ISO 17139:2014

Overview

ISO 17139:2014 provides standardized methods for determining the linear thermal expansion properties of ceramic matrix composite materials at temperatures up to 2,300 K. Part of the ISO series on fine ceramics (also known as advanced ceramics or advanced technical ceramics), this standard is relevant to one-dimensional (1D), two-dimensional (2D), and multi-dimensional (nD) composite materials. It outlines the general principles for constructing, calibrating, and operating the measurement apparatus, ensuring consistent and reliable results in determining the thermophysical properties of ceramic composites.

Thermal expansion is a critical factor in the design and application of advanced ceramics, as it affects compatibility with other materials and performance under thermal stress. This standard helps research and industry professionals assess material behavior across a wide range of high-temperature environments.

Key Topics

• Scope of Application: Applicable to 1D, 2D, and nD ceramic matrix composites, covering a broad spectrum of advanced ceramic technologies.
• Measurement Methods:
  • Direct Measurement: Involves the direct observation and recording of length change as temperature varies.
  • Differential Method: Compares the expansion characteristics of a test piece against a reference piece to determine the thermal expansion.
• Equipment Requirements:
  • Specifications for furnace, displacement transducers, sample holders, and temperature measurement devices.
  • Guidelines for calibration, measurement accuracy, and environmental control, including inert atmospheres for high-temperature testing.
• Specimen Preparation: Recommendations on sample dimensions, reference materials, and alignment based on the principal fiber orientation of composites.
• Data Reporting: Requirements for comprehensive reporting in accordance with ISO/IEC 17025, including details on test conditions, calibration methods, and results.

Applications

ISO 17139:2014 is invaluable in multiple industrial and research scenarios involving advanced ceramic composites:

• Material Development: Enables researchers to characterize new ceramic composites for thermal stability and expansion compatibility in high-performance applications.
• Component Design: Provides data for engineers to ensure mechanical integrity and alignment of parts exposed to thermal cycling, particularly in aerospace, automotive, electronics, and energy sectors.
• Quality Assurance: Assists manufacturers in verifying that ceramic components meet strict specifications for linear thermal expansion, reducing the risk of thermal fatigue and failure in service.
• Comparative Testing: Useful for benchmarking new materials against existing standards and for certification of products intended for use in demanding thermal environments.

By applying ISO 17139:2014, organizations can confidently specify, test, and utilize advanced ceramics where stability and reliability at elevated temperatures are mission-critical.

Related Standards

Those implementing ISO 17139:2014 for thermophysical property testing of ceramics may also consider the following standards for comprehensive material characterization and quality assurance:

• ISO/IEC 17025 - General requirements for the competence of testing and calibration laboratories.
• IEC 60584-1 - Thermocouples - Reference tables for temperature measurement.
• ISO 17562 - Test method for linear thermal expansion of monolithic ceramics by the push-rod technique.
• EN 821-1 - Advanced technical ceramics-Monolithic ceramics-Thermo-physical properties-Part 1: Determination of thermal expansion.
• ISO 3611 and ISO 6906 - Dimensional measuring equipment standards for precision in sample measurement.

Leveraging ISO 17139:2014 in conjunction with these related standards ensures a robust and technically sound approach to the evaluation of thermal expansion properties in advanced ceramics.