process of making a porous ceramic part, porous ceramic foam and using a ceramic foam

摘要

MANUFACTURING PROCESS OF A POROUS CERAMIC PART, POROUS CERAMIC FOAM AND USE OF A CERAMIC FOAM A process for the manufacture of a porous ceramic part comprising the following successive steps: (a) preparation of an M mixture containing a suspended ceramic powder, at least one agent gelling agent and at least one foaming agent at a mixing temperature above the gelling temperature of said gelling agent, b) shearing said mixture M at a foaming temperature above said gelling temperature until a foam is obtained, and gelling said foam by cooling said mixture M to a temperature below the gelling temperature of said gelling agent, d) drying said gelled foam to a preform. According to the invention, to said mixture M is added a stabilizing agent whose instantaneous viscosity, in Pa. S, increases at least a factor ten when a shear rate of said stabilizing agent decreases from 100s¬ -1¬ to 0s¬. -1¬.