BS-EN-12698-1-2007.pdf
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1、BRITISH STANDARD BS EN 12698-1:2007 Chemical analysis of nitride bonded silicon carbide refractories Part 1: Chemical methods The European Standard EN 12698-1:2007 has the status of a British Standard ICS 71.040.40 ? BS EN 12698-1:2007 This British Standard was published under the authority of the S
2、tandards Policy and Strategy Committee on 30 April 2007 BSI 2007 ISBN 978 0 580 50633 8 National foreword This British Standard was published by BSI. It is the UK implementation of EN 12698-1:2007. The UK participation in its preparation was entrusted to Technical Committee RPI/1, Refractory product
3、s and materials. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot co
4、nfer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12698-1 March 2007 ICS 71.040.40 English Version Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods Analyse ch
5、imique des produits rfractaires contenant du carbure de silicium liaison nitrure - Partie 1: Mthodes chimiques Chemische Analyse von feuerfesten Erzeugnissen aus nitridgebundenem Siliciumcarbid - Teil 1: Chemische Verfahren This European Standard was approved by CEN on 15 February 2007. CEN members
6、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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application t
7、o the CEN Management Centre or to any CEN member. This European Standard exists 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 CEN Management Centre has the s
8、ame status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
9、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means res
10、erved worldwide for CEN national Members. Ref. No. EN 12698-1:2007: E EN 12698-1:2007 (E) 2 Contents Page Foreword .3 1 Scope4 2 Normative references4 3 Terms and Definitions.4 4 Methods for determination .4 5 Sampling.5 6 Determination of free aluminium .5 6.1 Principle5 6.2 Reagents.6 6.3 Apparatu
11、s.6 6.4 Sample preparation.6 6.5 Procedure.6 6.6 Calculation and expression of results.6 7 Determination of total nitrogen7 7.1 General .7 7.2 Determination of total nitrogen by carrier gas fusion (CGF) 7 7.3 Determination of total nitrogen content by fusion decomposition10 7.4 Determination of tota
12、l nitrogen content by Kjeldahl distillation 14 7.5 Determination of total nitrogen by microwave digestion16 8 Determination of free silicon18 9 Determination of free silica 18 9.1 Principle18 9.2 Reagents.18 9.3 Apparatus.19 9.4 Sample preparation.19 9.5 Procedure.19 9.6 Determination.21 9.7 Calcula
13、tion and expression of SiO2 content.21 9.8 Precision.21 10 Determination of carbon.21 10.1 Determination of the total carbon, Ct21 10.2 Determination of free carbon, Cfree21 11 Calculation of silicon carbide content.25 12 Determination of free alumina (Al2O3) .25 12.1 Principle25 12.2 Reagents.25 12
14、.3 Apparatus.26 12.4 Procedure.26 12.5 Calculation and expression of results.26 12.6 Precision.26 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 methods27 A.1 Coulometric
15、 detection system.27 A.2 Infrared absorption detection system.29 A.3 Conductometric detection system.30 Bibliography32 EN 12698-1:2007 (E) 3 Foreword This document (EN 12698-1:2007) has been prepared by Technical Committee CEN/TC 187 “Refractory products and materials”, the secretariat of which is h
16、eld by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2007, and conflicting national standards shall be withdrawn at the latest by September 2007. According to the CEN/CENELEC Inte
17、rnal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Ma
18、lta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12698-1:2007 (E) 4 1 Scope This standard describes the methods for the analysis of all refractory products containing nitride and oxynitride bonded silicon carbide, irrespective
19、 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. 2 Normative references The following referenced documents
20、are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12475-4:1998, Classification of dense shaped refractory products Part:4 Special p
21、roducts EN 12698-2, Chemical analysis of nitride bonded silicon carbide refractories Part 2: XRD methods prEN ISO 21068, Chemical analysis of silicon carbide containing raw materials and refractory products ISO 836:2001, Terminology for refractories ISO 3310-1, Test sieves Technical requirements and
22、 testing Part 1: Test sieves of metal wire cloth ISO 5022, Shaped refractory products Sampling and acceptance testing ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions ISO 8656-1, Refractory products Sampling of raw materials
23、and unshaped products Part 1: Sampling scheme 3 Terms and Definitions For the purposes of this document the terms and definitions given in ISO 836:2001, EN 12475-4:1998 and the following apply. 3.1 nitride and oxynitride bonded silicon carbide refractories refractory products predominantly consistin
24、g of silicon carbide with minor amounts of nitride phases as a matrix component NOTE In general, metallic silicon is used as precursor material which undergoes a phase transformation in an oxygen-free nitrogen atmosphere. 4 Methods for determination A list of methods and the relevant European Standa
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