Study on the High Speed Jet-Electrode Position Ni-P Alloy

2013 ◽  
Vol 567 ◽  
pp. 39-44
Author(s):  
Ying Wang ◽  
Min Kang ◽  
Yong Yang ◽  
Xiu Qing Fu
Keyword(s):  
Grain Size ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Speed ◽  
Electrode Position ◽  
Stirring Intensity

The high speed jet-electrodepositing equipment was used to prepare Ni-P alloy in substrate of 45 steel. The influences of current density on depositing rate, hardness of deposit and microstructure of Ni-P alloy were studied, and the comparation with that of conventional electroplating were studied. The results show that with the increase of stirring intensity of the electrolyte, the thickness of diffused layer decreases, the critical current density increases, and then the depositing rates increase to 69.82/min. A linear increasing of the depositing rate with the increase of current density is observed, and it refines grain size obviously. Deposit hardness up to 679HV.

scholarly journals Effect of grain size and doping level of sic on the superconductivity and critical current density in MgB/sub 2/ superconductor

2003 ◽  
Vol 13 (2) ◽  
pp. 3273-3276 ◽  
Author(s):  
S. Soltanian ◽  
Xiaolin Wang ◽  
J. Horvat ◽  
Mengjun Qin ◽  
Huakun Liu ◽  
...  
Keyword(s):  
Grain Size ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Doping Level

scholarly journals Study of Y1Ba2Cu3O7−δ+CuO Nanocomposite as a Resistive Current Limiter

2019 ◽  
Vol 19 (02) ◽  
pp. 1950010 ◽  
Author(s):  
A. V. Ushakov ◽  
I. V. Karpov ◽  
V. G. Demin ◽  
A. A. Shaihadinov ◽  
A. I. Demchenko ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Speed ◽  
High Efficiency ◽  
High Temperature Superconductors ◽  
Experimental Studies ◽  
Cuo Nanoparticles ◽  
Current Switch ◽  
Current Limiter

The influence of CuO nanoscale inclusions as the second component of the composites on the transport properties of superconducting polycrystals YBa2Cu3O7 was studied. Samples of YBa2Cu3O[Formula: see text] with different content of CuO nanoparticles were synthesized. The analysis of magnetic properties was carried out within the framework of the extended critical state model. It was found that the addition of 20[Formula: see text]wt.% CuO nanoparticles leads to an increase in the critical current density at [Formula: see text][Formula: see text]K. A further increase to 30[Formula: see text]wt.% reduces the critical current density. The results of the experimental studies of a switching superconducting fault current limiter in AC voltage networks based on high-temperature superconductors (HTSC) of the 2nd generation are given in this work. The testing equipment contains a series-connected HTSC module and a high-speed current switch with a break time of 9[Formula: see text]ms. The high efficiency of the samples made from the YBa2Cu3O[Formula: see text] + CuO nanocomposite material as an active element of a resistive current limiter is shown.

Crystallization of A15 Nb3Ge from the amorphous state

1990 ◽  
Vol 5 (3) ◽  
pp. 478-483
Author(s):  
Marcin Wardak ◽  
Mireille Treuil Clapp
Keyword(s):  
Grain Size ◽  
Critical Current Density ◽  
Critical Current ◽  
Grain Growth ◽  
Current Density ◽  
Amorphous Material ◽  
Amorphous State ◽  
Average Grain Size ◽  
Melt Spun ◽  
Melt Spun Ribbons

The critical current density Jc of superconductors is strongly dependent on microstructure. The microstructure and crystallization of amorphous Nb75Ge24.5B0.5 melt spun ribbons were studied as a function of 24-h anneals between 680 and 860 °C. Metastable A15 was formed with a composition close to that of the starting amorphous material. As the temperature increased from 680 to 720°C, crystallization remained nonuniform and the average grain size decreased from 130 nm to 60 nm. Between 740 and 800°C crystallization was uniform and the average grain size was constant at 30 nm. Above 820°C grain growth occurred. In order to have high Jc's a uniformly crystallized small-grained material is desirable.

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