Thermomechanical Analyser (TMA)
TMA Q400 / Q400EM (Enhanced Mode)
The Q400EM is the industry’s leading research-grade Thermomechanical analyser with unmatched flexibility in operating modes, test probes, and available signals. The Enhanced Mode (EM) allows foradditional transient (stress/strain), dynamic and Modulated TMA™ experiments that provide for more complete viscoelastic materials characterization plus a way to resolve overlapping thermal events (MTMA). The Q400 delivers the same basic performance and reliability as the Q400EM but without the latter’s advanced features. It is ideal for research, quality control, and teaching applications.
A Thermomechanical analyser measures sample dimensional changes under conditions of controlled temperature, time, force, and atmosphere. TA’s engineering experience in design and integration of critical furnace, temperature, dimension measurement, and atmosphere-control components meld with powerful, flexible software to optimize the numerous tests available which the Q Series™ TMA can perform.
The Q400 vertical furnace is designed for high performance, reliability and long life in a wide variety of applications. Customized electronics provide the temperature control and response required for superior baselines, enhanced sensitivity and Modulated TMA™ operation. Software control of the furnace movement ensures operational convenience and simplified sample loading/unloading. The Inconel® 718 Dewar atop the furnace allows continuous operation in cyclic heating/cooling studies using the new optional mechanical cooling accessory (MCA 70).
Linear Variable Differential Transducer
The heart of the Q400 TMA sample measurement system is the precision, moveable-core, linear variable differential transducer (LVDT), which generates an accurate output signal that is directly proportional to a sample dimension change. Its precise and reliable response over a wide temperature range (-150 to 1 000˚C) ensures reproducible TMA results. Its location below the furnace protects it from temperature effects and ensures stable baseline performance.
The easily accessible stage simplifies installation of the available probes (see Modes of Deformation), sample mounting, and thermocouple placement. An integral digital mass flow controller meters the flow of purge gas to the sample area. Precise and responsive temperature control and the well-regulated purge gas result in optimized performance in the standard and MTMA modes of operation. The design benefits also include flexibility in operation and ease of use.
A non-contact motor provides a controlled, friction-free, calibrated force to the sample via a probe or fixture. The force is digitally programmed from 0.001 to 1N, and can be increased manually to 2 N by addition of weights. The motor precisely generates the static, ramped or oscillatory dynamic forces necessary for quality measurements in all deformation modes. Ten individual frequencies are available for optimizing data quality in dynamic TMA experiments in compression, 3-point bending, or tension modes of deformation.