III 2017

Coating synthetic materials with zinc oxide nanoparticles acting as a UV filter (full article PDF)
Zinc oxide (ZnO) is one of physical filters that effectively absorb ultraviolet light in the UV-A range. ZnO produced at the Laboratory of Nanostructures was characterised by nanometric particle size of 28±4 nm (SSA BET). By coating the surface of a transparent film of polyethylene terephthalate (PET) with ZnO nanoparticles, the authors aimed at obtaining a coating that absorbs UV-A radiation. The coating process took place in a water suspension of ZnO, in which the phenomenon of acoustic cavitation was triggered, where the implosion of cavitation bubbles led to deposition of ZnO nanoparticles on the PET film surface. As part of the work, optimum parameters of the PET film coating process were developed, thus obtaining a filter in the form of a ZnO coating that effectively absorbs UV light.
Bartosz Woźniak Eng.

Loss-shaping of ceramic products containing thin walls (less than 1 mm) using a CNC machine tool.
The machining of raw or burned ceramics elements is frequently used operation in conventional technical ceramics. The article presents the results of work carried out in order to provide information about the capabilities of a CNC machining when making short series of thin-walled components. Research has been conducted on the most popular ceramic materials such as alumina and steatite. Shape used in the process had similar structure to a honeycomb with longitudinal channels and less than 1 mm thick walls.
Andrzej Łosiewicz M.Sc. Eng

Low-temperature degradation of Y-TZP zirconia ceramics. Part I: Microscopic observations and phase analysis
The subject of the study was the phenomenon of low-temperature degradation (LTD) of Y-TZP zirconia ceramics. It has crucial impact on functionality and stability of zirconia elements. The aim of this work was to investigate the initial stages of LTD process of zirconia ceramics by means of phase analysis XRD and SEM microscopic observations. Phase analysis conducted by X-ray diffraction method showed that the content of monoclinic phase in samples after aging increased. The content of the monoclinic ZrO2 phase in aged samples was proportional to the aging time. XRD results have been confirmed by SEM image analysis.
Paulina Tymowicz- Grzyba M.Sc.

The optimization of the annealing process of hand formed glass in electric annealing furnace
Conducting of the glass annealing process is not an easy one in a situation when in a factory artefacts of different shapes and sizes are produced, from blown and from thick glass, in short series. This kind of production requires the optimization of annealing process because the artefacts from thick glass – glass animals, flowers, paperweights can be distorted due to too high upper annealing temperature. Excessively low upper annealing temperature, by contrast, precludes the release of interior stresses. The paper presents the results of interior stresses tests conducted for several representative artefacts produced in Kraków Division of Institute of Ceramics and Building Materials and shows how they influenced the conducting of the glass annealing process.
Magdalena Woźniak M.Sc. Eng.