Superconducting composites of MgB2 with Additions obtained by Spark Plasma Sintering

2012 ◽  
Vol 1454 ◽  
pp. 115-121
Author(s):  
P. Badica ◽  
G. Aldica ◽  
M. Burdusel
Keyword(s):  
Critical Current Density ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
Irreversibility Field ◽  
Metal Powders ◽  
Secondary Phases ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
High Fields ◽  
Composite Samples

ABSTRACTSb2O3, Sb-metal, Bi2O3 or Bi-metal, powders were mixed with MgB2 powder. Starting compositions were ((MgB2)(M2O3)x, x = 0.0025, 0.005, 0.015, and (MgB2)(M)y, y = 0.01, M = Sb, Bi. Mixtures were processed by Spark Plasma Sintering (SPS) technique. As obtained composite samples show high density, above 94% of the theoretical density. While the secondary phases indicate on similar reactions, samples show different behavior vs. addition type and amount. This does not directly correlate with the melting temperature of the addition. From the critical current density (Jc) and irreversibility field (Hirr) enhancement viewpoints, optimum additions are oxides for x=0.025, 0.005. Both oxides are improving Jc at high fields, but Sb2O3 is effective up to 10 K, while Bi2O3 is up to 30 K. Metal additions are decreasing Jc and Hirr when compared to pristine MgB2sample.

scholarly journals Improvement of critical current density of MgB 2 bulk superconductor processed by Spark Plasma Sintering

2020 ◽  
Vol 103 (11) ◽  
pp. 6169-6175
Author(s):  
Jacques G. Noudem ◽  
Yiteng Xing ◽  
Pierre Bernstein ◽  
Richard Retoux ◽  
Masaki Higuchi ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
Bulk Superconductor ◽  
Plasma Sintering ◽  
Spark Plasma

Synthesis of CaKFe4As4 bulk samples with high critical current density using a spark plasma sintering technique

2020 ◽  
Vol 33 (9) ◽  
pp. 094005
Author(s):  
Shigeyuki Ishida ◽  
S Pavan Kumar Naik ◽  
Yoshinori Tsuchiya ◽  
Yasunori Mawatari ◽  
Yoshiyuki Yoshida ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
High Critical Current Density ◽  
Plasma Sintering ◽  
Spark Plasma

Insertion versus Growth of Magnetic Nanoparticles in MgB2 Superconducting Composites

2014 ◽  
Vol 941-944 ◽  
pp. 458-461
Author(s):  
Viorel Sandu ◽  
Gheorghe Aldica ◽  
Petre Badica ◽  
Andrei Kuncser ◽  
Yuichiro Hayasaka
Keyword(s):  
Magnetic Nanoparticles ◽  
Critical Current Density ◽  
Critical Current ◽  
Spark Plasma Sintering ◽  
Current Density ◽  
Magnetic Interaction ◽  
Flux Lines ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Organic Precursors

MgB2-based superconducting composites with magnetic nanoparticles were fabricated by spark plasma sintering technique. Two methods have been used to create nanoparticles within MgB2 matrix: i) direct insertion of passivated magnetic nanoparticles; ii) growth of magnetic nanoparticles by thermolysis of polymers or metallo-organic precursors. These composites display an enhanced critical current density due to the additional magnetic pinning generated by the magnetic interaction with the flux lines.

scholarly journals Effect of Load on the Tribological Properties of Eutectic Al-Si Reinforced n-Al2O3 under Dry Sliding Conditions

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Pranav Dev Srivyas ◽  
M.S. Charoo
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Spark Plasma Sintering ◽  
Tribological Properties ◽  
High Load ◽  
Dry Sliding ◽  
Advanced Composite ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Composite Samples

Advanced composites are the materials of the new generation. Hence, the focus of the study is to determine the tribological properties of the eutectic Al-Si alloy reinforced with (2, 4, 6, 8, and10 wt. %) of n-Al2O3 against chrome-plated steel ball under dry sliding conditions. The novelty of this work is the fabrication of the composite sample with this elemental composition, which is not done before. Spark plasma sintering (SPS) nonconventional fabrication method is used to fabricate advanced composite samples. Friction coefficient (COF) and wear rate of the composite samples were studied under high load, varying from 50 N to 300 N, using the ball-on-disc tribometer configuration, with other parameters such as stroke, frequency, sliding distance, and sliding velocity remaining constant at 2 mm, 30 Hz, 120 meter, and 0.120 m/s, respectively. Reduction in wear volume for the advanced composite was reported in the range 15.45–44.58% compared to the base alloy (eutectic Al-Si alloy). An increase in friction coefficient was reported in the range 28.80–35.65% compared to the base matrix alloy material. It was also reported that the wear rate increases and the friction coefficient of the composite sample decreases with an increase in load for the tribo-pair. It was observed that an increase in the wt. % of reinforcement influences the friction and wear behavior of the composite. Wear mechanism at high load was characterized by plastic deformation, adhesion, delamination, and abrasion wear. For pre- and postcharacterization of surface and worn tracks, scanning electron microscopy (SEM) electron dispersion spectroscopy (EDS), 3D surface profilometer, and optical microscopy were used. This work aimed to investigate the influence of load on the tribological properties of Al-Si eutectic reinforced n-Al2O3 under dry sliding conditions. Its main objective was to provide a new contribution to the tribological behavior of these composites fabricated using the nonconventional spark plasma sintering method.

Synthesis of Bulk Quasicrystals by Spark Plasma Sintering

2000 ◽  
Vol 643 ◽  
Author(s):  
E. Fleury ◽  
J.H. Lee ◽  
S.H. Kim ◽  
G.S. Song ◽  
J.S. Kim ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Spark Plasma Sintering ◽  
Vickers Microhardness ◽  
Secondary Phases ◽  
Hot Press ◽  
Plasma Sintering ◽  
Short Period ◽  
Spark Plasma ◽  
Powder Particles ◽  
Sintering Method

AbstractSpark plasma sintering method was applied to Al-Cu-Fe and Al-Si-Cu-Fe gas-atomized powders to prepare almost pore-free cylindrical specimens with icosahedral and 1/1 cubic approximant phases, respectively. This investigation has revealed that a high density could be obtained despite the short period and low temperature imposed during spark plasma sintering. In comparison to hot press technique, these conditions are favorable since they limit the formation of secondary phases and avoid exaggerated grain growth. The Vickers microhardness and fracture toughness of these two alloy systems were found to be larger than those obtained from cast and hot pressed samples, which could be attributed to a strong bonding between powder particles and the small-grained microstructure of the bulk SPS quasicrystalline specimens.

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