Preparation method for carbon nano-tube enhanced aluminum nitride composite material

A carbon nanotube and composite material technology, which is applied in the field of composite material preparation, can solve the problems of high synthesis cost of aluminum nitride ceramic powder, difficult low-temperature densification and sintering, insufficient mechanical properties, etc., to solve the problem of carbon nanotube dispersion and Effects of low temperature sintering, lower sintering temperature, and improved mechanical properties

Active Publication Date: 2009-03-18
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a new type of ceramic material with excellent comprehensive performance also has certain defects.
For example, in some application fields, its mechanical properties are insufficient, the synthesis cost of aluminum nitride ceramic powder is high, and it is difficult to achieve low-temperature densification and sintering, etc.

Method used

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  • Preparation method for carbon nano-tube enhanced aluminum nitride composite material
  • Preparation method for carbon nano-tube enhanced aluminum nitride composite material
  • Preparation method for carbon nano-tube enhanced aluminum nitride composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the preparation of CNTs (1wt%) / AlN composite material

[0027] 1. Chemical purification of carbon nanotubes: the multi-walled carbon nanotubes with a diameter of 20 to 40 nm, a length of 5 to 15 μm and a purity of 95% are placed in sodium hydroxide ( NaOH) solution for 1 hour, filtered, washed with distilled water and dried; then the dried carbon nanotubes were placed in nitric acid (HNO 3 ) solution for 1 hour, washed with distilled water and dried to obtain purified carbon nanotubes. (The sodium hydroxide solution can be replaced by sodium carbonate solution or ammonia water, and the nitric acid solution can be replaced by sulfuric acid.)

[0028] 2. Ultrasonic dispersion of carbon nanotubes: place the purified carbon nanotubes in absolute ethanol, which contains 2 wt% dispersant triton in the absolute ethanol, and ultrasonically disperse them for 12 hours using an ultrasonic cleaner. The dispersed carbon nanotubes are obtained. The dispersant may als...

Embodiment 2

[0034] Embodiment 2: the preparation of CNTs (3wt%) / AlN composite material

[0035]1. Chemical purification of carbon nanotubes: the multi-walled carbon nanotubes with a diameter of 20 to 40 nm, a length of 5 to 15 μm and a purity of 95% are placed in a sodium hydroxide solution with a concentration of 4mol / L and a temperature of 80°C ( NaOH) for 1 hour, filtered, washed with distilled water and dried; then the dried carbon nanotubes were placed in a nitric acid solution (HNO 3 ) for 1 hour, washed with distilled water and dried to obtain purified carbon nanotubes.

[0036] 2. Ultrasonic dispersion of carbon nanotubes: place the purified carbon nanotubes in absolute ethanol, which contains a dispersant triton with a mass percentage of 2wt%, and use an ultrasonic cleaner to ultrasonically disperse for 12 hours to obtain dispersed carbon nanotubes.

[0037] 3. Mixing and ball milling dispersion: Take 18.6g of aluminum nitride, 0.4g of yttrium oxide, 0.4g of calcium fluoride an...

Embodiment 3

[0042] Embodiment 3: the bulk preparation of CNTs (3wt%) / AlN composite material

[0043] 1. Chemical purification of carbon nanotubes: the multi-walled carbon nanotubes with a diameter of 20 to 40 nm, a length of 5 to 15 μm and a purity of 95% are placed in a sodium hydroxide solution with a concentration of 4mol / L and a temperature of 80°C ( NaOH) for 1 hour, filtered, washed with distilled water and dried; then the dried carbon nanotubes were placed in a nitric acid solution (HNO 3 ) for 1 hour, washed with distilled water and dried to obtain purified carbon nanotubes.

[0044] 2. Ultrasonic dispersion of carbon nanotubes: place the purified carbon nanotubes in absolute ethanol, which contains a mass percentage of 2wt% dispersant triton, and use an ultrasonic cleaner to ultrasonically disperse for 12 hours to obtain a dispersed after carbon nanotubes.

[0045] 3. Mixing ball mill dispersion: take 18.6kg of raw materials aluminum nitride, 0.4kg of yttrium oxide, 0.4kg of ca...

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Abstract

This invention relates to carbon nanometer tubes reinforced aluminium nitride composite material, and its preparation method. The preparation procedures are: the carbon nanometer tubes (1-3wt%) being chemically purified, ultrasonic dispersed, being mixed with aluminium nitride (89-95wt%) and agglutinants: yttrium oxide (2-4wt%) and calcium fluoride (2-4wt%); proceeding ball-milling dispersing to produce mixture slurry, drying, milling, sieving and finally pressure sintered to obtain this inventive product with excellent mechanical properties. This invention is of low temperature compacting agglutination with simple process and low cost.

Description

technical field [0001] The invention relates to a preparation method of a composite material with metal nitride as a matrix, in particular to a preparation method of a non-metallic fiber reinforced aluminum nitride composite material. Background technique [0002] At present, the further integration of circuits has put forward higher requirements on the performance of substrate materials. Due to the increase of current density per unit size, heat dissipation has become a key issue in the manufacturing process of integrated circuits. Statistical analysis of the failure causes of electronic products shows that 55% of electronic product failures are caused by "heat", 20% by "vibration", 19% by "humidity", and 6% by "dust". Therefore, the basis of high thermal conductivity Sheet materials have become a focus of international experts in this field. For a long time, the ceramic packaging and substrate materials of most electronic devices have been using alumina ceramics, but its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/582
Inventor 周新贵于海蛟车仁超王洪磊王志毅张长瑞
Owner NAT UNIV OF DEFENSE TECH
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