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  • 2005-2009  (17)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Low Temperature Sintering of AlN-SiC-TiB〈sub〉2〈/sub〉 System for the Fabrication of Continuous Fiber Reinforced Ceramic Composites (CFCC) (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1075-1078 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: We report sintering additive systems to decrease the densification temperature of thecorrosion resistant AlN-SiC-TiB2 system. Since oxide additives degrade the high temperatureproperties of the system, and other kinds of metallic additives may affect the formation of protectivemullite during oxidation, only the constituent elements were applied as additives. Dense samples ( 〉98 % relative density) could be fabricated at 1850 oC and 1900 oC by spark plasma sintering (SPS)and hot pressing method, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1075.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Heat-Resistant Silicon Carbide Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1409-1413 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: There has been a great progress in the development of heat-resistant silicon carbide ceramics,owing to the better understanding of composition-microstructure-properties relations. Based on theprogress, it has been possible to fabricate heat-resistant SiC ceramics with improved fracture toughness.In this paper, three rare-earth oxides (Re2O3, Re=Er, Lu, and Sc) in combination with AlN were used assintering additives for a β-SiC containing 1 vol% α-SiC seeds. The effect of intergranular phase, usingRe2O3 and AlN as sintering additives, on the microstructure and mechanical properties of liquid-phasesintered,and subsequently annealed SiC ceramics were investigated. The microstructure and mechanicalproperties were strongly influenced by the sintering additive composition, which determines the chemistryand structure of IGP. The strength and fracture toughness of the Lu2O3-doped SiC were ∼700 MPa at1400oC and ∼6 MPa.m1/2 at room temperature, respectively. The beneficial effect of the new additivecompositions on high-temperature strength was attributed to the crystallization of the intergranular phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1409.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Superplastic Deformation of Nano-Sized α-Sialon Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1001-1004 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In previous report, we succeeded in preparing dense nano-sized ceramics with the compositionof Y- α-sialon (m=1.35, n=0.675) by high-energy mechanical milling followed by spark plasma sintering.The superplastic deformation of the obtained nano-ceramics was studied in this report. A good ductility ofthe nano-sized ceramics has been confirmed, which arised from the nano-sized grains and large amount oftransient liquid phase. The effects of deformation on the phase and microstructural evolution were alsostudied. The nano-sized grains promoted the formation of elongated α-sialon grains during post-annealingat 1850oC for 3 h, which would strengthen and toughen the deformed ceramics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1001.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Simultaneous Synthesis and Consolidation of W-Added ZrB〈sub〉2〈/sub〉 by Pulsed Electric Current Pressure Sintering and their Mechanical Properties (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 527-530 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Dense zirconium boride (ZrB2)-based materials with and without tungsten (W) have beenfabricated directly from mixtures of constituent elemental powders by pulsed electric currentpressure sintering (PECPS) at 1800°C for 10 min under 30 MPa in a vacuum. Formation processesof monolithic, W-doped ZrB2 solid solutions (Zr1-xWx)B2 (0〈x≤0.12), and composites consisting ofZrB2(ss) and WB2 were investigated. Their mechanical properties of Vickers hardness (Hv), fracturetoughness (KIC), and bending strength (σb) at room temperature were evaluated. Solid solution andcomposite materials gave higher Hv (~20.7 GPa), KIC (∼4.4 MPam1/2), and σb (~600 and 690 MPafor the former and the latter, respectively) than those (14.1 GPa, 3.21 MPam1/2, and ~500 MPa) ofthe monolithic ZrB2 fabricated under the same conditions. Furthermore, the latter two materialsexhibited excellent high-temperature σb values (~550-600 MPa) up to 1600°C in N2, in comparisonwith that (~320 MPa) of monolithic ZrB2 materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.527.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    High-Temperature Properties of Silicon Nitride with Lu-Si-O-N Grain Boundary Phases (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 425-428 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: High-temperature properties of silicon nitride ceramics with Lu-silicon-oxynitride grainboundary phases were investigated. Si3N4 powder with 1.2 mol% (SN12) and 4.8 mol% (SN48) ofLu2O3 were gas-pressure hot-pressed at 1950°C for 2 h under 20 MPa in 1 MPa N2. SN12 consisted ofelongated β-Si3N4 and a secondary phase, Lu4Si2O7N2, whilst SN48 consisted of elongated β-Si3N4and Lu4Si2O7N2 + Lu2SiO5. At 1500°C and 1600°C, the stress-strain curve of SN48 was nonlinear,whilst that of SN12 was linear, indicating that SN12 broke as a brittle fracture at these temperatures.SN12 had excellent oxidation resistance and weight gain during the oxidation at 1500°C for 1000 hwas 4 g/m2. Creep lifetime of SN12 at 1500°C under tensile stress of 137 MPa exceeded 1678.5 h
