ISO 23071:2021
ISO 23071:2021 Refractory products – Determination of reduced species in carbon containing refractories by XRD
CDN $131.00
Description
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 α-Si3N4, β-Si3N4, AlN, aluminium metal, Al4C3, 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 Al2O3‚ãÖAlN solid solutions (so called Alons), Si3N4‚ãÖSiO2 solid solutions and Si3N4‚ãÖAl2O3 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.
Edition
1
Published Date
2021-04-08
Status
PUBLISHED
Pages
7
Language
English
Format
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Abstract
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 α-Si3N4, β-Si3N4, AlN, aluminium metal, Al4C3, 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 Al2O3‚ãÖAlN solid solutions (so called Alons), Si3N4‚ãÖSiO2 solid solutions and Si3N4‚ãÖAl2O3 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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