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  • Articles  (121,204)
  • 2005-2009  (70,777)
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  • Articles  (121,204)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis, Characterization and Sintering Behavior of Nanocrystalline Cordierite Ceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 242-247 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Nanocrystalline cordierite powders were prepared by the polymerized complex method.The synthesized precursor was calcined in air at 600-1200 oC for 1h, and the calcined powders werefully characterized by TG/DTA, BET, XRD, SEM, and TEM. The XRD and selected-area electrondiffraction (SAED) analysis confirmed the development of the phase composition of cordieritepowders showing amorphous phase after calcination at temperature below 800oC, mixed phases ofspinel and μ-cordierite phase after calcination at 800oC and 900oC, and mixed phases of spinel, μ-cordierite and α-cordierite phases after calcination at above 900oC. The BET specific surface areasof the calcined powders varied from 3 to 107 m2/g, depending on calcination temperature. Thehighest specific surface area of 107 m2/g was found in the powders calcined at 800oC. The averageparticle sizes evaluated by BET were less than 60 nm, depending on calcination temperature. Thepowders calcined at 800oC and 1000oC were uniaxially pressed and pressureless-sintered in air at1250-1350oC for 2h. Densities of the sintered samples evaluated by Archimedes’s method were 87-91 % of theoretical value. The crystal structure of all the sintered samples, determined by XRD, wasmainly α-cordierite, having a small amount of spinel as second phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.242.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Novel Synthesis for Ultrafine Barium Titanate Powders Using Peptized Titania Nano-Sol (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 254-259 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: We have investigated a novel synthesis for highly spherical and ultrafine barium titanate(BaTiO3) powders using a peptized titania (TiO2) nano-sol as a precursor. The obtained TiO2nano-sol had the size less than 10 nm, which could be easily converted to BaTiO3 under 100 ℃. Thesize of the resulting BaTiO3 powder could be controlled from 42 to 167 nm by lowering the solutionconcentration from 1.00 M to 0.15 M. BET analysis indicated that the as-prepared BaTiO3 powdershad some porosity which was increased with the particle size. It was also found that the as-preparedBaTiO3 with smaller size had higher tetragonality and less intra-granular pores after annealing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.254.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of Indium Oxide Nanoparticles Prepared by Soft Chemistry Route (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 248-253 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Indium oxide, a wide band gap transparent conductor, is of great interest for manydevice applications due to its unusual combination of high transparency in the visible regionand high electrical conductivity. Several methods, comprising all three phases, namely, thesolid phase, the solution phase, as well as the vapor phase, have been used for the preparationof In2O3 powders and thin films. In this work, indium oxide nanoparticles were synthesizedby homogeneous precipitation using hexamethylenetetramine as ligand and indium nitrate orindium chloride as precursor materials. Thermogravimetry and differential thermal analysisresults evidenced the relatively low temperature for crystallization of indium oxide. Sphericalclusters consisting of about 8 nm of diameter indium oxide nanoparticles were obtained afterthermal decomposition at 400 ºC for 2 h, as revealed by X-ray diffraction experiments andnitrogen adsorption measurements. Transmission electron microscopy observations confirmthe single-crystalline nature of the prepared nanoparticles. This material exhibitsphotoluminescence emission at room temperature with peak onset at 315 nm as aconsequence of the small size of the particles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.248.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Study of Pseudoboehmite Synthesis by Sol-Gel Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 260-265 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: A pseudoboehmite was obtained by sol-gel synthesis using aluminum nitrateas precursor. It was used a 2n full factorial design for studying the effect of thetemperature of synthesis, the concentration of ammonium hydroxide, and the radiationdose in the product of sol-gel synthesis. The product of the synthesis was analyzed byscanning electron microscopy, x-ray diffraction of the product (after firing thepseudoboehmite at different temperatures), and it was also analyzed the temperature ofendothermic and exothermic transformations using the thermo gravimetric analysis(TG) and differential scanning calorimetry (DSC). The X-ray diffraction data show thatα-alumina was obtained at 1100o C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.260.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Formation Mechanisms of Sol-Gel Derived Cordierite (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 266-271 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Gels with cordierite stoichiometry, Mg2Al4Si5O18, were prepared by sol-gel technique usingthree different starting aluminum sources: nano-sized γ-Al2O3, aluminium nitrate nonahydrate andAl-sec-butoxide, as aluminum sources, using tetraetoxysilane (TEOS) and magnesium nitratehexahydrate in all three gels as sources for silicon and magnesium. The influence of Al-precursorson formation mechanism and sintering behavior of gels was studied by differential scanningcalorimetry (DSC), X-ray diffraction (XRD) and dilatometry. Gels calcined at 700°C werecharacterized by different specific surface area, pore sizes and different crystallization sequences.For gel with nano-sized γ-Al2O3 α-cordierite was formed at 1220°C through intermediate MgAl2O4phase. If aluminum was introduced as Al-sec-butoxide μ-cordierite crystallized in two steps (760and 1070°C) and the transformation μ-cordierite→α-cordierite occurred at 1250°C. WhenAl(NO3)3·9H2O was introduced as intermediate phase crystallized MgAl2O4 at ~870°C and μ-cordierite at ~950°C. Both phases reacted with amorphous silica forming α-cordierite at ~1210°C.Compacts prepared from gels with aluminum-nitrates and Al-sec-butoxide, respectively, sinteredbetween 700 and 1000°C, whereas the gel derived from γ-Al2O3 sintered in two steps; between 700-1000°C and 1010 and 1250°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.266.