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  • 1
    Electronic Resource
    Electronic Resource
    Application of a Tough Surface Layer to a Fiber-Bonded Composite (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), 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: The feasibility of creating “tough surface material” using oxide-fiber-reinforced oxide matrix ceramics was studied. Al2O3 fiber/(ZrO2, Al2O3) matrix composite was used as the surface material of a Si–Ti–C–O-fiber-bonded composite. The sintering of the matrix (ZrO2 and Al2O3) of the surface composite layer (SCL) and its bonding to the fiber-bonded composite (FBC) were done simultaneously by vacuum hot pressing. A spherical indentation test demonstrated the advantage of the SCL in reducing the damage of the base FBC from an indenter, because the high fracture resistance of the surface composite layer could reduce the stress concentration by the cumulative microfracture process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03525.x
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature Dependence of Tensile Strength for a Woven Boron-Nitride-Coated Hi-Nicalon™ SiC Fiber-Reinforced Silicon-Carbide-Matrix Composite (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), 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: The temperature dependence of tensile fracture behavior and tensile strength of a two-dimensional woven BN-coated Hi-Nicalon™ SiC fiber-reinforced SiC matrix composite fabricated by polymer infiltration pyrolysis (PIP) were studied. A tensile test of the composite was conducted in air at temperatures of 298 (room temperature), 1200, 1400, and 1600 K. The composite showed a nonlinear behavior for all the test temperatures; however, a large decrease in tensile strength was observed above 1200 K. Young's modulus was estimated from the initial linear regime of the tensile stress–strain curves at room and elevated temperatures, and a decrease in Young’s modulus became significant above 1200 K. The multiple transverse cracking that occurred was independent of temperature, and the transverse crack density was measured from fractographic observations of the tested specimens at room and elevated temperatures. The temperature dependence of the effective interfacial shear stress was estimated from the measurements of the transverse crack density. The temperature dependence of in situ fiber strength properties was determined from fracture mirror size on the fracture surfaces of fibers. The decrease in the tensile strength of the composite up to 1400 K was attributed to the degradation in the strength properties of in situ fibers, and to the damage behavior exception of the fiber properties for 1600 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00961.x
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  • 3
    Electronic Resource
    Electronic Resource
    Creep and Fatigue Behavior in Hi-Nicalon-Fiber-Reinforced Silicon Carbide Composites at High Temperatures (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), 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: Monotonic tension, creep, and fatigue tests of a composite where a silicon carbide (SiC) matrix that contains glass-forming, boron-based particulates has been reinforced with Hi-Nicalon™ fiber (Hi-Nicalon™/SiC) were conducted in air at 1300°C, and creep tests also were conducted in argon at 1300°C. The ultimate tensile strength (UTS) of the Hi-Nicalon™/SiC composite was similar to that of a SiC composite where a pure SiC matrix is reinforced with Nicalon fiber (standard SiC/SiC) and a SiC composite where a matrix of glass-forming, boron-based particulates is reinforced with Nicalon™ fiber (enhanced SiC/SiC); however, the strains at UTS of the Hi-Nicalon™/SiC composite and the enhanced SiC/SiC composite were much larger than that of the standard SiC/SiC composite. The Young's modulus of the Hi-Nicalon™/SiC composite was ∼140 GPa, which is higher than that of the enhanced SiC/SiC composite (90 GPa) and lower than that of the standard SiC/SiC composite (200 GPa) at a temperature of 1300°C. The minimum strain rates of cyclic creep (fatigue) were lower than those of static creep. The time to rupture under creep loads was slightly shorter than that under fatigue loads at a given maximum stress. The creep strain rates of the Hi-Nicalon™/SiC composite in air were lower than those in argon. Consequently, the time to rupture at a given stress in air was longer than in argon. The creep and fatigue resistance of the Hi-Nicalon™/SiC composite both were similar to that of the enhanced SiC/SiC composite but were much better than that of the standard SiC/SiC composite in air. However, in argon, the standard SiC/SiC composite had the lowest creep rate, whereas the enhanced SiC/SiC composite had the highest creep rate. The time to rupture of the standard SiC/SiC composite was the shortest and the Hi-Nicalon™/SiC composite had the longest life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01731.x
