| 摘要 |
PROBLEM TO BE SOLVED: To obtain an improved sound absorbing material which obviates the occurrence of degradation in strength and the dislodgment of ceramic particles in spite of exposure to a hightemp. atmosphere, such as fire, by adding a resin binder and an inorg. binder to an oxide ceramic grains and subjecting this mixture to pressurizing and integal molding. SOLUTION: The oxide ceramic grains are used as aggregate and the resin binder and the inorg. binder are added thereto. The resulted mixture is pressurized and integrally molded. The inorg. binder is adequately borosilicate lead glass and has a compsn. consisting, by weight, of 35 to 65% PbO, 20 to 35% SiO2 , 5 to 20% B2 O3 , and the balance ZnO, Al2 O3 , and others. The coefft. of volumetric expansion of the binder is <=300×l0<-7> . The oxide ceramic particles used as the aggregate include mullite, etc., and the resin binder is preferably thermosetting resins, such as epoxy resins. As a result, the inorg. binder is made into a pasty form and play the role of preventing the dislodgment of the ceramic particles.
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