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Method for preparing high-purity aluminum nitride spherical powder through plasma reaction atomization

A plasma and spherical powder technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of poor spheroidization rate, average purity of aluminum nitride powder, and no refined production steps, etc. The effect of purity

Pending Publication Date: 2020-07-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The plasma reaction atomization method was first proposed by Paul D. Prichard of the United States (Patent No. US005939151A), but it only proposed a conceptual theory and a simple structure without refining the production steps, and only a beam of plasma impacted the melt instead of producing Multiple plasma beams perform 360-degree surround and uniform impact atomization on the molten liquid, and the final aluminum nitride powder produced has a general purity (less than 75% in the best case), and the spheroidization rate is not good

Method used

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  • Method for preparing high-purity aluminum nitride spherical powder through plasma reaction atomization
  • Method for preparing high-purity aluminum nitride spherical powder through plasma reaction atomization
  • Method for preparing high-purity aluminum nitride spherical powder through plasma reaction atomization

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Embodiment 1

[0045] This embodiment is a specific structure of a device for preparing high-purity aluminum nitride spherical powder by plasma reaction atomization. figure 1 As shown, the molten aluminum 1 enters the reaction atomization chamber 13 through the aluminum liquid transportation channel 11; the nitrogen gas source 12 delivers nitrogen gas to the plasma torch 4 through the transportation pipeline 2, and the plasma torch 4 is connected to the reaction atomization chamber 13 through the flange 3 , the generated nitrogen plasma achieves supersonic speed in the flow channel of the reaction atomization nozzle 14, and is ejected at the annular seam outlet 6, forming a 360-degree annular supersonic nitrogen plasma beam 5; The atomization chamber 13 is impacted and atomized into aluminum droplets 6, and at the same time, the aluminum droplets 7 react with the nitrogen plasma to form aluminum nitride 15; the aluminum nitride 15 leaves the reaction atomization chamber 13 and falls into the ...

Embodiment 2

[0047] This embodiment is a specific structure of the reactive atomizing nozzle 14 in Embodiment 1. Depend on figure 2 As shown in the non-transparent sectional view (left) and transparent sectional view (right) of the nozzle, nitrogen plasma enters the supersonic flow channel 20 through the inlet 19, the supersonic flow channel 20 is a compression-expansion structure, and the nitrogen plasma is in The supersonic flow channel 20 accelerates to supersonic speed and disperses into a 360-degree full-coverage plasma beam, which is finally sprayed from the annular slot outlet 6 into the central hole of the reaction atomization nozzle to form an atomization focus.

Embodiment 3

[0049] This embodiment is another specific structural schematic diagram of the reactive atomizing nozzle in embodiment 1, and its structure is similar to that of embodiment 2, the difference is that:

[0050] The structure is a multi-outlet reactive atomizing nozzle. The impact atomization effect of the multi-outlet reactive atomizing nozzle is worse than that of the annular slot outlet type, but the flow field is more stable than that of the annular slot type nozzle. Such as Figure 3-a , as shown in 3-b and 3-c, the specific structure has 4 entrances and 8 exits, of which Figure 3-a It is the axonometric view and perspective view of the structural appearance of the reaction atomizing nozzle, Figure 3-b It is a top view and a perspective view of the structure of the reaction atomizing nozzle, Figure 3-c It is a front view and a perspective view of the reaction atomizing nozzle structure. The reaction atomization nozzle structure is fixed to the reaction atomization cham...

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Abstract

The invention relates to a method for preparing high-purity aluminum nitride spherical powder through plasma reaction atomization. The method comprises a step of generating nitrogen plasma, namely a step of generating the nitrogen plasma by a plasma torch and jetting the plasma into a reaction atomization device; a step of reaction atomization, namely a step of performing reaction atomization on molten aluminum liquid by the nitrogen plasma in the reaction atomization device and simultaneously reacting the molten aluminum liquid with nitrogen to generate aluminum nitride, with the reaction atomization device comprising a heat source, a reaction atomization nozzle and a reaction atomization chamber, the heat source being used for obtaining the molten aluminum liquid, and the reaction atomization nozzle being used for spraying 360-degree annular plasma beams; a step of powder collection, namely a step of gradually solidifying the aluminum nitride into spherical powder from leaving the reaction atomizing chamber, and finally collecting the spherical powder by a powder collection device. The method is characterized in that the nitrogen plasma is used for carrying out 360-degree surrounding uniform impact on the molten aluminum through the reaction atomizing nozzle, so that the generation and atomization of the aluminum nitride are synchronously carried out, and the high-purity aluminum nitride spherical powder is obtained while the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of producing spherical ceramic powders. More specifically, the present invention relates to a method and equipment for preparing aluminum nitride spherical powder by means of a plasma reactive atomization process. Background technique [0002] Aluminum nitride (AlN) is a new type of synthetic ceramic material. Its advantages include but are not limited to high hardness, good fire resistance, and stable chemical properties at high temperatures. The preparation of aluminum nitride products requires the use of aluminum nitride powder. High-quality aluminum nitride powder can produce aluminum nitride products with good density and smooth surface, which can better meet the current demand for aluminum nitride products with complex shapes and high dimensional accuracy, so high-quality aluminum nitride powder Preparation technology is a research hotspot in recent years. High-quality aluminum nitride powder that is conducive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/072
CPCC01B21/0724C01P2006/80C01P2004/32
Inventor 不公告发明人
Owner SICHUAN UNIV
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