Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Conclusions 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.
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