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<p>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-Si<sub>3</sub>N<sub>4</sub>, β-Si<sub>3</sub>N<sub>4</sub>, AlN, aluminium metal, Al<sub>4</sub>C<sub>3</sub>, silicon metal, boron carbide and BN are described. The problems encountered with some determinations are highlighted.</p>
<p>Additional reduced species present in some refractories could include Al<sub>2</sub>O<sub>3</sub>⋅AlN solid solutions (so called Alons), Si<sub>3</sub>N<sub>4</sub>⋅SiO<sub>2</sub> solid solutions and Si<sub>3</sub>N<sub>4</sub>⋅Al<sub>2</sub>O<sub>3</sub> 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.</p>
<p>NOTE For rationalisation of nitrogen containing phases, the total nitrogen content, analysed in accordance with EN 12698-1 is used.</p>
Reģistrācijas numurs (WIID)
74488
Darbības sfēra
<p>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-Si<sub>3</sub>N<sub>4</sub>, β-Si<sub>3</sub>N<sub>4</sub>, AlN, aluminium metal, Al<sub>4</sub>C<sub>3</sub>, silicon metal, boron carbide and BN are described. The problems encountered with some determinations are highlighted.</p>
<p>Additional reduced species present in some refractories could include Al<sub>2</sub>O<sub>3</sub>⋅AlN solid solutions (so called Alons), Si<sub>3</sub>N<sub>4</sub>⋅SiO<sub>2</sub> solid solutions and Si<sub>3</sub>N<sub>4</sub>⋅Al<sub>2</sub>O<sub>3</sub> 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.</p>
<p>NOTE For rationalisation of nitrogen containing phases, the total nitrogen content, analysed in accordance with EN 12698-1 is used.</p>
