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The purpose of this study is to evaluate the use of talc in superwhite porcelain tile bodies. The study was conducted using technological laboratory techniques and analytical techniques such as XRD, XRF and SEM for the mineralogical, chemical and microstructural characterisation of natural and fired materials. This study therefore aims to establish which raw material containing talc is most suitable for use in super-white porcelain tile bodies and to determine the optimal quantity to be added to the body.
Natural corals are used as they are extracted or when converted to hydroxyapatite in reconstructive surgeries having structural similarities to bone. The present work is dealing with the study of the thermal behaviour of corals (CO) harvested from red sea in parallel with a sample of chemically precipitated calcium carbonate (CC) for comparison.
Predictions of a mathematical model developed for analysing deviations from rectilinearity of a crack in brittle elastic materials containing a dilute distribution of pores are compared with experimental results relative to some ceramic materials containing spheroidal pores: glazed ceramic tiles and an yttria stabilised zirconia. The investigation involves simple experimental setting, namely crack defection of the median-radial cracks induced by Vickers indentation. This was compared with the predictions of the model. Despite of the strong hypotheses (plane strain and small ratio between inclusion diameter/crack distance) the results are qualitatively accurate. This may suggest the use of the model as a tool to design ceramic porous and composite materials.
Piezoceramics are used to convert mechanical energy into electrical energy and vice versa. Due to their ability to be tailored towards the requirements of particular applications, they have replaced natural and synthetic piezo crystals in many devices and their application range is continuously expanding. The aim of this work is to provide a clear and useful introduction to piezoceramics that will orient the reader to the selection of the most suitable material for a specific application. After a brief description of the piezoelectric material development, the properties of piezoceramics will be described and correlated with the crystalline structure. Finally, as a case study the various developmental phases of an ultrasonic probe suitable for the dynamic mechanical analysis of polymers at high frequency will be presented.
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