METHOD FOR FORMING REFRACTORY COATING LAYER

摘要

PROBLEM TO BE SOLVED: To provide a forming method for a refractory coating layer capable of improving refractory performance without deteriorating the acoustic absorption performance of a porous acoustic absorption board using a phenolic resin.SOLUTION: There is provided a method for forming a refractory coating layer comprising an aluminum silicate-based refractory coating material on the surface of a porous acoustic absorption board made by a phenolic resin. The method includes forming a refractory coating layer by spray coating, and heating and drying the porous acoustic absorption board on which the refractory coating layer is formed at a previously set prescribed heating temperature for a prescribed heating time. Thereby, the uniform refractory coating layer is formed on the surface of the porous acoustic absorption board.SELECTED DRAWING: Figure 2