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What principles does the thermal expansion coefficient meter actually use?
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The coefficient of thermal expansion is used to determine the expansion and contraction properties of metal materials, ceramics, glass, glazes, refractory materials and other non-metallic materials during heating and baking at high temperature. The reference standard of the instrument: GB / T3810.8-2006 and ISO 10545.8-1995 determination of the linear thermal expansion of ceramic tiles, GB / T16920-1997 determination of the average linear thermal expansion coefficient of glass, GB / T3074 (1). 4-2003 determination of the thermal expansion coefficient of graphite electrodes, GB / T 7320-87 "Test Method for Thermal Expansion of Refractory 幸运彩app下载官网
", JC / T908-2013 Artificial Stone Appendix D. Test Method for Linear Thermal Expansion Coefficient.
The structure of the thermal expansion coefficient meter is composed of a sensor device, a resistance furnace, a trolley, a base, and an electrical control cabinet.
Features of thermal expansion coefficient meter: This product consists of a load sensor device, a resistance furnace, a trolley, a base, and an electrical control box. After the electric furnace heats up, the sample in the furnace expands, and the test rod on the end of the sample produces the same amount of expansion. This expansion amount is accurately measured by the inductive displacement sensor and meter, and displayed by the meter.
Principle of thermal expansion coefficient meter : After the electric furnace heats up, the sample in the furnace expands, and the test rod that is at the end of the sample generates an equivalent amount of displacement (if the thermal deformation of the system is not considered). This displacement is accurately measured by the inductive displacement meter and displayed by the displacement meter. In order to eliminate the influence of the thermal deformation of the system on the test results, the corresponding compensation value should be added to the calculation to be the true expansion value of the sample. 1. One end of the test rod in the sensing device is against the sample, and one end is connected to the core of the inductive displacement meter. The other end of the sample is against the fixed sample baffle. Therefore, the degree of freedom of the sample at this end is limited, so the expansion of the sample will cause the corresponding displacement of the core of the displacement sensor. 2. The sample is fixed in the sample tube, and moving in and out of the furnace is achieved by moving the resistance furnace. In this way, the sample is protected from vibration. The resistance furnace is mounted on a trolley, which can be moved on the base rail. 3. Electrical part. Electric furnace uses resistance wire for heating. Furnace temperature is measured by corresponding thermocouple and temperature controller.