Enhanced liquid-phase sintering of W–Cu composites by liquid infiltration

Hafed, Ibrahim; Aziz, Azizan; Rahmat, Azmi

doi:10.1016/j.ijrmhm.2013.12.004

Cited by 61 publications

(25 citation statements)

References 28 publications

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“…W-Cu materials are of a major interest for thermal-electrical applications like electrical contacts used in low voltage (LV), medium voltage (MV) and high voltage (HV) switching devices working in vacuum, sulfur hexafluoride (SF 6 ) gas or oil [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Development and Investigation of Tungsten Copper Sintered Parts for Using in Medium and High Voltage Switching Devices

Lungu¹,

Lucaci²,

Tsakiris³

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Section: Introductionmentioning

confidence: 99%

Development and Investigation of Tungsten Copper Sintered Parts for Using in Medium and High Voltage Switching Devices

Lungu¹,

Lucaci²,

Tsakiris³

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…When W content increase, the resistance to wear and arc erosion will increase but the thermal and electrical conductivity will reduce due to Cu content decrease. W-Cu composites have good mechanical properties and high resistance to contact wear, welding, and melting at high currents and voltages [1,[3][4][5][6][7][8][9][10][11][12][13][14]. These superior properties recommend W-Cu composites as arcing contacts in medium and high voltage circuit breakers operating at high contact pressures in SF 6 gas or mineral oil.…”

Section: Introductionmentioning

confidence: 99%

“…% ultrafine or fine particles of W, and balance is composed of Cu and up to 1…3 wt. % sintering activator (Ni, Fe, Co, or other transition element) [3][4][5][6][7][8]14]. Pressing, sintering, and infiltration (PSI) technique is one of the common techniques used for manufacturing W-Cu composites containing over 50 wt.…”

Section: Introductionmentioning

confidence: 99%

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Tribological Behavior of Arcing Contact Materials Based on Copper Infiltrated Tungsten Composites

Lungu

Enescu

Lucaci

et al. 2017

Proccedings of International Scientific Conference "BALTTRIB 2017"

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Tungsten copper composites with 70±3 wt.% W, maximum 1.5 wt.% Ni, and balance Cu were achieved as disks (diameter × height of 50×6 mm) by copper infiltration process of tungsten skeletons. Elemental analysis was assessed by WDXRF spectroscopy. Hydrostatic density was evaluated in ethanol. Vickers hardness and Young's modulus were determined in ambient air by instrumented indentation technique and Oliver&Pharr computation method. Tribological behavior was investigated under 30 N up to 400 m sliding distance and naphthenic mineral oil lubricant with a standard tribometer of ball-on-disk type. The results yielded highly dense materials with relative density over 96%, Vickers hardness (HV IT ) of 244…323, Young's modulus (E IT ) of 156…185 GPa, mean coefficient of friction of 0.11…0.22 and specific wear rate up to 8×10 -6 mm 3 /(Nm). The developed composites with low coefficient of friction and high wear resistance for use as arcing contacts in oil circuit breakers will endow high performance in service.

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“…[1] [9]- [12]. WCu composites that have a high volume fraction of W (80% -95%) are used for electronic packages while those with medium volume fractions of W (50% -75%) are mostly used in electrical contact materials and military applications [13].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Sintering Temperature on the Densification of Mechanically Alloyed W-Brass Composites

Gowon¹,

Mohammed²,

Jamaluddin³

et al. 2015

OJMetal

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Prealloyed (PA) and premixed (PM) W-brass with the composition of 60 wt% W, 1 wt% Ni and 39 wt% brass was sintered at the temperature of 800˚C, 920˚C and 1000˚C each. As a result of difficulties in the densification of W-Cu and W-Cu alloys, mechanical alloying (MA) and activated sintering were combined. The powders were mechanically alloyed for 13 hours to produce nanosized W grains embedded in brass. The microstructure and properties of these composites with increase in sintering temperature has been studied. Both prealloyed and premixed composites sintered at 800˚C (solid state sintering) and 920˚C (sub-solidus state sintering) have lower sintered densities and hardness. The densification rate in the premixed composites was observed to be higher than that of the prealloyed composites. Their densification and properties increased with the increase in the sintering temperature. Premixed composite sintered at 1000˚C had 91.0% sintered density, 180 Hv microhardness against 76.0% and 133 Hv respectively for prealloyed composite at the same temperature. The values of electrical conductivity in both prealloyed and premixed composites increased with increase in temperature.

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Enhanced liquid-phase sintering of W–Cu composites by liquid infiltration

Cited by 61 publications

References 28 publications

Development and Investigation of Tungsten Copper Sintered Parts for Using in Medium and High Voltage Switching Devices

Development and Investigation of Tungsten Copper Sintered Parts for Using in Medium and High Voltage Switching Devices

Tribological Behavior of Arcing Contact Materials Based on Copper Infiltrated Tungsten Composites

The Effects of Sintering Temperature on the Densification of Mechanically Alloyed W-Brass Composites

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