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The Hot Disk method is used for determining thermal
transport properties of materials such as metals, alloys, ceramics,
composites, minerals, plastics, paper, fabrics, powders, high viscosity
fluids, building materials, biomaterials and multi-layered materials.
Features of Hot Disk
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Measure Thermal Conductivity, Thermal Diffusivity
& Heat Capacity
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Study materials with thermal conductivities from
0.005 to 500 W/mK
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Covers a temperature range of 30 to 1000K
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Based on a patented Transient Plan Source (TPS)
technique
Variety of operation modes
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Basic Method - The sensor is sandwiched
between two samples. This method also features a single sided option
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Thin Film Method - A special extremely
sensitive sensor is sandwiched between two pieces of the film (10-500 mm)
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Slab Method - For very conducting materials
(>10W/mK such as SiC, Cu etc.)
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Anistropic Method - Measures the anisotropic
thermal conductivity and diffusivity of a uni-axial sample
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Cp Determination - Measure heat capacity of
solid samples
Advantages of Hot Disk include:
- Fast - direct measurement of heat propagation generated by
sensor into material. No need to wait for a temperature gradient to
form across the sample
- Minimal sample preparation. Only requirement is two fairly
flat surfaces facing the sensor
- Only data stemming from heat propagation in the sample material
are used for calculation - Removes errors associated with sensor
cladding or small air pockets between sensor and sample
- Not affected by contact resistance - In static methods,
resistance builds up between the thermocouple and sample surface
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