Overview
EN ISO 14544:2025 - Fine ceramics (advanced ceramics, advanced technical ceramics) - specifies standardized procedures for determining the compressive properties of ceramic matrix composites (CMCs) at high temperature. Published by CEN and identical to ISO 14544:2025, this standard covers CMCs with continuous fibre reinforcement (uni‑directional 1D, bi‑directional 2D and multi‑directional xD, x > 2) including carbon/carbon (C/C) materials. Tests are defined for elevated‑temperature environments in air, vacuum and inert gas atmospheres, and distinguish two main testing configurations: compression between platens and compression using grips.
Key topics and technical requirements
- Scope of materials and orientations: Applies to 1D, 2D and xD continuous‑fibre ceramic matrix composites; allows on‑axis and off‑axis testing for 2D/xD laminates.
- Test methods: Detailed procedures for the two cases of compression testing - platen compression and grip (fixture) compression - at elevated temperature.
- Apparatus and set‑up: Requirements for test machines, load trains, gastight test chambers, heating arrangements and temperature measurement/calibration (including controlled‑temperature zones).
- Strain and temperature measurement: Acceptable methods (strain gauges, extensometers), placement, and data acquisition practices for high‑temperature testing.
- Specimen preparation: Machining, dimensions, number of specimens, and measures to avoid buckling or misalignment.
- Test procedure and validity: Displacement rates, mounting, atmosphere control, heating cycles, measurement recording, and acceptance criteria for valid tests.
- Results and calculations: Determination of compressive strength, strain at maximum force, compressive modulus (including linear and non‑linear origin behaviour) and reporting of uncertainties.
- Reporting: Required content for test reports (see Clause 10) and informative annexes for modulus illustration and temperature calibration methods.
Applications and users
EN ISO 14544:2025 is intended for:
- Materials and mechanical test laboratories performing high‑temperature characterization of CMCs.
- R&D and quality teams in aerospace, power generation, automotive, defense and advanced manufacturing using fine ceramics and ceramic matrix composites.
- Designers and engineers who need reliable compressive property data for high‑temperature component design and life‑prediction.
- Certification bodies and suppliers specifying test methods for procurement and material acceptance.
Keywords: EN ISO 14544:2025, fine ceramics, ceramic matrix composites, compressive properties, high temperature testing, continuous fibre reinforcement, carbon/carbon, compressive modulus.
Related standards
- This edition supersedes EN ISO 14544:2016.
- For full list of normative references and related ISO/CEN technical work on fine ceramics, consult Clause 2 and the responsible committees (ISO/TC 206, CEN/TC 184).