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 Î±-Si3N4, Î²-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 Al2O3â AlN solid solutions (so called Alons), Si3N4â SiO2 solid solutions and Si3N4â 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.
NOTEÂ Â Â Â Â For rationalisation of nitrogen containing phases, the total nitrogen content, analysed in accordance with ENÂ 12698-1 is used.
Текущий статус : PublishedДата публикации : 2021-04
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