Method for quickly shortening carbon nano tubes and uniformly scattering carbon nano tubes in metal powder

Abstract

The invention provides a method for quickly shortening carbon nano tubes and uniformly scattering the carbon nano tubes in metal powder. The method comprises the steps that low-temperature liquid media are introduced on the basis of common high-energy ball milling, then, wet ball milling is further adopted, and by utilizing the characteristic that the deformation feature of a material at the low temperature is changed, the effect that the carbon nano tubes are quickly shortened and uniformly scattered in the metal powder is achieved under multiple mechanical actions such as collision and stirring. Compared with common ball milling, the method has the advantages that the processing time is short, scattering of the carbon nano tubes is more uniform, the powder purity degree is high, and metal grains are small. After the high-dispersion carbon nano tubes / metal powder prepared through the method is solidified and formed, a carbon nano tube reinforced metal matrix composite with good performance can be directly obtained.

Description

technical field [0001] The invention provides a method for realizing rapid and uniform dispersion of carbon nanotubes in metal matrix powders, which is the basis for preparing carbon nanotube-reinforced metal matrix composite materials with uniform microstructure and excellent performance, and belongs to the technical field of metal matrix composite materials. Background technique [0002] Metal matrix composites have high specific strength, specific modulus, good electrical and thermal conductivity, and high temperature performance. They have been applied in aerospace, automotive, and microelectronics fields and have attracted more and more attention. Carbon nanotubes have a unique structure and excellent physical and chemical properties (the Young's modulus can reach 1-1.8TPa, the tensile strength can reach 150GPa, and the density can reach 1.2-1.8g / cm 3 , the thermal expansion coefficient is almost zero, and it also has good toughness and plastic deformation ability), its...

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Problems solved by technology

For example, applying high-energy ultrasound in an organic solvent has a good effect on the dispersion of carbon nanotubes alone, but there are problems in mixing the two evenly after adding metal powder, and it is also necessary to consider whether the composite powder is easy to dry; The ball milling operation is relatively simple and can be processed in batches. It is one of the most widely used methods at present, but the ball milling time is long and the damage to the carbon nanotubes is large; the in situ synthesis method will introduce Fe, Co, Ni and other metals into the composite powder Catalyst particles cannot be removed, and the crystallinity and performance of carbon nanotubes themselves cannot be guaranteed to be optimal, etc.

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