| Autor: |
Landa, Ya., Litovskii, E., Glazachev, B., Puchkelevich, N., Klimovich, A. |
| Zdroj: |
Refractories; 1978, Vol. 19 Issue 9/10, p561-565, 5p |
| Abstrakt: |
The advantages of the hot-wire method of determining the thermal conductivity of refractory products lie in the fact that it makes it possible to determine the true thermal conductivity directly in relation to a given temperature of the specimen. This fact distinguishes this method favorably from the methods based on the use of tablets and cylinders in which the thermal conductivity is related to the mean temperatures of the hot and cold sides on the specimen. The hot-wire method gives satisfactory results even when λ is low, i.e., 0.05-0.18 W/ m·deg K [in the standard method (GOST 12170-76) the lower limit in the determination of the thermal conductivity of refractories is 0.18 W/m·deg K]. The method is convenient for determining the thermal conductivity of refractories in granular and powder form. Among the disadvantages of the method are the fact that it cannot be used to determine the thermal conductivity of anisotropic materials, the complexity of the measuring process and the high degree of skill demanded from the operator, and the long duration of the measuring process at a given temperature. The investigations on the experimental device developed at the All-Union Institute of Refractories demonstrated that the hot-wire method can be used for refractories with a low or moderate thermal conductivity [λ<2-2.5 W/m·deg K] over the temperature range 20-900°C with an error of about 10%. The method is a promising one for determining λ also at a high temperature (up to about 1400°C). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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