| Autor: |
Pitak, N., Ansimova, T., Gavrish, A., Zoz, E., Karyakin, L. |
| Zdroj: |
Refractories; 1972, Vol. 13 Issue 5/6, p312-315, 4p |
| Abstrakt: |
During heating in oxidizing atmospheres of mullite-corundum specimens with an addition of nickel nitrate at 500-900°C, NiO is formed, and an increase in temperature from 900 to 1500°C is characterized by the development of nickel spinel, NiAlO, the quantity of which increases with an increase in the content of the Ni(NO) · 6HO, and the firing temperature. The high temperature diffractometric method showed that in the system 3AlO · 2SiO-NiO heating in oxidizing conditions, and commencing at 1000°C, NiO decomposes the mullite with the formation of aluminonickel spinel, whose quantity rapidly increases with further temperature rise. At 1500°C the mullite is preserved in small quantities. The nickel spinel, formed as a result of heating to 1300°C the mullite-corundum refractory containing 25% Ni(NO) · 6HO during firing in the silicon carbide mixture and in the hydrogen atmosphere at 1400°C for 30 min, in the main decomposes with the separation of metallic nickel and corundum. However, x-ray patterns confirm that in these conditions the nickel spinel is not completely decomposed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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