EN 12698-1:2007

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

This standard describes the methods for the analysis of all refractory products containing nitride and oxynitride bonded silicon carbide, irrespective of the silicon carbide level. It includes details of sample preparation, general principles of chemical analysis and detailed methods for the determination of carbon, silicon carbide, free aluminium, free silicon, total nitrogen and oxygen.