Various distribution functions were compared while analyzing bending strength data obtained with a very large (over 5000) number of alumina test bars (12 bars per production lot) fabricated over years by Hidria, AET (Tolmin, Slovenia). It has been demonstrated that at this large number of samples the Weibull’s distribution represents the best choice among all commonly used 2-parameter distributions, such as normal, log-normal etc . Besides, the accuracy of the determination of Weibull’s distribution parameters could be further be improved by modifying existing standard methods, such as linear regression, maximum likelihood, methods of moments, etc.. These findings were later successfully used in assessment of flexural strength of fiber-reinforced roofing panels produced by Esal (Anhovo, Slovenia).
COBISS.SI-ID: 25578279
The evolution of aluminum hydroxides in diluted aqueous aluminum nitride (AlN) powder suspensions in the temperature range 22–90 °C was studied in order to set up a general mechanistic model over a broad temperature range. It is shown that dispersing the AlN powder in the water results in the temperature-dependent formation of various aluminum hydroxides in the following sequence: amorphous aluminum hydroxide gel, aluminum monohydroxide (boehmite), and aluminum trihydroxides (bayerite, nordstrandite, and gibbsite). The unique interdependency between the temperature and the pH of the hydrolyzing AlN powder suspension, governed by the ammonia’s solubility and the exothermic hydrolysis reactions producing Al(OH)4– species, is the driving force for several evolution paths.
COBISS.SI-ID: 25586727
In this practically important and highly cited paper a non-invasive surface preparation method has been presened that significantly improves resin-bond strength to dental zirconia (Y-TZP) ceramics. After surface functionalization the bond survives thermocycling without reduction in strength.
COBISS.SI-ID: 26997977
In this article new biomimetic method for the deposition of octacalcium phosphate coatings on zirconia ceramics (Y-TZP) is described. Such coatings are bioactive and enable the growth of bone tissue on the surface of bone implants. The method described is fast, simple and very reproducible. After the thermal treatment the coatings exhibit good mechanical properties and excellent long-lasting adhesion to the substrate.
COBISS.SI-ID: 25607207
An in-vitro study was designed to monitor the t–m transformation of biomedical grade 3Y-TZP ceramics produced from two ready-to-press granulated powders of the same nominal chemical composition, but differing in their specific surface area. The sintering-temperature-dependent transformability during ageing was confirmed, whereby the role of the starting powder characteristics was more pronounced at lower sintering temperatures and was almost negligible at higher sintering temperatures.
COBISS.SI-ID: 25760807