Biomedical Engineering Reference
In-Depth Information
9
High-temperature superconducting ceramic
nanocomposites
A. O. TONOYAN andS. P. DAVTYAN,
State Engineering University of Armenia, Armenia
Abstract: This chapter reviews the preparation and study of high-
temperature superconducting (SC) nanocomposites based on SC ceramics
and various polymeric binders. Regardless of the size of the ceramic
grains, any increase in their quantity results in an increase of resistance
to rupture and modulus and a decrease in limiting deformation, whilst a
similar increase in the average ceramic grain size worsens resistance
properties. Investigation of the SC, thermo-chemical, mechanical and
dynamic-mechanical properties of the samples are discussed.
Superconducting properties of the polymer-ceramic nanocomposites are
explained by intercalation of macromolecule fragments into the
interstitial layer of the ceramic grains, a phenomenon that leads to a
change in the morphological structure of SC nanocomposites.
Key words: polymer-ceramic nanocomposites, superconducting, physical-
mechanical properties, dynamic-mechanical properties, morphological
structure.
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9.1
Introduction
This chapter reviews recent research on the effect of various processing
techniques and parameters on the superconducting (SC) characteristics of
high-temperature SC polymer-ceramic composites. Following the discovery
of high-temperature superconductivity in perovskite systems containing
oxygen by Bednorz and Muller [1, 2], the literature on this topic has become
a veritable avalanche, as both fundamental and applied research on the
fabrication of metal [3-14] and polymer [15-26] binder composites of
various geometries possessing SC properties has been undertaken. Polymer-
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