boron-containing composition, process for preparing it, vitrified composition, use of a boron-containing composition, method of vitrification of a ceramic article, and ceramic article

摘要

COMPOSITION CONTAINING BORO, PROCESS FOR PREPARING THEM, VITRIFIED COMPOSITION, USE OF A COMPOSITION CONTAINING BORO, METHOD OF VITRIFYING CERAMIC ARTICLE, AND CERAMIC ARTICLE. This invention relates to boron-containing compositions for use in vitrified compositions. a boron-containing composition is provided for use in the production of vitrified, the composition of which is obtainable by a process comprising heating to a temperature sufficiently high for calcination to occur, but insufficient to form a homogeneous fusion, a mixture comprising components capable, under heating conditions, of forming the oxides B ~ 2 ~ 0 ~ 3 ~, Si0 ~ 2 ~, Al ~ 2 ~ 0 ~ 3 ~, Na ~ 2 ~ O and optionally CaO in proportions such as: The relative weight percentages of said oxides, based on the total weight of said oxides, are as follows: from 10 to 18% B ~ 2 ~ O ~ 3 ~, from 40 to 65% Si0 ~ 2 ~, from 17 to 32% Al ~ 2 ~ O ~ 3 ~, 4 to 9% Na ~ 2 ~ O and 0 to 10% CaO. Boron-containing compositions according to the present invention may be used in vitrified compositions, suitably frit-free or frit-containing vitrified compositions.