UNI EN ISO 21068-2 : 2008
Current
The latest, up-to-date edition.
CHEMICAL ANALYSIS OF SILICON-CARBIDE- CONTAINING RAW MATERIALS AND REFRACTORY PRODUCTS - PART 2: DETERMINATION OF LOSS ON IGNITION, TOTAL CARBON, FREE CARBON AND SILICON CARBIDE, TOTAL AND FREE SILICA AND TOTAL AND FREE SILICON
04-12-2008
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Determination of change in mass
4.1 General
4.2 Determination of the loss on drying at
250 degrees C (LOD[250]) gravimetric method
4.3 Determination of the loss on calcination in
argon (LOI[Ar])
4.4 Determination of the change in mass by heat
pretreatment in air
4.5 Determination of the change in mass at
750 degrees C (LOI[750])
4.6 Determination of loss on ignition at
850 degrees C (LOI[850])
4.7 Determination of loss on ignition at
1050 degrees C (LOI[1050])
5 Determination of the total carbon content
5.1 General
5.2 Combustion techniques
5.3 Detection techniques
5.4 Detection methods
6 Determination of free carbon content
6.1 General
6.2 Sample decomposition by combustion
6.3 Detection techniques
6.4 Direct detection methods
6.5 Indirect detection methods
6.6 Direct determination of free carbon
by wet oxidation
7 Determination of silicon carbide content, SiC
7.1 General
7.2 Determination of silicon carbide, SiC,
by indirect quantitative method
7.3 Determination of silicon carbide, SiC, by
direct quantitative method
7.4 Determination of silicon carbide SiC by
ignition method at 750 degrees C
7.5 Determination of silicon carbide, SiC,
by chemical method
8 Determination of total silicon content via silica
8.1 Principle
8.2 Reagents
8.3 Apparatus
8.4 Procedure
8.5 Blank test
8.6 Calculation
9 Determination of free silicon content
9.1 Principle
9.2 Pretreatment with hydrochloric acid
9.3 Silicon determination by hydrogen evolution
9.4 Silicon determination by silver displacement
10 Determination of silica content, SiO[2]
10.1 General
10.2 Determination of free and/or combined
silica content, SiO[2]
10.3 Determination of free silica, SiO[2]
10.4 Determination of surface silicon dioxide,
SiO[2]
11 Expression of results
12 Test report
Annex A (informative) - Examples of CRMs for
calibration of carbon analyser
Bibliography
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