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PREDSTANDARD
maj 2005
Chemical analysis of nitride bonded silicon carbide refractories
ICS 71.040.40; 81.060.10 Referenčna številka
OSIST prEN 12698:2005(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD
DRAFT
prEN 12698
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2005
ICS
English version
Chemical analysis of nitride bonded silicon carbide refractories
Chemische Analyse von feuerfesten Erzeugnissen aus
nitridgebundenem Silicumcarbid
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 187.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12698:2005: E
worldwide for CEN national Members.
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prEN 12698:2005 (E)
Contents Page
Foreword .3
1 Scope .4
2 Normative references.4
3 Choice of method of determination.4
4 Determination of free aluminium .5
5 Determination of total nitrogen.6
6 Determination of silicon nitride, silicon oxynitride and other phases.16
7 Determination of free silicon .19
8 Determination of free silica .19
9 Determination of carbon .21
10 Direct determination of free carbon content .24
11 Determination of silicon carbide.24
12 Determination of free alumina.25
13 Determination of β’-Sialon.26
Annex A (informative) Determination of free carbon — Hot chromic sulfuric iodic acid
method (9,2,1): Explanation for the evaluation of the different possible detection
methods.29
A.1 Coulometric detection system (Figure A,1) .29
A.2 Infrared absorption detection system .30
A.3 Conductometric detection system.31
An
...