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  • 2005-2009  (13)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Processing of Microcellular Mullite (2005)
    Malden, USA : 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 new processing route for manufacturing partially interconnected open-cell, microcellular mullite ceramics has been developed. The strategy adopted for making microcellular mullite ceramics entailed the following steps: (i) fabricating a formed body from combining polysiloxane, Al2O3 (a reactive filler), polymer microbeads (used as sacrificial templates), and Y2O3 (a sintering additive); (ii) cross-linking the polysiloxane in the formed body; (iii) transforming the polysiloxane by pyrolysis into SiO2; and (iv) synthesizing mullite by reacting SiO2 and Al2O3. By controlling the sintering temperature and the microbead and additive contents, it was possible to adjust the porosity so that it ranged from 38% to 85%. The compressive strengths of the microcellular ceramics with ∼40% and ∼70% porosities were ∼90 and ∼10 MPa, respectively. The superior compressive strengths were attributed to the homogeneous distribution of small (≤20 μm), spherical cells with dense struts in the microcellular ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00597.x
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of Open-Cell, Microcellular Silicon Carbide Ceramics by Carbothermal Reduction (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 novel processing route for developing open-cell, microcellular SiC ceramics has been developed. The strategy adopted for making microcellular SiC ceramics involved the following: (i) fabricating a formed body from a mixture of polysiloxane, phenol resin (used as a carbon source), polymer microbeads (used as sacrificial templates), and Al2O3–Y2O3 (an optional sintering additive); (ii) cross-linking the polysiloxane in the formed body; (iii) transforming the polysiloxane and phenol resin by pyrolysis into silicon oxycarbide and C, respectively; and (iv) synthesizing SiC by carbothermal reduction. By controlling the microbead and additive contents, it was possible to adjust the porosity so that it ranged from 60% to 95%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00509.x
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  • 3
    Electronic Resource
    Electronic Resource
    The Effect of Nitrogen Partial Pressure on Microstructure of Reaction Bonded Silicon Nitride (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 231-234 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The interaction between gas atmosphere and silicon during reaction bonded siliconnitride(RBSN)process leads to a non-uniform band formation of alpha silicon nitride. The reactionlayer, α -Si3N4, was formed near the surface of the sample in the early stage of RBSN. Reactivenitrogen gas was supplied as static state using computer controlled gas delivery system. Theformation of α -Si3N4 band near the surface of the sample can be explained thermodynamically,based on the nitrogen partial pressure in the gas mixtures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.231.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Modification of Inner Pores with Silicon Carbide Whiskers onto the Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Substrate by CVI Process (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 287 (June 2005), p. 212-219 
    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 this study, SiC whiskers were grown in porous alumina substrate in order to enhance the filtering efficiency, performance, and durability by controlling pore morphology. This experiment was performed by chemical vapor infiltration (CVI) in order to obtain the whiskers on the inside of pores as well as on the surface of porous the Al2O3 substrate. The deposition morphology was changed remarkably with the deposition position and temperature. First, the mean diameter of whisker was decreased as the position of observation moved into the inside of substratedue to ‘the depletion effect’ and ‘the pressure effect’. Second, the deposition temperature caused the changes of the deposition type such as debris, whiskers and films and these changes of morphology affect the various properties. When SiC films were deposited, the gas permeability and the specific surface area decreased. However, the whisker showed the opposite result; a large specific surfacearea provides the absorption site and the whiskers in gas traveling path hinder the particles from easily flowing. Comparing with the normal pores (inter-grain open pores), the pores formed by the whiskers have relatively large volume fraction under the same pore size. Porous ceramic filters with whisker will be expected to increase the filtering efficient and gas permeability simultaneously. It isthe main advantage of our whiskered filter. Therefore the porous alumina body which deposited the SiC whisker will be the promising material in order to apply to the particulate filter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.287.212.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Porous MoSi〈sub〉2〈/sub〉 Material Fabricated by SHS (Self-Propagating High Temperature Synthesis) Process (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 287 (June 2005), p. 226-232 
    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 this study, SHS process has been employed to fabricate porous MoSi2 material with electric-resistive heating capability through the control of pore size. The preform for SHS reaction was consisted of molybdenum powder with different sizes and silicon powder with different contained quantity. The size of the MoSi2 particles thus formed was determined by the generated heat of combustion, not by the size of molybdenum powder. However, the pore size of MoSi2 composite was proportional to the particle size of molybdenum powder. That is, the coarser the molybdenumpowder used, the larger the formed pore size. Based on these results, the porous MoSi2 composite could be fabricated with a desired pore size. By orienting the porous molybdenum disilicide-based material in the form of pore size gradient, porous materials used for filters with improved dirt-holding capacity can be manufactured
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.287.226.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication and Properties of Porous RBSN (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 287 (June 2005), p. 277-281 
