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Preparation method of rare earth surface modified aluminum nitride powder

A surface modification and aluminum nitride technology, which is applied in the field of aluminum nitride powder modification, can solve the problems affecting the performance of composite materials, the non-wetting of modified AlN powder and metal, etc., to improve the structure and performance, improve the resistance Hydrolysis performance, improve uniform effect

Active Publication Date: 2014-12-03
HEILONGJIANG HEIKE TECH CO LTD +1
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Problems solved by technology

[0005] The present invention aims to solve the technical problem that the introduction of impurity elements in the existing modified AlN powder affects the performance of the composite material with AlN as the reinforcing phase, and the technical problem that the modified AlN powder and the metal are not wetted, and proposes a Preparation method of rare earth surface modified aluminum nitride powder

Method used

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  • Preparation method of rare earth surface modified aluminum nitride powder
  • Preparation method of rare earth surface modified aluminum nitride powder
  • Preparation method of rare earth surface modified aluminum nitride powder

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specific Embodiment approach 1

[0022] Embodiment 1: A rare earth surface-modified aluminum nitride powder in this embodiment is an aluminum nitride powder coated with a rare earth oxide, wherein the rare earth oxide is one of yttrium oxide, lanthanum oxide, cerium oxide, and neodymium oxide. species or a combination of several of them.

specific Embodiment approach 2

[0023] Embodiment 2: This embodiment is different from Embodiment 1 in that the thickness of the rare earth oxide coating layer is 2-10 nm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0024] Specific embodiment three: The preparation method of the rare earth surface modified aluminum nitride powder described in specific embodiment one is carried out according to the following steps:

[0025] 1. Preparation of rare earth nitrate solution: use absolute ethanol as solvent, and prepare rare earth nitrate solution according to the concentration of rare earth nitrate at 0.1-2mol / L; wherein the rare earth nitrate is yttrium nitrate, lanthanum nitrate, cerium nitrate and nitric acid One or a combination of neodymium;

[0026] 2. According to the ratio of the mass of the AlN powder to the volume of the rare earth nitrate solution of 1g: (10-50) ml, and the molar ratio of the rare earth nitrate and ammonia water as 1: (1-5), weigh the AlN powder Rare earth nitrate solution and concentrated ammonia water prepared in step 1. Keep the rare earth nitrate solution at a constant temperature of 20-25°C, then add AlN powder, and then add concentrated ammonia water dropwise w...

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Abstract

The invention discloses rare earth surface modified aluminum nitride powder and preparation method thereof, and relates to a modifying method of aluminum nitride powder. The rare earth surface modified aluminum nitride powder disclosed by the invention aims at solving the technical problems that the performance of a composite material using AlN as a reinforcement phase is influenced since impurity elements are introduced into the existing modified AlN powder and the modified AlN power and the metal are non-wetting. The rare earth surface modified aluminum nitride powder is aluminum nitride powder coated by rare earth oxide. The preparation method comprises the following steps: step one, preparing a rare earth nitrate solution; step two, adding the AlN powder in the rare earth nitrate solution, dropwise adding strong ammonia water while stirring, so as to obtain a mixed slurry; step three, filtering, washing and drying the mixed slurry; step four, sintering in a muffle furnace to obtain the rare earth surface modified aluminum nitride powder. The powder cannot be hydrolyzed after being soaked in water at 60 DEG.C for 30 hours, and the wetting angle of the powder and the copper at 1200 DEG.C is 85-89 DEG according to a sessile drop method, and the powder can be applied to a metal-based composite material as reinforcement.

Description

technical field [0001] The invention relates to a method for modifying aluminum nitride powder. Background technique [0002] AlN ceramics have high thermal conductivity (theoretical value is 320W / mK, the actual value can reach 100-28W / mK, which is equivalent to 5-10 times of the traditional substrate material alumina), excellent insulation, high temperature resistance and corrosion resistance It has the advantages of matching with the thermal expansion coefficient of silicon, and has become an ideal heat dissipation and packaging material for a new generation of large-scale integrated circuits, semiconductor module circuits and high-power devices. In addition, AlN can also be used as a protective tube for thermocouples, a spark plug for electronic igniters and an additive for advanced refractory materials. Transparent AlN plates can be used as high-temperature windows for light and electromagnetic waves. In addition, AlN can be combined with other polymer materials or met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/628C04B35/582
Inventor 宋美慧苏桂明李岩于倩
Owner HEILONGJIANG HEIKE TECH CO LTD
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