Barium titanate@boron nitride composite with one-dimensional core-shell structure and preparation method

Abstract

The invention provides a barium titanate@boron nitride composite with a one-dimensional core-shell structure and a preparation method. A microwave hydrothermal method is adopted for preparing raw materials; the prepared product has an excellent one-dimensional core-shell structure; a shell layer is made from boron nitride; a core layer is made from boron nitride; the diameter of the core layer is50-150nm; the thickness of the shell layer is 20-200nm; the length of the composite is 2-6mum; the thickness of the shell layer is controllable. The barium titanate@boron nitride composite with the one-dimensional core-shell structure, provided by the invention, is capable of forming a thermal conductive network under the condition of relatively low filling content; the barium titanate of the corelayer with high dielectric property is capable of supplying a higher dielectric constant to the composite; the boron nitride of the shell layer has higher heat conductivity and is capable of promoting the heat dissipation condition of the composite; and meanwhile, and the boron nitride material has an excellent breakdown resistance, so that the composite can work under a higher electric field.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a barium titanate@boron nitride composite material with a one-dimensional core-shell structure and a preparation method. Background technique [0002] With the development of pulse power technology, energy storage capacitors with high energy storage density and high conversion efficiency have attracted more and more attention in pulse power systems. At present, the most studied high energy storage capacitor materials include high dielectric ferroelectric ceramic materials, Glass ceramics, polymer materials, etc., BaTiO 3 Base ferroelectric ceramics have high dielectric constant, but low breakdown field strength, while polyvinylidene fluoride (PVDF) materials have good flexibility, high breakdown field strength, light weight and other advantages, but the dielectric constant low (usually less than 10), so both are limited in their energy storage capabilities...

AI Technical Summary

Problems solved by technology

[0002] With the development of pulse power technology, energy storage capacitors with high energy storage density and high conversion efficiency have attracted more and more attention in pulse power systems. At present, the most studied high energy storage capacitor materials include high dielectric ferroelectric ceramic materials, Glass ceramics, polymer materials, etc., BaTiO 3 Base ferroelectric ceramics have high dielectric constant, but low breakdown field strength, while polyvinylidene fluoride (PVDF) materials have good flexibility, high breakdown field strength, light weight and other advantages, but the dielectric constant low (usually less than 10), so both are limited in their energy storage capabilities

Therefore, the researchers proposed to prepare organic-inorganic composite materials to improve the energy storage characteristics of materials. Generally, ceramic phase high dielectric constant fillers are added to the polymer matrix. Although the energy storage performance of composite materials has been improved to a certain extent, and the ceramic phase The uneven distribution of the phase in the polymer also causes the instability of the material. At the same time, a large amount of heat is generated inside the composite material, which is difficult to diffuse, which makes it difficult for the composite material to operate stably for a long time. Therefore, the composite material with high thermal conductivity and high energy storage density is prepared. The material received widespread attention

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