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

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...

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

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