TCT 716によるガラスの熱伝導率の測定Lambda

Determining the Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.thermal conductivity of highly transparent materials such as glass, acrylic or polycarbonate is critical in several high-technology industries. In fields such as optoelectronics, photonics, and advanced display manufacturing, these materials are essential due to their ability of precisely transmitting light while requiring efficient heat dissipation. In addition, understanding thermal properties is critical in architecture, particularly in the development of energy-efficient buildings with large glass facades.

Determining the Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.thermal conductivity of glass is challenging for some measurement techniques. Laser flash analysis (LFA) is one of the most widely used methods for determination of the Thermal DiffusivityThermal diffusivity (a with the unit mm2/s) is a material-specific property for characterizing unsteady heat conduction. This value describes how quickly a material reacts to a change in temperature.thermal diffusivity and Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.thermal conductivity. To perform an LFA measurement, the material must be opaque or made opaque. This may require special coating techniques for highly transparent samples.

The Guarded Heat Flow Meter (GHFM) measurement method in accordance with to ASTM E 1530 by means of the NETZSCH TCT 716 Lambda allows for measurement of such samples without special pretreatment. This new instrument can measure solid and rigid samples with low and medium thermal conductivities between -10 and 300°C.