Structural and mechanical behaviour of 5% Al2O3-reinforced Fe metal matrix composites (MMCs) produced by powder metallurgy (P/M) route

Abstract

The aim of this paper is to investigate the effect of sintering temperature and time on the properties of Fe-Al 2 O 3 composite (5 wt% Al 2 O 3 ; 95 wt% Fe) prepared by powder metallurgy process. X-ray diffraction, microstructure, density, hardness and compressive strength of prepared samples have been investigated. XRD studies show the presence of Fe and Al 2 O 3 along with iron aluminate phase. Iron aluminate is formed as a result of reactive sintering between iron and alumina particles. Microstructural examination of the specimen showed a dense structure with nanosize dispersion of the reinforcement of ceramic phase. Density as well as hardness of specimens depend on the formation of iron aluminate phase, which in turn depends on sintering temperature and time.

Insights into the Active Species of Nanoparticle‐Functionalized Hierarchical Zeolites in Alkylation Reactions

“…The formation of the iron aluminate phase has been reported previously to be generated from Fe-Al 2 O 3 composites under similar ball-milling metallurgy processes from reactive sintering between Fe and Al 2 O 3 . [33,34] Iron aluminate does not have any acidity, which can explain the observed reduced acidity upon Fe incorporation in these materials, and consequently, such a material is not expected to have any catalytic activity in the alkylation reaction. [33,34] To further support this theory, iron aluminate prepared following a literature method [34] was also tested in the alkylation and showed no conversion to products under the investigated conditions.…”

“…[7,20] No lines that correspond to iron oxide nanoparticles could be visualised in this material be- cause of the low Fe loading, but the presence of such Fe 2 O 3 species was confirmed by XPS ( Figure 6). However, most of these reflections were not present in the XRD pattern of Fe 0.5/Z15c-NaOH (green line, Figure 8), which exhibited a broad amorphous band centred at 2 q = 258 and various intense diffraction lines that correspond to the formation of an iron aluminate phase (2 q = 31.8, 37.5-maximum intensity that corresponds to the (3 11) diffraction line-and 44.68), [33,34] with no evidence of the distinctive lines of iron oxide nanoparticles. The formation of the iron aluminate phase has been reported previously to be generated from Fe-Al 2 O 3 composites under similar ball-milling metallurgy processes from reactive sintering between Fe and Al 2 O 3 .…”

An overview of problems and solutions for components subjected to fireside of boilers

“…But coating with several metals is not possible such as TiAlN. It is also seen that due to thick coatings sometimes edges become round [107][108][109][110][111][112].…”

Effect of Sintering Mechanism on the Properties of ZrO2 Reinforced Fe Metal Matrix Nanocomposite

“…Formation of nano-iron aluminate and nano-iron zirconium oxide phase improves the hardness, wear, deformation, and corrosion properties of the composites significantly. Formation of these nanophases and their characteristics depend on sintering temperature and time [14][15][16][17][18][19]. Literature studies revealed that there are few reports on using zirconium dioxide (ZrO 2 ) as the reinforcement material in iron matrix [20].…”