ISO 21068-4:2024

Current Revision
Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 4: XRD methods

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ISO 21068-4:2024

This document describes methods for the determination of mineralogical phases typically apparent in nitride and oxy-nitride bonded silicon carbide refractory products using a Bragg-Brentano diffractometer.

It includes details of sample preparations and general principles for qualitative and quantitative analyses of mineralogical phase composition. Quantitative determination of -Si3N4, -Si3N4, Si2ON2, AlN, and ’- SiAlON are described.

For quantitative determination of -Si3N4, -Si3N4, Si2ON2, AlN and ’-SiAlON refinement procedures based on the total nitrogen content of the sample are described.

NOTE ISO 21068-3 is used for the analysis of the total nitrogen content of the sample.

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