| Autor: |
Gulyga, D., Volivakhin, V., Gol'dfarb, E., Gres, L. |
| Zdroj: |
Refractories; 1972, Vol. 13 Issue 5/6, p294-299, 6p |
| Abstrakt: |
The structure of kaolin brick in the high-temperature zone of the stove after 6.7-7.2 years service at subcupola temperatures of 1300°C underwent substantive external and structural changes. In the structure of the stove made from high-alumina brick VGO-62 after six years service we detected substantially less change. In the kaolin brick of the upper rows of the checker three clearly defined zones are formed: working (slag), impregnated with alkalis, the transition zone (porcelain-type), and the least-changed zone. During the service of high-alumina refractories mullite crystallizes, which confirms the results of work carried out previously. Owing to the creep of kaolin and high-alumina refractories 4-5% shrinkage of the brick occurs in the upper rows of the checker, and at a depth of 2.5-6.0 m - 1.5-2.0%. The height of the checker diminishes under these conditions by 0.8-1.0 m. The densification of the structure of the upper rows of the checker corresponds to a reduction in porosity and an increase in the density of the brick. The temperature of initial deformation under load of 2 kg/cm of the slagged kaolin refractories taken from the upper rows of the checker diminishes by 150-200°C, and in the lower layers of the checker it does not alter. This factor for high-alumina refractories in service increases by 160-190°C. In the high-temperature zone of the stoves it is desirable to test dense, high-alumina refractories containing 72-75% AlO. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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