Fabrication of ultrafine tungsten-based alloy powders by novel soda reduction process

Lee, Dongwon; Turaev, Farkhod R.; Kim, Ju-Hyeong; Yang, Mingchuan

doi:10.1016/j.materresbull.2009.12.005

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…There are several conventional methods for fabrication of tungsten heavy alloys, including mechanical alloying [9][10][11], electro-deposition technique [12,13], metal injection molding [10] and spray drying [14][15][16]. L. Dong-Won et al [16] studied a novel reduction method to fabricate ultrafine tungsten heavy alloy powders, using cost effective source materials. The advantages of mechanical alloying method have the simple equipment and process and easy operation that make it suitable for mass produc-tion.…”

Section: Introductionmentioning

confidence: 99%

“…Using fine powder raw materials and/or novel techniques to prepare fine-or ultrafine-grained WHA's are the current trends. Fine-or ultrafine grained WHA's are usually prepared via sintering ultrafine/nano tungsten composite powders and controlling the growth of the tungsten grains [10,[15][16][17][18][19][20][21]. By refining the microstructure of the tungsten heavy alloys, the mechanical properties can be improved.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characterization of Tungsten Heavy Alloys Using Chemical Reduction and Mechanical Alloying Methods

Hamid¹,

Moustafa²,

Daoush³

et al. 2013

OJAppS

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A novel reduction technique has been developed to synthesize nano-sized tungsten heavy alloys powders and compared with the same powders processed by mechanical alloying technique. In the first method, nano-sized tungsten heavy alloys powders have been obtained by reduction of precursors obtained by spray drying of several appropriate aqueous solutions, which were made from salts containing tungsten, cobalt, and nickel. By adjusting the stoichiometry of the component of the solutions, it is possible to obtain the desired chemical composition of the tungsten heavy alloys powders. In the second method, highly pure elemental powders of tungsten heavy alloys have been mechanically alloyed in a tumbler ball mill for different milling time. The investigated tungsten heavy alloy powders with the composition (95%W-3.5%Ni-1.5%Fe), (93%W-4.5%Ni-1.0%Fe-1.5%Co), and (90%W-6%Ni-4%Cu) have been prepared using both methods. The prepared powders have been compacted at 70 bar (200 MPa) and sintered in vacuum furnace at 1400˚C. Vacuum sintering was carried out to achieve full densification of the produced tungsten heavy alloys. The investigated materials were going to be evaluated the physical and mechanical properties of the sintered parts such as density; electrical conductivity, hardness, and transverse rupture strength. The results reveal that, the grain size of alloys fabricated by chemical reduction technique (53.1-63.8 nm) is smaller than that fabricated by mechanical alloying technique (56.4-71.4 nm).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Tungsten Heavy Alloys Using Chemical Reduction and Mechanical Alloying Methods

Hamid¹,

Moustafa²,

Daoush³

et al. 2013

OJAppS

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“…Recently, some wet-chemical methods such as soda reduction process and sol-spray-drying process have been tried to synthesize W-Ni-Fe composite powders with high purity and excellent sinterability [6,7]. Nowadays, a new chemical process, the glycine-nitrate process (GNP) has been widely investigated in preparing ceramic powders with nanosize particles [8].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ultrafine Tungsten-Based Alloy Powders by GNP-Reduction Method

Wan

Cheng

Jiang

et al. 2011

AMR

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A novel glycine-nitrate process (GNP)-reduction method has been developed to fabricate ultrafine tungsten heavy alloy powders, with ammonium metatungstate (AMT), iron nitrate nonahydrate (Fe (NO3)3·9H2O), nickel nitrate hexahydrate (Ni (NO3)2·6H2O) as raw materials and gylcine as a complexant and incendiary agent. Precursor powders were obtained by self-propagation reaction in a suspension containing above materials. The precursor powders were then hydrogen-reduced to obtain composite powders with 90W-7Ni-3Fe composition (wt.%). Phase constitution and morphology of the precursor powders and the reduced powders were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Chemical composition of resultant powders was analyzed by energy dispersive spectrometer (EDS) analysis. It was shown that the GNP-reduction method produces ultrafine 90W-7Ni-3Fe powders with particle size of about 200 nm and highly dispersion of the composition.

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Fabrication of Ultrafine Tungsten-based Composite Powders by Novel Reduction Process

Lee¹

2012

j. Korean Powder Metall. Inst.

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Fabrication of ultrafine tungsten-based alloy powders by novel soda reduction process

Cited by 3 publications

References 12 publications

Fabrication and Characterization of Tungsten Heavy Alloys Using Chemical Reduction and Mechanical Alloying Methods

Fabrication and Characterization of Tungsten Heavy Alloys Using Chemical Reduction and Mechanical Alloying Methods

Preparation of Ultrafine Tungsten-Based Alloy Powders by GNP-Reduction Method

Fabrication of Ultrafine Tungsten-based Composite Powders by Novel Reduction Process

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