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  • 1
    Electronic Resource
    Electronic Resource
    Ablation-Resistance of Combustion Synthesized TiB2–Cu Cermet (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: TiB2–Cu ceramic–metal composites were prepared by combustion synthesis of elemental titanium, boron, and copper powders. The synthesized product consisted of two phases: TiB2 and copper. The addition of copper improved the strength and fracture toughness, thermal expansion coefficient, and thermal conductivity of TiB2. Thermal shock and ablation resistances of TiB2–Cu composites were studied using a plasma torch arc heater. Monolithic TiB2 failed catastrophically when the plasma arc flow reached the specimen surface. However, no cracks were found on the ablation surface of the TiB2–Cu ceramic–metal composites. The fractional mass loss was 4.09% for a TiB2–40Cu composite, which was close to the traditional W/Cu alloys. Volatilization of metal binder and mechanical erosion of TiB2 were observed to be the major ablation mechanisms. An ablation process model is proposed for the TiB2–Cu composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.00005.x
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation on Large-Sized Sapphire Crystalline Perfection by X-Ray Double-Crystal Diffraction Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1521-1524 
    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 large-sized sapphire (Ø225×205 mm, 27.5 kg) was grown successfully by SAPMACmethod (sapphire growth technique with micro-pulling and shoulder-expanding at cooled center).The surface quality of the specimens was characterized by micro-Raman spectroscopy, and doublecrystal X-ray diffractometry (DCD) was utilized to investigate its crystalline perfection. Themeasurement of rocking curves was performed on various specimens from different region of largesapphire boule. The experimental results showed that CMP (chemo-mechanical polishing) withsubsequent suitable chemically etching can develop the best-quality sapphire crystal surface and thevalues of FWHM obtained by conventional DCD were in the range from 27” to 58”. The infraredspectral transmission (2.0-4.5 5m) of sapphire crystal exceeded 82%. It is confirmed of SAPMACgrowth method characteristics with in-situ annealing, small temperature gradient and low residualstress level by numerical simulation analysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1521.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Pressure on TiB〈sub〉2〈/sub〉-Cu Composite via In-Situ Reaction Synthesis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1437-1440 
    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: TiB2-Cu matrix composites from titanium, boron and copper powders were in-situfabricated by exothermic reaction. The effect of the applied pressure on the mechanical properties of the composite was investigated. The results showed that when the applied pressure increasing, the relative density, bending strength, fracture toughness and hardness of the composites were on the increase due to the formation of fine microstructure and the improvement of densification with thepressure increasing. The high pressure is beneficial to the better mechanical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1437.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Hardness Performance of a SiCp/Al Composite by Pressureless Infiltration Technique (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1318-1321 
    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 the present work, a SiCp/Al composite was fabricated by pressureless infiltration ofaluminum alloy into loose-packed SiC particles preform, and its microstructure and hardnessperformance were investigated. The results showed that the composite was fully infiltrated and theparticles were distributed uniformly in the composite. Interfacial reactions were found in the as-castcomposite and the reaction product was identified as MgAl2O4 by TEM observation and XRDanalysis. The interfacial reactions enhanced the wettability and promote the spontaneous infiltrationprocess. The thermal exposure process increased the Brinell hardness of the composite. After thethermal exposure process, the block-like interfacial reaction products were distributed discretely, butthe amount of the reaction products was increased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1318.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Characteristics and Mechanisms of Dynamic Oxidation for ZrB〈sub〉2〈/sub〉-SiC Based UHTC (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1722-1726 
    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 study focuses on the dynamic oxidation resistance of five representative ZrB2-SiCbased ultra-high temperature ceramics (UHTCs): ZrB2-SiC, ZrB2-SiC-Si3N4, ZrB2-SiC-TiB2, ZrB2-SiCHfB2and ZrB2-SiC-ZrC using oxyacetylene torch and arc jet testing. The effects of second phase incorporation(Si3N4, TiB2, HfB2, ZrC) on oxidation resistance were compared and analyzed. The mechanism ofoxidation based on experimental results and thermodynamic calculations were explored. Someapproaches to improvement of oxidation resistance and future directions of UHTC are also presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1722.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Compressive Deformation Behavior of the Ferritic Oxide Dispersion Strengthened Alloys at Elevated Temperatures (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 412-415 
