Güncel Gönderiler: Seramik Mühendisliği
Toplam kayıt 272, listelenen: 41-60
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Nanocomposite PLZT ceramic materials in comparison with other processing technique for photostrictive application
(Ceramic Soc Japan-Nippon Seramikkusu Kyokai, 2001)The performance of photostrictive materials can be enhanced by controlling the materials and microstructural characteristics through processing methods, ceramic composition and dopant type/content. In this paper the influence ... -
An ultrasonic motor using a metal-ceramic composite actuator generating torsional displacement
(Japan J Applied Physics, 1998)An ultrasonic motor composed of three components; a stator, a rotor and a ball bearing is proposed. The stator is made of an active piezoelectric ring, poled in the thickness direction and bonded with two windmill-like ... -
Effect of ceramic processing methods on photostrictive ceramics
(Kluwer Academic Publ, 1999)Lanthanum-modified lead zirconate titanate (PLZT) ceramics (3/52/48) doped with 0.5 at.% WO3 were prepared by three different processing methods, coprecipitation, sol-gel and conventional oxide mixing techniques, to ... -
Influence of sample thickness on the performance of photostrictive ceramics
(Amer Inst Physics, 1998)Ferroelectric materials with high photovoltaic properties are of interest for new optical devices such as photostrictive ceramic actuators. However, fabrication of these devices requires development of materials exhibiting ... -
Investigation of the phase composition and stability of the alpha-SiAlONs by the Rietveld method
(Elsevier Sci LTD, 2002)Different compositions of Y- and Nd-alpha-SiAlONs were sintered at 1825 degreesC and analysed by the XRD method. The Rietveld technique was used for characterisation of the diffraction pattern and the x value of alpha-SiAlON, ... -
Frequency-tunable microwave dielectric resonator
(IEEE-Inst Electrical Electronics Engineers Inc, 2001)A new type of tunable composite dielectric resonator (DR) has been designed. In the structure of this DR, a controllable insert was used to change the resonance frequency (f(0)) in a wide spectral range, while preserving ... -
Luminescence properties of terbium-, cerium-, or europium-doped alpha-sialon materials
(Academic Press Inc Elsevier Science, 2002)… -
Preparation and fracture behavior of alumina platelet reinforced alumina-monazite composites
(Japan Inst Metals, 2002)Fracture behaviors were investigated in the laminated alumina composite ceramics. To improve the mechanical properties of alumina ceramics, templated grain growth (TGG) technique of alpha-Al2O3 platelet and LaPO4 as a ... -
Interphase boundaries between hexagonal boron nitride and beta silicon nitride in silicon nitride silicon carbide particulate composites
(Elsevier Sci LTD, 1997)Interphase boundaries between hexagonal boron nitride and beta-Si3N4 in hot isostatically pressed Si3N4-SiC particulate composites, in which boron nitride appears as a trace contaminant, have been examined using high ... -
The influence of zircon on the mechanical properties and thermal shock behaviour of slip-cast alumina-mullite refractories
(Elsevier Science BV, 2002)Mechanical properties of slip-cast alumina-mullite (AM) refractories were improved significantly by the addition of similar to 2-mu-m zircon (ZrSiO4) particles. Fracture behaviour showed mainly transgranular, with some ... -
Melting behaviour of glasses in the SrO-MgO-ZrO2-SiO2 system
(Soc Glass Technology, 1999)In the SrO-MgO-ZrO2-SiO2 system a large range of compositions with 60, 55, 50, 45, 40 and 35 wt% silica has been thoroughly investigated The effect of silica and other constituents on melting, annealing and colour variations ... -
Hydrothermal synthesis of lead titanate and lead zirconate titanate electroceramic particles
(Taylor & Francis LTD, 2003)Hydrothermal synthesis of two lead-based perovskite powder systems, lead titanate and lead zirconate titanate, was investigated. Phase-pure perovskite lead titanate and lead zirconate titanate with various morphologies ... -
Novel developments in alpha-SiAlON ceramics
(Trans Tech Publications LTD, 2000)Densification and stabilization of alpha-sialon ceramics have been investigated by using oxides of large cations (Sr2+, La3+, Ce3+, Nd3+) and their equimolar mixtures with calcium or ytterbium as a principal cation. All ... -
Hard and tough alpha-SiAlON ceramics
(Trans Tech Publications LTD, 2000)Yb, Nd/Ca and Ce/Ca containing a-sialon starting compositions have been densified by either pressureless sintering or capsul free sinter/HIP'ing using "conventional" alpha-Si3N4 powder. X-ray diffraction studies of both ... -
Preparation of multiple-cation alpha-SiAlON ceramics containing lanthanum
(Amer Ceramic Soc, 1999)Until recently, it was accepted that Ce3+ cations, with an ionic radius (r) of 1.03 Angstrom, were too large to form an alpha-SiAlON structure. However, more-recent studies have shown that cerium cations can be incorporated ... -
Wetting and non-wetting behaviour of silicon carbide grain boundaries
(Transtec Publications LTD, 1999)Silicon carbide (SiC) grain boundaries have been observed to be free from intergranular films. On the basis of equilibrium film thickness calculations, it has been proposed elsewhere that because SiC has very high refractive ... -
Capacitor discharge joining of silicon carbide based ceramics
(Trans Tech Publications LTD, 2002)A capacitor-discharge joining technique has been successfully used to join oxide ceramics using thin metal foils. In this study, silicon carbide (SiC) ceramic joints and silicon carbide-titanium diboride (TiB2) composite ... -
Orientation-dependent equilibrium film thickness at interphase boundaries in ceramic-ceramic composites
(IOP Publishing LTD, 1997)Theoretical considerations of the Hamaker constant for the interaction of two media across a third suggest that the highly anisotropic nature of the refractive indices of a medium such as h-BN will produce an orientation ... -
The crystallography of interphase boundaries between silicon carbide and silicon nitride in silicon nitride - Silicon carbide particulate composites
(Kluwer Academic Publ, 2000)Interphase boundaries between 3C SiC grains and two different beta-Si3N4 morphologies in Si3N4-SiC composites have been studied by transmission electron microscopy. In general, boundaries between small beta-Si3N4 intragranular ... -
Solid-state ceramic actuator designs
(Amer Inst Aeronaut Astronaut, 2001)Smart electromeehanical systems consist mainly of sensors, actuators, and data processing units. Actuators are the responding units of many smart systems including those for active vibration control and noise control. ...
