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Carbon nanotube reinforced alumina ceramic composite material and its preparation method

A technology of alumina ceramics and carbon nanotubes, which is applied in the fields of carbon nanotube-reinforced alumina ceramic composite materials and its preparation, non-metallic fiber-reinforced alumina ceramic composite materials and its preparation, and can solve the problems of low efficiency and high cost. Achieve the effect of simple process, low cost and good performance

Active Publication Date: 2011-09-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the actual experiment and production application of alumina ceramics, hot pressing sintering or spark plasma sintering are generally used. For example, Mehdi Estili of Japan prepared carbon nanotube toughened alumina ceramic composite materials by hot pressing sintering method. But these two methods are inefficient and costly

Method used

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  • Carbon nanotube reinforced alumina ceramic composite material and its preparation method
  • Carbon nanotube reinforced alumina ceramic composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1CNTs-Al 2 o 3 Preparation of composite materials

[0036] 1. Carbon nanotube pretreatment

[0037] Place the carbon nanotubes in a mixed acid of 98% concentrated sulfuric acid and 68% concentrated nitric acid with a volume ratio of 3:1, heat at 110°C for 20Min, and centrifuge after cooling at a speed of 14000R / min, and wash with distilled water to pH value is equal to 7, the carbon nanotubes after pickling are placed in absolute ethanol, and this absolute ethanol contains the dispersant sodium dodecylbenzene sulfonate that mass percent concentration is 4wt% in this absolute ethanol, and drying after ultrasonic dispersion 12 hours and drying the carbon nanotubes obtained after ultrasonic dispersion at 80° C. to obtain pretreated carbon nanotubes.

[0038] 2. Preparation of mixed powder

[0039] Take 17.9g of alumina, 0.18g of magnesia, and 0.015g of yttrium oxide as raw materials, put the above-mentioned raw materials in a corundum ball milling tank, the bal...

Embodiment 2

[0047]Example 2CNTs-Al 2 o 3 Preparation of composite materials

[0048] The difference between this example and Example 1 is that the holding time at the sintering temperature is 0.5h. Others are the same as embodiment 1. The density of the carbon nanotube-reinforced alumina ceramic composite material of this embodiment is 98.02%. Compared with the alumina ceramics without adding carbon nanotubes, the three-point bending strength is increased by more than 40%, and the fracture toughness is increased by 15%. %about.

Embodiment 3

[0049] Example 3CNTs-Al 2 o 3 Preparation of composite materials

[0050] The difference between this embodiment and Embodiment 2 is that the sintering temperature is 1550°C. Others are the same as embodiment 2.

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Abstract

A carbon nanotube reinforced alumina ceramic composite material contains the following ingredients of: 91-98 wt% of Al2O3, 0.5-8 wt% of CNTs, 0.5-1.5 wt% of MgO and 0.05-0.15 wt% of Y2O3. The method for preparing the carbon nanotube reinforced alumina ceramic composite material comprises the following steps of: crushing the above Al2O3, MgO and Y2O3 materials by wet milling for 24-72 hours; adding the pretreated CNTs and continuously crushing by wet milling for 8-12 hours to produce a mixed slurry; drying the mixed slurry and crushing to obtain mixed powders (I); adding the mixed powders (I) into a paraffin-containing gasoline solvent to perform ultrasonic dispersion for 1-2 hours; drying, crushing and sieving through a 60 to 200-mesh sieve to obtain mixed powders (II); carrying out tabletting and de-waxing treatments on the mixed powders (II) to obtain sample sheets; placing the sample sheets into a graphite oven and performing the powder embedded pressureless sintering in Ar atmosphere at the temperature of 1500-1800 DEG C for 0.5-4 hours to produce the composite material. The composite material provided by the invention is characterized in that its density can reach more than 95%, its three point bending strength is raised by over 40% and its fracture toughness is increased by about 15%.

Description

[0001] 1. Technical field [0002] The present invention relates to a composite material with ceramics as the matrix and its preparation method, in particular to a non-metallic fiber reinforced alumina ceramic composite material and its preparation method, specifically a carbon nanotube reinforced alumina ceramic composite material and its preparation method. 2. Background technology [0003] Alumina ceramics are the ceramic materials with the widest application, the widest application and the largest output among oxide ceramics. It is widely used in machinery, electronic power, chemical industry and medicine. At present, alumina ceramics are becoming more and more important in high-tech fields such as aerospace. Alumina ceramics have a high melting point, high hardness, and excellent thermal and chemical stability, and are one of the excellent engineering ceramic materials. However, due to the influence of flexural strength and fracture toughness, its comprehensive mechanic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 凤仪赵景淞李斌张学斌陈楠楠陈凡燕陈杰
Owner HEFEI UNIV OF TECH
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