Elastic Modulus Measurement at High Temperatures for Miniature Ceramic Samples Using Laser Micro-Machining and
Zhao Zhang1, Hai Xiao2, Rajendra K Bordia1
1Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA.
Materials (Basel, Switzerland)
|September 28, 2024
Summary
This study presents a novel method for measuring ceramic flexural elastic modulus at high temperatures using laser-cut microbeams. The technique accurately characterizes miniature samples, validating ceramic material properties for advanced applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Ceramic Engineering
Background:
- Accurate measurement of ceramic mechanical properties at high temperatures is crucial for engineering applications.
- Traditional methods may not be suitable for characterizing small, localized regions of bulk ceramics.
- High-temperature characterization of ceramic micro-mechanical properties is essential for performance prediction.
Purpose of the Study:
- To demonstrate a precise method for measuring the flexural elastic modulus of ceramics at an intermediate scale.
- To enable high-temperature characterization of miniature ceramic samples.
- To provide an accurate method for analyzing localized material properties in bulk ceramics.
Main Methods:
- Utilized a picosecond laser for precise microbeam cutting (approx. 100 μm × 300 μm cross-section, ~1 cm length) from bulk ceramics.
- Employed a thermal mechanical analyzer for four-point flexural testing at various temperatures (room temperature, 500 °C, 800 °C, 1100 °C).
- Validated the method by comparing measured elastic moduli of Al2O3 and AlN with literature values.
Main Results:
- The developed method accurately measured the flexural elastic modulus of ceramic microbeams at elevated temperatures.
- Experimental results for high-purity aluminum oxide (Al2O3) and aluminum nitride (AlN) showed less than 5% deviation from reported literature values.
- Demonstrated the feasibility of characterizing localized mechanical properties in bulk ceramics.
Conclusions:
- This paper introduces a new, accurate, and reliable method for determining the high-temperature flexural elastic modulus of miniature ceramic samples.
- The technique allows for the characterization of specific regions of interest within bulk ceramic materials.
- The findings support the use of this method for advanced material analysis and quality control in high-temperature ceramic applications.
Keywords:
aluminaaluminum nitrideflexural elastic modulushigh-temperature ceramicsmicro-machiningpicosecond laserMore Related Videos
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