Method for preparing a thin ceramic material with controlled surface porosity gradient, and resulting ceramic material

A method for preparing a thin ceramic material with a controlled surface porosity gradient, comprising:

• a) a step (P) of preparing the porous pore-forming substrate of a controlled thickness;
• b) a step (Q) of preparing a ceramic suspension in a solvent;
• c) a step (A) of infiltrating said porous pore-forming substrate of a controlled thickness with said suspension of a ceramic material;
• d) a step (B) of evaporating said solvent, in order to form a pore former/solid ceramic composite structure (S);
• e) a step (B′) of cutting said composite structure (S) into structure elements (s);
• f) a step (E) of forming an assembly from the two elements (s1) and (s2) obtained in step (B′), wherein said elements are stacked back to back with their dense faces being adjacent;
• g) a step of thermocompression;
• h) a step (C) of debinding;
• and
• i) a step (D) of sintering.