A method for adjusting the alignment direction of ceramic nanowires in composite materials

Abstract

The invention belongs to the field of the dielectric composite materials, and particularly relates to a method for controlling an arrangement direction of ceramic nanowires in a composite material. According to the technical scheme adopted by the invention, the method for controlling the arrangement direction of the ceramic nanowires in the composite material comprises the following steps of: preparing ceramic nanowires / polymer slurry, wherein slurry has a shear thinning phenomenon within a shearing rate range of 0.1-100 1 / s; removing bubbles in the slurry; and extruding the slurry from a slurry extruding device from a discharge hole with a hole diameter of 10-200 [mu]m, thereby obtaining characteristic linear fluid, and controlling movement track of the discharge hole. The method adopts the 3D printing technology to arrange ceramic nanowires in the slurry in an oriented mode, and controls the arrangement direction of the nanowires, so that performance of the composite material is controlled.

Description

technical field [0001] The invention belongs to the field of dielectric composite materials, and in particular relates to a method for adjusting and controlling the arrangement direction of ceramic nanowires in composite materials. Background technique [0002] In recent years, in order to alleviate the environmental pollution and energy shortage caused by fossil energy, renewable energy technologies such as solar cells, lithium batteries and capacitors have developed rapidly. Among them, capacitors have faster charging and discharging speeds than lithium batteries and other energy storage devices. Fast, good stability and low cost advantages, suitable for high-power electronic equipment. However, current high-power capacitors generally have the defect of low energy density. Therefore, how to increase the energy density of capacitors is the bottleneck of research in this field. [0003] To increase the energy density of dielectric materials, it is necessary to increase its...

AI Technical Summary

Problems solved by technology

The main disadvantage of the biaxial stretching method is: the inhomogeneity and inconsistency inside the composite material lead to different deformations of the composite material under the same stretching force, so that the change of the arrangement direction of the internal nanowires cannot be consistent. At the same time, Biaxial stretching is easy to destroy the internal structure of the composite material, seriously affecting the performance of the composite

The tape-casting process is very rough, and the nanowires are oriented by the shear force of the scraping plate. This shear force has a small effect and the force is different in the thickness direction of the fluid, so the effect of the orientation of the nanowires is not obvious. In addition, the parameters of the casting process, such as speed and force, cannot be accurate, resulting in inconsistent repeatability of each experiment

The preparation of nanowire arrays by hydrothermal method has harsh process conditions and high cost, and only small samples can be prepared

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