ISO 23071:2021

Refractory products — Determination of reduced species in carbon containing refractories by XRD

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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 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⋅AlN solid solutions (so called Alons), Si₃N₄⋅SiO₂ solid solutions and Si₃N₄⋅Al₂O₃ 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.

General Information

Status : Published

Standard Type: Main

Document No: ISO 23071:2021

Document Year: 2021

Pages: 7

Edition: 1

Section Volume:
ISO/TC 33. Refractories

ICS:
81.080 Refractories

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ISO 23071:2021

ISO 23071:2021

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