Dilatometer
A dilatometer is an apparatus being used to measure the linear Dilatation of an object according to the temperature.
Operation
The basic principle can be described in the following way: One places a metal stem on the dilatometer. The flames, placed under this one, heat it and dilate it. This dilation involves the movement of the needle on the graduated dial.
It is also a measuring device used in the field of sciences of materials. In this case, it is about a feeler in contact with the sample (thickness of a few millimetres to a few centimetres), placed in a furnace which can reach temperatures of 2000°C. There exist models making it possible to work in the negative temperatures and under controlled atmosphere, for example under neutral atmosphere.
Applications
The applications of this apparatus are numerous: metal alloys, ceramics, glasses… The dilatometer makes it possible to measure the dilation coefficient alpha of a material. Concretely it is the slope of the curve dilation according to the temperature. One can also measure the temperature of sintering of a ceramics, one observes in this case a strong withdrawal at the temperature of sintering.
See too
Related articles
- Dilation
- Thermal switch
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