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  • 2005-2009  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Bio-Inspired Processing of Ceramic Materials (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 643-651 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Ceramic processing without firing, sintering and expensive equipment represents agrowing research field within materials science. With respect to the search of new synthesispathways living nature provides paradigms for procedures that occur at ambient conditions and byapparently simple means. In this connection, biomineralization yields highly complexorganic/inorganic structures, e. g. within nacre or bones. In general, the formation of thesebiominerals involves organic molecules that act as templates during the mineralization of inorganicphases.Bio-inspired ceramic synthesis aims to imitate such principles by technical means. Accordingly,these routes consider the template-induced formation and the structural design of ceramics fromsolutions of suitable metal salts. This paper describes such routes by means of the preparation ofceramics like titania, vanadia, and zinc oxide. The influence of (bio)organic molecules (e. g.polyelectrolytes, self-assembled monolayers, amino acids, peptides and proteins) on the micro- andnanostructure formation and on the evolution of the morphology of these solids will be discussed.Furthermore, mechanical as well as functional properties of the obtained architectures are treated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.643.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of Ultrahigh-Temperature Si–B–C–N Ceramic from Polymeric Waste Gas (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: A “green” route to ultrahigh-temperature Si–B–C–N ceramic from vacuum-degassing waste gas of polyborosilazane {B[C2H4Si(CH3)NH]3}n (T2-1) has been developed. After gas-to-gel transformation, an amorphous ceramic Si5.3B1.0C19N3.7 was derived from the gel by dehydrocoupling and polymer-to-ceramic transformation. The ceramic started to form a nanostructure at 1700°C and resisted thermal degradation up to 2200°C in argon. This suggests that vacuum-degassing waste gases of polymer precursors may be perfect raw materials for various advanced ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00511.x
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Dispersion of Carbon Nanotubes in Polysilazanes for the Preparation of Reinforced Si-C-N Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 403 (Dec. 2008), p. 231-234 
    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 present contribution reports two different approaches to achieve a good dispersion of single-walled carbon nanotubes (SWCNTs) in a precursor-derived Si-C-N matrix, which represents an important prerequisite for attaining a high-performance material. The first approach involves the use of SWCNTs covalently functionalized by disilazane groups, aiming at enhanced interfacial interaction between the nanotube surface and the matrix. Within the second approach, the effect of an electrical field applied in the cross-linking step during the nanocomposite synthesis was studied toward the task of dispersing and simultaneously aligning the SWCNTs in the Si-C-N matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.403.231.pdf
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    Paper (German National Licenses)
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