Laser Flash Apparatus (LFA)
The Laser Flash Apparatus is a high-precision, non-destructive technique for measuring thermal diffusivity and calculating thermal conductivity of solid materials. This is essential for understanding heat transport properties in metals, ceramics, and advanced functional materials.
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What is LFA?
LFA uses a short laser pulse applied to one side of the sample. The resulting temperature rise on the opposite surface is monitored over time using a sensitive infrared detector. From this transient response, thermal diffusivity (α) is calculated, and combined with specific heat capacity (Cp) and density (ρ) to determine thermal conductivity (λ) using:
π(π)=πΌ(π)⋅πΆπ(π)⋅π(π)
Measurements are performed in an inert atmosphere to prevent oxidation and ensure accuracy.
Capabilities
- Temperature Range: 300–1200 K
- Accuracy: Thermal diffusivity uncertainty < 5%
- Sample Holders:
- Ø12.7 mm (3 holders)
- 10 × 10 mm (3 holders)
- 8 × 8 mm (1 holder)
- Ø6 mm (1 holder)
- Ideal Sample Thickness: ~2 mm
- Instrument: NETZSCH LFA 457 MicroFlash
Applications
- Heat transport characterization in metals, ceramics, and composites.
- Thermal management studies for electronics and energy devices.
- Material development for high-temperature environments.
- Quality control for thermal barrier coatings.