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Search results for: CERAMIKA TLENKOWA
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Thermal and technological aspects of double face grinding of Al2O3 ceramic materials
PublicationDouble face grinding with planetary kinematics is a process to manufacture workpieces with plan parallel functional surfaces, such as bearing rings or sealing shims. In order to increase the economic efficiency of this process, it has to be advanced permanently. The temperature in the contact zone of most grinding processes has a huge influence on the process efficiency and the workpiece qualities. In contrast to most grinding...
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Wear of electroplated diamond tools in lap-grinding of Al2O3 ceramic materials
PublicationCurrent development of modern products, together with ever-increasing demands for their operation and usage, necessitate the search for new processing methods. Abrasive machining is widely used in many industrial areas, especially for processing difficult-to-machine materials such as advanced ceramics. Grinding with lapping kinematics, also called lap-grinding, is still one of the innovative methods of abrasive processing being...
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Surface Texture Analysis of Hardened Shafts after Ceramic Ball Burnishing
PublicationThis article represents the results of testing the surface condition of shafts manufactured by the burnishing process. The shafts with a hardness of approximately 62 HRC (Rockwell C). were burnished with a ceramic ball (Si3N4), where the force range was controlled by the means of a hydraulic system. The machining process consisted of hard turning shafts with cubic boron nitride (CBN) inserts, followed by burnishing with the use...
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Thermal properties of ceramic Bi2VO5.5 and strontium–borate glass-ceramics containing crystalites of Bi2VO5.5. measured with DSC
Open Research DataThermal properties of ceramic Bi2VO5.5 and strontium–borate glass-ceramics containing Bi2VO5.5 crystallites was measured by DSC.
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Wpływ dawkowania zawiesiny ściernej na efekty docierania powierzchni płaskich
PublicationPrzedstawiono wyniki badań dawkowania zawiesiny ściernej podczas docierania powierzchni płaskich. Określono wpływ wielkości dawki ścierniwa na wydajność obróbki i podstawowe parametry chropowatości powierzchni. Obrabiano elementy z ceramiki tlenkowej oraz miedziane.
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Analiza czasochłonności docierania technologicznego powierzchni płaskich w operacjach montażowych.
PublicationPrzedstawiono wyniki analiz docierania i mikroszlifowania elementów płaskich na docierarce jednotarczowej mikroziarnami węglika krzemu. Obrabiano elementy ze stali 100Cr oraz z tlenkowej ceramiki technicznej Al2O3. Analizowano czas obróbki i koszty operacji.
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International Journal of Applied Ceramic Technology
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International Journal of Ceramic Engineering and Science
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Ocena teoretycznych metod wyznaczania stężenia tlenków azotu w gazach wylotowych z silnika o zapłonie samoczynnym zasilanego ciekłym paliwem alternatywnym
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(Bi,Pb)-Sr-Ca-Cu-O glass-ceramics - superconductor and granular metal
PublicationW materiale o składzie (Bi,Pb)-Sr-Ca-Cu-O wskutek stosowania różnych warunków wytwarzania można otrzymać materiały o różnorodnych właściwościach. W efekcie wygrzewania materiał amorficzny częściowo krystalizuje. To powoduje wzrost rozmiaru i zawartości przewodzących i nadprzewodzących granul oraz zmniejszenie szerokości izolujących barier pomiędzy granulami. Zależność temperaturowa oporu słabo skrystalizowanego materiału jest funkcją...
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Impact of the addition of dolomite to cream‐firing clays on the technological and color properties of sintered ceramics
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Fabrication methods of porous perovskite type ceramics for Solid Oxide Fuel Cells (SOFCs)
PublicationPublikacja opisuje metody wytwarzania porowatych materiałów ceramicznych o strukturze perowskitu.
