ISO 21068-4:2024

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

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 a-Si₃N₄, ?-Si₃N₄, Si₂ON₂, AlN, and ?’-?SiAlON are described.

For quantitative determination of a-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.

Edition	2024
Standard Part No	4
Published Date	2024
Published By	International Standardization Organisation
Page Count	11