Alkali resistant glass compositions

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 3/087 (2006.01) C03C 13/00 (2006.01)

Patent

CA 2598708

An alkali resistant glass composition having improved durability to withstand highly alkali environments at elevated temperatures, such as curing of cementitious products in an autoclave, is conveniently formed from economical and abundant materials. The glass composition includes increased levels of calcium and iron, and relatively low levels of alkali metals, as compared to many other alkali resistant glass products, and comprises essentially of, by weight, >35% Si2O3, 1-25% CaO, 1-15% Fe2O3, 1-10% R2O, and an amount of Al2O3 such that the ratio of Si2O3:Al2O3 is greater than or equal to 1. Alkali resistance can be improved by forming a passivity layer on the surface of glass articles by treating the articles hydrothermally in a basic environment. Optionally zirconia and/or titania may be added to the composition to further improve alkali resistance.

Cette invention concerne une composition alcalino-résistante dont la longévité accrue lui permet de résister dans des environnements fortement alcalins à haute température cas des opérations de durcissement de produits cimentaires en autoclave et que l'on fabrique facilement à partir de matériaux bon marché et abondants. Comparée à de nombreux autres produits en verre alcalino-résistant, ladite composition vitreuse présente des niveaux accrus de calcium et de fer, des niveaux comparativement faibles de métaux alcalins, et comprend essentiellement, en poids, >35 % Si2O3, 1-25 % CaO, 1-15 % Fe2O3, 1-10 % R2O, et une quantité de Al2O3 telle que le rapport Si2O3:Al2O3 est supérieur ou égal à 1. Il est possible d'accroître l'alcalino-résistance en formant une couche passive sur la surface de l'article en verre par un traitement hydrothermique en milieu basique. On pourra éventuellement ajouter du zircone et/ou de l'anhydride titanique à la composition pour en accroître encore l'alcalino-résistance.

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