ISO 17947:2014

Overview

ISO 17947:2014 - "Fine ceramics (advanced ceramics, advanced technical ceramics) - Methods for chemical analysis of fine silicon nitride powders" defines standardized chemical analysis procedures for fine silicon nitride (Si3N4) powders used as raw materials in fine ceramics. The standard specifies how to prepare test samples, perform blank tests, and determine the composition of major, minor and trace elements including total silicon, total nitrogen, aluminium, iron, calcium, oxygen, carbon, fluorine, and chlorine.

Key topics and technical requirements

• Analytes and concentration ranges: T. Si (30–70 %), T. N (30–45 %), Al/Fe (0.001–0.6 %), Ca (0.001–0.03 %), O (0.05–5 %), C (0.01–6 %), F/Cl (0.001–0.2 %).
• Sample preparation: Sampling and sample preparation follow ISO 8656‑1; drying example given (about 10 g at 110 °C ±5 °C for 2 h, then desiccation).
• Analytical methods: Multiple accepted analytical routes are specified, including:
  • Total silicon: fusion-dehydration/insolubilization separation with gravimetry or ICP‑OES; XRF using fused cast‑bead.
  • Total nitrogen: acid pressure decomposition + distillation/titration; inert gas fusion with thermal conductivity detection; fusion with ammonia separation and titration.
  • Aluminium, iron, calcium: wet-chemical determination with calibration and blank controls.
  • Oxygen and carbon: dedicated methods including combustion/IR and various furnace + detection techniques.
  • Fluorine and chlorine: procedures with specified reagents, apparatus, calibration and blank tests.
• Quality controls: Blank tests, calibration curves, reporting rules and minimum number of analyses are included to ensure reproducibility and comparability.
• Instrumentation referenced: ICP‑OES, XRF, combustion analyzers, inert gas fusion and titration systems.

Applications and users

ISO 17947:2014 is used for:

• Quality control of silicon nitride powder suppliers and ceramic manufacturers.
• Incoming raw-material inspection and batch certification.
• R&D and materials development in advanced ceramics and technical ceramics.
• Failure analysis and process optimisation where accurate chemical composition (Si/N balance, oxygen or carbon contamination, trace metals) affects sintering, microstructure and mechanical properties.

Typical users: materials scientists, analytical laboratories (metals/ceramics testing labs), powder manufacturers, ceramic component producers and quality assurance teams.

Related standards

ISO 17947:2014 was developed from JIS R 1603 and references standards such as ISO 8656‑1 (sampling), ISO 26845 (general analytical requirements), ISO 2828 (fluorine methods), and ISO 21068 parts for related silicon‑carbide analyses. It also aligns with existing CEN and ASTM practice (CEN ENV 14226, ASTM C1494).

Using ISO 17947 ensures consistent, traceable chemical analysis of fine silicon nitride powders - critical for reliable performance of advanced ceramic components.