DIL 820 Series Vertical Dilatometer

The 820 Series from TA Instruments function in a vertical orientation, making it uniquely assembled for the studies in Rate Controlled Sintering (RCS) mode, testing of sintering and the determination of dilatometric parameters of samples otherwise hard to be examined on classic dilatometers with horizontal design.

Offered in two different models - DIL 821 and DIL 822; both the units possess the new optical encoder with 1 nm resolution. When integrated with the True Differential of the DIL 822, the result is simply the best possible sensitivity and CTE accuracy available on the market.

In contrast to horizontal dilatometry, the vertical design does not require the sample to be supported. The specimen stands free on the bottom plate and the pushrod is loaded on its tip.

The vertical configuration is especially ideal for sintering studies as well as for all those samples difficult to be examined using horizontal pushrod dilatometers - for instance, powder samples and samples developing vitreous phases during the test.

Equipped with a linear motor capable of producing a constant force throughout the experiment, the DIL 820 Series allows for the lightest possible force irrespective of the extent of specimen’s dimensional variations.

Specifications

  DIL 821 DIL 822
Sample length 0 to 25 mm
Sample diameter 10 mm 5 mm
Material of sample holder Fused silica, Al2O3
Contact Force 0.01 – 1.0N
Change of length 5 mm
Resolution ΔL °C 1 nm, 0.05 °C
Accuracy in α 0.03 x 10-6 K-1 0.01 x 10-6 K-1
Atmosphere Vacuum, Inert gas, Air (gas unit with massflow controller and vacuum unit included)
Temperature range RT – 1100 °C
RT – 1500 °C
100 – 1700 °C

Applications

The combination of the advanced design and methods of the DIL 820 series makes TA Instrument´s vertical dilatometers the perfect instruments for high sintering rate measurements and experiments with specimens with high shrinkage.

As an example, WinTA software’s latest (True-Rate Controlled Sintering (T-RCS) functionality automatically amends the heating profile to attain a constant sintering rate (shrinkage per time) of a ceramic green body. The true, absolute shrinkage of the sample has to be recorded and deduced in real time. Here, the True Differential system of the DIL 822 and DIL 822HT becomes the ideal solution.

In another instance, the use of an alumina disc under and on top of the sample allows the user to operate experiments up to the sample’s softening point without influencing the measuring system.

A main advantage of the vertical design is it does not require the sample be placed on a support. This prevents friction during the shrinkage/expansion stopping any and all of the probable measurement errors, as well as damages to the measuring systems.

Moreover, powdery, fragile or softening samples can be measured easily as the vertical design and precise force control prevent specimens from sagging or collapsing.

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