Formation of porous Ni–Al intermetallics through pressureless reaction synthesis

Dong, Hongxing; Jiang, Yao; He, Yuehui; Song, Min; Zou, Jin; Xu, Nanping; Huang, Baiyun; Liu, Chang; Liaw, Peter K.

doi:10.1016/j.jallcom.2009.05.079

Cited by 74 publications

(31 citation statements)

References 29 publications

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“…4. It can be seen that the final product of Ni3Al is present in the samples, It is known that the phase transformation of Ni-Al powder compacts durng sintering can be varied with different sintering temperature [6,7]. The formation of intermediate phases, such as Ni2Al3, NiAl and Ni3Al phases, was found in the compacts at the sintering temperature of 600C with sufficient holding time, owing to the interdiffusion and reaction of Al and Ni powders.…”

Section: Resultsmentioning

confidence: 96%

“…Different intrinsic diffusion coefficients between Ni and Al also create fine pores, contributing to increasing microporosity in cell walls and struts. The sequence of phase formation in the Ni-Al intermetallic foams is thought to be as follows [7]. 6 shows the microhardness values of Ni-Al intermetallic foams produced using various carbamide contents.…”

Section: Resultsmentioning

confidence: 99%

“…Among all types of open-cell metallic foams, nickel (Ni) foams have attracted much attention [5][6][7][8][9][10][11]. Application of Ni-based foams is commonly found in electronic and automotive industries as high power batteries, owing to their high capacity and safety characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Production of Ni-Al Foams with Hierarchical Porosity

Asavavisithchai

Lorlekpech

Muangyai

2015

Trans. Mat. Res. Soc. Japan

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Open-cell nickel aluminide (Ni-Al) intermetallics foams have attracted much attention in industries at which high temperature and severe environment are concerned, due to their good physical and chemical properties. A combination of different pore structures and morphologies in a single monolithic matrix can extend the properties of a material from which a wide range of applications can be applied. In the present study, open-cell Ni-Al intermetallic foams with hierarchical porosities have been developed through a sintering and dissolution process (SDP) and reactive synthesis techniques. The carbamide particles of various contents were used as a space holder material to create macropores in the foams. Micropores were formed as the result of to the formation of initial fine pores between the powders in the compacts, the volatilization of gases evolved during reactive sintering and different diffusion coefficients between Ni and Al. After sintering, only Ni3Al is present in the matrix.Key words: Ni-Al intermetallics, metallic foam, powder metallurgy, porosity INTRODUCTIONOpen-cell metallic foams are attractive engineering materials which are effectively used in many functional applications such as heat exchanger, catalyst support, filter, sound insulator and bone-replacement implant, due to a combination of their appealing properties, including large surface area, interpenetrating porosity and high specific strength [1][2][3][4]. Among all types of open-cell metallic foams, nickel (Ni) foams have attracted much attention [5][6][7][8][9][10][11]. Application of Ni-based foams is commonly found in electronic and automotive industries as high power batteries, owing to their high capacity and safety characteristics. A recent development in hybrid electric vehicles has driven the use of Ni-based battery, such as nickel-metal-hydride (Ni-MH) as a hydrogen-storing alloy [11]. Another group of potential Ni-based foam is porous Ni-Al alloys. They have excellent oxidation and corrosion resistances due to the formation of protective -Al2O3 on the surface at high temperatures [12,13]. Due to their good physical and chemical properties, they can then be used in applications at which high temperature and severe environment are concerned.There are many processing methods to fabricate open-cell metallic foams, ranging from the utilization of base metal that started out as a liquid [14] and the employment of base metal as metallic powder [15,16]. The powder-based method has many advantages since high melting point metal and large alloying variation can be processed. Material handling also gives the ability to control size, structure, quantity, and inner cavity structure.The sintering and dissolution process (SDP) method is a simple, convenient and effective technique [15]. It is considered as one of the most widely used replication processes. It enables manufacturers to control pore architecture, morphology and dimension. The process is

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Production of Ni-Al Foams with Hierarchical Porosity

Asavavisithchai

Lorlekpech

Muangyai

2015

Trans. Mat. Res. Soc. Japan

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“…In addition, the solar absorber Ni-5Al has attracted considerable attention as a solar selective coating for concentrating solar radiation at high operating temperatures [10]. Ni-Al composite coatings are particularly applied to numerous special applications that required a high melting point, lowdensity (5890 kg m −3 ), high thermal conductivity, excellent anticorrosion, high-temperature oxidation, high thermal stability, and high-temperature mechanical properties [11][12][13]. A previous study by this researcher has successfully prepared Ni-Al solar absorber using a flame spray technique, especially, the α of the Ni-Al solar absorber was 0.77 [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ni–Al coating thickness on spectral selectivity and thermal performance of parabolic trough collector

Suriwong

Bunmephiphit

Wamae

et al. 2018

Mater Renew Sustain Energy

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This study investigates the influence of Ni-Al coating thickness on the spectral selectivity and thermal performance of a parabolic trough collector (PTC). Three thicknesses of Ni-Al coating for use as solar absorber material were successfully prepared on the outer surface of a stainless steel 316L (SS) tube by flame spray. The phase, morphology, and reflectance (R) of the Ni-Al coatings were characterized using several techniques. The PTC and solar receiver tube were specially designed and constructed for observing the collector thermal performance by following ASHRAE . Looking at the results, the actual average thicknesses of the three Ni-Al coatings turn out to be 195, 215, and 299 μm. The morphology and chemical composition of all three thicknesses are similar. The chemical composition in the cross-sectional view exhibits non-uniform distribution. The three thicknesses of the coating are composed of NiO and Al 2 O 3 phases, which also corresponded to the results of SEM-EDX mapping. The differences in a solar absorptance (α) of the three thicknesses of Ni-Al coating are not statistically significant, with an average α value of 0.74-0.75. However, there are differences in thermal efficiency of the PTC depending on the thickness of the Ni-Al coating. Of the three samples, the thickest one (299 µm) demonstrates the highest ability to convert solar radiation into thermal energy.

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“…It is mainly due to their low density, high temperature stability and high strength to weight ratio [1,2]. In addition, they exhibit excellent corrosion and oxidation resistance especially at the high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Forming of Intermetallic Phases During Infiltration of Nickel Rods and Powders With Molten Aluminium

Opálek¹,

Kúdela²,

Nosko³

et al. 2013

Acta Metall. Slovaca Conf.

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Reaction kinetics in the Al-Ni system was investigated considering the fact that Al-Ni composites have been found as attractive candidates for a number of industrial sectors. Al-Ni composites were prepared by gas-assisted infiltration of either Ni rods or Ni powders with molten Al. Microstructural analysis revealed that various Ni aluminides were grown and their formation and the morphology at the interfacial zones can be effectively controlled by the time of infiltration. Furthermore, we pointed to the instability in the Al-Ni system that was caused by the presence of the pure Al metal. This could be completely abolished by the additional thermal treatment.

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Formation of porous Ni–Al intermetallics through pressureless reaction synthesis

Cited by 74 publications

References 29 publications

Production of Ni-Al Foams with Hierarchical Porosity

Production of Ni-Al Foams with Hierarchical Porosity

Influence of Ni–Al coating thickness on spectral selectivity and thermal performance of parabolic trough collector

Forming of Intermetallic Phases During Infiltration of Nickel Rods and Powders With Molten Aluminium

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