| Autor: |
Pitak, N., Ansimova, T. |
| Zdroj: |
Refractories; 1974, Vol. 15 Issue 1/2, p38-41, 4p |
| Abstrakt: |
In the pyrolysis of natural gas at a maximum temperature of 1500°C the variable redox medium causes the destruction of mullite-corundum refractories as a result of the reduction of the silica and of the SiO of the mullite to silicon monoxide during the pyrolysis and of the partial oxidation of the SiO to SiO during the heating of the packing. The cyclic changes in the gaseous medium result in an appreciable increase in the porosity and volume of the product as a consequence of the weakening of the structure by the cristobalite forming between the grains during the oxidation of the gaseous SiO in the transition from pyrolysis to heating. The presence of a small amount of cristobalite in the exposed zone of the refractory is evidence that during the period of heating some of the silicon monoxide is oxidized to SiO. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink