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Journal of KONES
EN The paper presents a numerical study of a two layer composite panel impacted by an AP (Armour Piercing) 14.5x118mm B32 projectile. The panel consists of a number of pyramid ceramic components supported by an aluminium plate. The studied model is compared with a reference structure in which ceramic l[...]
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Materials Science Poland
2013 Vol. 31, No. 4 555--560
EN Pure and cobalt doped (x = 0.05, 0.10, 0.15 mol %) polycrystalline potassium hexatitanate (K2Ti6O13) ceramics were synthesized using conventional solid state reaction route. XRD result confirmed the successful doping of Co in the K2Ti6O13 matrix, as no additional peak was observed in the pattern. Die[...]
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Journal of KONES
EN The paper presents a numerical study of the three layer composite panels impacted by an AP (Armor Piercing) 7.62x51mm projectile. The standard panel is built with aluminum and Al2O3 ceramic plate. The studied model, however, consists of the same aluminum plate but the ceramic one is surrounded by a [...]
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Materials Science Poland
2007 Vol. 25, No. 3 755--765
EN The paper reports on the results concerning the sol-gel preparation of the nanocrystalline nonsubstituted and Sr-substituted gadolinium aluminate (GdAlO3, GAP) ceramics at slightly varying conditions of synthesis. The metal ions, generated by dissolving starting materials of metals in the diluted ac[...]
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Materials Science Poland
2009 Vol. 27, No. 3 891--897
EN The crystalline microstructure, surface morphology, and the dielectric properties of BaZr0.2Ti0.8O3 (BZT) ceramics are investigated. From the X-ray diffraction pattern, it is found that the c-axis lattice parameter of the BZT ceramics is greater than the a-axis one. The temperature dependence of the[...]
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Materials Science Poland
EN Dense bulk Cr2AlC was synthesized by hot-pressing of Cr, Cr3C2 and Al powders as starting materials.The phase composition was determined by X-ray diffraction (XRD), the microstructures of the samples were observed with a scanning electron microscope (SEM) and thermal, electrical as well as the mecha[...]
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Materials Science Poland
EN Polycrystalline Ca1xLax(Ti0:5Fe0:5)O3 were prepared by the standard solid state reaction technique. Pellet shaped samples prepared from each composition were sintered at 1573 K for 5 h. The X-ray diffraction analysis indicated the formation of a single-phase orthorhombic structure. The lattice param[...]
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Advances in Materials Science
EN So far state of knowledge on biodegradable materials is reviewed. Among a variety of investigated materials, those composed of polymers and ceramics may be considered as only candidates for a core material in porous titanium alloy. The collagen and chitosan among natural polymers, polyhydroxy acids [...]
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Materials Science
EN Five specimens of Lu2O3:5%Eu were prepared using various synthesis techniques. One of the samples was in the form of a plate, air-sintered at 1775 °C. Radio- and photoluminescence spectra were recorded showing emission exclusively from the 5D0 level of Eu3+. The most intense radioluminescence, about[...]
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Przemysł Chemiczny
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Archiwum Nauki o Materiałach
PL Na licznych przykładach wykazano, że kompozytowe proszki - otrzymane na drodze spalania w fazie stałej - mogą być z powodzeniem używane do otrzymywania nowszych typów zaawansowanej ceramiki konstrukcyjnej. Rozpatrzono to w wypadku następujących materiałów: a) materiałów o strukturze dupleksowej; b) [...]
EN It has been indicated on a number of topical examples that solid combustion-derived composite powders can be advantageously used for fabrication of some advanced structural ceramics. The microstructure and method of producing have been considered for: a) materials with an interpenetrating (duplex) m[...]
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Materiały Ceramiczne
PL Z rentgenograficznie bezpostaciowego żelu uwodnionego tlenku cyrkonu podczas obróbki hydrotermalnej krystalizują cząstki ZrO2. Mechanizm ich wzrostu polega na łączeniu się cząstek w sposób uporządkowany krystalograficznie (koalescencja) i rozrastaniu się kontaktów poprzez rozpuszczanie się wypukłych[...]
EN Crystallization of the X-ray amorphous zirconia hydro-gel under hydrothermal conditions results in a powder composed of ZrO2 particles. The two step mechanism of their growth was identified: i) coalescence of the particles in an oriented manner and ii) growth of the contacts among them by the dissol[...]
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Elektronika : konstrukcje, technologie, zastosowania
PL Badano warunki syntezy i spiekania oraz wlściwości dielektryczne ceramiki opartej na relaksorze Pb(Mg1/3Nb2/3)O3 (PMN) i jego roztworacg stałych z typowymi ferroelektrykami PbTiO3 (PT) i BaTiO3 (BT). Otrzymano trzy rodzaje ceramiki PMN, PMN--PT, PMN--PT--BT o wartościach mak[...]
EN The conditions of synthesis and sintering processes as well as dielectric properties of ceramics based on Pb(Mg1/3Nb2/3)O3 (PMN) and solid solutions of this relaxor with normal reffoelectric PbTiO3 (PT) and BaTiO3 (BT) were investigated. Three kinds of ceramics: PMN, PMN--PT[...]
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Tribologia
1998 z. 2 148-167
PL Materiały ceramicane mają sporo zalet w porównaniu z konwencjonalnymi materiałamistosowanymi na węzły tarcia.Są one chemicznie obojętne, twarde i bardziej odporne na zużycie ścierne i erozyjne niż typowe stale stopowe. Mozna ich uzywać w znacznie wyzszych temparaturach-charakteryzują się znacznie mn[...]
EN Ceramics offer some advantages over conventional tribological mating elements.They are relatively inert,hard and more resistant to abrasive and erosive wear than typical alloy ateels. Ceramics can be used at much higher temperatures and corrode less than other regular metal tribological elements.Und[...]
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Materials Science Poland
2014 Vol. 32, No. 2 297--300
EN Ca2Ce2Ti5O16 dielectric ceramics prepared by conventional solid-state ceramic route was investigated. Phase composition and microwave dielectric properties were measured using XRD and Vector network analyzer, respectively. XRD analysis of the calcined and sintered samples revealed the formation of C[...]
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Acta Mechanica et Automatica
EN The paper presents example tests of the functional quality of selected designs of dental bridges. These were: porcelain bridges on a metal base (cobalt based alloy), porcelain bridges on a zirconia base (zirconia ceramic – Zirkon Zahn), and full zirconia bridges (Zirkon Zahn). For the purpose of the[...]
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Materials Science Poland
2015 Vol. 33, No. 1 122--125
EN Rare earth (RE) ions play an important role in the improvement of the optical properties of ceramics. Rare-earth ceramics are commonly used in display panels, fluorescent lamps and lasers. The luminescence properties of Magnesium Boro-Tellurite(MBT) Eu3+ and Dy3+ doped ceramics[...]
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Materials Science Poland
EN We report here the structural and electrical properties of Zn0:95M0:05O ceramic varistors, M = Zn, Ni and Fe. The samples were tested for phase purity and structural morphology by using X-Ray diffraction XRD and scanning electron microscope SEM techniques. The current-voltage characteristics J-E wer[...]
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Journal of Achievements in Materials and Manufacturing Engineering
EN Purpose: The purpose of this paper was to investigate the parameters which effect the results of determining the thermal conductivity of thermal barrier coatings (TBCs) by laser-flash method. Design/methodology/approach: The air plasma-spray (APS) technique was used to deposition of two- and three-l[...]
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Materials Science Poland
EN SrLa4Ti5-xSnxO17 (0 ≤ x ≤ 2) ceramics were fabricated through solid state ceramic route and their microwave dielectric properties were investigated in an attempt to tune their temperature coefficient of resonant frequency to zero. The compositions were sin[...]
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