the torch electrode is water-cooled, and once the copper electrode is ablated and perforated by cooling water sprayed into the crucible at ultra-high temperature, it will cause instantaneous water vapor expansion and explode; Due to the high production cost, industrial production has not yet been formed in China

[0012] The disadvantages of this method are: due to the size and temperature of the aluminum mist particles, some particles are nitrided on the surface, but not in the middle, and the purity is not high.

[0014] (1) The raw materials cannot be completely reacted, or contain impurities and have low purity

[0015] (2) Most of the domestic use direct nitriding method and thermal reduction method, the product is agglomerated and blocky, crushing and grinding is the biggest problem, the cost is high, the thickness is uneven, the abrasive loss enters the powder, and the particles after grinding are difficult to reach the fineness, which affects the quality of deep processing greatly affected

[0016] (3) The current domestic production process cannot achieve high-purity nano-powder

[0017] (4) Intermittent production: feeding→preheating→heating→reaction→heat preservation→cooling→discharging→crushing→separation→grinding→separation→drying→grading→packaging, one furnace after another, low equipment utilization

[0018] (5) Production management is difficult: many equipments, large workshops, many links, many processes, large investment, and many personnel

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