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Preparation method for reinforced titanium matrix composite of three-dimensional network-shaped carbon nanotube

A technology of titanium-based composite materials and carbon nanotubes is applied in the preparation of composite materials and the preparation of three-dimensional network carbon nanotube-reinforced titanium-based composite materials. The effect of complete structure, high purity and uniform dispersion

Inactive Publication Date: 2014-01-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the general method of preparing CNTs-reinforced titanium-based composites, the composite powder of CNTs and titanium is first prepared, and then the titanium-based composites are prepared by powder metallurgy. One of the problems is that titanium and CNTs are exposed to high temperature (generally above 900°C). It is easy to react and generate titanium carbide particles, which destroys the good structure of CNTs, and the generated titanium carbide is a hard phase, and when the content exceeds a certain value, the performance of the composite material will be reduced

Method used

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  • Preparation method for reinforced titanium matrix composite of three-dimensional network-shaped carbon nanotube
  • Preparation method for reinforced titanium matrix composite of three-dimensional network-shaped carbon nanotube
  • Preparation method for reinforced titanium matrix composite of three-dimensional network-shaped carbon nanotube

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 10g of sodium chloride and 200g of agate balls were milled for 40 minutes at a rotating speed of 500 rpm to obtain sodium chloride powder with an average particle size of 30 μm. Take 10 g of 400-mesh titanium powder and 7.08 g of ball-milled sodium chloride and put them into a drum mixer for mixing for 2 hours. Then take 0.6g of the mixed powder of ball-milled sodium chloride and titanium powder and press it on a powder tablet press with a Φ10 mold, the pressure is 8MPa, and the holding time is 2min. Place the block obtained by tableting in a tube furnace, pass in 300ml / min of Ar gas as a protective gas, raise the temperature to 790°C at a heating rate of 10°C / min and keep it for 2 hours, and then continue to heat up at a rate of 10°C / min Heat at 1100°C for 2 hours, then cool to room temperature with the furnace. The sintered block was placed in hot circulating water at 80° C. for 8 hours to remove sodium chloride therein, ultrasonicated for 30 minutes to remove impuri...

Embodiment 2

[0023] Concrete method and step are with embodiment 1, and different conditions are: Change 0.2908g nickel nitrate hexahydrate and 0.1264g yttrium nitrate hexahydrate into 0.02908g nickel nitrate hexahydrate and 0.01264g yttrium nitrate hexahydrate, due to the reduction of catalyst amount, The amount of CNTs obtained after the catalytic cracking reaction is reduced and the distribution in the matrix is ​​not uniform.

Embodiment 3

[0025]The specific method and steps are the same as in Example 1, but the different conditions are: 0.2908g nickel nitrate hexahydrate and 0.1264g yttrium nitrate hexahydrate are changed to 0.2910g cobalt nitrate hexahydrate, and the morphology of CNTs obtained after the catalytic cracking reaction is good, and in A uniformly dispersed layer can be formed on the surface of porous titanium particles.

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Abstract

The invention discloses a preparation method for a reinforced titanium matrix composite of a three-dimensional network-shaped carbon nanotube. The method comprises the processes as follows: sodium chloride powder and pure titanium powder are mixed into a blank, and sintering and dissolution are performed, so that porous titanium is obtained; and the porous titanium is immersed into a catalyst solution prepared through cobalt nitrate or nickel nitrate and yttrium nitrate, and the porous titanium loaded with catalyst salt is subjected to calcination, hydrogen gas reduction and catalytic cracking, so that the reinforced titanium matrix composite of the three-dimensional network-shaped carbon nanotube is obtained. The preparation method has the advantages as follows: on one hand, a catalyst, a growth technology and the like are adjusted, so that the carbon nanotube with homo-disperse and an integral structure can directly grow on the porous titanium; and on the other hand, the porous titanium can be directly taken as a composite material matrix, so that a subsequent high-temperature sintering process is avoided, an integral structure of the matrix and a reinforced phase is guaranteed, and the preparation process of the method is simple, and the implementation and the promotion are facilitated.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional network carbon nanotube reinforced titanium-based composite material, which belongs to the preparation technology of composite materials. Background technique [0002] Since the discovery of carbon nanotubes (CNTs) by Japanese scientist Iijima in 1991, they have attracted the attention of researchers due to their unique structure and excellent performance. Carbon atoms in carbon nanotubes use sp 2 hybridized, compared to sp 3 hybridization, sp 2 The S orbital composition in the hybridization is relatively large, so that the carbon nanotubes have high modulus and high strength. Due to its low density (1.3g / cm 3 ) and high Young's modulus (973GPa) carbon nanotubes become an ideal reinforcement phase for the preparation of composite materials. Previous studies have shown that CNTs enhance the characteristics of metal matrix composites, mainly some industrial metals like aluminum, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/00C22C101/10
Inventor 赵乃勤雷红师春生何春年刘恩佐李家俊
Owner TIANJIN UNIV
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