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ISO 21068-1:2024

Current Revision
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
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ISO 21068-1:2024

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

PUBLISH DATE 2024
ISO 21068-1:2024

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).

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