Fe-Al intermetallic foam with porosity above 60 % prepared by thermal explosion

Cai, Xiaoping; Liu, Yanan; Feng, Peizhong; Jiao, Xinyang; Zhang, Laiqi; Wang, Jianzhong

doi:10.1016/j.jallcom.2017.10.228

Cited by 41 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to identify the appearance of the TE reaction, the same thermal programs were repeatedly conducted in the same furnace with the same heating rate in a flowing argon atmosphere (100 mL min −1 ), and the thermocouples (WRe3‐WRe25 with a diameter of 0.1 mm) were placed between two discs to record the specimen temperatures with a frequency of 100 Hz. The details of monitoring the temperature of the sample were previously reported . In addition, the images of the TE reaction process were recorded by a digital high‐speed video camera that allowed us to visually observe the process.…”

Section: Methodsmentioning

confidence: 99%

“…The TE mode has drawn special attention because of its advantages of time‐saving, low energy consumption, and simplicity of the sintering procedure and is widely applicable to the weakly exothermic reactions that need to be activated by preheating process prior to ignition, such as less exothermic intermetallic systems Ni–A1, Ti–Al, and Cu–A1 . However, relatively few studies are available on the preparation of porous FeAl intermetallics by the TE mode …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication and Characterization of Highly Porous FeAl‐Based Intermetallics by Thermal Explosion Reaction

et al. 2019

Self Cite

View full text Add to dashboard Cite

Porous FeAl-based intermetallics with different nominal compositions ranging from Fe-40 at% Al to Fe-60 at% Al are prepared by a novel process of thermal explosion (TE) mode. The results show that the Al content significantly affects the combustion behavior of the specimens, the ignition temperature of the Fe-Al intermetallics varies from 641 to 633 C and the combustion temperature from 978 to 1179 C. The porous materials exhibit uniform pore structures with porosities and average pore sizes of 52-61% and 20-25 mm, respectively. The TE reaction is the dominant pore formation mechanism regardless of the alloy composition. However, differences in the porosity and average pore size are observed depending on the Al content. The compressive strength of porous Fe-Al intermetallics is in the range of 23-34 MPa, duly applied as filters. Additionally, a surface alumina layer is formed at the early stage and both of the oxidation process and the sulfidation process follows the familiar parabolic rate law in the given atmosphere, exhibiting excellent resistance to oxidation and sulfidation. These results suggest that the porous Fe-Al intermetallics are promising materials for applications in harsh environments with a high-temperature sulfide-bearing atmosphere, such as in the coal chemical industry.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Highly Porous FeAl‐Based Intermetallics by Thermal Explosion Reaction

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…The combustion synthesis method consists of two different modes, TE (thermal explosion) which combustion is performed by heating the total compact at the desirable temperature [32,33] and SHS (self-propagating high temperature synthesis) which combustion is performed by heating one side of the compact and propagated to whole it [23,34]. To determine the kind of combustion synthesis mode, it must be calculated adiabatic temperature (T ad ) of reaction takes place during combustion synthesis.…”

Section: Resultsmentioning

confidence: 99%

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

Mehrizi¹

2020

Preprint

View full text Add to dashboard Cite

The aim of this study was the synthesis of a homogenous distributed NiAl/TiC composite by combustion synthesis of elemental powders. The effect of the mechanical activation process was evaluated. The phase characterization and evaluation of the microstructure during milling and combustion synthesis were carried on by XRD and SEM-EDS and TEM-EDS, respectively. The XRD result of as-mixed powder compact after combustion synthesis showed that in addition to TiC0.75 and NiAl, some undesired phases like Ni3Al and Ni2Al3 formed. While after combustion synthesis of 3h mechanically activated powder compact, only AlNi and TiC formed. The microstructural evaluations by SEM-EDS and TEM-EDS analysis confirmed the synthesis of truly homogenized NiAl/TiC composite. The mechanism of NiAl/TiC formation consists of dissolution of nickel, titanium, and graphite in molten aluminum and precipitation of TiC primarily and then the formation of NiAl. The value of microhardness of synthesized NiAl/TiC was 1070±12 HV. The main reason for this result is a uniform distribution of spherical TiC reinforcement in the NiAl matrix. Therefore, the mechanical activation process facilitated the reactions and improved the mechanical properties of the final composite.

show abstract

“…Sintering of intermetallic alloys from the Fe-Al binary diagram allows also the use of the thermal explosion (TE) reaction, above 650 °C, which is responsible for the pores foaming [ 16 ]. Thus, the addition of a foaming agent at the temperatures over the TE reaction allows one to obtain contributions of both TE and chemical foaming action due to the gas release.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of FeAl Intermetallic Foams by Tartaric Acid-Assisted Self-Propagating High-Temperature Synthesis

2018

View full text Add to dashboard Cite

Iron aluminides are intermetallics with interesting applications in porous form thanks to their mechanical and corrosion resistance properties. However, making porous forms of these materials is not easy due to their high melting points. We formed FeAl foams by elemental iron and aluminum powders sintering with tartaric acid additive. Tartaric acid worked as an in situ gas-releasing agent during the self-propagating high-temperature synthesis of FeAl intermetallic alloy, which was confirmed by X-ray diffraction measurements. The porosity of the formed foams was up to 36 ± 4%. In the core of the sample, the average equivalent circle diameter was found to be 47 ± 20 µm, while on the surface, it was 35 ± 16 µm; thus, the spread of the pore size was smaller than reported previously. To investigate functional applications of the formed FeAl foam, the pressure drop of air during penetration of the foam was examined. It was found that increased porosity of the material increased the flow of the air through the metallic foam.

show abstract

Fe-Al intermetallic foam with porosity above 60 % prepared by thermal explosion

Cited by 41 publications

References 27 publications

Fabrication and Characterization of Highly Porous FeAl‐Based Intermetallics by Thermal Explosion Reaction

Fabrication and Characterization of Highly Porous FeAl‐Based Intermetallics by Thermal Explosion Reaction

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

Fabrication of FeAl Intermetallic Foams by Tartaric Acid-Assisted Self-Propagating High-Temperature Synthesis

Contact Info

Product

Resources

About