Porous ceramic sound absorption material designed on basis of photonic crystal theory and production method thereof

Abstract

The invention relates to a porous ceramic sound absorption material designed on basis of photonic crystal theory and a production method thereof. The porous ceramic sound absorption material is prepared from a ceramic framework, wherein micropores which are periodically arranged are formed in the ceramic framework; the porous ceramic sound absorption material is characterized in that the porosityis 40-70%, the pore diameter is 0.0001-0.001m, the flow resistance rate is 2500-12500Pa.s / m<2>, and the thickness is 20-100mm. The porous ceramic sound absorption material designed on basis of the photonic crystal theory can replace the traditional sound absorption material in multiple places, is capable of avoiding the secondary environment pollution of the inorganic fiber materials such as glasswool caused by dust formation, and can be applied to the outdoor environment; compared with other sound absorption materials, the porous ceramic sound absorption material has incomparable superiority.

Description

technical field [0001] The invention relates to an acoustic functional material, in particular to a porous ceramic sound-absorbing material designed based on the phonon crystal theory and including periodic aperture arrangement. Background technique [0002] The existing traditional sound-absorbing materials are mainly inorganic fiber materials such as glass wool and rock wool. Although these traditional sound-absorbing materials have obvious sound-absorbing effects, low density, light specific gravity, easy installation, heat insulation and flame retardancy, and low price, their performance is greatly affected and restricted by the environment, and they are not suitable for applications such as high temperature and humidity. In harsh working environments such as oil, dust, strong airflow, etc., these working conditions will not only reduce its service life, but also significantly reduce its sound absorption performance, which cannot meet the noise reduction requirements. F...

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Problems solved by technology

As a sound-absorbing material, closed-cell materials that are not connected have too large flow resistance and low porosity, and the pore diameter is not easy to control, resulting in low sound absorption coefficient, which cannot achieve positive design, and can only be measured by experiment. Most of the pore-forming methods adopt the foaming reaction method and the organic matter filling and burning loss method. These pore-forming methods determine the size of the pores and are difficult to grasp

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