Researchers University jointly synthesized airgel meter hyperbolic structure of the ceramic layered structure

China Aviation Daily News: Recently, the Harbin Institute of Technology, Lanzhou University, University of California Los Angeles, University of California, Berkeley and other universities together researchers synthesized meter hyperbolic structure of the ceramic layered structure Aerogels , the material can greatly enhance the performance of traditional ceramic airgel material, it provides research ideas for solving the problem of brittle ceramic ultra-light structure, and thermal crystallization problems and promote the ceramic airgel insulation, catalysis, energy , applications of environmental management, aviation and aerospace. Ceramic aerogels for its lightweight, fire-resistant, corrosion-resistant, high temperature and other characteristics, is suitable for use as insulation material in the aerospace field, but its brittle, high temperature crystallization, thermal shock collapse and other problems have seriously restricted the research and application. The research results obtained on the basis of studies of graphene airgel five years, and took two years to complete. According to project leader, Associate Professor of Harbin Institute of Technology Xu Xiang introduction, basic research projects completed early super-elastic graphene airgel, a negative Poisson\’s ratio, ultra-light, conductive, fluid behavior, energy consumption and behavior research. On this basis, the use of CVD technology team graphene airgel template situ deposition of the ceramic, and by the method of heating the etching template, not only the ceramic airgel having a negative Poisson\’s ratio characteristics, and through the aperture wall \”double-walled\” sub-structure, while achieving a negative thermal expansion properties of the ceramic aerogels, thereby enhancing the mechanical properties of ceramic airgel thermal and the like. Xu Xiang said that the preparation of ceramic airgel CVD is the key to the study. To give ceramic airgel flexibility, control the wall thickness of the wall of the hole, to improve the crystallinity of the ceramic aerogels, and to achieve the structural design, the researchers repeated the experiment after nearly a thousand times. The ceramic aerogels having ultra-light measurement system characteristics such commercial test its thermal conductivity can not, therefore, build a team of specialized measurement equipment, and the reliability of the feasibility studies. The researchers said the study is only the beginning, the research team will continue to develop more flexible, able to adapt to higher operating temperatures, has a lower thermal conductivity of the ceramic ultra-light airgel structure, to further promote multi-ceramic airgel a wide range of applications.

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