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Aluminum nitride powder and preparation method thereof

A technology of aluminum nitride and powder, which is applied in the field of aluminum nitride powder and its preparation, can solve the problems of uneven size distribution, high equipment requirements, complex process, etc., and achieve uniform size distribution, low equipment requirements, and simple process Effect

Inactive Publication Date: 2018-04-13
SUZHOU TUNABLE MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis methods of aluminum nitride powder mainly include: aluminum powder direct nitriding method, Al 2 o 3 Carbothermal reduction method, aerosol (gas phase reaction) method, electric arc method, plasma chemical synthesis method, etc., but the existing preparation methods often have long reaction time, complicated process and high requirements for equipment, which are not conducive to industrial production. The aluminum nitride powder has large particle size, uneven size distribution, low aluminum nitride content and low sintering activity

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  • Aluminum nitride powder and preparation method thereof
  • Aluminum nitride powder and preparation method thereof
  • Aluminum nitride powder and preparation method thereof

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preparation example Construction

[0029] See figure 1 , the preparation method of aluminum nitride powder shown in the present invention comprises the following steps:

[0030] S1. Provide alumina precursors and carbon and nitrogen compounds, wherein the alumina precursors undergo a coordination reaction between aluminum alkoxide and a chelating agent at 50 to 95°C under reflux conditions, followed by hydrolysis and polycondensation at 60 to 100°C reaction, and finally remove the solvent, wherein the chelating agent is preferably acetylacetone, and the solvent is selected from the group consisting of toluene, xylene, ethanol, n-propanol, isopropanol, ethylene glycol methyl ether or ethylene glycol ether any of

[0031] S2. Blend the alumina precursor and carbon and nitrogen compounds to form a uniform mixed solution, and then remove the solvent in the mixed solution by vacuum drying, spray drying or direct drying at 30°C to 150°C, A viscous solution or colloidal solid is obtained, and then the obtained visco...

Embodiment 1

[0037] ① Precursor cured product preparation:

[0038] (1) The aluminum oxide precursor and the phenolic resin are blended into an ethanol solution with a solid content of 15% according to the ratio of aluminum element to carbon element mass ratio of 1:0.7;

[0039] (2) The solvent in the above solution is removed by vacuum drying at 70° C. to obtain a colloidal solid;

[0040] (3) The obtained solid is cured and debinding in a debinding furnace at 600° C., and the selected atmosphere is nitrogen to obtain a cured precursor.

[0041] ② Preparation of aluminum nitride powder

[0042] After grinding the cured precursor obtained above through an 80-mesh sieve, carry out high-temperature sintering treatment at 1600°C, a nitrogen atmosphere of 700mL / min, and a heating rate of 10°C / min, and keep it warm for 4 hours to obtain aluminum nitride. Ultrafine powder.

[0043] ③Purification of aluminum nitride powder

[0044] Purify and sinter the above-mentioned aluminum nitride ultraf...

Embodiment 2

[0047] ① Precursor cured product preparation:

[0048] (1) The aluminum oxide precursor and the allyl phenolic resin are blended into a 15% n-propanol solution with a solid content of 15% according to the ratio of aluminum element and carbon element mass ratio of 1:5;

[0049] (2) The solvent in the above solution is removed by vacuum drying at 50° C. to obtain a viscous solution;

[0050] (3) The obtained viscous liquid is cured and deglued in a debinding furnace at 250°C, the heating rate is 10°C / min, and maintained at 250°C for 4 hours, the selected atmosphere is air, and a cured precursor is obtained .

[0051] ② Preparation of aluminum nitride powder

[0052] Grind the cured precursor obtained above through a 40-mesh sieve, then carry out high-temperature sintering treatment at 1700°C, 2L / min nitrogen atmosphere, and a heating rate of 15°C / min, and keep it warm for 4 hours to obtain super aluminum nitride. fine powder.

[0053] ③Purification of aluminum nitride powder...

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Abstract

The invention relates to aluminum nitride powder and a preparation method thereof. The preparation method comprises the following steps: S1, providing an aluminum oxide precursor and a carbon-nitrogencompound; S2, mixing the aluminum oxide precursor and the carbon-nitrogen compound to prepare a uniform mixed solution, curing and discharging glue under 150-1000 DEG C to obtain a precursor cured material; S3, sintering the precursor cured material at high temperature of 1500-2000 DEG C to obtain the aluminum nitride powder; and S4, purifying and sintering the obtained aluminum nitride powder for 1-72 hours under 450-800 DEG C to obtain high-purity aluminum nitride powder. The preparation method is used for mixing the aluminum oxide precursor with the carbon-nitrogen compound, then curing and discharging glue under certain temperature, then carrying out carbon-nitrogen reduction reaction and purification reaction under high temperature to prepare high-purity superfine aluminum nitride powder. The preparation method is simple in process high in efficiency and low in requirement on equipment; the prepared aluminum nitride powder can be prepared into submicron-sized ellipsoidal particles and is uniform in size distribution and high in dispersity; meanwhile, the content of aluminum nitride in the aluminum nitride powder is greater than 96%; the requirements of industrialization can be met.

Description

technical field [0001] The invention relates to an aluminum nitride powder and a preparation method thereof, belonging to the technical field of powder preparation. Background technique [0002] Aluminum nitride (AlN) is an inorganic non-metallic material like diamond nitride. It has good thermal conductivity and small thermal expansion coefficient. It is a good thermal shock resistant material. It has a strong ability to resist molten metal erosion. Alloy is an ideal crucible material. Aluminum nitride is also an electrical insulator with good dielectric properties and has a good application prospect in the field of electrical component manufacturing. Ultrafine aluminum nitride powder is widely used in the field of large-scale integrated circuit production. Aluminum nitride powder is the raw material for preparing aluminum nitride ceramics. Its purity, particle size, oxygen content and other impurity content have an important impact on the thermal conductivity of the prep...

Claims

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Application Information

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IPC IPC(8): C04B35/581C04B35/626
CPCC04B35/581C04B35/626C04B2235/95
Inventor 李远超杨自海潘迅
Owner SUZHOU TUNABLE MATERIALS TECH CO LTD
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