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  • 2005-2009  (4)
  • 2006  (4)
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  • 2005-2009  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Control of Shrinkage during Sintering of Alumina Ceramics Based on Master Sintering Curve Theory (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 11-14 
    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 Master Sintering Curve (MSC) is quite useful for analyzing the shrinkage behavior ofceramics. It is possible to compare shrinkage behavior using MSCs that are obtained from different firingprofiles. In this study, shrinkage behavior during sintering of green bodies of several kinds of Al2O3based ceramics were evaluated, using an electric furnace equipped with a dilatometer to be controlledbased on the MSC theory. Although all of the samples shrank monotonically, shrinkage behaviordepended on the additive and heating rate. The MSC theory was applied to analyze shrinkage behavior.As a result, a different MSC could be obtained in Al2O3 with and without the addition of MgO. In thepure Al2O3, a single MSC could be obtained from shrinkage curves by firing at a heating rate of7.5-20oC/min, though the shrinkage curve at a heating rate of 3-5oC/min did not correspond with theMSC. In contrast, shrinkage curves at heating rate of 5-20oC/min were converged in the case of the MgOdoped Al2O3 to obtain a unique MSC independent of firing profile. Apparent activation energy forsintering was estimated as 555 kJ/mol in the pure Al2O3 and 880 kJ/mol in the MgO doped Al2O3. Thefiring profile to obtain a requested sintering shrinkage curve was predicted from the resultant MSC. Acomparison between the predicted and the experimental shrinkage curves, showed good consistency,thus confirming that it is possible to control shrinkage behavior using the MSC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.11.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication and Evaluation of β-SiAlON Nanoceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 633-636 
    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: β-SiAlON nanoceramics were fabricated from β-SiAlON nano powder usingthe spark-plasma sintering (SPS) technique. The β-SiAlON nanopowder (Si4Al2O2N6)was synthesized from a mixture of SiO2 (QS-102, Tokuyama Co., Japan), AlOOH(Tomita, Japan) and C (Mitsubishi Chemical, Japan) using the carbothermal reductionnitridation (CRN) method. The heating rate for SPS was 50[removed info]/min. The β-SiAlONnanoceramics had high strength (500 MPa). TEM observation showed that theintergranular glassy phase was scarcely present at the grain boundary of the β-SiAlONnanoceramics. Aqueous corrosion resistance was evaluated by measuring the weightloss after soaking in 5 and 35 wt.% H2SO4aq. and 5 wt.% HNO3aq. at 80[removed info] for 100 h. Itwas found that β-SiAlON nanoceramics have much higher corrosion resistance thancommercialized silicon nitride ceramics in acid solutions. Commercialized Si3N4ceramics have an intergranular glassy phase created as a result of the sintering aids inthem. Thus, they are easily corroded by acid solutions because the intergranular glassyphase is easily corroded under such conditions. The excellent corrosion resistance of theβ-SiAlON nanoceramics stems from their glass-free grain boundaries, since theβ-SiAlON nanoceramics were produced without using a sintering aid
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.633.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical Properties of AlN-SiC Ceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 641-644 
    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: AlN-SiC ceramics with 0 to 75 mol% of AlN were fabricated through pressurelesssintering of very fine AlN and SiC. Powder compacts with different amounts of AlN were fired at2000°C for 1 h in Argon gas flow using an induction-heating furnace. The microstructure andphases present in the products were evaluated using SEM and XRD. The AlN-SiC ceramics had aporous structure with 30% porosity, and the grain size was increased with the addition of AlN. XRDanalysis showed that 2H was a main phase in all samples, though 3C and 6H phases were found in25 mol%AlN-75 mol%SiC ceramic. The electrical properties of the AlN-SiC ceramics wereevaluated at various temperatures ranging from room temperature to 300°C. The electricalconductivity of the AlN-SiC ceramics depended on the amount of AlN and on the temperature. The75 mol%AlN-SiC ceramic had higher electrical resistance, though the other samples were electricalconductors. The highest electrical conductivity was obtained with the 25 mol% AlN composition,which was 7 S/m at room temperature and 30 S/m at 300°C. The Seebeck coefficient for theAlN-SiC ceramics increased with rising temperatures. The AlN-SiC ceramics with 50 mol%AlNhad the highest Seebeck coefficient of 220 2V/K at 300°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.641.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Formation Mechanism of Nano AlN Powder by Gas-Reduction-Nitridation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 215-218 
    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: AlN powders were synthesized by gas-reduction- nitridation of γ-Al2O3 powders usingNH3 and C3H8 as reactant gases. AlN was identified from the products that synthesized at1100-1400 oC for 120 min in the NH3-C3H8 gas flow, and it was confirmed that AlN can be easilyfabricated by the gas-reduction-nitridation of γ-Al2O3. The products synthesized at 1100oC for120min contained unreacted γ-Al2O3. By the 27A1 MAS NMR spectra, Al-N bonding in the productincreased with an increase in the nitridation ratio of the tetrahedral AlO4 shoulder which decreasedprior to that of the octahedral AlO6 shoulder. It seems that γ-Al2O3 was preferentially nitrided fromAlO4 rather than AlO6. AlN nano particles were easily converted directly from γ -Al2O3 at a lowtemperature because the AlO4 within γ-Al2O3was preferentially nitrided
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.215.pdf
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    Paper (German National Licenses)
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