Synthesis and Characterization of Nickel-Alumina Composites from Recycled Nickel Powder

Karayannis, Vayos

doi:10.1155/2012/395612

Cited by 17 publications

(10 citation statements)

References 30 publications

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“…This behavior indicates that the cold welding process which occurred during the MA was predominant in the first 5 hours, causing the greatest agglomeration between particles. Then a reduction in the average particle size was observed from 5 hours onwards, indicating that the fracture process prevailed in these cases 7,9 . However, the efficiency of mechanical alloying is gradually reduced with increasing grinding time due to the decrease in the angulation of both curves, with the tendency to become asymptotes to the x axis of the (milling time).…”

Section: Resultsmentioning

confidence: 94%

Obtaining Composites Powders of Al2 O3 / Ni and Al2 O3 / Nb by Mechanical Alloying

et al. 2019

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Mechanical alloying (MA) can be highlighted among the various methods and powder processing forms, which consists of producing homogeneous materials from elementary powders. This process is of paramount importance as it has the ability to reduce the particle size of the powders and can often promote bonding between elements which have low interaction and wettability. This method is usually used in the route of powder metallurgy, and generally improves the sinterability and mechanical properties of the materials. In this context, the objective of this work was to analyze the evolution of mixtures of Al 2 O 3-5wt%-Ni and Al 2 O 3-5wt%-Nb powders submitted to the mechanical alloying process in a planetary ball mill for up to 40h. The morphological evolution was observed through Scanning Electron Microscopy (Field Emission Gun, SEM-FEG), energy dispersive spectrometry (EDAX) phases and particle sizes by Particulometry. It was observed that a significant micro structural change occurred in both compositions, indicating the formation of composite powders. This behavior was more intensely observed with the increase in the grinding time, obtaining composite powders with a more homogeneous and uniform structure with the time of 40 hours of MA.

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Section: Resultsmentioning

confidence: 94%

Obtaining Composites Powders of Al2 O3 / Ni and Al2 O3 / Nb by Mechanical Alloying

et al. 2019

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“…The material properties and structure was most affected by reinforcement particles [9]. Alumina and graphite reinforcement particles were used in nickel metal matrix [10,11]. The frictional wear test was carried out on nickel metal matrix and it was concluded that reinforcement particles were used to reduce the friction coefficient [12,13].…”

Section: Introductionmentioning

confidence: 99%

Material characterization and unconventional machining on synthesized Niobium metal matrix

Sivakandhan¹,

Loganathan

Murali

et al. 2020

Mater. Res. Express

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The Purpose of this work is to develop a niobium based metal matrix alloy through sintering based powder metallurgy technique. The 2, 4 and 6 weight percentage of Titanium Carbide (TiC) is added to the alloy. Various material properties such as hardness, tensile strength, impact strength and density are measured after the addition of TiC particle. The characterization, microstructure and particle size of the developed metal matrix are learnt through Scanning Electron Microscope (SEM) and Energy

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“…In ceramic processing, binders are often used to improve the strength of the green compacts and sometimes the relative density [15]. There are various organic binders which are either soluble in water or organic solvents, like PVA (polyvinylalcohol) and PEG (polyethyleneglycol), but polypropylene carbonate (PPC) was selected because it burns out completely during the sintering cycle in reducing atmosphere conditions [16]. The effects of Ni and Co particles on the microstructure and mechanical properties of sintered Al 2 O 3 ceramics was investigated.…”

Section: Introductionmentioning

confidence: 99%

Processing and mechanical characterization of Al2O3/Ni and Al2O3/C0 composites by pressureless sintering of nanocomposite powders

Kafkaslıoğlu

Yılmaz

Tür

2018

PAC

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Al 2 O 3 /Ni and Al 2 O 3 /Co nanopowder mixtures (with 3 vol.% of metallic phase) were synthesized by heterogeneous precipitation method. In order to increase the green strength, polypropylene carbonate (PPC) was used as a binder while preparing green compacts. Uniaxially pressed powder mixtures were sintered at 1550°C for 2 h in a reducing atmosphere. The effects of Ni and Co nanophases on the microstructure and mechanical properties of Al 2 O 3 ceramics were studied by X-ray diffraction, scanning electron microscopy, Vickers indentation technique and three-point bending tests. The metallic phase hindered the densification of alumina matrix, yet hardness values of Al 2 O 3 , Al 2 O 3 /Ni, and Al 2 O 3 /Co composites were comparable. Vickers fracture toughness results indicate that the composites have higher fracture toughness, but the characteristic flexural strength and Weibull modulus are higher for the pure Al 2 O 3 .

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Synthesis and Characterization of Nickel-Alumina Composites from Recycled Nickel Powder

Cited by 17 publications

References 30 publications

Obtaining Composites Powders of Al2 O3 / Ni and Al2 O3 / Nb by Mechanical Alloying

Obtaining Composites Powders of Al2 O3 / Ni and Al2 O3 / Nb by Mechanical Alloying

Material characterization and unconventional machining on synthesized Niobium metal matrix

Processing and mechanical characterization of Al2O3/Ni and Al2O3/C0 composites by pressureless sintering of nanocomposite powders

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