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Structural and mechanical properties of particulate, whisker and unidirectional Bi-2223 Ag composites

Els Bruneel (UGent) , Takeo Oku, Joris Degrieck (UGent) , Isabel Van Driessche (UGent) and Serge Hoste (UGent)
(2002) Key Engineering Materials. 206(2). p.637-640
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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
composite, SILVER, mechanical properties, Ag, Bi-high temperature superconductor, alignation

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Chicago
Bruneel, Els, Takeo Oku, Joris Degrieck, Isabel Van Driessche, and Serge Hoste. 2002. “Structural and Mechanical Properties of Particulate, Whisker and Unidirectional Bi-2223 Ag Composites.” Key Engineering Materials 206 (2): 637–640.
APA
Bruneel, Els, Oku, T., Degrieck, J., Van Driessche, I., & Hoste, S. (2002). Structural and mechanical properties of particulate, whisker and unidirectional Bi-2223 Ag composites. Key Engineering Materials, 206(2), 637–640. Presented at the 7th Conference of the European Ceramic Society.
Vancouver
1.
Bruneel E, Oku T, Degrieck J, Van Driessche I, Hoste S. Structural and mechanical properties of particulate, whisker and unidirectional Bi-2223 Ag composites. Key Engineering Materials. 2002;206(2):637–40.
MLA
Bruneel, Els, Takeo Oku, Joris Degrieck, et al. “Structural and Mechanical Properties of Particulate, Whisker and Unidirectional Bi-2223 Ag Composites.” Key Engineering Materials 206.2 (2002): 637–640. Print.
@article{162260,
  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 Oku, Takeo and Degrieck, Joris and Van Driessche, Isabel and Hoste, Serge},
  isbn         = {9780878498826},
  issn         = {1013-9826},
  journal      = {Key Engineering Materials},
  keywords     = {composite,SILVER,mechanical properties,Ag,Bi-high temperature superconductor,alignation},
  language     = {eng},
  location     = {Brugge, Belgium},
  number       = {2},
  pages        = {637--640},
  title        = {Structural and mechanical properties of particulate, whisker and unidirectional Bi-2223 Ag composites},
  url          = {http://dx.doi.org/10.4028/www.scientific.net/KEM.206-213.637},
  volume       = {206},
  year         = {2002},
}

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