Bulk superconductors textured and densified by Spark Plasma Sintering

2015 ◽  
Vol 1807 ◽  
pp. 7-10 ◽  
Author(s):  
J. G. Noudem ◽  
L. Dupont ◽  
P. Bernstein
Keyword(s):  
Spark Plasma Sintering ◽  
Crystallographic Orientation ◽  
Magnetic Levitation ◽  
Bulk Material ◽  
Field Measurements ◽  
Force Measurements ◽  
Bulk Superconductors ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The One

ABSTRACTIn this contribution, we report progress in the preparation of superconducting materials made by Spark Plasma Sintering (SPS). On the one hand, the fabrication process was optimized in order to improve the texturing of Bi2Ca2Sr2CuO8 superconductor ceramics. The new process is referred to as “Spark Plasma Texturing” (SPT). During SPT, the bulk material is free to deform itself. As a result, an inter-grain preferential crystallographic orientation is generated, while materials processed by conventional SPS are usually quasi-isotropic. The crystallographic orientation causes a strong anisotropy in the magnetic properties of the Bi2Ca2Sr2CuO8 bulk.On the other hand, superconducting MgB2 discs were consolidated using the rapid SPS process. MgB2 has not been yet been seriously considered as a superconductor that could be used for magnetic levitation. Here we present trapped field measurements as a function of the distance to the superconductor and field cooled levitation force measurements that suggests that it presents interesting characteristics for this application.

Improved thermoelectric properties of PEDOT:PSS polymer bulk prepared using spark plasma sintering

2018 ◽  
Vol 54 (19) ◽  
pp. 2429-2431 ◽  
Author(s):  
Zhen-Hua Ge ◽  
Yi Chang ◽  
Fu Li ◽  
Jingting Luo ◽  
Ping Fan
Keyword(s):  
Spark Plasma Sintering ◽  
Thermoelectric Properties ◽  
Bulk Material ◽  
Low Density ◽  
Inorganic Nanoparticle ◽  
Polymer Bulk ◽  
Plasma Sintering ◽  
Spark Plasma

A low-density PEDOT:PSS/inorganic nanoparticle composite bulk material was prepared by carrying out spark plasma sintering (SPS) at 100 °C.

High temperature microstructure and microhardness evolution in dense NiCrAlY bulk material fabricated by spark plasma sintering

2011 ◽  
Vol 528 (7-8) ◽  
pp. 3210-3217 ◽  
Author(s):  
Jianrong Song ◽  
Kaka Ma ◽  
Ying Li ◽  
Lianmeng Zhang ◽  
Julie M. Schoenung
Keyword(s):  
High Temperature ◽  
Spark Plasma Sintering ◽  
Bulk Material ◽  
Plasma Sintering ◽  
Spark Plasma

Solid-State Synthesis of Magnesium Silicide via Repeated Plastic Working and Spark Plasma Sintering

2005 ◽  
Vol 475-479 ◽  
pp. 2895-2898
Author(s):  
Hideki Oginuma ◽  
Katsuyoshi Kondoh ◽  
Takashi Yamaguchi ◽  
Eiji Yuasa
Keyword(s):  
Solid State ◽  
Spark Plasma Sintering ◽  
Bulk Material ◽  
Magnesium Silicide ◽  
X Ray Diffraction ◽  
Plastic Working ◽  
X Ray ◽  
Plasma Sintering ◽  
Elemental Powder Mixture ◽  
Spark Plasma

In this study, the solid-state reaction to form Mg2Si bulky materials via spark plasma sintering (SPS) process was discussed. Elemental powder mixture of Mg-33.33mol%Si was refined and consolidated as green compacts by repeated plastic working (RPW) SPS was performed to synthesize and sinter magnesium silicide at 1100K from the RPWed compact. The only peaks of Mg2Si, not Mg and Si, were detected by X-ray diffraction analysis. Mg2Si bulky intermetallic began to shrink above 800K during SPS process, and its densification significantly occurred. The density of SPSed Mg2Si bulk material is about 100% of the theoretically relative one.

