ČSN EN ISO 21068-1 (726076)

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Refractories

Die Annotation des Normtextes ČSN EN ISO 21068-1 (726076):

This document gives definitions and specifies techniques for the preparation of samples for the chemical analysis of silicon-carbide-containing raw materials and refractory products including:

• a) SiC raw materials;
• b) graphite brick containing silicon carbide;
• c) silicon carbide brick (includes the bricks containing silicon nitride, silicon oxynitride, sialon);
• d) refractories containing carbon and/or silicon carbide mixed with clay;
• e) refractories containing carbon and/or silicon carbide mixed with silica (and fused silica);
• f) refractories containing carbon and/or silicon carbide mixed with high alumina material;
• g) refractories containing carbon and/or silicon carbide mixed with magnesia (and dolomite);
• h) refractories containing carbon and/or silicon carbide mixed with chrome mineral or magnesia-chrome materials;
• i) refractories containing carbon and/or silicon carbide except those described in a) to h) above.

The items of analysis described in ISO 21068-2, ISO 21068-3 and ISO 21068-4 are as follows:

• - loss on drying (LOD);
• - loss on ignition (LOI);
• - total carbon, Ctotal;
• - free carbon, Cfree;
• - silicon carbide, SiC;
• - free silicon (Sifree);
• - free aluminium (Alfree);
• - free magnesium (Mgfree);
• - free iron (Fefree);
• - silicon(IV) dioxide (SiO2);
• - aluminium(III) oxide (Al2O3);
• - iron(III) oxide (Fe2O3);
• - titanium(IV) oxide (TiO2);
• - calcium oxide (CaO);
• - magnesium oxide (MgO);
• - sodium oxide (Na2O);
• - potassium oxide (K2O);
• - chromium(III) oxide (Cr2O3);
• - zirconium(IV) oxide (ZrO2);
• - boron oxide (total boron calculated as B2O3);
• - nitrogen;
• - oxygen;
• - nitrides (undifferentiated: Si3N4, AlN, BN, sialon, oxy-nitrides, etc.);
• - mineralogical phases (XRD-methods)