Enhancement of Physical and Mechanical Properties of Oxide Dispersion-Strengthened Tungsten Heavy Alloys

Daoush, Walid M.; Elsayed, Ayman; Kady, Omayma Abdel Gawad El; Sayed, Mohamed A.; Dawood, Osama

doi:10.1007/s11661-016-3360-7

Cited by 17 publications

(3 citation statements)

References 32 publications

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“…A preliminary study was takes place to optimize the compaction pressure and the sintering conditions of the prepared BN/Ni-Cu powder mixtures according to our previous work [17,[21][22][23][24][25][26]. The obtained compacts are sintered for 2 h in a closed furnace in controlled atmosphere of 3:2 N 2 /H 2 gas mixtures at 1000 C. Finally, the furnace is turned off and the sintered specimens are maintained in the furnace for cooling in N 2 atmosphere.…”

Section: Consolidation Of Bn/20ni-cu Powdersmentioning

confidence: 99%

Microstructure and properties of BN/Ni-Cu composites fabricated by powder technology

El-Tantawy

Daoush

El-Nikhaily

2018

Journal of Experimental Nanoscience

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Microsize Powders of Ni and Cu were prepared by water atomization technique to fabricate metal matrix composites containing various percentages of nanosized boron nitride particles (1, 2, 3, 4, 5 wt. % of BN in a matrix containing (20 wt. %Ni and 80 wt. %Cu). The prepared mixtures were cold compacted under 400 MPa, and sintered for 2 h at 1000 C in a controlled atmosphere of 3:2 N 2 /H 2 gas mixtures. The microstructure and the chemical composition of the prepared powders as well as the consolidated composites were investigated by X-ray diffraction as well as field emission scanning electron microscope (FESEM) equipped with an energy dispersive spectrometer (EDS). The produced Cu and Ni powders have spheroid shape of size less than 100 microns, but the investigated BN has an equiaxed particle shape and particle size of » 500 nm. It has been also observed that BN and Ni particles were homogeneously distributed in the Cu matrix of the present BN/NiCu composites. The density, electrical resistivity, saturation magnetization and hardness of the composites were measured. It was observed that, by increasing BN content, the relative density was decreased, while the saturation magnetization, electrical resistivity and hardness were increased.

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Section: Consolidation Of Bn/20ni-cu Powdersmentioning

confidence: 99%

Microstructure and properties of BN/Ni-Cu composites fabricated by powder technology

El-Tantawy

Daoush

El-Nikhaily

2018

Journal of Experimental Nanoscience

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“…In addition, the oxide particles improve the densification process and decrease the porosity level by capturing the oxygen in the matrix. [7,9,13,14]. The results also show that the tungsten grains grow considerably into round globular shapes at higher sintering temperature (as seen in samples three, six, and nine).…”

Section: Figurementioning

confidence: 65%

Effect of Transition Metals Oxides on the Physical and Mechanical Properties of Sintered Tungsten Heavy Alloys

et al. 2020

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The addition of transition element oxides to tungsten heavy alloys (WHAs) fabricated by powder metallurgy technique provides new materials with higher density and electrical conductivity, which may be adequate in some applications such as kinetic energy penetrators. Additionally, materials with higher electrical conductivity are required for electrical contact applications such as electrical discharge machining (EDM) electrode materials. WHAs were fabricated by compacting its mixed constituents followed by sintering. Ni, Co and Fe are used as binding phases of the tungsten particles and oxides of Zr, Ti and Y are used as oxide dispersing strengthening (ODS) agents of the sintered materials. The results show that all of the chosen factors (i.e., pressure of compaction process, temperature of sintering, type of binding material and type of oxide) have clear effects on all properties of ODS tungsten heavy alloy specimens. The density and electrical conductivity increase with the increase in sintering temperature. Hardness and compression strength were also measured to evaluate the mechanical properties of sintered samples.

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“…Figure 11 shows Nyquist plots of the prepared Ti–12Mo/Al 2 O 3 nanocomposites. The Nyquist plot shows the measuring frequency region of one-semicircle that is due to the formation of a complete film of passive barrier on the surface of the nanocomposite sample ( Daoush et al, 2016 ; Sayed et al, 2017 ; Elsayed et al, 2020 ). The obtained parameters are directly computed by the mean of software of the EIS testing device, as listed in Table 5 .…”

Section: Resultsmentioning

confidence: 99%

Fabrication and characterization of Ti–12Mo/xAl2O3 bio-inert composite for dental prosthetic applications

Yehia,

El-Tantawy,

Elkady

et al. 2024

Front. Bioeng. Biotechnol.

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Introduction: Titanium (Ti)-molybdenum(Mo) composites reinforced with ceramic nanoparticles have recently significant interest among researchers as a new type of bio-inert material used for dental prosthetic applications due to its biocompatibility, outstanding physical, mechanical and corrosion properties. The current work investigates the impact of alumina (Al2O3) nanoparticles on the properties of the Ti–12Mo composite, including microstructure, density, hardness, wear resistance, and electrochemical behavior.Methods: Ti–12Mo/xAl2O3 nanocomposites reinforced with different Al2O3 nanoparticles content were prepared. The composition of each sample was adjusted through the mechanical milling of the elemental constituents of the sample for 24 h under an argon atmosphere. The produced nanocomposite powders were then cold-pressed at 600 MPa and sintered at different temperatures (1,350°C, 1,450°C, and 1,500°C) for 90 min. Based on density measurements using the Archimedes method, the most suitable sintering temperature was found to be 1,450°C. The morphology and chemical composition of the milled and sintered composites were analyzed using back-scattering scanning electron microscopy (SEM) and X-ray diffraction (XRD).Results and Discussion: The results showed that the addition of Mo increased the Ti density from 99.11% to 99.46%, while the incorporation of 15wt% Al2O3 in the Ti–12Mo composite decreased the density to 97.28%. Furthermore, the Vickers hardness and wear behavior of the Ti–Mo composite were enhanced with the addition of up to 5 wt% Al2O3. The sample contains 5 wt% Al2O3 exhibited a Vickers hardness of 593.4 HV, compared to 320 HV for pure Ti, and demonstrated the lowest wear rate of 0.0367 mg/min, compared to 0.307 mg/min for pure Ti. Electrochemical investigations revealed that the sintered Ti–12Mo/xAl2O3 nanocomposites displayed higher corrosion resistance against a simulated artificial saliva (AS) solution than pure Ti. The concentrations of Ti, Mo, and Al ions released from the Ti–12Mo/xAl2O3 nanocomposites in the AS solution were within the safe levels. It was found from this study that; the sample of the composition Ti–12Mo/5wt%Al2O3 exhibited appropriate mechanical properties, biocompatibility, corrosion resistance against the AS solution with acceptable ion concentration released in the biological fluids. Therefore, it can be considered as a new bio-inert material for potential applications in dental prosthetics.

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Enhancement of Physical and Mechanical Properties of Oxide Dispersion-Strengthened Tungsten Heavy Alloys

Cited by 17 publications

References 32 publications

Microstructure and properties of BN/Ni-Cu composites fabricated by powder technology

Microstructure and properties of BN/Ni-Cu composites fabricated by powder technology

Effect of Transition Metals Oxides on the Physical and Mechanical Properties of Sintered Tungsten Heavy Alloys

Fabrication and characterization of Ti–12Mo/xAl2O3 bio-inert composite for dental prosthetic applications

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