Heat treatable coated article with dual layer undercoat

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 17/36 (2006.01) B32B 17/06 (2006.01)

Patent

CA 2538089

In certain example embodiments, a multi-layer undercoat may include a layer of or including tin oxide on the glass surface and a layer of silicon nitride thereover. Tin oxide is advantageous in that it is relatively durable, and is a low stress material with excellent adhesion to glass. Moreover, the sputtering rate for tin oxide is several times higher than that of silicon nitride. Thus, problems of high cost (due to slow deposition rate) and durability (due to high compressive stress) can be overcome through the use of tin oxide as a bottom portion of the dual layer overcoat. The coated article may or may not be heat treated in different embodiments of the invention.

L'invention concerne, dans certains modes de réalisation exemplaires, une sous-couche multiple qui comporte une couche d'oxyde d'étain ou qui renferme de l'oxyde d'étain sur la surface vitreuse et, au-dessus de celle-ci, une couche de nitrure de silicium. L'oxyde d'étain est intéressant du fait qu'il est relativement durable, de faible contrainte et d'une excellente adhérence au verre. De plus, la vitesse de pulvérisation de l'oxyde d'étain est plusieurs fois supérieure à celle du nitrure de silicium. Ainsi, les problèmes de coût élevé (du fait du faible taux de dépôt) et de durabilité (du fait d'une contrainte de compression élevée) peuvent être résolus grâce à l'utilisation de l'oxyde d'étain comme partie inférieure de la double couche de finition. Selon les modes de réalisation, l'article revêtu peut, mais pas nécessairement, subir un traitement thermique.

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