Porous ceramic sound-absorbing material made from soot (Flyash)

Toshiba Ceramics has developed a porous ceramic sound-absorbing material made of waste inorganic soot, such as soot produced by thermal power stations, whose main component is silicon dioxide. This silica, which has ultra-fine pores on the micrometer scale, converts sound energy into heat energy and weakens sound propagation. In the preparation of this ceramic, a special additive is added to the fume during the mixing, followed by baking and curing to form a porous material in the process. The absorption of sound waves is 30.7 dB in the 400 Hz range and 42.9 dB at 1000 Hz. The material also has light, thermal insulation and good weatherability. The company plans to introduce photocatalyst (such as titanium dioxide) into the material, which can achieve the decomposition of nitrogen oxides in the atmosphere, which is of great significance for environmental protection. This sound-absorbing material can be used to build noise barrier walls along highways and along railways.

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