MELTED ALUMINA-ZIRCONIA CERAMIC GRAINS, ABRASIVE TOOLS AND REFRACTORY PARTS PRODUCED FROM SAID GRAINS

The invention concerns melted alumina-zirconia grains corresponding to the following chemical composition, expressed in mass %: ZiO2 + HfO2 10.60 %; Al2O3 38 to 90 %; SiO2 < 0.8 %; impurities < 1.2 %, characterised in that they have a slightly reduced state such that the grains contain less th...

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Bibliographic Details
Main Authors ALEONARD, BRUNO, PASCAL, ALBERT, ZANOLI, ALAIN, PAUL, BERNARD
Format Patent
LanguageEnglish
French
German
Published 19.05.2004
Edition7
Subjects
ADHESIVES
ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
CONCRETE
DYES
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
GRINDING
INORGANIC CHEMISTRY
LIME, MAGNESIA
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PERFORMING OPERATIONS
POLISHES
POLISHING
REFRACTORIES
SEMICONDUCTOR DEVICES
SLAG
TOOLS FOR GRINDING, BUFFING, OR SHARPENING
TRANSPORTING
TREATMENT OF NATURAL STONE
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Summary:The invention concerns melted alumina-zirconia grains corresponding to the following chemical composition, expressed in mass %: ZiO2 + HfO2 10.60 %; Al2O3 38 to 90 %; SiO2 < 0.8 %; impurities < 1.2 %, characterised in that they have a slightly reduced state such that the grains contain less than 100 ppm of carbon and have: a) a porosity, defined by the number of pores with size greater than 20 mu m, not more than 6 for grains number F24 (European Federation of the Manufacturers of Abrasive Products F standard), 2 for grains number F60 and 1 for grains number F100; and b) a tenacity, such as defined in the description, of at least 2.5 Mpa.m<1/2> after calcination at 900 DEG C for 4 hours. The invention is useful for making abrasive tools and refractory parts.
Bibliography:Application Number: EP19990958273