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature Effect on Hydrogen Generation by the Reaction of γ-Al2O3-Modified Al Powder with Distilled Water (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: The effect of temperature on the reaction of γ-Al2O3-modified Al powders with distilled water was investigated. It was found that by increasing the temperature up to 40°C, the hydrogen generation speed can be enhanced one to two orders of magnitude relative to that at room temperature (18°C). X-ray analyses and transmission electron microscopy observations revealed that the reaction by-product at 40°C is bayerite (Al(OH)3), which is chemically neutral. The present results imply that slightly increasing the temperature is an effective way to get the target hydrogen generation speed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00534.x
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  • 5
    Electronic Resource
    Electronic Resource
    Tensile Fracture Behavior and Strength of Surface-Modified SiTiCO Fiber SiC-Matrix Minicomposites Fabricated by the PIP Process (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), 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: The effect of surface-modified SiTiCO (Tyranno®) fiber on the tensile behavior of SiC-matrix minicomposites has been examined. Standard SiTiCO fiber and two kinds of surface-modified fibers were used and the composites were fabricated by a polymer infiltration pyrolysis process. The strengths of the surface-modified-fiber-reinforced minicomposites were significantly improved compared to that of the standard fiber minicomposite. The scattering of tensile strength also decreased with the use of surface-modified fibers. The results demonstrate the achievement of SiTiCO-fiber-reinforced SiC-matrix composite by modifying the surface chemistry of the fiber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01213.x
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  • 6
    Electronic Resource
    Electronic Resource
    Creep and Fatigue Behavior in an Enhanced SiC/SiC Composite at High Temperature (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), 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: The monotonic tension, creep, and fatigue behavior of an enhanced SiC/SiC composite was investigated at a temperature of 1300°C in air and argon. The improved creep and fatigue resistances were determined and compared to those of the standard SiC/SiC composite. The effects of additives (glass-forming, boron-based particulates) in the matrix on the creep and environmental resistance of the enhanced SiC/SiC composite were discussed. Crack propagation in the matrix of the enhanced SiC/SiC composite was different from that in the standard SiC/SiC composite. The filling of the glassy phases in the cracks prohibited the diffusion of oxygen from the environment. As a result, creep and fatigue properties in the enhanced SiC/SiC composite in air at high temperatures was improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02621.x
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  • 7
    Electronic Resource
    Electronic Resource
    Strength of a Hi-Nicalon™/Silicon-Carbide-Matrix Composite Fabricated by the Multiple Polymer Infiltration-Pyrolysis Process (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), 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 woven-fabric Hi-Nicalon™-fiber reinforced SiC-matrix composite has been fabricated by using a multiple polymer infiltration-pyrolysis (PIP) process. The three-point bend strength, at room temperature, of the composite is examined as a function of total porosity of the composite. The porosity of the composite decreases as the number of PIP cycles (N) increases. Both the proportional-limit load and the maximum load in the three-point bend test increase as N increases. A compressive fracture mode is observed for N 〈 10 (total porosity of 〉10%), and a tensile fracture mode is observed for N greaterthan equal to 10 (total porosity of lessthan equal to10%). For the composite with N= 14, with a total porosity of 8 vol%, a proportional-limit stress of 410 MPa and a maximum stress of 600 MPa are achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01960.x
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  • 8
    Electronic Resource
    Electronic Resource
    Aqueous Dispersion of ZrB〈sub〉2〈/sub〉 Powder - Effect of Surface Corrosion and Dispersant (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1525-1528 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Hydrolysis and dispersing behavior of aqueous ZrB2 slurry were investigated. Theisoelectric point (IEP) of ZrB2 slurry was measured to be pH 6.3. The acid and base slurryunderwent rather rapid change of pH after fabrication for one and three hours, respectively. Theoxygen content of the boride powder increased slowly with static ageing time in acid and neutralslurries, while the value decreased in base slurry. Application of poly(ethyleneimine) changed IEPof the boride slurry to pH 10.4. Sedimentation test informed that stability of the slurry wasimproved when increasing the molecular weight of poly(ethyleneimine) to 70,000 and in acid slurry(pH 3)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1525.pdf
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Three Dimensional Crack-Fiber Interaction Process in Fiber-Reinforced Ceramic Matrix Composite: Model Experiment (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 164-165 (July 1998), p. 241-244 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/45/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.164-165.241.pdf
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