Abstract
The Fe/FeAl2O4 cermet was prepared with Fe-Fe2O3-Al2O3 powder by a hot press sintering method at 1400 °C. The raw materials for the powder particles were respectively 2 µm (Fe), 0.5 µm (Fe2O3), and 0.5 µm (Al2O3) in diameter, the sintering pressure was 30 MPa, and the holding time was 120 min. The effects of different Fe mass ratios on the microstructure and mechanical properties of Fe/FeAl2O4 cermet were studied. The results showed that a new ceramic phase FeAl2O4 could be formed by an in situ reaction during the hot press sintering. When the Fe mass ratio was increased, the microstructure and mechanical properties of the Fe/FeAl2O4 cermet showed a change law that initially became better and then became worse. The best microstructure and mechanical properties were obtained in the S2 sample, where the mass ratio of Fe-Fe2O3-Al2O3 was 6:1:2. In this Fe mass ratio, the relative density was about 94%, and the Vickers hardness and bending strength were 1.21 GPa and 210.0 MPa, respectively. The reaction mechanism of Fe in the preparation process was the in situ synthesis reaction of FeAl2O4 and the diffusion reaction of Fe to FeAl2O4 grains. The increase of the Fe mass ratio improved the wettability of Fe and FeAl2O4, which increased the diffusion rate of Fe to FeAl2O4 grains, which increased the influence on the structure of FeAl2O4.
Highlights
Fe/FeAl2 O4 cermet was prepared during the process of hot pressing and sintering
The results show that there were only the Fe phase in the prepared Fe/FeAl2O4 cermet
The increased Fe content increased the relative density of the Fe/FeAl2 O4 cermet, which remain at about 94% after sample S2
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Iron-based cermet has the high hardness of ceramics, good thermal stability, good wear resistance, corrosion resistance, as well as metals’ thermal conductivity and toughness [1,2,3,4]. It has mainly been used in aviation, automotive, and petroleum engineering, as well as engineering in machinery such as brakes or clutches [5,6,7,8,9]. The low raw material cost of iron-based cermet greatly reduces the preparation cost and promotes the wide application of metal-based ceramics. This work could provide an important theoretical basis for the comprehensive utilization of metallurgical solid waste [23,24]
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