Overview
ISO 17172:2014 specifies a standardized test method for determining the compaction properties of ceramic powders (fine ceramics / advanced ceramics) when subjected to uniaxial compressive loading in a confining die. The method measures the apparent density of granulated or ungranulated powders after pressing (single-action or double-action) and ejection, and-when run at several pressures-produces a compaction curve (apparent density vs. compaction pressure).
Keywords: ISO 17172:2014, compaction properties, ceramic powders, fine ceramics, compaction curve, uniaxial compressive loading.
Key topics and technical requirements
- Principle: Uniaxial compaction in a confining die by double-action (mode 1) or single-action (mode 2) pressing; apparent density calculated as mass/volume.
- Apparatus:
- Cylindrical die made of hardened steel or tungsten carbide with punches; ejection cone (~5 mm) to reduce spring-back.
- Press with force precision ±2%.
- Balance (resolution ±0.001 g) and micrometer (resolution ±0.01 mm).
- Specimen geometry:
- Mode 1: diameter 10–26 mm, height/diameter ratio 0.3–0.5.
- Mode 2: diameter 10–32 mm, height/diameter ratio 0.15–0.25.
- Sampling and pre-treatment:
- Test powders as received or, if required, dry at (110 ± 5) °C for at least 24 h; record any pre-treatment.
- Lubrication options and effects must be recorded (die-wall coating or powder lubricant, 0.1–3.0 wt% recommended for powder lubricants).
- Procedure:
- Press three compacts per pressure; maintain test pressure for ≥10 s; record punch displacement speed or force-increase rate.
- Measure mass and dimensions 10–100 s after ejection to account for spring-back.
- Compaction pressures: Typical test points include 25, 50, 100 and 200 MPa; single-pressure testing uses one of these values.
- Results and reporting:
- Apparent density reported to 0.01 g/cm3; average of three compacts per pressure.
- Test report must follow ISO/IEC 17025 provisions and include details on powder identification, lubrication, press/die, pressing mode, pressures, speeds, dimensions, and the compaction curve.
Applications and users
- Quality control and incoming inspection for powder manufacturers.
- Process development for ceramic pressing and sintering (press parameter optimization).
- R&D teams formulating powder mixes and lubricants to achieve target green densities.
- Production engineers designing dies, presses, and ejection systems.
- Laboratories seeking accredited test methods for advanced technical ceramics.
Related standards
- ISO/IEC 17025 (laboratory competence and reporting)
- EN 725-10 and national standards (listed in ISO 17172 bibliography) for related compaction test methods.
ISO 17172:2014 provides reproducible, comparable data (compaction curve, apparent density, spring-back behaviour) essential for optimizing powder handling, pressing conditions and achieving consistent green body quality in advanced ceramics manufacturing.