Effect of thermal plasma heating on the dielectric properties of Al–Zr composites

Sahu, D. R.; Roul, B K; Singh, Saroj Kumar; Chaudhury, Rahul

doi:10.1243/146442002320139324

Cited by 2 publications

(4 citation statements)

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“…As such, pure Al 2 O 3 shows higher hardness when compared with pure ZrO 2 -sintered pellets. However, different composites (varying x in Al x -Zr 1002x ) showed different hardness values, as observed for both plasmaand conventionally-sintered samples [16,17] with varying processing conditions. Hardness values of conventionally-sintered samples were measured for different sintering temperatures and times.…”

Section: Resultsmentioning

confidence: 62%

“…As discussed earlier, a new technology suitable to overcome several restrictions of the conventional sintering is sintering in the atmosphere of different thermal plasma conditions. There has been considerable interest in plasma sintering of oxide ceramics, especially for Al -Zr oxide composites [12][13][14][15][16]. This is due to the fact that the high energy density obtainable in a plasma reactor and the low gas throughout allow the construction of a portable unit with rapid startup and shutdown capabilities, combined with reduced exhaust handling requirements.…”

Section: Introductionmentioning

confidence: 99%

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Extended arc thermal plasma assisted sintering of Al-Zr oxide composites

Ray

Sahu

Mishra

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part L:

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An inexpensive and simple sintering technique using an extended arc thermal plasma assisted heating (EATPAH) source has been designed and fabricated for rapid sintering of Al x -Zr 1002x (x ¼ 0, 10, 20, . . . , 100) oxide composites. High heat and mass transfer kinetics of thermal plasma assisted heating allows quick densification within a few minutes when compared with conventional heating source that takes tens of hours for identical densification. Sintering parameters such as sintering time, plasma power and plasmagen gas flowrate, and initial green density of composites are critically optimized. The green powder compacts sintered at a higher heating rate produced a sample with higher density and fine grain microstructure, whereas abnormal grain growth and lower density result at lower heating rate. This reveals that rapid sintering by EATPAH is effective for promoting the physical densification of the sintered end product. Hardness of the sintered products is studied to understand the density and shrinkage behaviour during plasma sintering. It is observed that highly dense sintered product with greater hardness and homogeneous phase distribution can be prepared within a few minutes by low cost EATPAH technique.

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Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Extended arc thermal plasma assisted sintering of Al-Zr oxide composites

Ray

Sahu

Mishra

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part L:

Self Cite

View full text Add to dashboard Cite

show abstract

“…Approximate sizes (1 cm diameter) of the pellets were of the order of 2 mm thickness. Pellets were sintered to high density using our thermal plasma assisted sintering set-up [14,15].…”

Section: Methodsmentioning

confidence: 99%

“…1; a 30 kW DC power supply unit is used for making an extended arc thermal plasma reactor. Details of the thermal plasma assisted sintering set-up are described elsewhere [14,15]. A water-cooled stainless-steel double wall cylindrical chamber (outer) is fixed with suitable thermal insulation by bubble alumina for the confinement of plasma heat.…”

Section: Methodsmentioning

confidence: 99%