Effect of heating mode on sintering of tungsten

Mondal, Avijit; Upadhyaya, Anish; Agrawal, Dinesh Kumar

doi:10.1016/j.ijrmhm.2010.05.002

Cited by 51 publications

(16 citation statements)

References 11 publications

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“…Fig. 7 compares the hardness values of the 48 h-sintered composite from this study with those of sintered products reported in the literatures by Mondal et al [27] and Park et al [20]. Pure tungsten sintered at 1800°C shows a hardness value of 412 Hv.…”

Section: Resultsmentioning

confidence: 53%

Fabrication of tungsten-based composites by solid binder mixing and sintering

Suh

Shin

2015

Powder Technology

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Section: Resultsmentioning

confidence: 53%

Fabrication of tungsten-based composites by solid binder mixing and sintering

Suh

Shin

2015

Powder Technology

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“…The variation in the tungsten grain size is attributable to heating rate, holding time and the peak temperature of the process. The sintering process with a higher heating rate, lower holding time and higher cooling rate may lead to refined tungsten grain size [50,51]. The microwave sintering with a higher heating rate (20 • C per min) than conventional sintering (5 • C per min) has shown finer tungsten grain size (33 µm).…”

Section: Analysis Of Bulk Whhea Consolidated By Sinteringmentioning

confidence: 99%

Tungsten Matrix Composite Reinforced with CoCrFeMnNi High-Entropy Alloy: Impact of Processing Routes on Microstructure and Mechanical Properties

Satyanarayana

Sokkalingam

Jena

et al. 2019

Metals

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Tungsten heavy alloy composite was developed by using novel CoCrFeMnNi high-entropy alloy as the binder/reinforcement phase. Elemental tungsten (W) powder and mechanically alloyed CoCrFeMnNi high-entropy alloy were mixed gently in high energy ball mill and consolidated using different sintering process with varying heating rate (in trend of conventional sintering < microwave sintering < spark plasma sintering). Mechanically alloyed CoCrFeMnNi high-entropy alloy have shown a predominant face-centered cubic (fcc) phase with minor Cr-rich σ-phase. Consolidated tungsten heavy high-entropy alloys (WHHEA) composites reveal the presence of Cr–Mn-rich oxide phase in addition to W-grains and high-entropy alloys (HEA) phase. An increase in heating rate restricts the tungsten grain growth with reduces the volume fraction of the Cr–Mn-rich phase. Finally, spark plasma sintering with a higher heating rate and shorter sintering time has revealed higher compressive strength (~2041 MPa) than the other two competitors (microwave sintering: ~1962 MPa and conventional sintering: ~1758 MPa), which may be attributed to finer W-grains and reduced fraction of Cr–Mn rich oxide phase.

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“…The heavy alloys find application as counterweights, radiation shields, rotating inertia members like gyroscopes, semiconductor substrates, collimators, machining tools, kinetic energy penetrators, and fragmentation devices in defense [ 20 ]. Pure tungsten requires a very high sintering temperature, in the range of 1600 to 2000 °C, depending upon the tungsten particle size and the sintering method to get fully densified [ 21 , 22 , 23 ]. To overcome this difficulty in sintering and to introduce a ductile phase into the alloy, elements with a lower melting point and having preferably good solubility with tungsten are mixed with the base metal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare Earth Metals (Y, La) and Refractory Metals (Mo, Ta, Re) to Improve the Mechanical Properties of W–Ni–Fe Alloy—A Review

et al. 2021

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Tungsten heavy alloys are two-phase metal matrix composites that include W–Ni–Fe and W–Ni–Cu. The significant feature of these alloys is their ability to acquire both strength and ductility. In order to improve the mechanical properties of the basic alloy and to limit or avoid the need for post-processing techniques, other elements are doped with the alloy and performance studies are carried out. This work focuses on the developments through the years in improving the performance of the classical tungsten heavy alloy of W–Ni–Fe through doping of other elements. The influence of the percentage addition of rare earth elements of yttrium, lanthanum, and their oxides and refractory metals such as rhenium, tantalum, and molybdenum on the mechanical properties of the heavy alloy is critically analyzed. Based on the microstructural and property evaluation, the effects of adding the elements at various proportions are discussed. The addition of molybdenum and rhenium to the heavy alloy gives good strength and ductility. The oxides of yttrium, when added in a small quantity, help to reduce the tungsten’s grain size and obtain good tensile and compressive strengths at high temperatures.

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Effect of heating mode on sintering of tungsten

Cited by 51 publications

References 11 publications

Fabrication of tungsten-based composites by solid binder mixing and sintering

Fabrication of tungsten-based composites by solid binder mixing and sintering

Tungsten Matrix Composite Reinforced with CoCrFeMnNi High-Entropy Alloy: Impact of Processing Routes on Microstructure and Mechanical Properties

Effect of Rare Earth Metals (Y, La) and Refractory Metals (Mo, Ta, Re) to Improve the Mechanical Properties of W–Ni–Fe Alloy—A Review

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