Effect of additions of some oxides on the sintering of cr2O3 in air and in a reducing atmosphere
| Autor: | B. G. Alapin, P. P. Krivoruchko, A. I. Portnova, S. V. Lysak, É. V. Degtyareva |
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| Rok vydání: | 1976 |
| Předmět: |
Materials science
Magnesium Reducing atmosphere Metallurgy Composite number Metals and Alloys chemistry.chemical_element Sintering Condensed Matter Physics law.invention chemistry Mechanics of Materials law Materials Chemistry Ceramics and Composites Calcination CHROMIC OXIDE Porosity Solid solution |
| Zdroj: | Soviet Powder Metallurgy and Metal Ceramics. 15:473-476 |
| ISSN: | 1573-9066 0038-5735 |
| DOI: | 10.1007/bf01117790 |
| Popis: | A study was made of the sintering of chromic oxide with TiO2, Al2O3, MgO, and SiO2 additions in air and under reducing conditions at temperatures of 1300–1750°C. Alumina and magnesia do not intensify the densification of Cr2O3 during calcining in air. The most effective under these conditions is an addition consisting of 5 mole % TiO2 and 2–5 mole % of a 35 wt.% Al2O3 + 65 wt.% SiO2 mixture, which enables specimens to be obtained with an apparent porosity of less than 20% and a linear shrinkage of ∼ 12%. The solid-phase sintering of chromic oxide is improved by the addition of TiO2, which forms with Cr2O3 a limited solid solution. A composite addition apparently initiates sintering with the participation of a liquid phase at temperatures above 1500°C. Under reducing conditions, of all the additions investigated only titania has a beneficial effect. |
| Databáze: | OpenAIRE |
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