Spark plasma sintering of submicron-sized Cu-powder—Influence of processing parameters and powder oxidization on microstructure and mechanical properties

Ritasalo, Riina; Cura, M. Erkin; Liu, X.W.; Söderberg, Outi; Ritvonen, Tapio; Hannula, Simo Pekka

doi:10.1016/j.msea.2010.01.008

Cited by 27 publications

(19 citation statements)

References 20 publications

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“…This evolution along the length of the specimen, less pronounced for SG than for SWC, could reflect a variation in copper grain size due to differences in the actual temperature reached in different parts of the sample, the parts with a lower grain size showing a higher microhardness. The average microhardness values, higher for SG (about 1.26 GPa) than for SWC (about 1.11 GPa), are in line with values reported by other authors [18,19] for SPS copper samples with a grain size in the range 0.4-0.7 lm. The stress-strain curves are reported in Fig.…”

Section: Resultssupporting

confidence: 92%

Dog-bone copper specimens prepared by one-step spark plasma sintering

et al. 2015

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Section: Resultssupporting

confidence: 92%

Dog-bone copper specimens prepared by one-step spark plasma sintering

et al. 2015

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“…Such systems were studied and already reported in several papers [3][4][5]9,10,12], including sintering by SPS, and the results were consistently confirmed. Also compaction of Cu or Cu-based powder mixtures by means of SPS technique has been studied at least several times, using different grain size powders and various sintering conditions [2,13,14].…”

Section: Tib2-cu Cermets Produced By Liquid Phase Sintering Using Spamentioning

confidence: 99%

“…The SPS technique is recently considered as very attractive method to produce cermets [12], which is caused by its unique combination of parameters, such as essentially short sintering time [3,14], resistive heating of the sintered powder with an electrical current and simultaneous uniaxial pressure [2,12,13]. Such conditions are favorable, especially in the technology of nanocomposites, because the grain growth is strongly limited by short sintering time [12,14].…”

Section: Tib2-cu Cermets Produced By Liquid Phase Sintering Using Spamentioning

confidence: 99%

“…Taking into consideration low temperature of consolidation, the effect of oxide impurities on the sintering ability of Cu was also the subject of reported studies at 600 °C [13] when intentionally oxidized Cu seemed not to have marked effect on the SPS consolidation process. The reasons of such behavior can be attributed to similar melting point of Cu and its oxide (1083 °C and 1220 °C, respectively), or good wettability of Cu2O by liquid copper.…”

Section: Effect Of Contaminations On the Densification Of Tib2mentioning

confidence: 99%

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Vaporization and Poor Wettability as the Main Challenges in Fabrication of TiB2-Cu Cermets Studied by SPS

Ziemnicka-Sylwester

2014

Metals

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TiB2-Cu cermets with various volume fractions of copper (from 3 to 30 vol. %) were produced via liquid phase sintering at the temperature range 1100-1200 °C in vacuum using spark plasma sintering (SPS) technique. Full densification could not be achieved as the consequence of poor wettability and vaporizing Cu. The quantitative Rietveld analysis indicated that insignificant reduction in Cu content occurred only in sample with initially 3 vol. % of Cu, but then densification was negligible. The relative density improved along with increasing volume content of Cu (10-20 vol. %), but then predominant amount of Cu introduced was reduced as the effect of vaporization or swelling, which caused that pellet with intended 20 or 30 vol. % of Cu contained respectively only 6 or 17 vol. % after sintering. Moreover, Cu droplets were released from the die at the temperature of 1000-1030 °C near the Cu melting point. The effect of vaporization was successfully reduced by increased heating rate and when isothermal annealing process was skipped, however, it could not be entirely eliminated. The experimental results on Cu vaporization are confronted with parameters that are commonly considered in the production of cermets, such as oxidation, wettability, contact angle and viscosity as well as their impact on densification.

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“…At the same time, there has been a growing interest in the use of spark plasma sintering (SPS) to fabricate metals, composites and especially ceramics [12][13][14] . The biggest advantage of SPS is that the dense sintering can be completed in a short time without signifi cant grain growth.…”

Section: Introductionmentioning

confidence: 99%

Two-step synthesis of TiC0.7N0.3@WC-MoC2 core-shell microspheres and fabrication of TiC0.7N0.3@WC-MoC2-based cermets by SPS

Liu

Jin

et al. 2011

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

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The precursor with TiC 0.7 N 0.3 @WO 3 -MO 3 microspheres were prepared by a novel method from the WO 3 -MoO 3 sol dipping. Subsequently, TiC 0.7 N 0.3 @WC-MoC 2 core-shell structural microspheres were successfully obtained by carburizing the precursor at 900 °C in a fl owing mixture of CH 4 (20 ml min -1 ) and H 2 (200 ml min -1 ) for 2 h. Then TiC 0.7 N 0.3 @WC-MoC 2 -15Co cermets were prepared utilizing the core-shell powders by spark plasma sintering (SPS). Powders of the precursors with TiC 0.7 N 0.3 @WO 3 -MO 3 microspheres, TiC 0.7 N 0.3 @WC-MoC 2 microspheres and TiC 0.7 N 0.3 @WC-MoC 2 -15Co cermets were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The obtained TiC 0.7 N 0.3 @WC-MoC 2 microspheres have a dense WC-MoC 2 coatings shell. The thickness of the shell could be easily controlled by adjusting the number of sol dipping cycles. It was found that the TiC0.7N 0.3 @WC-MoC 2 microspheres were more benefi cial to fabricate the "core-rim" structures by SPS.

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Spark plasma sintering of submicron-sized Cu-powder—Influence of processing parameters and powder oxidization on microstructure and mechanical properties

Cited by 27 publications

References 20 publications

Dog-bone copper specimens prepared by one-step spark plasma sintering

Dog-bone copper specimens prepared by one-step spark plasma sintering

Vaporization and Poor Wettability as the Main Challenges in Fabrication of TiB2-Cu Cermets Studied by SPS

Two-step synthesis of TiC0.7N0.3@WC-MoC2 core-shell microspheres and fabrication of TiC0.7N0.3@WC-MoC2-based cermets by SPS

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