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A kind of preparation method of hydrolysis-resistant aluminum nitride powder

An aluminum nitride and anti-hydrolysis technology, applied in the field of inorganic functional materials, can solve the problems of environmental pollution, poor uniformity, and increase the transportation and storage costs of AlN powder, and achieve the effect of fine and uniform powder particles and high production efficiency

Active Publication Date: 2018-10-12
内蒙古盛和芯材科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of AlN powder is extremely active, which is prone to hydrolysis reaction of water vapor in the air, which seriously affects the performance of AlN ceramics, and at the same time increases the transportation and storage costs of AlN powder.
On the other hand, the easy hydrolysis of AlN powder also hinders the development of AlN ceramic water-based molding process. The traditional non-water-based molding process is expensive, poor in uniformity, and pollutes the environment.

Method used

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  • A kind of preparation method of hydrolysis-resistant aluminum nitride powder
  • A kind of preparation method of hydrolysis-resistant aluminum nitride powder
  • A kind of preparation method of hydrolysis-resistant aluminum nitride powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 10g of AlN powder, impregnate the AlN powder with 69% (mass percentage concentration, the same below) concentrated nitric acid for 0.5h to carry out passivation treatment; 2 o 3 Put it in a beaker, add nitric acid, and magnetically stir to dissolve it completely to obtain a saturated lanthanum nitrate solution; add the impregnated AlN to the saturated lanthanum nitrate solution and stir evenly; Fully stir at 50°C for 2 hours to obtain rare earth sol and evenly coat AlN powder; use a spray dryer with an outlet temperature of 90°C, a feed rate of 500mL / h, and a blast speed of 0.6m 3 / min drying to obtain aluminum nitride powder coated with lanthanum citrate.

[0023] The aluminum nitride powder obtained in this example does not undergo hydrolysis in water at 40° C. for 40 hours.

Embodiment 2

[0025] Weigh 10g AlN powder, impregnate AlN powder with 69% concentrated nitric acid for 3h for passivation treatment; 0.3g La 2 o 3 Place in a beaker, add nitric acid, and magnetically stir to dissolve it completely to obtain a saturated lanthanum nitrate solution; add the impregnated AlN to the saturated lanthanum nitrate solution and stir evenly; then add 0.36g citric acid and 0.14g ethylene glycol, Fully stir in a water bath at 60°C for 1 hour to obtain a rare earth sol and evenly coat the AlN powder; use a spray dryer with an outlet temperature of 90°C, a feed rate of 500mL / h, and a blast speed of 0.6m 3 / min drying to obtain aluminum nitride powder coated with lanthanum citrate.

[0026] The aluminum nitride powder obtained in this example does not undergo hydrolysis in water at 40° C. for 43 hours.

Embodiment 3

[0028] Weigh 10g AlN powder, impregnate AlN powder with 69% concentrated nitric acid for 6h for passivation treatment; 0.6g La 2 o 3 Place in a beaker, add nitric acid, and magnetically stir to dissolve it completely to obtain a saturated lanthanum nitrate solution; add the impregnated AlN to the saturated lanthanum nitrate solution and stir evenly; then add 0.71g citric acid and 0.28g ethylene glycol, Fully stir in a water bath at 80°C for 0.5h to obtain a rare earth sol and evenly coat the AlN powder; use a spray dryer with an outlet temperature of 90°C, a feed rate of 500mL / h, and a blast speed of 0.6m 3 / min drying to obtain aluminum nitride powder coated with lanthanum citrate.

[0029] The aluminum nitride powder obtained in this example does not undergo hydrolysis in water at 40° C. for 48 hours.

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Abstract

The invention provides a preparation method of anti-hydrolytic aluminum nitride powder and belongs to the field of inorganic functional materials. The preparation method comprises the following steps: by taking AlN powder as a raw material, soaking with concentrated nitric acid for 0.5-6 hours; dissolving rare earth oxide La2O3 or Y2O3 or CeO2 in the concentrated nitric acid to prepare saturated rare earth nitrate solution, adding AlN treated by nitric acid into the saturated rare earth nitrate solution, and uniformly stirring; then adding citric acid and ethylene glycol, and carrying out water bath; and carrying out spray drying, so that rare earth citrate coated AlN powder is obtained. The prepared AlN powder has the advantages that interface bonding force between a coating layer and AlN is strong and anti-hydrolytic time is prolonged along with increase of the coating layer. The preparation method provided by the invention is simple in operation and good in repeatability.

Description

technical field [0001] A method for preparing hydrolysis-resistant aluminum nitride powder belongs to the technical field of inorganic functional materials. Background technique [0002] AlN ceramic has the advantages of excellent insulation, thermal conductivity, high temperature resistance, corrosion resistance and matching with the thermal expansion coefficient of silicon, so it has a very wide application prospect in different fields. At present, the main application fields of AlN ceramics are heat dissipation substrates and packaging materials for large-scale integrated circuits, semiconductor module circuits, and high-power devices. [0003] AlN powder is the raw material for preparing AlN ceramics, and its properties have a direct impact on the preparation process and performance of AlN ceramics. However, the surface of AlN powder is extremely active, which is prone to hydrolysis reaction of water vapor in the air, which seriously affects the performance of AlN ceram...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/581C04B35/628
CPCC04B35/581C04B35/62802
Inventor 王群姚晓明李永卿王澈于云飞
Owner 内蒙古盛和芯材科技有限责任公司
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