Fabrication conditions and superconducting properties of Ag‐sheathed Bi‐Sr‐Ca‐Cu‐O tapes prepared by partial melting and slow cooling process

1993 ◽  
Vol 62 (17) ◽  
pp. 2131-2133 ◽  
Author(s):  
K. Nomura ◽  
M. Seido ◽  
H. Kitaguchi ◽  
H. Kumakura ◽  
K. Togano ◽  
...  
Keyword(s):  
Partial Melting ◽  
Superconducting Properties ◽  
Cooling Process ◽  
Slow Cooling

scholarly journals Transitions and Geometric Evolution of Cu309 Nanocluster during Slow Cooling Process

Crystals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 231
Author(s):  
Pengfei Ji ◽  
Yi Zhao ◽  
Mingli Wan ◽  
Jinna He ◽  
Mingli Tian ◽  
...  
Keyword(s):  
Cooling Process ◽  
Slow Cooling ◽  
Geometric Evolution

Rapid microwave synthesis of Cu2Se thermoelectric material with high conductivity

2021 ◽  
pp. 2151005
Author(s):  
Yongpeng Wang ◽  
Wenying Wang ◽  
Haoyu Zhao ◽  
Lin Bo ◽  
Lei Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Grain Growth ◽  
Microwave Synthesis ◽  
Annealing Process ◽  
High Electrical Conductivity ◽  
Cooling Process ◽  
Slow Cooling ◽  
Te Material ◽  
Hot Pressing Sintering

In this study, the dense bulk Cu2Se thermoelectric (TE) materials were prepared by microwave melting and hot pressing sintering. The effects of different cooling processes on the microstructure and TE properties of Cu2Se were investigated. The results showed that the Cu2Se TE material prepared by microwave synthesis had high electrical conductivity, which was about 105 S⋅ m[Formula: see text]. The annealing process can lead to grain growth of Cu2Se and the formation of micropores in the Cu2Se, which deteriorated the thermal conductivity. The Cu2Se material prepared by the microwave melting and slow cooling process had the best TE performance, and the ZT value can reach 0.68 at 700 K.

Connectivity and flux pinning improvements in Ag-clad BSCCO-2223 tapes produced by changes in the cooling rate

1997 ◽  
Vol 12 (11) ◽  
pp. 2997-3008 ◽  
Author(s):  
J. A. Parrell ◽  
D. C. Larbalestier ◽  
G. N. Riley ◽  
Q. Li ◽  
W. L. Carter ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Critical Temperature ◽  
Cooling Rate ◽  
Flux Pinning ◽  
Irreversibility Field ◽  
Superconducting Properties ◽  
Temperature Transition ◽  
Slow Cooling ◽  
Reaction Heat ◽  
Final Reaction

The rate at which Ag-clad (Bi, Pb)2Sr2Ca2Cu3Ox tapes are cooled from their final reaction heat treatment influences both the intergranular connectivity and intragranular flux pinning strength of the polycrystalline filaments. As the cooling rate from 825 °C to 730 °C in 7.5% O2 was decreased over a range of 5 °C/min to 0.005 °C/min, Jc (77 K, 0 T) increased from ∼8 to ∼24 kA/cm2, and the irreversibility field increased from, ∼120 to, ∼200 mT. The Jc (4.2 K, 0 T) increased in a similar fashion. Cooling slowly also sharpened the critical temperature transition and increased the critical onset temperature from 107 K to 109 K. These improvements in the superconducting properties occurred despite partial decomposition of the (Bi, Pb)2Sr2Ca2Cu3Ox phase into non-superconducting impurity phases during the slow cooling. A microstructural basis for these multiple effects is described.

Effect of MgO content on the formation and superconducting properties of (Bi,Pb)-2223 phase in the partial-melting and sintering process

2001 ◽  
Vol 357-360 ◽  
pp. 828-831 ◽  
Author(s):  
X.Y. Lu ◽  
A. Nagata ◽  
D. Kamio ◽  
K. Sugawara ◽  
S. Kamada ◽  
...  
Keyword(s):  
Partial Melting ◽  
Sintering Process ◽  
Superconducting Properties

Dielectric Properties of Epoxy/Anhydride System in Long-Term Storage

2017 ◽  
Vol 898 ◽  
pp. 2143-2146
Author(s):  
Chun Miao Han ◽  
Kang Peng ◽  
Liu Yang ◽  
Zhi Bin Zeng
Keyword(s):  
Dielectric Properties ◽  
Loss Angle ◽  
Cooling Process ◽  
Slow Cooling ◽  
Long Term Storage ◽  
Dielectric Loss Angle ◽  
Different Content ◽  
Curing Procedure ◽  
Term Storage

The change of dielectric properties of epoxy/anhydride systems during eleven months storing was investigated. Test systems were bisphenol-A epoxy cured by different content of methyl-hexahydrophthalic anhydride with a slow cooling process across Tg range included in their curing procedure to reduce residual stress. The results showed all the systems’ dielectric constant and dielectric loss angle tangent had a trend of down then up. The highest decreasing amplitudes were about 4% and 10% respectively. Possible explanations for these phenomena were proposed, and then some preliminary investigations were carried out like DSC and IR.

Implementation of Glass Transition Physics in Glass Molding Simulation

2011 ◽  
Vol 325 ◽  
pp. 707-712 ◽  
Author(s):  
H.H. Ruan ◽  
Liang Chi Zhang
Keyword(s):  
Monte Carlo ◽  
Glass Transition ◽  
Optical Glass ◽  
Master Equations ◽  
Cooling Process ◽  
Slow Cooling ◽  
Potential Energy Landscape ◽  
The Monte Carlo Method ◽  
Element Simulation ◽  
Replication Quality

Glass transition is the most important factor in the thermo-forming of glass elements of precise geometries such as optical glass lenses. Among many attempts to model the physics of glass transition, the Master equations based on the potential energy landscape (PEL) appear to be apropos. In this study, we used Monte-Carlo approach to approximately solve the master equations and further implement the Monte-Carlo method in the finite element simulation. We used Selenium as an example since its PEL has been quantified. Through the FEM simulations, it is found that the geometrical replication quality is the best when the forming is performed at the viscosity around 105~106Pa×s, that the residual stress developed in the cooling process can be minimized in the slow cooling process or through post-annealing process after moulding.

Effects of Electromagnetic Agitation on Crystal Growth during the Pure Aluminum Slow Cooling Process

2020 ◽  
Vol 993 ◽  
pp. 398-403
Author(s):  
Xiang Jie Wang ◽  
Fang Yu ◽  
Peng Wei Li ◽  
Wei Sun ◽  
Hong Juan Tan ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Structure Refinement ◽  
Pure Aluminum ◽  
Low Frequency ◽  
Casting Process ◽  
Cooling Process ◽  
Continuous Casting Process ◽  
Slow Cooling ◽  
Fine Grain ◽  
Refinement Effect

Refining grains are important to obtain sound cast billets suitable for further processing. The structure refinement of low frequency electromagnetic field (LFEF) during the aluminum alloy semi-continuous casting process has been confirmed by many researchers. In this work, effects of the electromagnetic agitation on the crystal growth were investigated during the pure aluminum slow cooling process. The results showed that the grain refinement effect by electromagnetic agitation mainly occurred at the first half period of crystal growth. With increasing of applying LFEF treated time, the fine grain occupied the whole section of ingot, and the ratio of fine grain zone to the whole section was proportional to the treated time.

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