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The effect of lithium fluoride on the thermal stability and thermoluminescence properties of borosilicate glass and glass-ceramics
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Electrochemical study of lithium insertion into carbon-rich polymer-derived silicon carbonitride ceramics
PublicationW pracy przedstawiono materiał ceramiczny, bogaty w węgiel krzemo azotek węgla (SiCN), otrzymany na drodze pirolizy w zakresie temperatur od 1100 do 1700°C. Badania elektrochemiczne insercji litu wykazały, że materiał elektrodowy na bazie SiCN może być obiecujący jako anoda w bateriach litowych. Próbka otrzymana w 1300°C cechuje się pojemnością 392 mAh/g i jest stabilna aktywna elektrochemicznie w trakcie interkalacji i deinterkalacji...
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Influence of Phase Composition on Dielectric Properties of Bismuth-Based Ceramics with Scheelite-Type Structure
PublicationGoal of the present research was to study dielectric properties of BiNbO4 ceramics fabricated by solid state reaction route followed with pressureless sintering. The samples were fabricated from the mixture of oxides, viz. Nb2O5 and Bi2O3. Apart from stoichiometric amount an excess of 3%, 5% and 10% by mole of Bi2O3 was used. It was found that an excess amount of Bi2O3 oxide caused formation of Bi5Nb3O15 minor phase in amount of...
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X-Ray Diffraction, Mössbauer Spectroscopy and Magnetoelectric Effect Studies of Multiferroic Bi5Ti3FeO15 Ceramics
PublicationBi5Ti3FeO15 ceramics belongs to multiferroic class of materials. In this work it was prepared by solid-state sintering method and investigated by X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect measurements. As it was proved by X-ray diffraction studies the single-phase Bi5Ti3FeO15 compound was obtained. The Mössbauer investigations revealed paramagnetic character of the compound at room temperature as well...
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Wystawa indywidualna artystycznych poszukiwań w ceramice , kontynuacja projektu, "MISAeksperymentCERAMIKA"cz.2
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Effects of Ca2+, Mg2+, Na+, and K+ substitutions on the microstructure and electrical properties of GdCoO3 ceramics
PublicationGdCoO3-δ, Gd0.975Na0.025CoO3-δ, Gd0.98K0.02CoO3-δ, Gd0.98Ca0.02CoO3-δ, and GdCo0.99Mg0.01O3-δ ceramics were prepared via a solid-state reaction route. Among the dopants studied, substitution with Ca2+ slightly enhanced the densfication of GdCoO3 ceramics. All the lattice parameters of the doped ceramics were larger than those of pure GdCoO3-δ ceramic (a = 5.223 Å, b = 5.389 Å and c = 7.451 Å), and their cell volumes increased by...
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Mg2+ Doping Effects on the Structural and Dielectric Properties of CaCu3Ti4O12 Ceramics Obtained by Mechanochemical Synthesis
PublicationIn this study, ceramic CaCu3Ti4O12 (CCTO) and CaCu3−xMgxTi4O12 solid solutions in which 0.1 ≤ x ≤ 0.5 were prepared by the mechanochemical method, realized by a high‐energy ball milling technique. The effects of the Mg2+ ion concentration and sintering time on the dielectric response in the prepared ceramics were investigated and discussed. It was demonstrated that, by the use of a sufficiently high energy of mechanochemical treatment,...
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Mechanism of hopping conduction in Be–Fe–Al–Te–O semiconducting glasses and glass–ceramics
PublicationElectrical properties of beryllium-alumino-tellurite glasses and glass–ceramics doped with iron ions were studied using impedance spectroscopy. The conductivity was measured over a wide frequency range from 10 mHz to 1 MHz and the temperature range from 213 to 473 K. The D.C. conductivity values showed a correlation with the Fe-ion concentration and ratio of iron ions on different valence states in the samples. On the basis of...
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High-conducting Bi4V2-xFexO11-δ ceramics containing Fe2O3 nanocrystals: Structure and properties
PublicationThe topography, structure, thermal, magnetic, and electrical properties of Bi4V2-xFexO11-δ ceramics substituted with x = 0.5 and 0.7 Fe were studied. The microscope analysis showed the presence of iron-rich nanocrystals formed on the Bi-Fe-V-O grains. The X-ray diffraction studies confirmed that grains are built mostly of tetragonal Bi4V1.5Fe0.5O10.5 phase. Thermal properties analysis showed an order-disorder type γ ↔ γʹ phase...
