DIL L75 VS – Quarz – Thermal expansion – calculated DTA

Quartz Sample – Thermal expansion / quartz transformation / phase transition / calculated DTA

The adhesive being examined has applications in structural bonding, with a particular emphasis on glass sealing in vehicles. This adhesive offers a broad spectrum of mechanical properties, making it versatile for sealing gaps in vehicle battery packs and for various automotive components like quarter lights, modular roof assemblies, sunroof systems, and door glass.

Some of its notable advantages include high thermal conductivity, low thermal resistance, effective vibration damping, and compatibility with all vehicle production processes. The primary objective of the TIM-Tester measurement was to confirm the adhesive’s thermal conductivity.

App. Nr. 02-001-003 DIL L75 VS – Quartz – Thermal expansion – calculated DTA

In the case of α-SiO2, the phase transition occurs around 575°C. The measured absolute delta-L value versus temperature (depicted by the blue curve) represents the standard signal exhibited by a dilatometer. Additionally, the red cal-DTA curve, generated through mathematical evaluation of the set temperature and actual sample temperature, exhibits a peak indicative of the phase transition—reminiscent of a classic Differential Scanning Calorimetry (DSC) or DTA curve. The application of the DTA feature proves invaluable, particularly when the expansion curve alone does not provide a distinct onset point for the phase transition.

Furthermore, the slight deviation of the measured temperature (575.8°C) from the literature value (574°C) offers an opportunity for temperature calibration, contributing to the precision of the dilatometer’s measurements.

Related instruments

DIL L75 PT Vertical

  • Vertical “Zero-Friction” Dilatometer
  • Multi furnace option (up to 3 furnaces)
  • Different furnaces: -263 up to 1000/1600/1750 …2800°C
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