UNI EN ISO 21068-2 : 2008
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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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
08-28-2024
12-04-2008
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
Describes analytical techniques for the determination of change in mass by thermal treatment at specified temperatures, and methods for the determination of the total carbon content, free carbon, silicon carbide, silicon, total silica and free silica content of silicon-carbide-containing raw materials and refractory products.
| Committee |
CT 700
|
| DocumentType |
Standard
|
| PublisherName |
Ente Nazionale Italiano di Unificazione (UNI)
|
| Status |
Superseded
|
| SupersededBy |
| Standards | Relationship |
| ISO 21068-2:2008 | Identical |
| EN ISO 21068-2:2008 | Identical |
| ISO 10081-1:2003 | Classification of dense shaped refractory products — Part 1: Alumina-silica |
| EN 12698-1:2007 | Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods |
| ISO 9286:1997 | Abrasive grains and crude Chemical analysis of silicon carbide |
| ISO 10081-4:2014 | Classification of dense shaped refractory products — Part 4: Special products |
| ISO 10081-3:2003 | Classification of dense shaped refractory products — Part 3: Basic products containing from 7 % to 50 % residual carbon |
| ISO 1927:1984 | Prepared unshaped refractory materials (dense and insulating) Classification |
| ISO 10060:1993 | Dense, shaped refractory products — Test methods for products containing carbon |
| ISO 21068-1:2008 | Chemical analysis of silicon-carbide-containing raw materials and refractory products — Part 1: General information and sample preparation |
| ISO 5725-2:1994 | Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method |
| ISO 10081-2:2003 | Classification of dense shaped refractory products — Part 2: Basic products containing less than 7 % residual carbon |
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