Name: EN ISO 21068-3:2008
Brand: CEN

Chemical analysis of silicon-carbide-containing raw materials and refractory products - Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents (ISO 21068-3:2008)

Published date

01-08-2008

Publisher

Comite Europeen de Normalisation

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Determination of nitrogen and oxygen
   4.1 General
   4.2 Combined determination of nitrogen and oxygen
       by an analyser with thermal conductivity (CR)
       and infrared absorption (IR) detection
5 Determination of nitrogen calculated as Si[3]N[4]
   5.1 General
   5.2 Acid decomposition - Titration method
   5.3 Acid decomposition - Photometry method
   5.4 Inert-gas fusion - Thermal conductivity method
   5.5 Determination of total nitrogen
6 Determination of free Iron by Inductively Coupled
   Plasma Atomic Emission Spectrometry (ICP-AES)
   6.1 General
   6.2 Copper sulfate method
   6.3 Bromine/methanol method
7 Determination of free aluminium and free magnesium
   7.1 General
   7.2 Acid decomposition - Inductively coupled plasma atomic
       emission spectroscopy (ICP-AES)
   7.3 Acid decomposition - Flame Atomic Absorption
       Spectrometry (FAAS)
   7.4 Hydrogen generating method
8 Analysis of oxides
   8.1 General
   8.2 Wet methods
   8.3 Flame atomic absorption and/or inductively coupled
       plasma atomic emission spectrometer
   8.4 XRF fusion method after ignition of the sample
   8.5 Determination of silicon(IV) oxide, aluminium oxide,
       iron(III) oxide, titanium(IV) oxide, calcium oxide,
       magnesium oxide, sodium oxide, potassium oxide,
       chromium(III) oxide, zirconium oxide, and boron oxide
9 Expression of results
10 Test report
Annex A (informative) Statistical results obtained with
        analysis of refractories containing carbon
        and/or silicon carbide
Bibliography

ISO 21068-3:2008 specifies methods for the determination of total nitrogen and nitrogen calculated as silicon nitride, total oxygen, and free metallic and oxidic components in silicon carbide raw materials and refractory products. It applies only to silicon carbide materials that are not bonded with nitrogen. Nitride-bonded silicon carbide refractories are covered in EN 12698-1.

Committee	CEN/TC 187
DocumentType	Standard
PublisherName	Comite Europeen de Normalisation
Status	Current

Standards	Relationship
UNI EN ISO 21068-3 : 2008	Identical
NS EN ISO 21068-3 : 1ED 2008	Identical
BS EN ISO 21068-3:2008	Identical
I.S. EN ISO 21068-3:2008	Identical
DIN EN ISO 21068-3:2008-12	Identical
PN EN ISO 21068-3 : 2010	Identical
ISO 21068-3:2008	Identical
NF EN ISO 21068-3 : 2008	Identical
NBN EN ISO 21068-3 : 2008	Identical
NEN EN ISO 21068-3 : 2008	Identical
SN EN ISO 21068-3 : 2008	Identical
UNE-EN ISO 21068-3:2008	Identical

ISO 10081-1:2003	Classification of dense shaped refractory products Part 1: Alumina-silica
ISO 21587-1:2007	Chemical analysis of aluminosilicate refractory products (alternative to the X-ray fluorescence method) Part 1: Apparatus, reagents, dissolution and gravimetric silica
ISO 21079-3:2008	Chemical analysis of refractories containing alumina, zirconia, and silica — Refractories containing 5 percent to 45 percent of ZrO2 (alternative to the X-ray fluorescence method) — Part 3: Flame atomic absorption spectrophotometry (FAAS) and inductively coupled plasma emission spectrometry (ICP -AES)
ISO 21587-3:2007	Chemical analysis of aluminosilicate refractory products (alternative to the X-ray fluorescence method) Part 3: Inductively coupled plasma and atomic absorption spectrometry methods
ISO 12677:2011	Chemical analysis of refractory products by X-ray fluorescence (XRF) Fused cast-bead method
EN 12698-1:2007	Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods
ISO 21079-2:2008	Chemical analysis of refractories containing alumina, zirconia, and silica — Refractories containing 5 percent to 45 percent of ZrO2 (alternative to the X-ray fluorescence method) — Part 2: Wet chemical analysis
ISO 21587-2:2007	Chemical analysis of aluminosilicate refractory products (alternative to the X-ray fluorescence method) Part 2: Wet chemical analysis
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 21068-2:2008	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
ISO 21068-1:2008	Chemical analysis of silicon-carbide-containing raw materials and refractory products Part 1: General information and sample preparation
ISO 10081-2:2003	Classification of dense shaped refractory products Part 2: Basic products containing less than 7 % residual carbon
EN 725-3:2007	Advanced technical ceramics - Methods of test for ceramic powders - Part 3: Determination of the oxygen content of non-oxides by thermal extraction with a carrier gas
ISO 26845:2008	Chemical analysis of refractories General requirements for wet chemical analysis, atomic absorption spectrometry (AAS) and inductively coupled plasma atomic emission spectrometry (ICP-AES) methods
ISO 21079-1:2008	Chemical analysis of refractories containing alumina, zirconia and silica — Refractories containing 5 percent to 45 percent of ZrO2 (alternative to the X-ray fluorescence method) — Part 1: Apparatus, reagents and dissolution