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Wpływ zawiesiny ściernej dawkowanej w sposób wymuszony na wydajność docierania jednotarczowego elementów ceramicznych
PublicationPrzedstawiono zagadnienia związane z przygotowywaniem zawiesiny ściernej w docieraniu maszynowym powierzchni płaskich. W badaniach zastosowano wymuszony sposób dozowania zawiesiny na docierak żeliwny. Badano docieranie elementów z ceramiki tlenkowej zawiesiną na bazie mikroziaren węglika krzemu.
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Influence of Firing Temperature on Phase Composition and Color Properties of Ceramic Tile Bodies
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Change of the Phase Composition and Strength of Al2O3–ZrO2-Ceramic After Hydrothermal Aging
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Clarification of 1,3-Propanediol Fermentation Broths by Using a Ceramic Fine UF Membrane
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Application of ultrafiltration ceramic membrane for separation of oily wastewater generated by maritime transportation
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Modular Ceramic-Polymeric Device for Analysis of Selected Elements in Liquid Using Microplasma
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Wady powierzchniowe ceramicznych elementów tocznych = Surface cracks of ceramic rolling elements
PublicationMateriały ceramiczne posiadają kombinację optymalnych własności, które są niezbędne w zastosowaniach na wysoko obciążone elementy maszyn. Podstawowym problemem związanym z wytrzymałością zmęczeniową materiałów ceramicznych są wszelkiego rodzaju wady powierzchniowe będące efektem procesu wytwarzania lub wynikające z defektów struktury materiału ceramicznego. W artykule przedstawiono badania doświadczalne dwutlenku cyrkonu ze sztucznie...
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A Multi Rig Screening Test for Thin Ceramic Coatings in Bio-Tribological Applications
PublicationZaprezentowano metodę badań ogólnej charakterystyki tribologicznej cienkich powłok ceramicznych z wykorzystaniem równoległych testów na wielu stanowiskach o różnej konfiguracji styku powierzchni trących i przy ruchu o różnym charakterze (jednokierunkowym i posuwisto zwrotnym). Przedstawiono wyniki porównania przy pomocy jednoczesnej analizy wyników testów z różnych stanowisk; w wyniku testów uzyskano ranking powłok ze wskazaniem...
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A Multi Rig Screening Test for Thin Ceramic Coatings in Bio - Tribological Applications
PublicationA method is presented for the comparative testing of wear resistance of ceramic coatings made from materials potentially feasible in tribo - medical applications, mainly orthopaedic implants made from ceramics coated metals for low cost, long life and low wear particle emission into the body. The method was devised as the main tool for use in research and is comprised of flat on flat and ball on flat surface (sliding) tests. Seven...
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Performance and Stability in H2S of SrFe0.75Mo0.25O3-δ as Electrode in Proton Ceramic Fuel Cells
PublicationThe H2S-tolerance of SrFe0.75Mo0.25O3-δ (SFM) electrodes has been investigated in symmetric proton ceramic fuel cells (PCFC) with BaZr0.8Ce0.1Y0.1O3-δ (BZCY81) electrolyte. The ionic conductivity of the electrolyte under wet reducing conditions was found to be insignificantly affected in the presence of up to 5000 ppm H2S. The fuel cell exhibited an OCV of about 0.9 V at 700 °C, which dropped to about 0.6 V and 0.4 V upon exposure...
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Sensing properties of a mixed-potential type NOx sensor based on YSZ ceramic
PublicationW pracy przedstawiono wyniki badań czujnika typu ''mixed-potential''. Czujnik zbudowany jest na bazie YSZ z warstwą NiO. Zbadano właściwości czujnika w rożnych stężeniach NO2. Zbadano wpływ grubości warstwy NiO na właściwości czujnika.
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Structure and magnetic properties of BeO-Fe2O3-Al2O3-TeO2 glass-ceramic composites
PublicationIn this work, glass-ceramics in the xBeO–20Fe2O3–(80-x)TeO2 system with x = 0–25 mol% were synthesized by the traditional melt quenching route and studied by inductively coupled plasma optical emission spectroscopy, X-ray diffraction, confocal microscopy, infrared and Raman spectroscopy. BeO addition was found to support the crystallization process of Fe2O3 during melting, and an increased BeO content was associated with an increased...
