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Dilatometry measures the change in size of a sample as a function of temperature. In addition to directly determining the thermal expansion of the sample, the change in size also provides information about phase transitions and physical or chemical changes in the microstructure. These can be identified by the associated changes in density and rate of expansion of the material. Dilatometry is also an extremely useful method for evaluating the sintering behavior of materials, as it records both the shrinkage of a sintered sample and the temperatures required to achieve this change. This analysis allows optimization of workpiece shapes and processing temperatures, improvement of product quality and reduction of costs.
The DIL800L, DIL800 and DIL830 series instruments are classic horizontal push rod dilatometers. They measure the thermal expansion of a specimen placed horizontally in a furnace by scanning its head end with a push rod. As the length of the sample changes, the push rod is displaced horizontally. This displacement is measured in high-resolution by an LVDT sensor or an optical encoder, depending on the instrument series. The length change is recorded together with the sample temperature, which allows the generation of an expansion curve versus temperature. Different furnace types are available for a wide temperature range from below -170°C to 1700°C and a choice of different atmospheres. Only TA dilatometers offer proprietary True Differential technology, which compensates for the expansion of instrument components in real time in a single measurement, significantly improving accuracy and data quality. The extremely fast-cooling furnaces enable unmatched sample throughput. TA Instruments dilatometers are the first choice for laboratories that require the highest accuracy and/or productivity.
Multiple configuration options make TA Dilatometers the right choice for measurements in the ceramics and glass industries at medium to high temperatures, for testing polymers and composites in the cryogenic to medium temperature range, and for metals and other air-sensitive materials in inert gas atmospheres. TA Instruments dilatometers are the first choice for laboratories that require application-relevant accuracy, robustness, and high productivity.
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