Patent ID: 6416852
Filing Date: 2002-07-09
Classification: C04B,E01F,G10K,Y10T

Abstract:
A stain resistant ceramic sound absorption material obtained by steps comprising:calcining a blend of a refractory material and a combustible pore-forming material to obtain an air-permeable substrate having communicating pores with pore diameters of 0.2 to 2,000 &mgr;m and an air permeability of at least 1 cm3Â·cm/cm2Â·secÂ·cmH2O and non-communicating sound absorbing holes and grooves; applying a glaze to said air-permeable substrate wherein said glaze covers top surface of said air-permeable substrate to fill said communicating pores and wherein said non-communicating holes and grooves remain unfilled and further said glaze is substantially free from air permeability and provides for a surface which is resistant to staining.