    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: Porous silicon nitride was prepared by extrusion of silicon followed by nitridation at 1723 K. PMMA spheres with 20 µm in diameter were employed as the pore-forming precursors. b-silicon nitride whiskers were added to the dough for extrusion and their effect on the properties of porous RBSN were examined. The nitridation rate that was obtained from the weight change of the sample due to the nitridation process was between 75% and 80%. However, XRD patterns of the samples after nitridation had no Si peak. That means the actual nitridation rate of the sample was higher than that obtained from the weight change. Porosity of the sample was between 45% and 55%. The XRD patterns from the surfaces of the samples with the silicon nitride whiskers parallel and perpendicular to the extrusion direction showed a slight anisotropy. The pore size distributions of the samples showed a highly populated pores smaller than 3 micrometer, especially for thesamples with the whiskers. The room temperature flexural strengths of the samples were between 25 MPa and 35 MPa, the sample with 5 wt% whiskers showing the highest value. The microstructures of the samples contained pores with about 100 micrometer in diameter as well as fine pores with a few micrometer in diameter. Closer observation of the fracture surface of the samples revealed that fine whiskers were inside the pores. A small honeycomb was fabricated byreaction bonding of silicon
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.287.277.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and Refinement of β-SiAlON by Nitriding and Post-Sintering of Si Mixture (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 403 (Dec. 2008), p. 95-96 
    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: A cost-effective route to synthesize β-SiAlONs from Si mixture by reaction bonding followed by post-sintering was investigated. Three different z values, 0.45, 0.92 and 1.87 in Si6-zAlzOzN8-z, without excess liquid phase were selected to elucidate the mechanism of both SiAlON formation and densification. For the RBSN(reaction-bonded silicon nitride) specimens, nitridation rate of more than 90% was achieved by multistep heating up to 1400oC in flowing 5%H2-95%N2 and residual Si was not detected by XRD analysis. Increase in density was observed with z values for the post-sintered specimens and this tendency was well explained by the presence of higher amount of transient liquid phase with larger z values. Measured z values of the synthesized -SiAlONs were nearly similar to calculated values using starting compositions. The slight deviation in the two z values was successfully explained by the reasonable assessment of nitriding and post-sintering process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.403.95.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    The Effects of β-Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Whisker Content and Orientation on R-Curve Behaviors of Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Ceramics (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 287 (June 2005), p. 404-409 
    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 b–Si3N4 whisker randomly and unidirectionally reinforced Si3N4 composites were fabricated respectively. The high whisker alignment was obtained by extrusion processing. The R-curve behaviors were studied for the Si3N4 ceramics with addition of 3wt%, 5wt% and 10wt% b–Si3N4 whisker seeds respectively, and the effects of whisker orientation and content on the R-curve behaviors were analyzed and discussed. The ceramics with different whisker content and orientation showed well-defined R-curve behaviors. However, for the whisker random distribution, as its whisker content increased from 3wt% to 10wt%, the corresponding fracture toughness changed at an irregular trend; for the whisker unidirectional reinforcement, the fracture toughness in the direction perpendicular to whisker alignment was considerably improved, and most of indentation impressionstend to be very abnormal. The effects of whisker orientation and contents on the R-curve behaviors of the Si3N4 ceramics were further discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.287.404.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Colloidal Crystal Templating of Two-Dimensional Ordered Macroporous SiCN Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 135 (Feb. 2008), p. 27-30 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In this study, two-dimensional (2D) ordered macroporous SiCN ceramics were preparedby infiltrating sacrificial colloidal silica (SiO2) templates with the low molecular weight preceramicpolymer, polysilazane. This was followed by a thermal curing step, pyrolysis at 1250°C in a N2atmosphere, and finally the removal of the templates by etching with diluted HF. In particular,100large-scale monolayer silica crystals were prepared on the cleaned Si substrates by spin coating.Two-dimensional SiCN ordered pore arrays were fabricated by a solution-dipping template strategy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.135.27.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Processing of Polymer-Derived Microcellular Ceramics Containing Reactive Fillers (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 989-992 
    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: Processing techniques for producing microcellular silicon carbide, mullite, and cordieriteceramics with cell densities greater than 108 cells/cm3 and cells smaller than 30 μm have beendeveloped by a reaction method that incorporates a polysiloxane and reactive fillers. The techniquesdeveloped in this study offer substantial flexibility for producing microcellular ceramics wherebycell size, cell density, degree of interconnectivity, composition, and porosity can all be effectivelycontrolled. It is demonstrated that the adjustment of filler composition enables the possibility oftailoring the composition and properties of the microcellular ceramics. The present results suggestthat the proposed novel processing techniques are suitable for the manufacture of microcellularceramics with high morphological uniformity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.989.pdf
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