Glass substrates coated with a stack of thin layers having reflective properties in the infra-red and/or solar ranges

A transparent substrate, comprising a stack of thin layers having at least one layer with properties in the infra-red range, which comprises on a carrier substrate in order:

• a) a first undercoating comprising a dielectric material;
• b) an optional primer metallic coating, the metal thereof being selected from the group consisting of Nb, Ta, Ti, and an alloy of at least two of these metals;
• c) at least one layer having properties in the infra-red range;
• and
• d) a second overcoating, comprising dielectric material;
• wherein in order to prevent modification of properties of the stack when a carrier substrate thereof is submitted to a thermal treatment of bending or tempering;
• i) the first underlying coating comprising dielectric material has at least a first barrier layer for the diffusion of alkaline ions and oxygen;
• and
• ii) the second overcoating comprising dielectric material has at least a second barrier layer for the diffusion of oxygen;
• wherein the first underlying coating and second overcoating are selected from the group consisting of SiOC, SiC, TiC, CrC and TaC.

A transparent substrate, comprising a stack of thin layers having at least one layer with properties in the infra-red range, which comprises on a carrier substrate in order:

• a) a first undercoating comprising a dielectric material;
• b) an optional primer metallic coating, the metal thereof being selected from the group consisting of Nb, Ta, Ti, and an alloy of at least two of these metals;
• c) at least one layer having properties in the infra-red range;
• and
• d) a second overcoating, comprising dielectric material;
• in order to prevent modification of properties of the stack when a carrier substrate thereof is submitted to a thermal treatment of bending or tempering;
• i) the first underlying coating comprising dielectric material has at least a first barrier layer for the diffusion of alkaline ions and oxygen;
• and
• ii) the second overcoating comprising dielectric material has at least a second barrier layer for the diffusion of oxygen;
• wherein the first underlying coating and second overcoating are such that one is selected from the group consisting of silicon nitride, silicon oxide, aluminum nitride and silicon oxynitride;
• and the other is selected from the group consisting of SiOC, SiC, TiC, CrC and TaC.

A transparent substrate, comprising a stack of thin layers having at least one layer with properties in the infra-red range, which comprises on a carrier substrate in order:

• a) a first undercoating comprising a dielectric material;
• b) an optional primer metallic coating, the metal thereof being selected from the group consisting of Nb, Ta, Ti, and an alloy of at least two of these metals;
• c) at least one layer having properties in the infra-red range;
• and
• d) a second overcoating, comprising dielectric material;
• in order to prevent modification of properties of the stack when a carrier substrate thereof is submitted to a thermal treatment of bending or tempering;
• i) the first underlying coating comprising dielectric material has at least a first barrier layer for the diffusion of alkaline ions and oxygen;
• and
• ii) the second overcoating comprising dielectric material has at least a second barrier layer for the diffusion of oxygen;
• wherein the first underlying coating and second overcoating are selected from the group consisting of SiOC, SiC, TiC, CrC and TaC;
• and wherein the thickness of the barrier layer belonging to the second overcoatin, is at least 10 nm.