Substrate with a stack having thermal properties

A substrate provided with a thin-film multilayer comprising an alternation of n functional layers having reflection properties in the infrared and/or in solar radiation, and (n+1) coatings, where n ≧1, said coatings comprising a layer or a plurality of layers, including at least one made of a dielectric material, so that each functional layer is placed between at least two coatings, wherein, in order to preserve the optical and/or mechanical quality of the multilayer in the case in which the substrate provided with said multilayer is subjected to a heat treatment of the toughening, bending or annealing type, at least one of the functional layers includes a blocker coating consisting of:

• a protection layer comprising a metal selected from the group consisting of Ti, Zr, Al, and Nb, or an alloy comprising at least one of said metals, immediately in contact with said functional layer;
• and
• at least one adhesion layer based on a NiY alloy, where Y is at least one selected from the group consisting of Cr, Ti, Zr, Al, Nb and Hf, immediately in contact with said protection layer and with said dielectric material.