Influence of powder characteristics on the properties of green compacts of Bi-2212 powders

1997 ◽  
Vol 12 (1) ◽  
pp. 21-27 ◽  
Author(s):  
D.-W. Yuan ◽  
M. D. Aesoph ◽  
J. Kajuch
Keyword(s):  
High Temperature ◽  
Confining Pressure ◽  
Plastic Behavior ◽  
Particle Sizes ◽  
Green Density ◽  
High Temperature Superconducting ◽  
Powder Characteristics ◽  
The Relationship ◽  
Powder In Tube ◽  
Superconducting Applications

With the growing potential for use of Bi-2212 powders in high temperature superconducting applications, it is important to understand the processing characteristics of the material. To meet this need, the present work established the relationship between confining pressure and green density for powders of different particle sizes and morphologies. Mechanical properties, including elastic and plastic behavior, of the resulting green compacts were also measured as a function of relative density. Particle size and size distribution are shown to have a significant impact on the properties of interest. The implications of such findings are discussed with respect to the powder-in-tube process for making high temperature superconducting wire and tape.

Epitaxial YBa2Cu3O7 films on rolled-textured metals for high-temperature superconducting applications

1998 ◽  
Vol 56 (2-3) ◽  
pp. 86-94 ◽  
Author(s):  
D.P. Norton ◽  
C. Park ◽  
C. Prouteau ◽  
D.K. Christen ◽  
M.F. Chisholm ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconducting ◽  
Superconducting Applications

scholarly journals Study on Quenching Characteristics and Resistance Equivalent Estimation Method of Second-Generation High Temperature Superconducting Tape under Different Overcurrent

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2374 ◽  
Author(s):  
Liang ◽  
Ren ◽  
Ma ◽  
Xu ◽  
Tang ◽  
...  
Keyword(s):  
High Temperature ◽  
Normal State ◽  
Second Generation ◽  
Estimation Method ◽  
Element Model ◽  
Experimental Results ◽  
Superconducting Tape ◽  
High Temperature Superconducting ◽  
Equivalent Method ◽  
The Relationship

In this paper, through AC and DC overcurrent tests on second generation high temperature superconducting tape (2G HTS tape), we respectively summarize the typical types of quenching resistance and corresponding quenching degree, in which there are three types under AC overcurrent and two types under DC overcurrent. According to experimental results, a rule was found that, when 2G HTS tape quenches to normal state, the relationship between quenching resistance and joule heat generated from 2G HTS tape presents a fixed trend line, and the influence of liquid nitrogen can be ignored. Then, the characteristics and rules of quenching resistance found in experiments are well explained and confirmed by a detailed 3D finite element model of 2G HTS tape including electromagnetic field and thermal field. Finally, based on above works, our group proposes a new equivalent method to estimate the quenching resistance, where the results of AC and DC overcurrent experiments can be equivalent to each other within a certain range. Compared with FEM, the method has the following advantages: (i) The method is simple and easy to implement. (ii) This method combines precision and computational efficiency. (iii) With superconducting tape quenching to normal state, this method presents a good consistency with experimental results.

SUPERLATTICE STRUCTURE IN HIGH-TEMPERATURE SUPERCONDUCTING Y-Ba-Cu-O SYSTEM

1987 ◽  
Vol 01 (02) ◽  
pp. 355-358
Author(s):  
K. Godwod ◽  
J. Górecka ◽  
J. Majewski
Keyword(s):  
High Temperature ◽  
Superconducting Property ◽  
Superconducting Phase ◽  
High Temperature Superconducting ◽  
Superlattice Structure ◽  
Phase Concentration ◽  
The Relationship

A set of superconducting samples with different superconducting phase concentration was investigated. The superlattice structure /2xa, 2xb, 2xc/ in the orthorhombic superconducting YBa2Cu3Oy was revealed. The relationship between superconducting property and the superlattice presence was found.

Preparation and Characterisation of Dense TiO2 Ceramics

2008 ◽  
Vol 54 ◽  
pp. 261-264 ◽  
Author(s):  
Agnese Pavlova ◽  
Liga Berzina-Cimdina ◽  
Janis Locs ◽  
Dagnija Loca ◽  
Joerg Bossert
Keyword(s):  
High Temperature ◽  
Mineralogical Composition ◽  
Particle Packing ◽  
Biologically Active ◽  
Raw Material ◽  
Oxide Ceramics ◽  
Green Density ◽  
Temperature Modification ◽  
Powder Characteristics ◽  
High Temperature Modification

In past years scientists have interest in new specific TiO2 properties, which result from oxygen and titanium ratio in ceramic. Recently such TiO2 applications as implantable biomaterials in medicine and photocatalysts in purification of waste water become very significant. High temperature vacuum treated titanium oxide ceramics become biologically active and decrease microbiological water pollution when used as electrodes in electrochemical water treatment. In most of these cases highly dense ceramics are requested. TiO2 low-temperature modification anatase and TiO2 high-temperature modification rutile was used during the investigation. Different additives were used to improve particle packing and increase green density of pressed pellets as well as following sinter density. During the investigation it was found that green density of the samples depends not only on powder characteristics such as particle size distribution, grain size, mineralogical composition of raw material, quantity and nature of additives used in mass preparation procedure but also on kind and magnitude of compaction and sintering conditions.

Superconducting Wind Generators with Capacities of 10 MW and Larger

2020 ◽  
Vol 10 (10) ◽  
pp. 59-67
Author(s):  
Victor N. ANTIPOV ◽  
◽  
Andrey D. GROZOV ◽  
Anna V. IVANOVA ◽  
◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Wind Power ◽  
State Of The Art ◽  
Superconducting Materials ◽  
Commercial Application ◽  
Synchronous Generators ◽  
High Temperature Superconducting ◽  
Wind Generators ◽  
Main Factor

The overall dimensions and mass of wind power units with capacities larger than 10 MW can be improved and their cost can be decreased by developing and constructing superconducting synchronous generators. The article analyzes foreign conceptual designs of superconducting synchronous generators based on different principles: with the use of high- and low-temperature superconductivity, fully superconducting or only with a superconducting excitation system, and with the use of different materials (MgB2, Bi2223, YBCO). A high cost of superconducting materials is the main factor impeding commercial application of superconducting generators. In view of the state of the art in the technology for manufacturing superconductors and their cost, a conclusion is drawn, according to which a synchronous gearless superconducting wind generator with a capacity of 10 MW with the field winding made of a high-temperature superconducting material (MgB2, Bi-2223 or YBCO) with the «ferromagnetic stator — ferromagnetic rotor» topology, with the stator diameter equal to 7—9 m, and with the number of poles equal to 32—40 has prospects for its practical use in the nearest future.

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