Synthesis of nanocrystalline hexagonal tungsten carbide via co-reduction of tungsten hexachloride and sodium carbonate with metallic magnesium

Ma, Jing; Du, Yihong

doi:10.1016/j.jallcom.2006.10.060

Cited by 30 publications

(15 citation statements)

References 19 publications

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“…On the ball wear scars lubricated by both distilled water and DNP dispersions, the Raman spectra showed no peaks between 1200 and 2000 cm −1 . The peaks at 1070 cm −1 were observed that can be attributed to stretching and bending modes of carbonate in WC ball itself (Berger et al, 2014;Ma & Du, 2008;O'Donnell, Candarlioglu, Miller, Gentleman, & Stevens, 2010). It is summarized from the Raman spectra that DNPs existed in the steel plate surfaces and did not on the WC ball surfaces after the DNP dispersion lubrication.…”

Section: Distilled Watermentioning

confidence: 96%

Tribological properties of diamond nanoparticle additive in water under a lubrication between steel plate and tungsten carbide ball

Alias

Kinoshita

Fujii

2015

JAMDSM

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We studied the effectiveness of diamond nanoparticles (DNPs) dispersed in water as a lubricant additive between stainless steel plates and sintered tungsten carbide (WC) balls. DNP dispersions with concentrations of 0.01, 0.1 and 1 wt.% were prepared and used as lubricants under a load of 1.88 N, for 240,000 friction cycles. High-friction coefficients of more than 0.3 were observed in an initial period. Then friction coefficients declined and stabilised at values of approximately 0.1. The steady-state friction coefficients were independent of the DNP concentration and lower than that for distilled water. In the initial period, wear of both the plates and ball was obvious. In the steady-state period, additional wear on the plates was a little; however, ball wear scars were clearly observed. The size of the ball wear scars decreased with decreasing the DNP concentration. It is likely that DNPs were embedded mainly in the stainless steel plates, and the embedded DNPs protected the plates and wore the balls in the steady-state period. Compared with the lubrication under distilled water, the friction coefficient and wear of the plate under the lubrication by the 0.01 wt.% DNP dispersion were lower, and the wear of the ball by this lubrication condition was not higher.

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Section: Distilled Watermentioning

confidence: 96%

Tribological properties of diamond nanoparticle additive in water under a lubrication between steel plate and tungsten carbide ball

Alias

Kinoshita

Fujii

2015

JAMDSM

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“…Tungsten carbide can be prepared by the carbothermal reduction of tungsten oxide powders using carbon black or organic carbon source [3][4][5][6][7][8] , direct carburization of tungsten powder [9][10][11] , mechanical milling [12] and gas phase or gas-solid reaction of WCl 6 [13,14] . Traditionally, commercial tungsten carbides have been made by high-temperature powder metallurgical techniques at 2 800 ℃ or carbothermal reduction of tungsten oxides with an excess of carbon above 1 400 ℃ for several hours [15] .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of tungsten carbide nanoparticles from refluxing derived precursor

Wen

Meng

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Tungsten carbide (WC) nanoparticles were fabricated from a novel refluxing-derived precursor. The precursor was prepared by acid hydrolysis of Na 2 WO 4 with concentrated HCl in water followed by refl uxing with ethanol and n-Dedocane, respectively. Then it was heat-treated to 1 200 ℃ for 2 h in vacuum to obtain WC nanoparticles. X-ray studies reveal the formation of hexagonal tungsten carbide and the grain size of 24.3 nm. SEM image shows WC nanoparticles with particle size of 20-60 nm. Long time refl uxing results in alkane dehydrogenation and coke formation. The coke is the carbon source in the carbothermal reduction reaction. The novel route of two-stage refl uxing is quite general and can be applied in the synthesis of similar carbides.

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“…Two potential reasons for these drawbacks are the type of precursor used and the choice of a liquid phase impregnation. This type of impregnation is by far the most widely used, with the most common precursor being tungsten trioxide [21], ammonium metatungstate [22] and tungsten hexachloride [23].…”

Section: Introductionmentioning

confidence: 99%

Solid-state chemistry route for supported tungsten and tungsten carbide nanoparticles

Hugot

Desforges

Fontana

et al. 2012

Journal of Solid State Chemistry

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Synthesis of nanocrystalline hexagonal tungsten carbide via co-reduction of tungsten hexachloride and sodium carbonate with metallic magnesium

Cited by 30 publications

References 19 publications

Tribological properties of diamond nanoparticle additive in water under a lubrication between steel plate and tungsten carbide ball

Tribological properties of diamond nanoparticle additive in water under a lubrication between steel plate and tungsten carbide ball

Fabrication of tungsten carbide nanoparticles from refluxing derived precursor

Solid-state chemistry route for supported tungsten and tungsten carbide nanoparticles

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