International Standard
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
Reference number
ISO 21068-1:2024
Edition 2
2024-05
International Standard
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ISO 21068-1:2024
83504
Published (Edition 2, 2024)

ISO 21068-1:2024

ISO 21068-1:2024
83504
Language
Format
CHF 42
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Abstract

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).

General information

  •  : Published
     : 2024-05
    : International Standard published [60.60]
  •  : 2
     : 6
  • ISO/TC 33
    81.080 
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