Automated Thermomechanical Analyzer

What is the Automated Thermomechanical Analyzer?

An automated thermomechanical analyzer loads specimens with a robot, changes probes when required and runs long sequences unattended. It is used where expansion or softening tests are routine and operator time must be spent elsewhere.

Overview

The autosampler moves specimens between a tray and the furnace using a gripper that also aligns them with the probe, so specimen position and load application are repeatable. Sequences can mix methods and probe types, and the software records specimen identification, original length, load, gas and calibration data automatically. Automatic calibration checks with reference materials can be scheduled between batches, which supports laboratories that must demonstrate continuing performance. Practical requirements include accurate specimen length measurement, protection against probe damage when specimens break during penetration or bending tests, and furnace cooling time that dominates cycle time. The system suits incoming inspection of ceramic parts, routine expansion testing of glass and sealing alloys, and high-volume programmes where the same method is applied to many specimens.

How does it work?

A probe rests on the specimen and is connected to a linear variable differential transformer, which converts displacement into an electrical signal with resolution near one nanometre. A furnace programs the temperature while a defined static or oscillating load holds the probe in contact. Depending on the probe and holder fitted, the instrument measures expansion, compression, penetration, tension or three-point bending, and the same displacement channel serves all modes. Coefficient of thermal expansion is calculated from the slope of the expansion curve over a chosen temperature interval, and softening or glass transition temperatures are read from the onset of probe penetration. Calibration uses reference materials of known expansion such as fused silica or aluminium, plus melting point standards for the temperature channel. Probe material, load and contact geometry must be recorded because they influence the measured displacement, and sample preparation must give parallel, flat faces.

What are the key features?

• Robotic specimen loading with repeatable probe alignment
• Sequence control mixing methods and probe types
• Automatic recording of specimen length, load and gas data
• Scheduled calibration checks with reference materials
• Probe damage protection and load release on specimen failure
• Report generation with specification limits and LIMS export

What are the technical specifications?

A typical automated thermomechanical analyzer configuration offers autosampler capacity of 20–40 specimens, temperature range of Ambient–1000 °C, displacement resolution of 5–20 nm, load range of 0.001–5 N, heating rate of 0.1–50 °C/min and measurement modes of Expansion, penetration, compression, bending. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Automated Thermomechanical Analyzer is used in ceramic part incoming inspection, glass and sealing alloy expansion QC, routine polymer expansion testing, frit and glaze expansion screening and high-volume contract testing. Across the wider TMA class, laboratories also deploy it for coefficient of thermal expansion of metals and ceramics, polymer softening and glass transition and electronic substrate and packaging materials.

Which standards and certifications apply?

Relevant standards and methods include ASTM E831, ASTM E1363, ASTM D696, ISO 11359-1, ISO 11359-2 and IEC 61010-1. Certification candidates for this model are CE, IEC 61010-1 safety and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Prepare specimens with parallel, flat and smooth faces, and record the original length precisely, because expansion results are normalized to it. Keep the load low enough to avoid deforming the sample, and allow the probe to settle at the starting temperature before beginning the ramp. Verify the expansion channel with a certified reference such as fused silica or aluminium and check the temperature channel with melting point standards. Beware of systematic artefacts: probe and holder expansion must be subtracted, and soft samples can show apparent shrinkage from creep under load. Keep the furnace and probe clean, replace worn probes, and use the correct purge gas to avoid oxidation or reaction with the specimen. Record mode, load, probe material, gas and calibration data with every curve.

How do I select the right Automated Thermomechanical Analyzer?

Choose the automated configuration when expansions or softening tests are routine and sample numbers justify unattended operation. For occasional runs, manual loading keeps costs lower. In an RFQ, specify autosampler capacity, specimen handling range, mode flexibility, calibration-check scheduling and report format.

How does it compare with other TMA variants?

Decide the measurement mode first, because it dictates the probe and holder: expansion requires a flat-ended probe and often a horizontal or vertical dilatometer configuration, penetration and compression suit polymers and soft materials, tension suits films and fibres, and three-point bending suits rigid bars. Then set the temperature range, since it determines whether the furnace uses quartz, alumina or graphite and whether cooling uses liquid nitrogen or mechanical refrigeration. Displacement resolution matters most for thin films and low-expansion ceramics, where nanometre sensitivity is needed. Load range and control quality decide whether soft, low-modulus samples can be measured without deformation caused by the probe itself. Check the atmosphere and vacuum options, calibration standards supplied, sample preparation tooling and whether the instrument can be upgraded with a humidity generator or an automatic sample changer.