ELECTRICALLY CONDUCTIVE CB/PET/PE COMPOSITE PREPARED THROUGH EXTRUSION AND HOT STRETCHING
Based on the previous study of in-situ fibrillation of general engineering plastics/general-purpose plastics, it was attempted to prepare fibrillar carbon black (CB)/poly(ethylene terephthalate) (PET)/polyethylene (PE) composite with electrical conductivity through extrusion and hot stretching. CB and PET were first melted mixed into masterbatch. Then, the mixture of CB/PET masterbatch and PE were extruded and hot stretched. It was found that the melt viscosity of masterbatch can affect the formation of in-situ fibers. As the CB loading is relatively low, the composite has obvious in-situ fibers and hence has correspondingly good conductivity.
Ag-added Y–Ba–Cu–O bulk superconductors were joined using Ag-added Er–Ba–Cu–O solder and different Er211 contents. Microstructural analysis revealed that the volume fraction of Er211 at the joint with a composition of Er123:Er211 = 4:1 was the same as that for the expected volume fraction of the initial composition. That is, this composition seems to be optimum, since the mass balance was maintained during the crystal growth from the initial growth stage to the final stage. The trapped-field distribution for the joint using this composition was uniform and the only single peak indicated that strong coupling was achieved.