The thermal expansion analyzer is mainly used to determine the thermal expansion coefficient of ceramics, refractory materials and other fixed materials, especially corundum refractory materials, shell and core materials for precision casting.
It provides modern means for factories and technical inspection departments to inspect the quality of ceramics and refractory materials, as well as scientific research and teaching units. The device can automatically control the temperature, record, store, print data, and print the temperature-expansion coefficient curve. All test operations are completed through the computer interface, the operation is simple and easy to learn, and a full set of software is provided.
Due to temperature changes, objects will expand and contract. Its ability to change is represented by the change in length value caused by a unit temperature change under a constant pressure p, that is, the coefficient of thermal expansion.
Each object has a different coefficient of thermal expansion. The unit of thermal expansion coefficient of ordinary metals is 1 degree Celsius.
The coefficient of linear expansion refers to the length of a solid in a specific direction when the temperature changes 1 degree Celsius to its length in a standard laboratory environment of 20.
The thermal expansion coefficient is the linear expansion coefficient α, the surface expansion coefficient β and the volume expansion coefficient γ.
Then, pay attention to the test sample of the thermal expansion analyzer:
1. The best test temperature range: glass transition temperature -30℃~ glass transition temperature + 50℃.
2. The sample has no defects, no bubbles and a smooth surface. It can be polished with sandpaper of more than 400 mesh.
3. For polymer sample expansion mold test, the sample needs to be heat-treated at the glass transition temperature + 30°C for 1 hour, and then slowly cooled to room temperature.
4. For solid film-like samples in stretching mode, the orientation direction of the film needs to be determined for testing.
