The effect of Fe2Al5 as reducing agent in intermediate steps of 'Al2O3/TiC-Fe composite production process

Khoshhal, Razieh; Soltanieh, M.; Boutorabi, S. M. A.

doi:10.1016/j.ijrmhm.2015.04.006

Cited by 5 publications

(1 citation statement)

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“…and metal phase Fe. [19,20]. It will not only reduce the cost but also obtain better properties than synthesizing ceramic composites by reaction sintering from minerals.…”

Section: Introductionmentioning

confidence: 99%

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Chen

Shi

et al. 2019

Materials

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Fe-Al2O3 composites were prepared by pressureless sintering, using Bayan Obo iron concentrate and bauxite as the main raw materials, activated carbon was added as the reducing agent. The effects of different bauxite additions on the phase composition, microstructures, mechanical properties, and the corrosion-resistance were investigated. The results show that the average grain size of alumina decreased as the bauxite content increased. In addition, bauxite contains TiO2, CaO, and MgO, that can form a liquid phase at high temperature, causing the heat capacity of the micro-zone around the metal phase to be different, which leads to a change of undercooling and further affects the dislocation density of the metal phase. The plastic deformation ability of the metal phase can be improved with the low dislocation density. Fracture mechanism analysis indicated that the metal phase absorbed energy through plastic deformation. The optimum performance of the sample was as follows: the flexural strength was 310 MPa, the hardness 12.14 GPa, the alkali resistance 98.32%, and the acid resistance 95.44%.

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“…and metal phase Fe. [19,20]. It will not only reduce the cost but also obtain better properties than synthesizing ceramic composites by reaction sintering from minerals.…”

Section: Introductionmentioning

confidence: 99%

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Chen

Shi

et al. 2019

Materials

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Influence of Carbon Content on Aluminothermic Reduction of Ilmenite During Hot Pressing

Liu

Chen

Xiao

2019

JOM

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Investigation of the mechanism of Fe₂Al₅ powder into FeAl powder transformation

Khoshhal

Hosseinzadeh

2019

Metal Powder Report

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In the iron aluminide production process from the elementary powders, it is confirmed that Fe2Al5 powder forms at lower temperatures and turns to FeAl at high-temperatures. Though there are some theories about the Fe2Al5 to FeAl transformation mechanism, these assumptions have not been proven in any practice. Therefore, the purpose of this research is to clarify the Fe2Al5 to FeAl transformation mechanism. To achieve this goal, the samples with the ratio of 1:1 of iron and aluminum were heat treated. It was found that Fe2Al5 forms at 700 °C and converts to FeAl at 900 °C. The Fe2Al5 to FeAl transformation mechanism was clarified at the next step. It was shown that the direct transition of Fe2Al5 to FeAl is not possible. Therefore, a third factor should be involved. Iron was predicted as the third factor which helps Fe2Al5 to convert into FeAl. This hypothesis was proved in practice.

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The effect of Fe2Al5 as reducing agent in intermediate steps of 'Al2O3/TiC-Fe composite production process

Cited by 5 publications

References 20 publications

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Influence of Carbon Content on Aluminothermic Reduction of Ilmenite During Hot Pressing

Investigation of the mechanism of Fe₂Al₅ powder into FeAl powder transformation

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The effect of Fe2Al5 as reducing agent in intermediate steps of 'Al2O3/TiC-Fe composite production process

Cited by 5 publications

References 20 publications

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Influence of Carbon Content on Aluminothermic Reduction of Ilmenite During Hot Pressing

Investigation of the mechanism of Fe2Al5 powder into FeAl powder transformation

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Product

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Investigation of the mechanism of Fe₂Al₅ powder into FeAl powder transformation