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Tests for lapping of flat surfaces of ceramic elements with forced dosing of abrasive slurry
PublicationPrzedstawiono zagadnienia dotyczące systemu wymuszonego dawkowania zawiesiny ściernej w docieraniu jednotarczowym powierzchni płaskich. Opisano zalety takiego systemu dozowania płynnej zawiesiny ściernej. Omówiono wybrane wyniki badań docierania elementów z ceramiki technicznej. Analizowano wpływ podstawowych warunków dawkowania zawiesiny na ubytek liniowy próbek.
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Analysis of ring cracks in ceramic rolling elements using the boundary element method
PublicationCeramic materials have been increasingly used in bearing technology for over a dozen years. This is due to the characteristic properties of ceramic materials such as: high hardness, corrosion resistance, the possibility of use in aggressive chemical environments, as well as due to the lower specific weight compared to steel materials. However, the use of ceramic materials is connected with many limitations. The main disadvantages...
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Maria Gazda prof. dr hab. inż.
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Wykorzystanie metody sztucznych baz w badaniach wydajności docierania elementów ceramicznych.
PublicationPrzedstawiono metodę pomiaru ubytku liniowego docieranych elementów z ceramiki tlenkowej. W badaniach wykorzystano bazowe odciski Vickersa wykonane na stalowych próbkach kontrolnych. Pomiary przekątnych odcisków przeprowadzono przy pomocy mikroskopu stereoskopowego i kamery CCD, sprzężonej z programem komputerowym MultiScan v 6.08.
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Eu3+ doped tellurite glass ceramics containing SrF2 nanocrystals: Preparation, structure and luminescence properties
PublicationEu3+ doped tellurite glass ceramics containing SrF2 nanocrystals were prepared using melt quenching technique and subsequent heat treatment of glass in 370 °C for different time periods. Thermal properties of glass matrix have been determined based on DSC measurements. XRD and XPS results confirmed formation of SrF2 nanocrystals in glass matrices after annealing at 370 °C. FTIR studies revealed absorption bands in the range of...
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Evaluating the impact of ZnO doping on electrical and thermal properties of calcium-aluminosilicate oxynitride glass-ceramics
PublicationThis study aimed to investigate the impact of ZnO content on the structure, thermal, and electrical properties of oxynitride glass-ceramic(s) within the Ca–Al–Si–O–N (CASON) system. The base glass had the composition of Ca7Al14Si17O52N7, with ZnO additions ranging from 3 to 15 % by weight. A pristine Ca7Al14Si17O52N7 glass was successfully prepared by melt-quenching technique followed by converted into glass-ceramic by incorporating various...
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Effect of pyrolysis temperature on the microstructure and thermal conductivity of polymer-derived monolithic and porous SiC ceramics
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Electronic and ionic relaxations in strontium-borate glass and glass-ceramics containing bismuth and vanadium oxides
PublicationThe topography, microstructure and electrical properties of strontium-borate glass and SBO glass containing bismuth and vanadium oxides, were studied. The structure was measured using X-ray diffraction (XRD), Energy Dispersive X-ray Spectrometer (EDS) and Scanning electron microscope (SEM) methods. The A.C. complex conductivity was investigated as a function of temperature and frequency. The influence of the quantity of bismuth...
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Mössbauer Spectroscopy and Magnetoelectric Effect Studies of Multiferroic Ceramics Based on BiFeO<sub>3</sub>
PublicationIn this work the results of investigations for (BiFeO3)x(BaTiO3)1-x and Bi1-xNdxFeO3 solid solutions are described. Samples were prepared by the conventional solid-state sintering method. X-ray diffraction, 57Fe Mössbauer spectroscopy, and magnetoelectric effect measurements were applied as complementary methods to determine the structure and magnetic properties of materials. For (BiFeO3)x(BaTiO3)1-x solid solutions Mössbauer...
