DANSK DS/ISO 21068-1 PDF

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).