| 摘要 |
The resistance of a refractory oxide/carbon brick depends, in addition to the oxide/carbon mixing ratio and the individual resistance of its components, especially on the type of mixing and fabrication. The novel process is intended to make it possible to mix and bond oxide and carbon in such a way that refractory blocks, especially of large size, of high strength, high density and optimum resistance to gaseous and liquid media can be produced. …<??>Finely disperse, refractory oxide and/or the corresponding hydroxide is first dispersed in molten tar pitch. The oxide/pitch mass is subjected to a coking process at temperatures of up to 1700 DEG C. The resulting sintered product is then processed into grain fractions by comminution and classification. These grain fractions are bonded by means of a mixture of finely disperse oxide and/or hydroxide and pitch to give a green mouldable mass. The mass is pressed to give mouldings and then fired. The carbon contents of the finished brick are between 10 and 50% by weight. To improve, for example, the strength and oxidation resistance of the finished brick, carbon powders or metal powders can be added to the oxide/pitch masses. |
