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About This Item
Full Description
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).
Document History
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DANSK DS/EN ISO 21068-1
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Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon – Part 1: General information, terminology and sample preparation (ISO 21068-1:2024)- Most Recent
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DANSK DS/EN ISO 21068-1
Chemical analysis of silicon-carbide-containing raw materials and refractory products – Part 1: General information and sample preparation- Historical Version