Abstract
This study provides a novel method to prepare metal–ceramic composites from magnetically selected iron ore using microwave heating. By introducing three different microwave susceptors (activated carbon, SiC, and a mixture of activated carbon and SiC) during the microwave process, effective control of the ratio of metallic and ceramic phases was achieved easily. The effects of the three susceptors on the microstructure of the metal–ceramics and the related reaction mechanisms were also investigated in detail. The results show that the metal phase (Fe) and ceramic phase (Fe2SiO4, FeAl2O4) can be maintained, but the metal phase to ceramic phase changed significantly. In particular, the microstructures appeared as well-distributed nanosheet structures with diameters of ~400 nm and thicknesses of ~20 nm when SiC was used as the microwave susceptor.
Highlights
Fe/Fe2 SiO4 -FeAl2 O4 metal–ceramic can be prepared by introducing altered susceptors
Fe/Fe2SiO4-FeAl2O4 metal–ceramic can be prepared by introducing altered susceptors under microwave irradiation with mineral powder, AC, and kaolinite
This metal–ceramic is under microwave irradiation with mineral powder, AC, and kaolinite
Summary
The mineral processing process is mostly mining–crushing–. Since the minerals are mostly metal oxides, which do not directly provide the metals and alloys required to prepare metal–ceramics, they are mainly used for smelting the elements needed. 2 ofin heating, microwave heating possesses remarkable features, such as selective heating, ternal heating, and non-contact heating [5], which can build a uniform temperature field inside the material and promote the homogenization of the material. Microwaves processing [6], ceramics [7], and metallic materials [8], which have received much attenare widely used in the processing or preparing of various materials, such as mineral protion from scholars at home and abroad.materials. Can provideofthe required heat and activated carbon, graphite, and so on The dielectric constant these susceptors usually provide some insulation. Varies widely with temperature [10,11] and can provide the required heat and provide someHowever, insulation.the use of microwave sintering to convert minerals directly into metal–.
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