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  • 2005-2009  (6)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Microstructural Variations in SiC Ceramics Sintered with AlN-Y〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 532-537 
    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: In this work, SiC ceramics were prepared by liquid phase sintering using 10 wt.% of AlNand Y2O3 mixtures in the proportion of 4:1 and 2:3 as additives Sintering was done in a graphiteresistance heated furnace at 2080oC under 0.2 MPa N2 atmosphere for 1h. Part of the samples wasfurther heat-treated at 2000oC for 4h to allow grain growth. The microstructures of the sinteredsamples were analyzed using polished and plasma etched surfaces. Furthermore, relative densities,weight loss during sintering and SiC-polytype distributions are reported
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.532.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamic and Dielectric Properties of MgSiN〈sub〉2〈/sub〉 Ceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 857-860 
    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: Reaction bonded MgSiN2 (RBMSN) was prepared by direct nitridation of aSi/Mg2Si/Mg/Si3N4 powder compact in a temperature range of 1350-1550°C. The oxygen contentof MgSiN2 was in the range of 0.4 – 0.6 wt%. A thermal stability examination showed that MgSiN2is stable up to 1400°C at 0.1 MPa N2 pressure. The activation energy of decomposition calculatedfrom the temperature dependence of weight loss is [removed info]H = 383 kJ⋅mol-1. The time dependence andnitrogen pressure dependence of MgSiN2 decomposition was also investigated at constanttemperature. MgSiN2 is stable at 1560°C in 0.6 MPa nitrogen atmosphere. Using these experimentaldata together with the heat capacity published in a literature the Gibbs free energy of formation ofMgSiN2 was calculated in a temperature range 300-2500 K.Dense MgSiN2 ceramics or MgSiN2/Si3N4 composites with fluorine-based additives wereprepared by hot pressing. The composite materials had a 4-point bending strength of 427 MPa andVickers hardness (HV1) of 20.8 GPa, respectively. The indentation fracture toughness was 5.3MPa.m1/2, due to the presence of elongated β-Si3N4 grains. The dielectric constant of dense reactionbonded MgSiN2 at 100 kHz was 9.5-10, while that of MgSiN2/Si3N4 composite in a wide range 50 –6000, depending on composition and heat treatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.857.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of the Rare-Earth Element on the Mechanical Properties of RE–Mg-Bearing Silicon Nitride (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: Silicon nitride bulk ceramics with varying compositions of the grain boundary phase but similar grain sizes were developed, which allows to analyze the influence of the grain boundary chemistry on mechanical properties. Micrographs of the crack path reveal a much weaker interface when the rare-earth element in the grain boundary phase changes from a small to a large rare-earth cation (RE3+). Room temperature measurements of toughness and bending strength show that weaker grain boundaries result in a higher toughness, but in a decreased strength of the bulk material. This investigation demonstrates that the mechanical behavior of silicon nitride can be readily tuned by chemical composition changes of the grain boundary phase, but that a compromise between toughness and strength has to be found when designing the material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00421.x
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  • 4
    Electronic Resource
    Electronic Resource
    Rare Earth Containing SiAlONS: Microstructure, Mechanical and Tribological Properties (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 287 (June 2005), p. 282-292 
    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: Silicon nitride based ceramics have been investigated since more than forty years.Nevertheless, a good understanding of the microstructure-properties relationships on the level of small samples is not enough to bring ceramic parts into the industrial market. More convincing is a demonstration of the excellent potential in specific applications where the requirements of a more complex system are considered. In this work, sialons are investigated for a use in lubricated wear applications. The target system is a fuel injection pump for pressures up to 30 MPa. It requires verysmall friction coefficients and wear rates. Isooctane was used as lubricating liquid. A friction coefficient of 0.3 has been achieved with a piston-on-plate configuration for two sialon ceramics with different a/b-ratios. The sample surfaces were in a ground condition. For comparison, tribological testing was also performed with commercial alumina and silicon nitride materials which exhibited higher friction coefficients. In order to be closer to the real conditions a test rig has been designed and constructed with a piston running in a cylinder that actually pumps isooctane at the desired pressures of up to 30 MPa. With it, the high potential of sialon ceramics for lubricated sliding applications was proven. In the fields of microstructural design neodymia and ytterbia containing sialons with varying a/b-sialon ratios and different amounts of additives have been investigated. These parameters have a strong effect on the achieved aspect ratios of the sialon grains which can be correlated to the amount of liquid phase during sintering, kinetic considerations andthe additives' cationic radii. Finally, the effect of these varying grain shapes on the mechanical properties hardness and fracture toughness has been determined
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.287.282.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Surface Structuring of α/β-Sialon Ceramics by Plasma-Etching (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 403 (Dec. 2008), p. 99-102 
    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: Effects of plasma etching on mixed /-sialon ceramics with different /-ratiowere investigated. A mix of CF4/O2 in a ratio of 2:1 was chosen as reactive gas. Parameters such as etching time and the material composition were examined. It was shown that -grains exhibit a larger etching rate than the grain boundary glassy phase or the -grains, generating pockets in a range of few µm. The so created surfaces were characterized both by scanning electron microscopy (SEM) and by atomic force microscopy (AFM) in contact mode. These complementary techniques also enabled the determination of the bearing ratio
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.403.99.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Subcritical Crack Growth of α/β-Sialon Ceramics in Distilled Water (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 403 (Dec. 2008), p. 129-132 
    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: Environmental-assisted subcritical crack growth on two different /-sialon ceramics is determined in static fatigue tests. The goal of these investigations was to determine the influence of delivering medium of high pressure pumps on their durability (life cycle). Therefore 4-point-bending bars were statically loaded in distilled water and subcritical crack growth was analyzed. The large number of spontaneous failure and survivals made the development of a modified testing procedure necessary in order to obtain a significant database
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.403.129.pdf
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