The DVD-2800 is a fully automated dilatometer system designed to measure dimensional changes of a specimen brought about by changes in its thermal environment. Linear thermal expansion coefficient, shrinkage attendant to sintering, phase transformations, annealing characteristics and other physical
or chemical changes manifesting themselves in a change of a linear dimension can be precisely determined at temperatures up to 2800°C.Processing parameters can be studied in great detail through duplication of actual thermal cycles and rates. Due to extensive cycle programming, even complex processes can be simulated

DVD-2800 Features
• Temperature control and specimen temperature is determined optically. An exclusive full-range pyrometer coversthe operating range seamlessly from ambient to 2800°C. Optionally, the standard graphite dilatometer tube is made to be interchangeable with alumina or silica tubes for special applications.

• The digital displacement transducer used in the system is an absolute device with no periodic calibration requirements. It is free of short term drift and long term changes, as its accuracy is based on a very stable internal glass grating whose movement is optically monitored.

• The dilatometer head slides up and down on guide rods to expose the specimen holder from the furnace cavity. For mooth operation, the head-lifting mechanism is counter-balanced with constant force springs. When ***ed, sliding hermetic seals close the cavity to provide a protective environment for the specimen. Critical components, such as the seals, the base of the dilatometer head, the solid-state power controller, and the step-down power transformer are water cooled.

The vertical configuration of this device makes it especially suitable for testing ceramic or other powder pressed materials where shrinkage often accompanies heating. Pushrod tracking forces are governed by variable dead weight counterbalancing,and can be reduced to very low values. Optionally, loading can also be applied through additional weights.

Technical Specification