The glass ceramic reference is an opaque material with high strength, high heat tolerance and low thermal expansion. Due to its good mechanical it has various applications such as kitchenware, antenna windows and radomes.
BCR 724, a standard glass ceramic has been measured using Laser flash LFA 1000.
Therefore, a small disc of 1 mm thickness and 1-inch diameter was cut out of a plate of bulk material and coated with graphite for the measurement.
The LFA measures the thermal diffusivity as a direct function of temperature. The specific heat (Cp) data was obtained by a comparative method, measuring a known ceramic standard under the same conditions in a second sample position of the same sample holder. Using these values, the thermal conductivity was calculated out of the product of density, specific heat and thermal diffusivity. The result shows a slightly decreasing thermal diffusivity and conductivity while the specific heat value increases over temperature.
