Results 171 to 180 of about 1,265 (220)

Kinetics of Low-Temperature Aluminothermic Reduction of Iron Tantalate

Inorganic Materials: Applied Research, 2021
The kinetics of low-temperature (900 – 1180 °C) reduction of iron tantalate (98.2 wt % FeTa2O6, 1.8 wt % Ta2O5, particle size < 0.1 mm) by excess aluminum (particle size < 0.14 mm) at the molar ratio Al:FeTa2O6 = 6 was studied. According to differential scanning calorimetry and X-ray powder diffraction, reduction is almost completed at 1180 °C ...
R. I. Gulyaeva, A. M. Klyushnikov, S. A. Petrova, L. Yu. Udoeva   +3 more
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Aluminothermic Reduction of Zirconia

Journal of the European Ceramic Society, 2004
Results are presented for the reaction of aluminium metal with zirconia ceramics under (reducing) sintering conditions. Aluminothermic reduction is a form of self-sustaining high-temperature synthesis (SHS). During reaction the principal phase formed is zirconium monoxide which is shown to have a rock-salt cubic structure and a unit-cell dimension of 0.
Xiaoli Zhe, C.A. Dioka, A. Hendry
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Aluminothermic reduction of tungstic oxide

Journal of the Less Common Metals, 1967
Abstract A method for the preparation of massive tungsten metal by aluminothermic reduction of its trioxide in a closed, magnesia-lined reactor, with provision for the formation of a low melting “Al 2 O 3 -Al 2 S 3 ” slag, has been developed. The presence of a small amount of a mixture of calcium and sulphur was found to be necessary in the charge to
C.K. Gupta, P.K. Jena
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On the aluminothermic reduction of calcium vanadate

Metallurgical Transactions B, 1977
In the aluminothermic reduction of m e t a l oxide, calcium oxide is often used as a flux. The calcium oxide instead of forming an extraneous addition can sometimes be present in chemical combination with the m e t a l oxide. A familiar example is the aluminothermic reduction of calcium tungstate for the production of ferrotungsten. It has been stated1
Omprakash K. Mehra, Chiranjib K. Gupta
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Mechanically activated aluminothermic reduction of titanium dioxide

International Journal of Self-Propagating High-Temperature Synthesis, 2009
Addressed is the effect of ball milling on aluminothermic reduction of TiO2. In 0.5-h milled 3TiO2 + Al mixtures, a two-step reaction was found to yield TiAl and Ti3Al. Upon an increase in the milling time (to 20 h), a one-step reaction yielded TiAl. The activation energy for TiAl formation was 75 kJ mol−1 for 0.5-h milled samples and 33 kJ mol−1 for ...
A. R. Kamali, J. Fahim
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Mathematical Model of Iron Reduction with Aluminothermic Method

Advanced Materials Research, 2014
Utilization of industrial waste in foundry engineering is one of approaches for decrease of production cost price. This technological process may be based on exothermic oxidation-reduction reaction with the resulting formation of iron from dross. Initial charge mixture consists of dispersed aluminum, iron dross and admixtures.
Dmitrii A. Potianikhin, Oleg N. Komarov
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Aluminothermic reduction. An illustrative experiment

Journal of Chemical Education, 1975
The thermite reaction can be made into a very illustrative experiment, involving some typical calculations in high-temperature physical chemistry.
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Sintering of tantalum powder from aluminothermic reduction product

Vacuum, 1990
Abstract This work presents the results of the reactions occuring during sintering of tantalum powder produced by ATR in the temperature range 1500–1900°C. Special emphasis is put on the sintering parameters, linear shrinkage and specific surface area reduction as well as on the analysis of the behavior of the aluminum during sintering, and ...
U.U. Gomes, A.G.P. de Silva, D.G. Pinatti   +2 more
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Preparation of single-phase Cr7C3 by aluminothermic reduction

Journal of Alloys and Compounds, 1993
Abstract Single-phase chromium carbide (Cr 7 C 3 ) has been prepared by the aluminothermic reduction of calcined chromium oxide (Cr 2 O 3 ) in the presence of carbon. Stoichiometric aluminium in the charge has been found to be adequate to form the desired chromium carbide.
A. Biswas, K.U. Nair, D.K. Bose
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Aluminothermic Reduction of Quartz Sand

1982
The exothermic reaction of quartz with aluminum is a promising way to make high purity silicon on a large scale — according to 3 Si02 + 4 Al ➙ 2 Al203 + 3 Si A suitable technical process on this basis requires liquid phases of both oxidic and metallic nature acting as solvents for the reaction products.
J. Dietl, C. Holm, E. Sirtl
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