International Journal of Materials Chemistry and Physics
Articles Information
International Journal of Materials Chemistry and Physics, Vol.1, No.3, Dec. 2015, Pub. Date: Jan. 9, 2016
Bi-2212 Low Temperature Phase Optimization Condition by Vickers Hardness Numbers
Pages: 407-416 Views: 1728 Downloads: 1169
Authors
[01] Ibrahim Karaca, Department of Physics, Faculty of Science, Niğde University, Niğde, Turkey.
[02] Mehmet Ali Güzel, Graduate School of Arts and Sciences, Niğde University, Niğde, Turkey.
Abstract
Recently the interest about Bi-2212 superconductor for high magnetic field use has been enhancing despite the fact that an increase of the critical current is still needed to boost its successful use in such applications. The sintering time effect is investigated with using the Vickers hardness number for the BSCCO samples. The results of the Vickers hardness number are used to describe the indentation size effect (ISE) according to Oliver-Phar model. The different theoretical models are examined with the results of the hardness. It is found that the modified PSR model is convenient to analyzing the results of the hardness. The true hardness is related with the long sintering time, according to modified PSR model. From the relationship between the true hardness and sintering time, one can be drawn that the increase with the hardness range of sintering time 15h to 85h is positively affected the true hardness. But the longer sintering time than the 85 h is damagingly affected on the true hardness. From this it can be concluded that the grain size may be decrease for the longer sintering time than the 85 h in the bulk BSCCO samples. This can be attractive for the obtaining high magnetic field with superconducting Bi-2212 wire.
Keywords
Micro-hardness, ISE, Sintering Time Condition, Bi-2212
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