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.425.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication of α-Sialon Nano-Ceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 629-632 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Y- α-sialon (m=1.35, n=0.675) ceramics were prepared by high-energy mechanicalmilling followed by spark plasma sintering. The milling promoted not only liquid-phase sintering,but also phase transformation from β-Si3N4 to α-sialon. Under the same holding time of 5 min,milled powder could be completely densified at 1500oC, which is about 250oC lower than thatrequired for as-received powder. The temperature where the phase transformation finished was1600oC and 1750oC for milled and as-received powder, respectively. The grain size of obtaineddense ceramics from milled powder was significantly decreased. Nano-sized dense ceramics havebeen obtained by sintering the milled powder at 1500oC for 5 min. Although 100 % α-sialon has notbeen achieved, the nano-sized ceramics can be used for superplastic deformation, taking advantageof small grain size and large amount of transient liquid phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.629.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of Nano-Hetero-Structured Dy Doped CeO2 Solid Electrolytes Using a Combination of Spark Plasma Sintering and Conventional Sintering (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Doped ceria (CeO2) compounds are fluorite-type oxides that show oxide ionic conductivity higher than yttria-stabilized zirconia in oxidizing atmosphere. As a consequence of this, considerable interest has been shown in application of these materials for “low” (500°–650°C) temperature operation of solid oxide fuel cells (SOFCs). To improve the conductivity in dysprosium (Dy) doped CeO2, nano-size round shape particles were prepared using a coprecipitation method. The dense sintered bodies with small grain sizes (〈300 nm) were fabricated using a combined process of spark plasma sintering (SPS) and conventional sintering (CS). Dy-doped CeO2 sintered body with large grains (1.1 μm) had large micro-domains. The conductivity in the sintered body was low (−3.2 S/cm at 500°C). On the other hand, the conductivity in the specimens obtained by the combined process was considerably improved. The micro-domain size in the grain was minimized using the present process. It is concluded that the enhancement of conductivity in dense specimens produced by the combined process (SPS+CS) is attributable to the microstructural changes within the grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00260.x
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  • 8
    Electronic Resource
    Electronic Resource
    New Strategies for Preparing NanoSized Silicon Nitride Ceramics (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: We report the preparation of nanosized silicon nitride (Si3N4) ceramics via high-energy mechanical milling and subsequent spark plasma sintering. A starting powder mixture consisting of ultrafine β-Si3N4 and sintering additives of 5-mol% Y2O3 and 2-mol% Al2O3 was prepared by high-energy mechanical milling. After milling, the powder mixture was mostly transformed into a non-equilibrium amorphous phase containing a large quantity of well-dispersed nanocrystalline β-Si3N4 particles. This powder precursor was then consolidated by spark plasma sintering at a temperature as low as 1600°C for 5 min at a heating rate of 300°C/min. The fully densified sample consisted of homogeneous nano-Si3N4 grains with an average diameter of about 70 nm, which led to noticeable high-temperature ductility and elevated hardness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00187.x
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  • 9
    Electronic Resource
    Electronic Resource
    Fabrication of Heat-Resistant Silicon Carbide Ceramics by Controlling Intergranular Phase (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 287 (June 2005), p. 299-310 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of glassy-phase, using AlN and Lu2O3 as sintering additives, on themicrostructure and mechanical properties of liquid-phase-sintered, and subsequently annealed SiC ceramics was investigated. The microstructure was strongly influenced by the sintering additive composition, which determines the intergranular phase (IGP). The average thickness of SiC grainsincreased with increasing the Lu2O3 /(AlN + Lu2O3) ratio, whereas the average aspect ratio decreased with increasing the molar ratio. The homophase and heterophase boundaries of the SiC ceramics were completely crystalline in all specimens. The room temperature (RT) strength decreased with increasing the molar ratio whereas the RT toughness showed a minimum at the molar ratio of 0.6. The best results at RT were obtained when the molar ratio was 0.2. The flexural strength and fracture toughness of the ceramics were 〉700 MPa and ~6 MPa.m1/2 at RT. The high temperature strength was critically affected by the chemistry, especially the content of Al in the IGP. The best strength at temperatures ³ 1500oC was obtained when the molar ratio was 0.5. Flexural strengths of the ceramicsat 1500oC and 1600oC were 610 ± 80 MPa and 540 ± 30 MPa, respectively. The beneficial effect of the new additive compositions (Lu2O3-AlN) on high-temperature strength of SiC ceramics was attributed to the crystallization or removal of IGP and introduction of Al into SiC, i.e., removal or reduction of Al content from the IGP, resulting in an improved refractoriness of the IGP
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.287.299.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Bulk Consolidation of Non-Oxide Ceramic Powders Derived from Polymer Precursors (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 15-18 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Consolidation of pyrolyzed powders has been tried by hot isostatic pressing (HIP) withoutsintering additives, in order to obtain dense non-oxide ceramic bulk materials derived from polymerprecursors. Si1.0C1.6N1.3 ceramic powders were derived from a polyvinylsilazane polymer. Thepolymer was thermally crosslinked at 250oC and pyrolyzed at 1050oC under Ar atmosphere. Thepyrolyzed powders were die-pressed into rectangular bars at room temperature and densified by HIPat 1400oC-900 MPa and 1500oC-950 MPa. Dense ceramic monolith, in which pores were notobserved by optical microscopy, was obtained by the HIP consolidation at 1500oC-950 MPa. Themicrostructure of the ceramic monolith was a nano-composite structure consisted of α-Si3N4 andgraphite phases. In the compression tests of the HIP-treated sample, slight plastic deformation wasobserved at 1400 and 1500oC in spite of high compressive stress over 1000 MPa. On the other hand,the sample showed a compressive strain of about 7% at 1000 MPa at 1600oC. The compressive strainof about 11% was achieved at 1700oC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.15.pdf
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