Thermal equalising block from aluminium nitride

for improving thermal uniformity of a calibration furnace

- high thermal conductivity (figure next page)

- low density (3,3 g/cm3)

- low specific heat (32,1 J/molK)

- high chemical resistance

- high operating temperature range 0-1100°C (short 1200°C)

- high heat shock resistance up to 180K

With the help of 6 radial insert holes (ø 4 mm) for application of distance pieces can be provided a central positioning of the calibration block in different furnace geometries. The region of the best uniformity of the furnace can be found by means of the central 7 mm hole. The position varies depending on operational temperature and inserts. The block should have an optimal position where the temperature gradients surrounding the sensing elements of thermometers under test are minimal.