NBN ISO 23071:2021

NBN ISO 23071:2021

Refractory products — Determination of reduced species in carbon containing refractories by XRD ISO 23071:2021

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This document describes methods for the determination of mineralogical phases often present as additives or reaction products in carbon containing or graphitic refractory products by X-ray Diffraction (XRD) using a Bragg-Brentano diffractometer. It includes details of sample preparation and general principles for qualitative and quantitative analysis of mineralogical phase composition. Quantitative determination of a-Si3 N4 , ß-Si3 N4 , AlN, aluminium metal, Al4 C3 , silicon metal, boron carbide and BN are described. The problems encountered with some determinations are highlighted. Additional reduced species present in some refractories could include Al2 O3 ·AlN solid solutions (so called Alons), Si3 N4 ·SiO2 solid solutions and Si3 N4 ·Al2 O3 solid solutions (Sialons). The presence of some of these solid solution components will cause problems with both identification and quantification as they are not well-defined structures. NOTE For rationalisation of nitrogen containing phases, the total nitrogen content, analysed in accordance with EN 12698-1 is used.
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Additional Info

Author Bureau de Normalisation Belge (NBN)
Published by NBN
Document type Standard
ICS 81.080 : Refractories
Document history No
Keyword ISO 23071, ISO 23071:2021