Preparation of Light Weight Porous Ceramics and Sound Absorption Performance Research

Abstract

Light weight porous ceramics were successfully prepared by conventional mold. Effects of particle sizes, content of pore-forming agent and sample thickness on sound absorption performance of porous ceramics were studied by means of JTZB absorption coefficient measurement. The results indicate that when pore-forming agent content is 50vol%, sound absorption performance of macroporous ceramics is better than that of microporous ones. As the pore-forming agent content increases, the sound absorption peak moves from low frequency to high frequency, with the peak value increasing from 0.41 to 0.82. Neither high nor low porosity can improve the sound absorption material performance. The first sound absorption peak gradually moves towards the low frequency when sample thickness increasing from 10 mm to 30 mm. The sample obtains super sound absorption performance when pore-forming agent content is 60vol% and sample thickness is 20 mm. By adding cavity layer to the porous ceramics rear one by one, the sound absorption peak moves from high frequency to low frequency and the average sound absorption coefficient gradually increases with the increase of cavity layer number.