External users: registration to be carried out only through I-STEM portal
Additional information about sample and analysis details should be filled in the pdf form provided in the I-STEM portal under “DOWNLOAD CSRF”
Internal users (IITB): registration to be carried out only through DRONA portal
Additional information about sample and analysis details should be filled in the pdf form provided here.
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Category
- Material Characterization » Thermal Characterisation
Booking Details
Facility Management Team and Location
Facility Features, Working Principle and Specifications
Facility Description
The LFA 467 HT HyperFlash is a high‑temperature light flash apparatus (laser flash analyzer) used in advanced thermal property testing — specifically to measure thermal diffusivity, thermal conductivity, and specific heat of materials over a very wide temperature range.
Measurement Principle
Thermal Conductivity is the measure of a materials ability to conduct heat. While different techniques (steady
state, transient) are available for this measurement, the difficulty lies is the estimation of heat flow through the
sample. This is especially challenging at high temperatures where radiative heat losses can be significant. The
solution to this problem lies is a rapid measurement where an intense heat pulse is applied to one end of the
sample and accompanying temperature rise is sensed at the other end. In the above figure, the sample assembly
and the typical measurement profile is shown.
The energy source is in this case a Xenon flash lamp hence this instrument is known as the Light Flash
Apparatus (LFA). An IR detector is used to detect the temperature rise at the rear face and the measured time,
sample geometry and a correction factor utilized to calculate the thermal diffusivity (α). The instrument is also
capable of measuring the specific heat capacity (CP) by a comparison of the heat flow of a standard reference
material. The thermal conductivity (α) is calculated from the relation κ(T) = α(T). CP(T). ρ(T) where ρ is the
density.
- Temperature range: Room Temperature to 1000 degree C
- Thermal Diffusivity Range: 0.01 mm2/s – 2000 mm2/s
- Thermal Conductivity Range: 0.1 W/mK – 4000 W/mK
- Accuracy: Thermal diffusivity: ± 3%, Specific heat: ± 5%
Sample Preparation, User Instructions and Precautionary Measures
Sample Requirements and Material Restrictions
(LFA 467 HT HyperFlash)
- Sample Dimensions
Users must strictly follow the designated sample dimensions specified for different types of bulk materials (e.g., metals, ceramics, polymers, composites). Samples shall be flat, plane-parallel, and 10mm or 12.7 mm diameter and thickness range of 1.5mm-2.5mm precisely. - Sample Density Information
Users are required to provide the density of the sample material . Accurate density values are essential for the correct determination of specific heat capacity and thermal conductivity. - Material Thermal Stability
To safeguard the instrument from damage, it is mandatory that the sample material does not decompose, melt, soften, or undergo any uncontrolled phase change within the selected measurement temperature range. Materials showing degradation, excessive outgassing, or structural collapse are not permitted for measurement.
- The above-mentioned rates are per slot basis. The charges may be revised as and when required.
- Please note that the above charges are exclusive of GST @18% at the moment and shall be charged extra for external users.
- Facility is available for the examination only, and the sample preparation is not under scope of this facility usage. It is solely the user's responsibility to come up with a well-prepared sample(s).
- Data Analysis is also not under scope of the facility usage and hence, the analysis is the responsibility of the end user.
- t is mandatory for the user to declare in advance whether the sample material is toxic, poisonous, hazardous, or capable of releasing harmful fumes at any stage of the measurement. Materials posing health, safety, or environmental risks shall not be measured without prior approval and appropriate safety controls. Failure to declare hazardous material properties may result in denial of access to the instrument and possible disciplinary action.
- Kindly carry a blank DVD/CD for the data collection
- Samples are coated with graphite spray. If your samples requires special care/ handling please mention it in advance.
Charges for Analytical Services in Different Categories
Charges are per slot (without GST in Rupees)
.No. | Category | Charge ratio. | GST @ 18% | Room Temperature | RT-500º | RT-1000º |
1. | IITB (TAs) | X/2 | No GST | 400 | 500 | 1000 |
2. | IITB Students | X | No GST | 800 | 1000 | 2000 |
3. | IITB-Monash Students | X | + GST | 800 | 1000 | 2000 |
4. | Academic Institutes | 2X | + GST | 1600 | 2000 | 4000 |
5. | National Labs | 5X | + GST | 4000 | 5000 | 10000 |
6. | Sine (letter from SINE reqd.) | 5X | + GST | 4000 | 5000 | 10000 |
7. | Research Park (MSME) (letter from RP reqd.) | 5X | + GST | 4000 | 5000 | 10000 |
8. | Research Park (Big Industry partners) (letter from RP reqd.) and MSME not associated with RP (appropriate certificate required) | 7.5X | + GST | 6000 | 7500 | 15000 |
9. | Industries | 10X | + GST | 8000 | 10000 | 20000 |
*Additional charges for more temperature points, temperature steps can be user defined
- Charges per slot Each slot can have up to 3 (max) samples for thermal conductivity and 4(max) samples for thermal Diffusivity measurement
- RT-500°C (standard) : Six temperature points (RT, 100°C,200°C,300°C,400°C,500°C)
- RT-1000°C (standard): Eleven temperature points (RT to 1000°C in intervals of 100°C)
- Additional temperature step : INR 100(per point)
Applications
- Materials Science/Metallurgy
- Chemistry
- Chemical Science
- Corrosion
- Polymer Science
- Energy Science/Engg.
- Biological and life sciences
- Semiconductors
- Civil and Earth Sciences
- Nanotechnology
- Ceramics
Pharmaceuticals