The friction and wear behaviour of ZrO*-Y203, Zr02-Y203--Ce02 and ZrQ--A1203 composite ceramics against hardened steel AISI-52100 were investigated using a pin on plate configuration under reciprocating motion. The reproducibility of the results was examined in this configuration. Wear characteristics were separated into system and material contributions. Under the conditions used, all the cera...

1Jagiellonian University, Institute of Zoology, Department of Cell Biology and Imaging, Poland; 2University of Science and Technology, Faculty of Material Science and Ceramics, Department of Glass Technology and Amorphous Coatings, Poland; 3Jagiellonian University Medical School, Institute of Physiotherapy, The Clinics of Orthopaedics and Traumatology of the Musculoskeletal System, Poland; 4Uni...

High frequency acoustic imaging represents a powerful technique for the nondestructive evaluation of optically opaque materials. In this report the Scanning Laser Acoustic Microscope (SLAM) is used to detect and characterize flaws in ceramics. SLAM micrographs showing typical examples of cracks, laminar flaws, porosity and solid inclusions. are presented. The various flaw types are easily diffe...

The structures, processes of shrinkage, and phase composition of the compact system ZrO2-WC, obtained by hot pressing with the transmission of high current, are considered in the article. We found that as a result of compaction, the ZrO2-WC-ceramics have uniform density distribution, with the following optimal mode consolidation values T = 1,350°C, P = 30 MPa and t = 2 min. These conditions all...

The Museum's collection of ceramics has been greatly enriched recently by the purchase of nearly a hundred examples of Spanish lusterware of the fifteenth and sixteenth centuries. The majority of the pieces are Valencian and were made in the fifteenth century, giving a very thorough picture of the stylistic development of majolica in Spain in its early phases, which had such wide-spread effects...

This study illustrates how social relations-rather than simple proxlmlty­ influence spatial patterning in the distribution of contemporary Dalupa ceramics. The Ka1inga pottery exchange network participates in a multi-centric economy. characterized by slightly overlapping exchange networks marked by different exchange mechanisms and goods. The suki relationship. a trade partnership that bridges ...

A model for percolative vortex motion in inhomogeneous superconductors is introduced. Near the percolation threshold the linear, frequency-dependent electronic conductivity is found to obey scaling laws. The percolation model for vortex motion provides an alternative explanation to the experimental finding of scaling in the electronic conductivity that is conventionally attributed to a vortex g...