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
Read sample
ISO 21068-1:2024
83504
Published (Edition 2, 2024)

ISO 21068-1:2024

ISO 21068-1:2024
83504
Language
Format
CHF 42
Convert Swiss francs (CHF) to your currency

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 
  • RSS updates

Got a question?

Check out our Help and Support