Sound absorption and physical properties of carbonized fiberboards with three different densities

Abstract

Characteristics of carbonized liberboard such as chemical materials absorption, electromagnetic shielding, and electrical and mechanical performance were determined in previous studies. The carbonized board therefore confirmed that having excellent abilities of these characteristics. In this study, the effect of density on physical properties and sound absorption properties of carbonized fiberboards at 800°C were investigated for the potential use of carbonized fiberboards as a replacement of conventional sound absorbing material. The thickness of fiberboards after carbonization was reduced 49.9%. 40.7%, and 43.3% in low density liberboard (LDF). medium density liberboard (MDF), and high density liberboard (HDF), respectively. Based on SEM images, porosity of carbonized liberboard increased by carbonization due to removing adhesives. Moreover, carbonization did not destroy structure of wood fiber based on SEM results. Carbonization process influenced contraction of liberboard. The sound absorption coefficient of carbonized low density liberboard (c-LDF) was higher than those of carbonized medium density liberboard (c-MDF) and carbonized high density liberboard (c-HDF). This result was similar with original fiberboards, which indicated sound absorbing ability was not significantly changed by carbonization compared to that of original fiberboards. Therefore, the sound absorbing coefficient may depend on source, texture, and density of fiberboard rather than carbonization.