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Spectroscopic studies of Nb-doped tricalcium phosphate glass-ceramics prepared by sol-gel method
PublicationCalcium-phosphate based glasses and glass-ceramics play a crucial role in the tissue engineering development. Apart from their high biocompatibility and excellent ability to undergo varying degrees of resorbability1, they exhibit relatively high bioactivity and due to that they are commonly used as bone and dental implants. A substantial research effort is devoted to improve calcium-phosphate materials physico-chemical properties...
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Structural investigations of niobium-doped bioactive calcium-phosphate glass-ceramics by means of spectroscopic studies
PublicationSynthetic calcium-phosphate based glasses and glass-ceramics play a crucial role in the development of tissue engineering. These materials have a high biocompatibility with biological analogues, excellent ability to undergo varying degrees of resorbability and due to their non-toxicity and relatively high bioactivity they are commonly used as bone and dental implants. A substantial research effort is devoted to improve synthetic...
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Structure, luminescent properties and FDTD simulation of TeO2-BaO-Bi2O3-Ag:Ln3+ glass-ceramics system
PublicationTeO2-BaO-Bi2O3-Ag glass systems (TBB) co-doped with terbium and europium ions have been successfully synthesized through conventional melt-quenching technique. Heat treatment procedure at 350 °C has been conducted in order to synthesize silver nanoparticles embedded in TBB glass matrix. Structural measurements involved XRD studies that revealed no crystallization of glass structure after heat treatment at elevated temperatures....
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A novel approach for processing CaAlSiON glass-ceramics by spark plasma sintering: Mechanical and electrical properties
PublicationLithium containing glassy materials can be used as solid electrolytes or electrode materials for lithium-ion batteries due to their high energy density. Conventional melt-quenched Ca11Al14Si16O49N10 glass powder containing 24 e/o N, doped with Li-ions (1, 3, and 6 wt. %) and sintered by spark plasma sintering technique (SPS) was studied. The benefits of using SPS to produce glass-ceramics are rapid heating rates compared to conventional...
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The effect of Sr and Mg substitutions on structure, mechanical properties and solubility of fluorapatite ceramics for biomedical applications
PublicationIonic substitutions play important role in the modifications of biological apatites. Recently, attention has been focused on the co-doping effects on the functional properties of apatite-based biomaterials. In this research work, the dense samples of fluorapatites, Ca10(PO4)6F2 and Ca8MgSr(PO4)6F2, were produced after sintering at 1250 °C for 6 h in air. Structural characterization carried out with XRD, IR, Raman and SEM, confirmed...
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Kształtowanie jakości powierzchni w procesach docierania niekonwencjonalnego.
PublicationPrzedstawiono wyniki badań jakości docierania powierzchni płaskich niekonwencjonalnymi narzędziami ścierno-metalowymi na docierarce jednotarczowej o standardowym układzie kinematycznym. Analizowano obróbkę żeliwa oraz ceramiki tlenkowej. Tabletki ścierne wykonano z mikroziaren węglika boru. Badania przeprowadzono w ramach projektu KBN T07D 041 10.
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Evaluation of high-frequency roughness measurement errors for composite and ceramic surfaces after machining
PublicationPrecise characterisation of surface topography is of the greatest importance since many factors directly affect the accuracy of the whole measurement process. In this paper, the variety of surface topographies from machined composite and ceramic workpieces was studied with a special emphasis on the measurement results. Surfaces were subjected to the ground diamond, honing and milling processes. Measurement results were analysed...
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The effect of the ceramic dispersion on the nickel matrix composite coating properties after plastic working
PublicationW pracy określono wpływ fazy dyspersyjnej Al2O3 na wybrane potencjalne właściwości powłok kompozytowych o osnowie niklowej. Powłoki Ni-Al-Al2O3 zostały nałożone na próbki stalowe przy użyciu technologii poddźwiękowego płomieniowego natryskiwania cieplnego. Następnie poddane zostały obróbce plastycznej na zimno i na gorąco poprzez walcowanie, a także prasowania na zimno na prasie hydraulicznej. Obróbka plastyczna jest metodą alternatywną...