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Preparation method of aluminum nitride-aluminum composite material

An aluminum composite material and aluminum nitride technology, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of low thermal conductivity and mechanical strength, uneven distribution, and high production cost of aluminum nitride-aluminum composite materials. The effect of high yield, uniform distribution and low production cost

Inactive Publication Date: 2020-04-03
山东东大新材料研究院有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is aimed at the existing pore-forming agent and the foaming agent that cause the uneven distribution of pores inside the porous aluminum nitride ceramic prefabricated body matrix, there are a large number of large pores and small closed pores, and the porosity lower, which further leads to the problems of low thermal conductivity and mechanical strength, high production cost, and low yield of aluminum nitride-aluminum composite materials. A method for preparing aluminum nitride-aluminum composite materials is provided to achieve the following invention objectives :

Method used

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  • Preparation method of aluminum nitride-aluminum composite material
  • Preparation method of aluminum nitride-aluminum composite material

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Embodiment 1

[0054] A method for preparing an aluminum nitride-aluminum composite material, comprising the following steps:

[0055] (1) Hollow Al with a particle size of 100 μm and a shell thickness of 20 μm 2 o 3 The microbeads were placed in a vacuum ion carbonitriding furnace, and the temperature was raised to 1350°C at a rate of 5°C / min in a vacuum. Then, according to the mass ratio of 1:6, a mixed gas of methane and nitrogen was introduced for heat treatment, and the pressure was kept at 1250Pa. And keep warm for 30min;

[0056] (2) The AlN microbeads obtained after the heat treatment were ultrasonically cleaned 5 times with absolute ethanol, and centrifugally settled, and then the microbeads were dried in an 80° C. drying oven for 12 hours;

[0057] (3) According to the mass ratio, the dried AlN microbeads and MgO powder, SiO 2 powder, Al powder = 98:2:4:5, mixed with 1.0% PVA solution at a ratio of 100:100 to form a slurry and stirred for 24 hours until uniformly mixed; the 1.0%...

Embodiment 2

[0065] A method for preparing an aluminum nitride-aluminum composite material, comprising the following steps:

[0066] (1) Hollow Al with a particle size of 200 μm and a shell thickness of 45 μm 2 o 3 The microbeads are put into a vacuum ion carbonitriding furnace, and the temperature is raised to 1450°C at 10°C / min under vacuum, and then, according to the mass ratio of 1:9, a mixed gas of propane and nitrogen is introduced for heat treatment, and the pressure is kept at 950Pa. And keep warm for 60min;

[0067] (2) The AlN microbeads obtained after the heat treatment were ultrasonically cleaned 3 times with absolute ethanol, and centrifugally settled, and then the microbeads were dried in a drying oven at 120° C. for 6 h;

[0068] (3) According to the mass ratio, the dried AlN microbeads and MgO powder, SiO 2 Powder, Al powder = 95:5:8:5 mixed evenly, mixed with PVA solution with a concentration of 1.5% in a ratio of 100:150 to form a slurry and stirred for 24 hours until ...

Embodiment 3

[0076] (1) Hollow Al with a particle size of 150 μm and a shell thickness of 30 μm 2 o 3 The microbeads were put into a vacuum ion carbonitriding furnace, and the temperature was raised to 1200°C at 20°C / min under vacuum, and then, according to the mass ratio of 1:9, a mixed gas of propane and nitrogen was introduced for heat treatment, and the pressure was kept at 1100Pa. And keep warm for 45min;

[0077] (2) The AlN microbeads obtained after the heat treatment were ultrasonically cleaned 5 times with absolute ethanol, and centrifugally settled, and then the microbeads were dried in a drying oven at 100°C for 8 hours;

[0078] (3) According to the mass ratio, mix the dried AlN microbeads with MgO powder, SiO2 powder, Al powder=97:2:4:6, and mix it with the PVA solution with a concentration of 0.5% in a ratio of 100:120 to form a slurry Stir the ingredients for 15 hours until they are evenly mixed;

[0079] (4) Put the mixed slurry into a drying oven at 150°C for 18 hours; ...

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Abstract

The invention relates to a preparation method of an aluminum nitride-aluminum composite material, and belongs to the field of electronic packaging materials, wherein the method comprises: ion carbonitriding treatment, cleaning, mixing, sintering and gaseous aluminizing. According to the method, hollow aluminum oxide micro-beads are changed into hollow aluminum nitride micro-beads with nano-scale perforations in the shell wall by adopting an ion carbonitriding process, wherein the temperature of the vacuum ion carbonitriding heat treatment is 1200 to 1450 DEG C, the heating rate is 5-20 DEG C / min, and the heat preservation time is 30-60 min; a porous aluminum nitride billet is obtained without adding of pore forming agents and foaming agents; and an aluminum nitride-aluminum composite material with high density, high thermal conductivity and high comprehensive mechanical strength is obtained through a gaseous aluminizing process. According to the invention, the composite material is widely applied to high-temperature heat dissipation elements, high-power microwave integrated circuits, power electronic devices, high-power laser or LED lighting electronic packaging.

Description

technical field [0001] The invention belongs to the technical field of electronic packaging materials, and in particular relates to a preparation method of an aluminum nitride-aluminum composite material. Background technique [0002] Aluminum nitride ceramics have good application prospects in the industrial field due to their excellent mechanical properties, oxidation resistance, high thermal conductivity, and low thermal expansion coefficient. Aluminum nitride-aluminum composite materials not only have the above-mentioned characteristics of aluminum nitride ceramics, but also have the properties of high thermal conductivity, high toughness, and low density of metal aluminum, and are excellent heat dissipation materials. , power electronic devices, high-power laser or LED lighting electronic packaging has a wide range of applications. [0003] At present, the industry generally uses additives such as pore-forming agents and foaming agents to prepare porous aluminum nitrid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/582C04B35/626C04B35/622C04B41/88C04B38/08C04B38/02
CPCC04B35/581C04B35/622C04B35/6268C04B35/62695C04B38/085C04B41/009C04B41/5155C04B41/88C04B2235/3206C04B2235/3217C04B2235/3418C04B2235/402C04B2235/96C04B2235/9607C04B38/0074C04B38/02C04B41/4529
Inventor 孙卫康刘素冰李庆春汤志强茹红强王春华
Owner 山东东大新材料研究院有限公司
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