| 摘要 |
PROBLEM TO BE SOLVED: To provide a porous ceramic-made sound absorbing material having excellent heat resistance, stable pore diameter and≥20% sound absorption coefficient in 1,000 Hz of frequency. SOLUTION: The porous ceramic-made sound absorbing material is manufactured by firing a ceramic raw material containing a silicate as a main raw material and 0.02-1.0 mass% inorganic foaming agent and has≥20% normal incident sound absorption coefficient in 1,000 Hz of frequency by JIS-A1405. It is preferable that the normal incident sound absorption coefficient has the maximum peak in 1.000±100 Hz of frequency. COPYRIGHT: (C)2007,JPO&INPIT
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