Inovační technologie v keramice
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Macroporous bioceramic scaffolds based on tricalcium phosphates reinforced with silica: microstructural, mechanical, and biological evaluation
(Informa, 2022-03-27)The positive effect of silica on microstructural, mechanical and biological properties of calcium phosphate scaffolds was investigated in this study. Scaffolds containing 3D interconnected spherical macropores with diameters ... -
Why freeze-casting brings different phase composition of calcium phosphates?
(Elsevier, 2021-09-01)The impact of freeze-casting on the porosity, pore distribution, and phase composition was studied and compared with conventional shaping techniques. A bimodal pore size distribution was observed in freeze-cast + freeze-dried ... -
Tailoring a Refractory High Entropy Alloy by Powder Metallurgy Process Optimization
(MDPI, 2021-10-01)This paper reports the microstructural evolution and mechanical properties of a low-density Al0.3NbTa0.8Ti1.5V0.2Zr refractory high-entropy alloy (RHEA) prepared by means of a combination of mechanical alloying and spark ... -
Poling procedures and piezoelectric response of (Ba0.85Ca0.15Zr0.1T0.9)O-3 ceramics
(Taylor & Francis, 2020-12-23)The goal of the current report was to find the optimal poling conditions: poling field, poling time and poling temperature for lead-free (Ba0.85Ca0.15Zr0.1T0.9)O-3 ceramic. It has been noticed that the low poling field (< ... -
Properties of BaTiO3/Al2O3 Laminate Structure by Nanoindentation
(Elsevier, 2020-02-19)The proposed material design of BaTiO3/Al2O3/ZrO2 laminate structure predetermined for energy harvesters taking advantage of residual stresses developed during processing was prepared by electrophoretic deposition. The ... -
Characterization of Polyvinylidene Fluoride (PVDF) Electrospun Fibers Doped by Carbon Flakes
(MDPI, 2020-11-24)Polyvinylidene fluoride (PVDF) is a modern polymer material used in a wide variety of ways. Thanks to its excellent resistance to chemical or thermal degradation and low reactivity, it finds use in biology, chemistry, and ... -
The Origins of High-Entropy Alloy Contamination Induced by Mechanical Alloying and Sintering
(MDPI, 2020-09-03)One of the prevailing problems for materials produced by powder metallurgy is contamination from various sources. This work deals with the influence of process parameters and presence of process control agents (PCA) on the ... -
Derivation of losses from impedance spectrum for contour modes of ceramic resonator
(Taylor & Francis, 2020-04-02)Method of loss coefficients calculation from mechanical quality factors of transversal vibration modes is presented. Theoretical formulae are derived for the contour mode of thin square plate and width extensional mode of ... -
Processing and properties of luminescent Cr3+ doped transparent alumina ceramics
(Elsevier, 2020-07-01)Transparent Cr2O3-doped alumina ceramics were prepared by slip casting, followed by pre-sintering in ambient atmosphere and hot isostatic pressing. The effect of dopant concentration on material properties, including ... -
Thermal annealing effects in polycrystalline EuTiO3 and Eu2Ti2O7
(AIP Publishing, 2019-12-01)Using time-differential perturbed angular correlation of gamma rays, we investigated the electric-field gradient of polycrystalline EuTiO3 and Eu2Ti2O7, with Hf-181(Ta-181) as a probe, following different thermal treatments. ... -
Transparent magnesium aluminate spinel: Effect of critical temperature in two-stage spark plasma sintering
(ELSEVIER SCI LTD, 2020-06-01)The discolouration of magnesium aluminate spinet caused by carbon contamination is a main drawback of fabricating transparent bodies by spark plasma sintering (SPS). In this study, a two-stage heating rate profile was used ... -
Synthesis of high density sub-10 µm (Ba0.85Ca0.15) (Zr0.1Ti0.9)O3-xCeO2 lead-free ceramics using a twostep sintering technique
(TAYLOR & FRANCIS LTD, 2019-10-29)(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3-xCeO2, (BCZTCe) lead-free piezoelectric ceramics were processed conventionally using a two-step sintering technique. The results suggest that two-step sintering is an effective technique to ... -
Densification of Magnesium Aluminate Spinel Using Manganese and Cobalt Fluoride as Sintering Aids
(MDPI, 2020-01-01)Highly dense magnesium aluminate spinel bodies are usually fabricated using pressure-assisted methods, such as spark plasma sintering (SPS), in the presence of lithium fluoride as a sintering aid. The present work investigates ... -
Transparent alumina ceramics: Effect of standard and plasma generated stabilizing approaches in colloidal processing
(Wiley, 2019-10-04)The study is focused on an optimization of the slipcasting process used for the fabrication of the transparent/translucent alumina ceramics; more precisely, on specifying the most appropriate way to stabilize the cast ...
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