ISSN:
1573-9139
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions A device is described for measuring the thermal conductivity of refractory-fiber products at temperatures up to 1200°C by a method based on a steady-state radial heat flow. The instrument error does not exceed ±15%. Comparative tests of heat-insulation materials on this device and on apparatus used in earlier experiments showed that reliable results are obtained when the thermocouples are introduced directly into the specimen. Thermometering with thermocouples welded to the axial heater gives greatly understated thermal conductivity values. The temperature dependence of the thermal conductivity was determined over the range 100–1200°C for near-isotropic materials produced from kaolin fiber to densities of 0.2 and 0.35 g/cm3 by a technique developed at the Ukrainian Scientific-Research Institute for Refractories. The sharp increase in the thermal conductivity with the temperature (λ ∼ T3) suggests that radiation is the principal element in the heat exchange.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01284706
