Effect of Cell Size on the High Temperature Oxidation Properties of Fe-Cr-Al Powder Porous Metal Manufactured by Electro-spray Process

Oh, Jae-Sung; Kong, Young‐Min; Kim, Byoung-Kee; Lee, Kee‐Ahn

doi:10.4150/kpmi.2014.21.1.55

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…Ni-based superalloy foam fabricated using the powder alloying process can have homogeneous distributions of alloying elements and pore sizes. The authors of this study have investigated the high-temperature mechanical properties and high-temperature oxidation properties of this superalloy foam [12][13][14]. However, the elemental composition of the superalloy foam fabricated with powder alloying process is controlled by the mass ratio between the pure metal pre-foam and the sprayed alloying powder.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Kang¹,

Kim²,

Lee³

et al. 2020

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An open-cell Ni-Mo-Cr foam was newly manufactured using electrostatic powder spraying process and its room-temperature compressive properties were investigated in this study. For manufacturing Ni-Mo-Cr foam, Ni-Mo-Cr powders were sprayed on the polyurethane pre-form by electrostatic powder spraying process. And then, Ni-Mo-Cr powder sprayed pre-forms were sintered at 1200℃, 1250℃, and 1300℃, respectively. The relative densities of Ni-Mo-Cr foams were measured at 4 ~ 5%. Room temperature compressive curves of ESP Ni-Mo-Cr foams represented the typical compressive 3-stages (elastic, plateau, densification) of open-cell metallic foam. As a result of observation of deformed specimen, the fracture mode found to be changed from brittle to ductile as sintering temperature increased. Based on these findings, correlations between structural characteristics, microstructure, and compressive deformation behavior were also discussed.

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Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Kang¹,

Kim²,

Lee³

et al. 2020

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Fabrication and Mechanical Properties of Open‐Cell Austenitic Stainless Steel Foam by Electrostatic Powder Spraying Process

et al. 2020

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An open‐cell metallic foam is newly manufactured using the electrostatic powder spraying (EPS) process, and its room temperature compressive and energy absorption properties are investigated. EPS is a process that uses electrostatic forces. The powder is negatively charged by applying direct current high voltage and undergoes electrostatic spraying on a positively charged polyurethane pre‐form. To control relative density (ρ*/ρ), three different spray amounts are applied (2.5, 3.5, and 4.5 kg m−2). Also, the relative density is measured to increase constantly with the spray amount. The room temperature compressive curves of the EPS foams represent the typical compressive stages (linear elastic, plastic collapse, and densification) of metallic foam. The plateau strengths of the EPS foams measure 0.48 MPa (spraying amount: 2.5 kg m−2), 0.76 MPa (spraying amount: 3.5 kg m−2), and 1.23 MPa (spraying amount: 4.5 kg m−2), respectively. Also, EPS 316L foam with the smallest spray amount has a lower energy absorption amount compared with other types of foam. This study also discusses the compressive and energy absorption behaviors of an open‐cell metallic foam manufactured using the EPS process in relation to its structural and microstructural characteristics.

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Effect of Al2O3 Inter-Layer Grown on FeCrAl Alloy Foam to Improve the Dispersion and Stability of NiO Catalysts

이유진¹,

구본율²,

백성호³

et al. 2015

Korean. J. Mater. Res.

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NiO catalysts/Al 2 O 3 /FeCrAl alloy foam for hydrogen production was prepared using atomic layer deposition (ALD) and subsequent dip-coating methods. FeCrAl alloy foam and Al 2 O 3 inter-layer were used as catalyst supports. To improve the dispersion and stability of NiO catalysts, an Al 2 O 3 inter-layer was introduced and their thickness was systematically controlled to 0, 20, 50 and 80 nm using an ALD technique. The structural, chemical bonding and morphological properties (including dispersion) of the NiO catalysts/Al 2 O 3 /FeCrAl alloy foam were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy and scanning electron microscopy-energy dispersive spectroscopy. In particular, to evaluate the stability of the NiO catalysts grown on Al 2 O 3 /FeCrAl alloy foam, chronoamperometry tests were performed and then the ingredient amounts of electrolytes were analyzed via inductively coupled plasma spectrometer. We found that the introduction of Al 2 O 3 inter-layer improved the dispersion and stability of the NiO catalysts on the supports. Thus, when an Al 2 O 3 inter-layer with a 80 nm thickness was grown between the FeCrAl alloy foam and the NiO catalysts, it indicated improved dispersion and stability of the NiO catalysts compared to the other samples. The performance improvement can be explained by optimum thickness of Al 2 O 3 inter-layer resulting from the role of a passivation layer.

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Effect of Cell Size on the High Temperature Oxidation Properties of Fe-Cr-Al Powder Porous Metal Manufactured by Electro-spray Process

Cited by 4 publications

References 13 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Fabrication and Mechanical Properties of Open‐Cell Austenitic Stainless Steel Foam by Electrostatic Powder Spraying Process

Effect of Al2O3 Inter-Layer Grown on FeCrAl Alloy Foam to Improve the Dispersion and Stability of NiO Catalysts

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