UNI EN 12698-1 : 2007
Current
The latest, up-to-date edition.
CHEMICAL ANALYSIS OF NITRIDE BONDED SILICON CARBIDE REFRACTORIES - PART 1: CHEMICAL METHODS
08-28-2007
Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 Methods for determination
5 Sampling
6 Determination of free aluminium
6.1 Principle
6.2 Reagents
6.3 Apparatus
6.4 Sample preparation
6.5 Procedure
6.6 Calculation and expression of results
7 Determination of total nitrogen
7.1 General
7.2 Determination of total nitrogen by carrier gas
fusion (CGF)
7.3 Determination of total nitrogen content by fusion
decomposition
7.4 Determination of total nitrogen content by Kjeldahl
distillation
7.5 Determination of total nitrogen by microwave digestion
8 Determination of free silicon
9 Determination of free silica
9.1 Principle
9.2 Reagents
9.3 Apparatus
9.4 Sample preparation
9.5 Procedure
9.6 Determination
9.7 Calculation and expression of SiO[2] content
9.8 Precision
10 Determination of carbon
10.1 Determination of the total carbon, C[t]
10.2 Determination of free carbon, C[free]
11 Calculation of silicon carbide content
12 Determination of free alumina (Al[2]O[3])
12.1 Principle
12.2 Reagents
12.3 Apparatus
12.4 Procedure
12.5 Calculation and expression of results
12.6 Precision
Annex A (informative) Determination of free carbon using
the hot chromic sulfuric iodic acid method (10.2.1):
Explanation for the evaluation of the different
possible detection methods
A.1 Coulometric detection system
A.2 Infrared absorption detection system
A.3 Conductometric detection system
Bibliography
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