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Dependence of the microstructure of Ag/BSCCO composites on filler content

Els Bruneel (UGent) , Isabel Van Driessche (UGent) and Serge Hoste (UGent)
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Abstract
In order to obtain high Tc superconducting materials with improved mechanical properties, Bi1,5Pb0,5Sr2Ca2Cu3Ox / Ag-composites with 3 different filler morphologies were successfully synthesised. It is shown that Ag-addition improves Bi-2223 grain growth and reduces sample-porosity. An alignment of the ceramic phase along the surface of the Ag was observed and the results of TEM, SEM, DTA and EDX mapping are discussed. Conclusions concerning the alignation-mechanisms based upon these observations are compared with popular models described in literature. Composites exhibit increased ductility and isostrain conditions are met. Little effect on the mechanical strength is observed but the mismatch in thermal expansion coefficient induces a residual stress field at the filler matrix interface and allows toughening mechanisms to appear, resulting in a clear post-peak behaviour. SEM pictures of whisker debonding, crack bridging and whisker pullout, all demonstrating a suitable filler-matrix interface, are included. The role of the filler morphology and the sequence of the processing steps on the toughening efficiency will be discussed.
Keywords
Bi-high temperature superconductor, Ag, alignation, composite, mechanical properties

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Chicago
Bruneel, Els, Isabel Van Driessche, and Serge Hoste. 2001. “Dependence of the Microstructure of Ag/BSCCO Composites on Filler Content.” In Science and Technology, 19th Conference, Proceedings, 19–23.
APA
Bruneel, Els, Van Driessche, I., & Hoste, S. (2001). Dependence of the microstructure of Ag/BSCCO composites on filler content. Science and Technology, 19th Conference, Proceedings (pp. 19–23). Presented at the 19th Science and Technology conference.
Vancouver
1.
Bruneel E, Van Driessche I, Hoste S. Dependence of the microstructure of Ag/BSCCO composites on filler content. Science and Technology, 19th Conference, Proceedings. 2001. p. 19–23.
MLA
Bruneel, Els, Isabel Van Driessche, and Serge Hoste. “Dependence of the Microstructure of Ag/BSCCO Composites on Filler Content.” Science and Technology, 19th Conference, Proceedings. 2001. 19–23. Print.
@inproceedings{312226,
  abstract     = {In order to obtain high Tc superconducting materials with improved mechanical properties, Bi1,5Pb0,5Sr2Ca2Cu3Ox / Ag-composites with 3 different filler morphologies were successfully synthesised. It is shown that Ag-addition improves Bi-2223 grain growth and reduces sample-porosity. An alignment of the ceramic phase along the surface of the Ag was observed and the results of TEM, SEM, DTA and EDX mapping are discussed. Conclusions concerning the alignation-mechanisms based upon these observations are compared with popular models described in literature.
Composites exhibit increased ductility and isostrain conditions are met. Little effect on the mechanical strength is observed but the mismatch in thermal expansion coefficient induces a residual stress field at the filler matrix interface and allows toughening mechanisms to appear, resulting in a clear post-peak behaviour. SEM pictures of whisker debonding, crack bridging and whisker pullout, all demonstrating a suitable filler-matrix interface, are included. The role of the filler morphology and the sequence of the processing steps on the toughening efficiency will be discussed.},
  author       = {Bruneel, Els and Van Driessche, Isabel and Hoste, Serge},
  booktitle    = {Science and Technology, 19th Conference, Proceedings},
  keywords     = {Bi-high temperature superconductor,Ag,alignation,composite,mechanical properties},
  language     = {eng},
  location     = {Hanoi, Vietnam},
  pages        = {19--23},
  title        = {Dependence of the microstructure of Ag/BSCCO composites on filler content},
  year         = {2001},
}