AKS doped tungsten––investigated by electrical resistivity I. Manufacturing tungsten bar and wire

Uray, L.

doi:10.1016/s0263-4368(02)00031-8

Cited by 12 publications

(2 citation statements)

References 24 publications

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“…[1][2][3] The average elastic modulus of nanocrystalline W sintered at 1700°C was 490 GPa, which is also higher than that of conventional microcrystalline W (411 GPa). 2,3 This apparent improvement in the mechanical properties of nanocrystalline W sintered at 1700°C may be related to the large number of fine and deformed tungsten grains. The reduction in the sintering temperature of W by making it nanostructured was expected from similar studies on other materials.…”

Section: Resultsmentioning

confidence: 99%

“…1 However, the consolidation of a conventional microcrystalline W powder with an average particle size of 3-4 m is difficult, [2][3][4][5] and normally electrical resistance sintering under hydrogen atmosphere at temperatures of 2500°C or more is used for this purpose. [4][5][6][7][8] The process is expensive and usually only simple shapes like filaments, rods, or bars are sintered by this method.…”

Section: Introductionmentioning

confidence: 99%

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On sinterability of nanostructured W produced by high-energy ball milling

et al. 2007

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The present investigation reports for the first time a dramatic decrease in the sintering temperature of elemental W from the conventional temperature of ജ2500°C to the modest temperature range of 1700-1790°C by making the W powder nanostructured through high-energy mechanical milling (MM) prior to sintering. The crystallite size of the initial W powder charge with a particle size of 3-4 m could be brought down to 8 nm by MM for 5 h in WC grinding media. Further milling resulted in a high level of WC contamination, which apparently was due to work hardening and the grain refinement of W. A sintered density as high as 97.4% was achieved by sintering cold, isostatically pressed nanocrystalline (8 nm) W powder at 1790°C for 900 min. The microstructure of the sintered rods showed the presence of deformation bands, but no cracks, within a large number of W grains. The mechanical properties, when compared with the hardness and elastic modulus, of the sintered nano-W specimen were somewhat superior to those reported for the conventional sintered W.

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