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Preparation method of high-thermal-conductivity aluminum nitride ceramic

A technology of aluminum nitride ceramics and high thermal conductivity, which is applied in the field of preparation of high thermal conductivity aluminum nitride ceramics, can solve the problems of limited wide application and high sintering cost, and achieves the promotion of low-temperature liquid phase sintering, reduction of sintering cost, and reduction of oxygen content. Effect

Active Publication Date: 2015-10-14
厦门钜瓷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, its wide application is limited due to high raw material prices and high sintering costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 1. Mixing of raw materials: weigh 1000g of AlN powder, 50g of LaF3 powder, 0.5% stearic acid, and 50g of rubber gasoline, put them into a nylon-lined ball mill jar, add 1500ml of absolute ethanol, and use agate balls as the ball milling medium to carry out ball milling for 24 hours. After taking out and drying, a mixture is obtained.

[0011] 2. Forming: put the dried powder in a mold, and make a green body on a pressure forming machine with a forming pressure of 200 MPa.

[0012] 3. Degreasing and sintering: After the green body is degreased in a flowing nitrogen atmosphere, it is placed in a crucible and sintered in a high-temperature sintering furnace. Keep warm for 4 hours, then lower the temperature to 1750°C, keep warm for 20 hours, and then cool down.

[0013] The aluminum nitride ceramics prepared by this process have a density of 3.35g / cm3, a density of 99.9%, a bending strength of 320Mpa and a thermal conductivity of 210W / m.K.

Embodiment 2

[0015] 1. Mixing of raw materials: weigh 1000g of AlN powder, 50g of LaF3 powder and 0.3% stearic acid, put them into a nylon-lined ball mill jar, add 1500ml of absolute ethanol, and use agate balls as the ball milling medium for 24 hours of ball milling, take out and dry A mixed powder is obtained. 1000g of the dried powder and 220g of binder are put into a kneader for heating and stirring, and the binder components are 60% paraffin, 15% high-density polyethylene, 20% polypropylene, and 5% stearic acid. The heating temperature is 170°C, and the mixing is continued for 1 hour after the feed is in a molten state, and it is taken out after cooling.

[0016] 2. Injection molding: put the feed into the hopper of the injection machine, the injection temperature is 165°C, the injection pressure is 100Mpa, the mold temperature is 50°C, and the injection molding green body is prepared.

[0017] 3. Degreasing and sintering: Soak the injected green body in trichloroethylene for 12 hour...

Embodiment 3

[0021] 1. Mixing of raw materials: weigh 1000g of AlN powder, 60g of EuF3 powder, 0.5% stearic acid, and 50g of rubber gasoline into a nylon-lined ball mill jar, add 1500ml of absolute ethanol, and use agate balls as the ball milling medium to carry out ball milling for 24 hours. After taking out and drying, a mixture is obtained.

[0022] 2. Forming: put the dried powder in a mold, and make a green body on a pressure forming machine with a forming pressure of 400 MPa.

[0023] 3. Degreasing and sintering: After the green body is thermally degreased in a flowing nitrogen atmosphere, it is placed in a crucible and sintered in a high-temperature sintering furnace. After 4 hours of heat preservation, the temperature was lowered to 1740°C, and the heat preservation was carried out for 20 hours, followed by furnace cooling.

[0024] The aluminum nitride ceramics prepared by this process have a density of 3.34g / cm3, a density of 99.8%, a bending strength of 300Mpa and a thermal con...

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Abstract

The invention relates to the technical field of ceramic material preparation, and relates to a preparation method of high-thermal-conductivity aluminum nitride ceramic. According to the invention, aluminum nitride powder is adopted as a base material, and rare earth metal fluoride EuF3, LaF3, SmF3 or a mixture thereof is adopted as a sintering aid. An addition amount of the sintering aid rare earth fluoride accounts for 2-8% of the aluminum nitride powder by mass. Through the steps of wet milling mixing, drying, forming, degreasing and sintering, the aluminum nitride ceramic is formed. The aluminum nitride ceramic has thermal conductivity higher than 200W / m.K, flexure strength greater than 320MPa and a fine grain size. The method provided by the invention has the advantages of simple process, good product performance, low production cost, and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic material preparation, and relates to a preparation method of aluminum nitride ceramics with high thermal conductivity. Background technique [0002] Aluminum nitride has high thermal conductivity, its theoretical value is about 320W / m.K, close to BeO and SiC, more than 5 times that of Al2O3 ceramics, low dielectric constant and dielectric loss, high volume resistivity, and excellent dielectric strength , its mechanical properties are good, its bending strength is much higher than that of BeO ceramics, and it is non-toxic. Make it an ideal heat dissipation substrate and packaging material for large-scale integrated circuits. At present, its wide application is limited due to high raw material prices and high sintering costs. [0003] Regarding the method of preparing aluminum nitride with high thermal conductivity, Chinese patent CN 102898141A discloses a method for preparing special-shaped alumi...

Claims

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Application Information

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IPC IPC(8): C04B35/582C04B35/64
Inventor 秦明礼鲁慧峰何庆吴昊阳曲选辉
Owner 厦门钜瓷科技有限公司
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