Oxidation resistance of SHS Fe–Al–Si alloys at 800 °C in air

Novák, Pavel; Zelinková, Michala; Šerák, Jan; Michalcová, Alena; Novák, Michal; Vojtěch, Dalibor

doi:10.1016/j.intermet.2011.04.011

Cited by 48 publications

(54 citation statements)

References 35 publications

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“…Refs. [6,19,22,26,27]. Unfortunately, the occurrence of dierent polytypes of Al 2 O 3 at higher temperatures or in dierent environments makes it dicult to extrapolate the results obtained at higher temperatures to the experiments performed in this work.…”

Section: Al2o3 Fe2o3mentioning

confidence: 81%

High Temperature Oxidation of Spark Plasma Sintered and Thermally Sprayed FeAl-Based Iron Aluminides

et al. 2012

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The presented work deals with the oxidation resistance of spark plasma sintered and thermally sprayed FeAl-based intermetallics. Gas-atomized binary single phase Fe43(at.%)Al and dual phase Fe55(at.%)Al powders were used for spark plasma sintering and/or thermal spraying. Coatings were deposited by two dierent plasma spray technologies gas and water stabilized plasma guns. The prepared samples were exposed to oxidation in articial air at 700• C. The mass gain was measured during oxidation at 700• C up to 1000 h. Microstructures, phase and chemical compositions of the formed scales were characterized after the exposition by means of scanning electron microscopy, X-ray diraction and electron spectroscopy for chemical analysis (X-ray photoelectron spectroscopy).

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Section: Al2o3 Fe2o3mentioning

confidence: 81%

High Temperature Oxidation of Spark Plasma Sintered and Thermally Sprayed FeAl-Based Iron Aluminides

et al. 2012

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“…This oxide is known 5 10 20 48 792 5 1 5 96 560 10 2 1 144 426 16 3 2 192 404 15 4 2 240 305 14 6 2 288 336 13 6 4 336 308 14 7 4 The above described dierences in oxidation are quantied as parabolic rate constants (k p ) in Table III open pores are lled with oxides. Therefore, the active surface area is reduced and oxidation rate decreases [12].…”

Section: Mechanical and Tribological Propertiesmentioning

confidence: 99%

Structure and Properties of Fe-Ni-Al-Si Alloys Produced by Powder Metallurgy

et al. 2012

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Reactive sintering powder metallurgy is a simple alternative to conventional melting and powder metallurgy processes. During this process, pressed powder mixture of pure metals or other precursors is transformed into bulk intermediary phases by thermally activated in situ reaction. This process was previously tested on FeAl and FeAlSi alloys. Positive eect of silicon on the reactive sintering behaviour was determined, leading to the development of novel carbon-free high-silicon FeAl20Si20 alloy (given in wt%). In this work, the eect of nickel on the pressureless reactive sintering of FeAlSi pressed powder mixtures was studied. To explain the nickel inuence, dierential thermal analysis was utilized. Microstructure, phase composition and porosity of the FeAl20Si20Nix (x = 0, 5, 10, 20 wt%) alloys was described. Hardness, wear resistance, high-temperature oxidation resistance and thermal stability were evaluated as functions of nickel content. Results showed that porosity decreases with growing nickel content down to less than 3 vol.%. Oxidation rate of these alloys is more than 10 times lower than that of original FeAl20Si20 alloy. Thermal stability and abrasive wear resistance of these alloys is also superior to FeAl and FeAlSi materials.

