Method for preparing low-oxygen aluminum nitride powder by auto-igniting synthesis

A low oxygen content, self-propagating combustion technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of incapable of large-scale production process, high oxygen content and complexity of powder, and achieve rapid synthesis reaction time , high purity and narrow particle size distribution

Inactive Publication Date: 2009-06-03
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose a method for preparing aluminum nitride powder with low oxygen content by a self-propagating synthesis method, which overcomes the high oxygen content of the powder synthesized by the prior art and cannot be used on a large sca

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  • Method for preparing low-oxygen aluminum nitride powder by auto-igniting synthesis
  • Method for preparing low-oxygen aluminum nitride powder by auto-igniting synthesis
  • Method for preparing low-oxygen aluminum nitride powder by auto-igniting synthesis

Examples

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Example Embodiment

[0032] In Example 1, a metal aluminum powder with a particle size of 300 mesh (purity of metal aluminum powder> 99.5%, iron content 98.8%) 50%, NH4 After mixing Cl5wt%, put it into the pot mill. The pot mill is lined with polyurethane and Al 2 O 3 The ball is the ball milling medium, the weight ratio of material: ball is 1:4, and the ball is milled for 2 hours. The powder after ball milling is passed through a 40-mesh screen. The sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then leveled. Put it into the spontaneous combustion synthesis reactor, after evacuating, fill with high-purity nitrogen to 2MPa, and then exhaust. This process is repeated 3 times, then fill with high-purity nitrogen until the pressure is maintained at 3MPa, and use a tungsten wire with a diameter of 0.6mm. The heating element is fed with a current of 25 amperes. The ignition time lasts for 15 seconds. The ignition induces the spontaneous combustion reaction of the raw mater...

Example Embodiment

[0033] In Example 2, metal aluminum powder with a particle size of 200 mesh (purity of metal aluminum powder> 99.5%, iron content 4 Cl 15wt%, sodium azide 5wt% are mixed and put into the three-dimensional motion mixer. The mixer is lined with polyurethane and Al 2 O 3 The ball is a ball milling medium, the weight ratio of material: ball is 1:8, and the ball is milled for 5 hours. The powder after ball milling is passed through a 40-mesh screen. The sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then leveled. Put it into the spontaneous combustion synthesis reactor, after vacuuming, fill with high-purity nitrogen to 2MPa, and then exhaust. This process is repeated 3 times, then fill with high-purity nitrogen until the pressure is kept at 4.5MPa, and use nickel-chromium with a diameter of 0.6mm The wire is used as a heating element, and an electric current of 25 amperes is passed through. The ignition induces the spontaneous combustion reaction of t...

Example Embodiment

[0034] In Example 3, metal aluminum powder with a particle size of 100 mesh (purity of metal aluminum powder> 99.5%, iron content 4 Cl 15wt% and sodium azide 5wt% are mixed and put into the three-dimensional motion mixer. The mixer is lined with polyurethane and Al 2 O 3 The ball is a ball milling medium, the weight ratio of material: ball is 1:6, and the ball is milled for 3 hours. The powder after ball milling is passed through a 40-mesh screen. The sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then leveled. Put it into the spontaneous combustion synthesis reactor, after evacuating, fill with high-purity nitrogen to 2MPa, and then exhaust. This process is repeated 3 times, then fill with high-purity nitrogen until the pressure is maintained at 6MPa, and use a nickel-chromium wire with a diameter of 0.6mm As a heating element, a 25 ampere current is applied to ignite the raw material powder to initiate a spontaneous combustion reaction. During t...

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Abstract

The invention discloses a method for preparing low-oxygen aluminum nitride powder by auto-igniting synthesis, which is characterized in that the method comprises the processing steps of treating raw materials, compounding, mixing, reacting and finishing. The synthesized aluminum nitride has high nitrogen content, low oxygen content and fine granularity; and is suitable for producing high-heat conductive aluminum nitride ceramic base plates, ceramic insulating radiation fins and aluminum nitride-based structural ceramics. Owing to much higher heat conductivity of aluminum nitride than common ceramic materials, the aluminum nitride powder is also generality used as a raw material for producing ceramics. The aluminum nitride powder obtained by auto-igniting synthesis has the advantages of high purity, fine granularity, narrow particle size distribution, high sintering activity, and the like. Furthermore, the invention and is especially suitable for sintering high-heat conductive aluminum nitride ceramics.

Description

technology field; [0001] The invention belongs to the field of inorganic non-metallic materials, and specifically relates to a method for preparing aluminum nitride powder with low oxygen content by adopting a self-propagating combustion synthesis method. The prepared aluminum nitride can be widely used in the fields of structural ceramics, electronic packaging materials, and the like. Background technique: [0002] Aluminum nitride is a new type of advanced ceramic material with excellent comprehensive performance, and has excellent and high thermal conductivity (theoretical thermal conductivity is 319W m -1 ·K -1 ), reliable electrical insulation, low dielectric constant and dielectric loss, non-toxic, and a linear expansion coefficient that matches silicon (293~773K, 4.8×10 -6 ) and other excellent properties, it is considered to be an ideal material for a new generation of highly integrated semiconductor substrates and electronic device packaging, and has received exten...

Claims

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Application Information

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IPC IPC(8): C01B21/072C04B35/581
Inventor 燕东明李金富李康李国斌刘国玺常永威赵斌段关文王拥军乔光利
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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