High-Porosity Metal Foams: Potentials, Applications, and Formulations

Alhusseny, Ahmed; Nasser, Adel; Al-zurfi, NabeelM J

doi:10.5772/intechopen.70451

Cited by 8 publications

(4 citation statements)

References 56 publications

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“…A porous metal with high porosity offers a good impact energy absorption as it corroborates a uniform stress throughout the deformation; a porous metal is also capable of recovering energy efficiently [19]. In addition, the 15 PPI porous Ni is lighter in weight (lower in density) due to its hollow structure and bigger diameter interconnected of struts with hexagonal dodecahedron geometry node (see Fig.…”

Section: (C)mentioning

confidence: 98%

Investigation on Microstructure and Compressive Strength of Brazing Porous Nickel to Copper and Stainless Steel

Rozaimay,

Tuan Zahari,

Buys

et al. 2023

Acta Metall Slovaca

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This paper investigates the effects of brazing temperatures on the microstructure and compressive strength for brazing porous nickel to copper and stainless steel using VZ2250 as the brazing filler metal. A high vacuum furnace is used to braze the samples. Three different brazing process parameters were set with a heating and cooling rate of 10°C/min, respectively. The characteristics of the joint interface have been investigated to evaluate the performance of the brazed samples by use of scanning electron microscope, energy-dispersive X-Ray spectroscope, X-Ray diffractometer, and Instron Universal Testing machine. The data obtained has been quantitively analyzed to confirm the diffusion of the BFM during the brazing process. It has been found that the diffusion process resulted in an increase in the rigidity of the porous Ni. The compressive strength tests for the brazed joint showed that the maximum compressive strength can be achieved for brazing at 680°C. The highest compressive strength value has been justified by quantitative analysis of the microstructural data. It has been proved that the VZ2250 BFM effectively diffused into the porous Ni at the brazing temperature of 680°C; Cu3P and Cu6Sn5 were detected at the brazed Interface 1, whereas MnNi3 phase at the brazed Interface 2.

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Section: (C)mentioning

confidence: 98%

Investigation on Microstructure and Compressive Strength of Brazing Porous Nickel to Copper and Stainless Steel

Rozaimay,

Tuan Zahari,

Buys

et al. 2023

Acta Metall Slovaca

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“…In contrast, the open porosity is important when bonding with the material's interior is required, such as in filter elements. Open-porous materials can also be used as skeletons for infiltration by molten metal [2,3].…”

Section: Introductionmentioning

confidence: 99%

Ni Porous Preforms Compacted with Al2O3 Particles and Al Binding Agent

et al. 2023

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This work presents an energy-efficient, cheap, and rapid production method of a metal–ceramic preform with open porosity suitable for liquid metal infiltration and filtration applications. It is based on cold isostatic pressing of a mixture of relatively hard Ni and Al2O3 powders with the addition of small amount of Al powders, acting as a binding agent. Open porosity is primarily controlled by Al2O3 particles partially separating Ni particles from mutual contacts. Cold isostatic pressed green compacts were subjected to thermal oxidation by heating in air to 600 °C, 700 °C, and 800 °C. The weight gain and open porosity of oxidized compacts were examined. The chemical composition and microstructure were analyzed by SEM-EDS and XRD techniques. The stability of preforms and the effect of thermal cycling on the open porosity were tested by thermal cycling in an inert Ar atmosphere in the temperature range up to 800 °C. It appeared that, in addition to NiO being an expected product of oxidation, Ni aluminides and spinel particles also played an important role in inter-particle bonding formation. Ni-NiO porous composites resist chemical corrosion and exhibit structural and chemical stability at higher temperatures and admixed Al2O3 particles do not deteriorate them. After subsequent infiltration with Al, it can offer a lower density than other materials, which could result in lower energy consumption, which is highly needed in industries such as the automotive industry.

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“…Metal oxide foams have been primarily studied in catalysis due to their high porosity (75-95%) and large surface areas (up to 3000 m 2 m −3 ). [13][14][15][16] Foams have also been used as scaffolds in tissue engineering and for the fabrication of filters. 17,18 Although, metal oxide foams have not been yet used in crystallization processes to the best of the authors' knowledge, there are some examples where the growth of metal oxide crystals was influenced by organic molecules.…”

Section: Introductionmentioning

confidence: 99%