THIN CERAMIC ARTICLES OBTAINED FUSING AND CASTING IN A MOLD A COMPOSITION OF THE SYSTEM AL2O-ZRO2-SIO2-K2O WHICH HAVE GOOD MECHANICAL STRENGTH AND ABRASION RESISTANCE PROPERTIES

摘要

The invention relates to ceramic articles. It relates to an article made of ceramic material produced by fusing and casting in a mold a composition based on alumina, zirconia, silica and an alkali metal oxide, said article consisting of crystalline corundum and zirconia phases and of a vitreous phase, said zirconia being substantially in monoclinic form from the core to the skin of said article, and having, in at least one of its parts, a thickness lower than or equal to 30 mm and being intended for an application where mechanical strength and/or abrasion resistance are of primary importance, said composition consisting essentially, in % by weight based on the oxides, of: -Al2O3 40-75 -ZrO2 20-55 -SiO2 5-20 -Na2O 0-2.7 -K2O 0.15-4.25 -Fe2O3 + TiO2 + CaO + MgO 0-2, - with the condition that the weight ratio IMAGE is between 0.07 and 0.14 inclusive. Application as micronizer disc, pump wear component and antiabrasion slab.