Abstract: The development and preparation of sound-absorbing materials based on coal waste can solve the problem of industrial waste and environmental noise pollution. In this work, the sound-absorbing foam ceramics were successfully prepared by using coal gangue and waste glass slag as the basic framework and silicon carbide (SiC) as foaming agent by direct foaming method. The effect of sintering temperature and time on the porosity, thermal conductivity and sound absorption properties of the samples was explored emphatically, while the micro morphology and pore size distribution of the samples were analyzed. The results show that when m (coal gangue)∶m (glass slag)∶m (clay)=60∶20∶20, addition content of SiC is 0.7%, the optimal sintering temperature is 1 175 ℃, and the sintering time is 40 min, foam ceramic has low thermal conductivity and good sound absorption ability, with true porosity and thermal conductivity of 77.3% and 0.19 W/(m·K), respectively, the average sound absorption coefficient of 0.41 at 200—6 300 Hz, and the peak value of medium and high frequency absorption of 0.95. It is expected to be used as a thermal insulation and noise reduction material in the construction industry.
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2025, Vol. 39 