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Development of Near Net Shape Forming Processes of Ceramic Parts by Colloidal Processing (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 374-381 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Techniques for producing near net shape ceramic components using aqueous formingprocesses are reviewed. Particular focus is on three dimensional, complex shape forming by gelcasting and thin film forming by tape casting. Recent progress has been made in formulations thatrely on dispersion of submicron ceramic particles in aqueous solutions containing polymers such aschitosan or poly vinyl alcohol and a temperature activated crosslinking agent (DHF, 2,5-dimethoxy-2,5-dihydrofuran). These formulations can be produced to have low viscosity so that they caneither be poured or injected into complex shape molds or cast into tapes. After casting, thesuspension is heated to about 70 oC to activate the crosslinking agent. During crosslinking of thepolymer, the rheological and mechanical behavior of the suspension is changed from liquid-like tosolid-like. This allows the complex shaped bodies to be removed from the mold, dried and sintered.The strengthening of the cast tape due to crosslinking the polymer allows it to be dried withoutcracking. Rheological and mechanical behaviour, green and fired densities as well as examples offormed components will be presented. The green bodies can be readily machined with commonhigh speed tool steel tools
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.374.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Freeze Casting of Ceramic Components Using Ice Cores and Ice Moulds (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 391-396 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: A novel shaping technique for advanced ceramic components is presented which allowsmanufacturing of complex ceramic components with enclosed cavities by using ice moulds orice cores. Different suspensions of alumina and zirconia powders have been developed forthis special freeze casting technique. The suspensions must meet following requirements: highsolid content, the capability of flow, a freezing point between -10 and -2 °C, and a castingtemperature below 0 °C. After the casting process the moulds and cores could be easilyremoved by sublimation. The suspension liquid was removed in the frozen statesimultaneously. In this way very complicated hollow or filled structures such as metallic orceramic components encapsulated in ceramic shells could be produced. No de-moulding wasnecessary, no solid core must be removed, and no liquid phase appeared as known from otherlost-mould techniques. Ice mould casting is a very environmental-friendly shaping technique.Furthermore, the influence of dispersing agents, anti-freeze agents and of the freezing speedon the pore structure of the ceramic components has been investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.391.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Ink-Jet Printing of Ceramic Micro-Pillar Arrays (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 413-420 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.413.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    3-D Structures via Tape Casting and Lamination (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 397-406 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Miniaturisation and multi-functionality are the driving forces in the field of manytechnical market segments. Ceramic multilayer technology via tape casting and lamination isone of the key technologies to generate complex, highly integrated devices for future applications.The technique offers a tremendous potential for the integration of different materialscombined with the possibility to form complex 3-D structures by layered object manufacturing.The ceramic multilayer technology is based on shaping, screen-printing and stacking of individualceramic green tapes, which are laminated and co-fired. The tapes can offer ferroelectric,piezoelectric and magnetic behaviour, insulating and semi-conducting properties, voltage-,temperature- and atmosphere-dependent resistances, high thermal conductivity, corrosionresistance, or bio inert behaviour. For the integration of additional features like reactors or sensors,the described layered manufacturing method allows to introduce simultaneously microchannelsand other cavities. - New developments in processing and in materials concepts areaddressed to overcome limitations and to take maximum advantage of this technique. Thetechnique is illustrated considering e.g. microwave circulators for communication, sensors forautomotive applications, and piezoelectric actuators as examples, which demonstrate thepotential of the technology for the manufacture of highly integrated multifunctional systems
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.397.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Roll Pressed LZSA Glass-Ceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 442-446 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: This work reports some experimental results regarding to a Li2O-ZrO2-SiO2-Al2O3 (LZSA) sinteredglass-ceramic material obtained by roll pressing of glass powders (mean particle size ≈ 5 μm) withan added (7 wt.%) inorganic material (bentonite) as binder. The composition was characterizedusing chemical analysis, laser-scattering particle size analysis, DTA, XRD, thermal expansion,modulus of rupture (MOR) and deep abrasion (DA) measurements as well as density measurementsand SEM observations. From the results it was verified that the glass-ceramic materials obtained bysintering and controlled crystallization, in the 850-1030°C temperature range, of glass powders,have properties and characteristics decisively better than those of other traditionally used materials.It is concluded that roll pressing technology is a potential candidate to produce sintered glassceramicsfor many applications, such as, for example, large sheets panels for electrical and thermalinsulation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.442.pdf
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