Structures and magnetic properties of Sm-Fe-N bulk magnets produced by the spark plasma sintering method

2007 ◽  
Vol 22 (11) ◽  
pp. 3130-3136 ◽  
Author(s):  
Tetsuji Saito
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Bulk Material ◽  
Decomposition Temperature ◽  
High Coercivity ◽  
Bulk Materials ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method ◽  
N Powder

Sm-Fe-N powders were successfully consolidated at 873 K and below by the spark plasma sintering (SPS) method. Although the decomposition temperature of the hard magnetic Sm2Fe17N3 phase has been reported to be 873 K, partial decomposition of the Sm2Fe17N3 phase was noted in the bulk materials obtained by sintering at below that temperature. The resultant bulk materials showed a coercivity of around 0.24 MAm−1, significantly lower than that of the original Sm-Fe-N powder. It was found that decomposition of the Sm2Fe17N3 phase in the SPS method was significantly lowered by the addition of a small amount of Zn powder to the Sm-Fe-N powder. The bulk material obtained by sintering a mixture of Sm-Fe-N and Zn powder (10%Zn) at 723 K exhibited high coercivity, comparable with that of the original Sm-Fe-N powder.

scholarly journals Unburned Carbon Behavior in Sintered Coal Fly-Ash Bulk Material by Spark Plasma Sintering

2007 ◽  
Vol 48 (12) ◽  
pp. 3062-3065 ◽  
Author(s):  
Kazuhiro Hasezaki ◽  
Akifumi Nakashita ◽  
Gen-yo Kaneko ◽  
Hideaki Kakuda
Keyword(s):  
Fly Ash ◽  
Spark Plasma Sintering ◽  
Bulk Material ◽  
Coal Fly Ash ◽  
Unburned Carbon ◽  
Plasma Sintering ◽  
Spark Plasma

Dense pure binderless WC bulk material prepared by spark plasma sintering

2015 ◽  
Vol 31 (14) ◽  
pp. 1749-1756 ◽  
Author(s):  
S. K. Li ◽  
J. Q. Li ◽  
Y. Li ◽  
F. S. Liu ◽  
W. Q. Ao
Keyword(s):  
Spark Plasma Sintering ◽  
Bulk Material ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Synthesis of Dense MgB2 Superconductor via In Situ and Ex Situ Spark Plasma Sintering Method

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7395
Author(s):  
Joseph Longji Dadiel ◽  
Sugali Pavan Kumar Naik ◽  
Paweł Pęczkowski ◽  
Jun Sugiyama ◽  
Hiraku Ogino ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Microstructural Characterization ◽  
Ex Situ ◽  
Synthesis Methods ◽  
Mgb2 Bulk ◽  
Bulk Superconductors ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Conditions

In this study, high-density magnesium diboride (MgB2) bulk superconductors were synthesized by spark plasma sintering (SPS) under pressure to improve the field dependence of the critical current density (Jc-B) in MgB2 bulk superconductors. We investigated the relationship between sintering conditions (temperature and time) and Jc-B using two methods, ex situ (sintering MgB2 synthesized powder) and in situ (reaction sintering of Mg and B powder), respectively. As a result, we found that higher density with suppressed particle growth and suppression of the formation of coarse particles of MgB4 and MgO were found to be effective in improving the Jc-B characteristics. In the ex situ method, the degradation of MgB2 due to pyrolysis was more severe at temperatures higher than 850 °C. The sample that underwent SPS treatment for a short time at 850 °C showed higher density and less impurity phase in the bulk, which improved the Jc-B properties. In addition, the in situ method showed very minimal impurity with a corresponding improvement in density and Jc-B characteristics for the sample optimized at 750 °C. Microstructural characterization and flux pinning (fP) analysis revealed the possibility of refined MgO inclusions and MgB4 phase as new pinning centers, which greatly contributed to the Jc-B properties. The contributions of the sintering conditions on fP for both synthesis methods were analyzed.

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