A kind of silicon carbide nanometer heat-insulating wave-absorbing composite material and preparation method thereof

Abstract

The invention discloses a silicon carbide nanometer heat-insulating wave-absorbing composite material and a preparation method thereof. The template forms the reinforced interface of the SiC coating with discontinuous and discontinuous distribution on the surface. During the chemical vapor infiltration process, the initial SiC nanowires are prepared by the first ventilation and then the heating technology, and the reinforced interface with the SiC coating forms a "T"-shaped pinning structure. , and then use high-temperature oxidation and high-speed carrier gas flow to remove the residual catalyst, and the prepared secondary silicon carbide nanowires and the initial silicon carbide nanowires form a "T"-shaped pinning structure, which is intertwined to form a silicon carbide nanowire network structure. The silicon carbide coating enhances the continuous fusion of the interface and the silicon carbide nanowires penetrate through the cells, which effectively prolongs the heat transmission path, promotes the reflection and absorption of electromagnetic waves, and synergistically improves the thermal insulation performance.

Description

technical field [0001] The patent of the present invention relates to a heat-insulating wave-absorbing composite material, in particular to a silicon carbide nano-heat-insulating wave-absorbing composite material, which can realize long-term application under high temperature and complex service conditions. [0002] technical background [0003] With the development and application of electromagnetic technology, various electronic and electrical products are widely used in various fields of social life. When electronic equipment is running, it will generate strong electromagnetic wave radiation to the surrounding environment to achieve signal transmission, but it will inevitably affect the ecological environment. The environment and humans themselves produce serious electromagnetic pollution. The complex electromagnetic network generated by the interaction of equipment signals not only interferes with the normal operation of electronic systems, but also aggravates the threat t...

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Problems solved by technology

However, this invention is a one-dimensional nano-wave absorbing material, which does not have the structural advantages of a three-dimensional space network

[0009] As shown in the above-mentioned patents, in order to realize the preparation of high-temperature-resistant heat-insulating and wave-absorbing materials, silicon carbide materials are generally used as the main material for design, but it is difficult to effectively balance heat-insulating and wave-absorbing performances during the preparation process, and at the same time, the space structure The design is relatively simple and cannot achieve the expected goal

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