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“…Therefore, our team focused on the development of carbon-free iron aluminide-based materials. It has been proven that silicon positively affects oxidation resistance [15]. Recently, we described the microstructure, phase composition, oxidation behavior, and mechanical properties of an FeAl20Si20 alloy (in wt.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we described the microstructure, phase composition, oxidation behavior, and mechanical properties of an FeAl20Si20 alloy (in wt. %) that was easily producible by various powder metallurgical processes, such as self-propagating high-temperature synthesis [15] and mechanical alloying in combination with spark The microstructure of the alloys that were produced by combination of mechanical alloying and spark plasma sintering was studied with a VHX 5000 digital microscope (Keyence, USA) after etching by modified Kroll's reagent (5 mL of HNO 3 , 10 mL of HF, and 85 mL of H 2 O) and by a Lyra3 GMU scanning electron microscope (Tescan, Brno, Czech Republic) with an X-max 80 mm 2 energy dispersive spectrometer (EDS) (Oxford Instruments, High Wycombe, UK) after etching in Keller's reagent (2.5 mL of HNO 3 , 1 mL of HF, 1.5 mL of HCl, and 95 mL of H 2 O). Phase composition was identified by X-ray diffraction analysis (XRD) while using an X'Pert Pro 2.0a (PANalytical, Almelo, Netherlands) X-ray diffractometer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nickel and Titanium on Properties of Fe-Al-Si Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

et al. 2020

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F.P.) 2 SVÚOM s.r.o., U Měšt'anského pivovaru 934/4, Abstract: This paper describes the structure and properties of an innovative Fe-Al-Si alloy with a reduced amount of silicon (5 wt. %) in order to avoid excessive brittleness. The alloy was produced by a combination of mechanical alloying and spark plasma sintering. Nickel and titanium were independently tested as the alloying elements for this alloy. It was found that wear resistance, which reached values comparable with tool steels, could be further improved by the addition of nickel. Nickel also improved the high-temperature oxidation behavior, because it lowers the liability of the oxide layers to spallation. Both nickel and titanium increased the hardness of the alloy. Titanium negatively influenced oxidation behavior and wear resistance because of the presence of titanium dioxide in the oxide layer and the brittle silicides that caused chipping wear, respectively. plasma sintering [16]. The alloys exhibited a very good oxidation resistance at high temperatures-much better than binary Fe-Al and Fe-Si alloys [17]. The improvement of oxidation resistance does not lie in the incorporation of silicon to the oxide layer in a significant amount; rather, it lies in the formation of large volume fraction of silicides under the oxide layer, when aluminum diffuse to the surface in order to form Al 2 O 3 . Additionally, it has been found that the presence of silicon reduces the amount of iron oxide in scales, causing their better adherence to a substrate due to a more favorable Pilling-Bedworth ratio [16]. However, the FeAl20Si20 alloy is very brittle. Powder metallurgy methods, including our high-energy mechanical alloying [18] and spark plasma sintering, allowed for an increase in the fracture toughness, but the values at room temperature still reached the parameters of brittle ceramics, i.e., approximately 3.5 MPa.m 1/2 [16]. Due to these parameters, the alloy could be applicable as a protective coating rather than as a bulk material.In recent research, we studied the high-temperature oxidation resistance of Fe-Al-Si alloys and its dependence on the Al:Si ratio, and we found that the 35:5 provided almost the same oxidation performance [17]. Since silicon is listed as a critical raw material in the EU [19], the minimization of its amount is reasonable. In a parallel research, our team studied Ti-Al alloys and proved that silicon also improves their oxidation behavior and reinforces the material by forming hard Ti 5 Si 3 silicides [20]. On the other hand, nickel is known to form stable aluminides rather than silicides [21].Therefore, this work aimed at a possible improvement of the properties of a lower-silicon FeAl35Si5 alloy by the addition of titanium as the expected silicide-forming element and nickel as the probable aluminide stabilizer. The tests were intended to study the high temperature oxidation behavior, basic mechanical properties, and tribological properties. Materials and Methods

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Oxidation resistance of SHS Fe–Al–Si alloys at 800 °C in air

Cited by 48 publications

References 35 publications

High Temperature Oxidation of Spark Plasma Sintered and Thermally Sprayed FeAl-Based Iron Aluminides

High Temperature Oxidation of Spark Plasma Sintered and Thermally Sprayed FeAl-Based Iron Aluminides

Structure and Properties of Fe-Ni-Al-Si Alloys Produced by Powder Metallurgy

Effect of Nickel and Titanium on Properties of Fe-Al-Si Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

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