| abstract |
Provided is a functional building material for windows and doors, comprising a transparent glass substrate and a low-emissivity coating formed on one side of the transparent glass substrate, wherein: the low-emissivity coating comprises a lowermost barrier layer, a first dielectric layer, a lower barrier layer, a second dielectric layer, a first low-emissivity protective layer, a low-emissivity layer, a second low-emissivity protective layer, a third dielectric layer, an upper barrier layer, and a fourth dielectric layer, which are sequentially laminated on the transparent glass substrate; the lowermost barrier layer includes one selected from the group consisting of a first metal, a first composite metal, an oxide of the first metal, an oxide of the first composite metal, an oxynitride of the first metal, an oxynitride of the first composite metal, and a combination thereof; the lower barrier layer and the upper barrier layer each includes one selected from the group consisting of a second metal, a second composite metal, a nitride of the second metal, a nitride of the second composite metal, and a combination thereof; and the lowermost barrier layer, the lower barrier layer, and the upper barrier layer each comprises a single layer or multiple layers. |