    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 compressive properties characterized as a function of the true stress-strain responseof the ferritic oxide dispersion strengthened (ODS) alloys, fabricated by mechanical alloying, wereexamined at strain rates ranging from 0.01 to 0.5s-1. Based on the differential scanning calorimeter(DSC) analysis, the solidus temperature of the ferritic ODS alloys is 1446oC. Therefore, thecompressive temperatures were chosen to be from 1050oC to 1300oC. Transmission electronmicroscopy (TEM) observation is indicative of the homogeneous distribution of the nano-yttriaparticles with the granularity of 100~200nm, which may exert a strong pinning effect on subgrains.The results indicate that flow stress of the ferritic ODS alloys enhances with decreasingcompressive temperature and increasing strain rate. Investigation of the strain rate sensitivityexponent and apparent activation energy of the ferritic ODS alloys has been carried out in detail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.412.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    In Situ Combustion Synthesis of h-BN-SiC High-Temperature Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1501-1504 
    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 feasibility of fabricating h-BN-SiC high-temperature ceramics by in-situ combustionsynthesis was demonstrated by igniting the mixture of boron carbide and silicon powder under100MPa nitrogen pressure. The reaction thermodynamics and the adiabatic combustion temperaturewere calculated theoretically. The phase composition, microstructure and mechanical properties ofcomposite were identified by XRD and SEM. The maximum bending strength and fracturetoughness of the composite were 65.2 MPa and 1.4 MPa·m1/2 under room temperature, respectively.The effects of h-BN and SiC dilution contents on the mechanical properties of composite were alsodiscussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1501.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of Microstructure on Cavity Nucleation in Creeping Ceramics Containing Viscous Grain Boundary Phase (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1084-1087 
    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 theoretical model considering the distribution of the grain sizes and grain-boundary ledgeswas developed for cavity nucleation in creeping ceramics containing viscous grain boundary phase. Thecritical stress involving the effects of various shapes of cavities and viscosity coefficient (η) for cavitynucleation was presented. Then, the local stress concentration factor concerning different distributions ofgrain-boundary ledges was calculated and discussed. The results showed that various shapes of cavitiesand η are not the main influencing factors on the critical stress. The stress concentration factor increaseswith the increase of grain-boundary ledge size or the density. Therefore, it would be liable to cause cavitynucleation at gain boundary when the density of grain-boundary ledges is high and the size is large
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1084.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of SiC Whisker-Reinforced ZrB〈sub〉2〈/sub〉 Ultra-High Temperature Ceramic (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1730-1732 
    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: SiC whisker-reinforced ZrB2 matrix ultra-high temperature ceramic were prepared at 2000°Cfor 1 h under 30MPa by hot pressing and the effects of whisker on flexural strength and fracture toughnessof the composites was examined. The flexural strength and fracture toughness are 510±25MPa and4.05±0.20MPa⋅m1/2 at room temperature, respectively. Comparing with the SiC particles-reinforced ZrB2ceramic, no significant increase in both strength and toughness was observed. The microstructure of thecomposite showed that the SiC whisker was destroyed because the SiC whisker degraded due to rapidatom diffusivity at high temperature. The results suggested that some related parameters such as the lowerhot-pressing temperature, a short sintering time should be controlled in order to obtain SiC whiskerreinforcedZrB2 composite with high properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1730.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of the Rare Earth Oxides on Sintering Behavior and Microstructure of ZrB〈sub〉2〈/sub〉-SiC Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1740-1742 
    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, two rare earth oxides, Y2O3 and La2O3, are used as the additives in the sintering ofZrB2-SiC composites to improve the sinterability and control development of microstructure duringdensification. The results show that the use of rare earth oxides (5vol.%) improves the powdersinterability, hindered excessive growth of matrix particles and increase fracture toughness of ZrB2-SiCcomposites, in comparison to ZrB2-SiC with additions free. Nearly full dense materials are obtained byhot pressing at 1900°C. XRD analyses indicate that lanthanum-containing phases were formed in thecomposite with La2O3. Microstructure observations by SEM reveal that the grain size of ZrB2-SiC withY2O3 and La2O3 composites are less than the sample without additives, which indicates Y2O3 and La2O3may restrain the grain growth and increase the fracture toughness. The fracture toughness of ZrB2-SiCcomposites with Y2O3 and La2O3 reached 5.0MPa·m1/2 and 5.5MPa·m1/2 respectively. Therefore, theadditive Y2O3 and La2O3 are very effective as sintering aids for the ZrB2-SiC composite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1740.pdf
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