CERAMIC MATERIALS, ABRASIVE PARTICLES AND ARTICLES AND METHODS OF OBTAINING AND USING THEREOF Russian patent published in 2009 - IPC C03C3/12 C03C10/00 C04B35/653 

FIELD: chemistry.

SUBSTANCE: amorphous material contains at least 35 wt % of Al₂O₃ whereat the percentage composition is determined from the general weight of amorphous material and at least one of the following metal oxides Y₂O₃, REO, ZrO₂, TiO₂, CaO, Cr₂O₃, MgO or CuO. The total share of As₂O₃, B₂O₃, GeO₂, P₂O₅, SiO₂, TeO₂ and V₂O₅ does not exceeds 10 wt % with all being given in relation to the total mass of the amorphous material. Amorphous material dimensions along the orthogonal axes x, y and z are at least 5 mm. If oxide other than Al₂O₃ is CaO or ZrO₂ the amorphous material contains additionally the metal oxide other than Al₂O₃, CaO or ZrO₂ and in case of amorphous material crystallisation at least part of the said oxide is separate crystalline phase. If the metal oxide is CaO its content is not more than 25 wt % in relation to the total mass of the amorphous material. The method includes obtaining of amorphous particles and their following thermic treatment for glass-ceramics obtaining.

EFFECT: obtaining of abrasive materials with improved mechanical properties by less expensive and more economical way.

18 cl, 65 ex, 12 tbl, 19 dwg