| Autor: |
Aksel'rod, E., Portnova, A. |
| Zdroj: |
Refractories; 1985, Vol. 26 Issue 11/12, p587-592, 6p |
| Abstrakt: |
Under the selected test regimes, no relationship is found between the thermal shock resistance of dinas brick and its density in the ranges of variation ϱ=2.34-2.40 g/cm, P=15-21%, and α=0-10%. The effect of the porosity of dinas on its thermal shock resistance is determined by the conditions of thermal loading of the specimens. The moderate test regimes (small number of thermal cycles, air cooling of specimens) lead to a parabolic dependence of thermal shock resistance on the porosity. In this case, the minimum thermal shock resistance is shown by the specimens having 17-19% porosity. Clay additions up to 4% do not have a significant effect on the thermal shock resistance of dinas; on the other hand, addition of 10% clay decreases it. Increasing the severity of the test conditions (increasing the number of thermal cycles, water-spray cooling of the specimens) alters the nature of the relationship between thermal shock resistance and porosity: the parabolic relationship changes into a linear relationship. The low-porosity (15-16%) specimens show a decreased thermal shock resistance because of the development of detrimental (destructive) cracks in them. The highest thermal shock resistance is exhibited by the dinas specimens having 19-21% porosity. Increasing the clay content in the specimens up to 4% helps in improving the thermal shock resistance. The identical nature of the porosity dependences of the thermal shock resistance of dinas observed during different methods indicates the reliability of the test results and the applicability of the parameter f/f as an empirical criterion of the thermal shock resistance of refractory materials. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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