Dilatometry

Dilatometry is a powerful analytical technique to determine the dimensional changes in a material as a function of temperature.

In a dilatometry experiment, a sample is placed into a sample holder with one end brought into contact with a push-rod. The sample and holder are then enclosed within a furnace where the sample is subjected to a prescribed temperature program of heating, cooling, or isothermal conditions. During the experiment, the linear dimensional change (expansion or contraction) of the sample is measured by a highly accurate displacement sensing system.

Dilatometry can be used to test a wide range of materials including ceramics, glasses, and metals. It provides measurements of a wide variety of properties including linear thermal expansion, coefficient of thermal expansion, softening point, and glass transition temperature.

EAG Laboratories performs thermal expansion analysis using a Bahr DIL802 True Differential Dilatometer.

Ideal Uses

Determination of:

  • Linear thermal expansion
  • Coefficient of Thermal Expansion (CTE)
  • Softening point (SP)
  • Glass Transition Temperature (Tg)
Technical Specifications
  • Sample length: 10, 25 or 50 mm
  • Maximum sample diameter: 7 mm
  • Maximum change of length: 4 mm
  • Length resolution: 10 nm
  • Temperature resolution: 0.05°C
  • CTE accuracy: 0.01 x 10-6 K-1
  • Sample holder: Fused silica
  • Atmosphere: air
  • Temperature range: 100 – 1000°C
  • Maximum heating rate: 100°C/min
Strengths
  • Programmable temperature: heating and cooling ramps, isothermal steps
  • High CTE accuracy (0.01 x 10-6 K-1)
Limitations
  • Sample size range: sample length must be 10, 25 or 50 mm; maximum sample diameter is 7 mm
  • Atmosphere: system can only be operated in air

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