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  • 1
    Electronic Resource
    Electronic Resource
    Intragranular Particle Residual Stress Strengthening of Al2O3–SiC Nanocomposites (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: Al2O3/SiC ceramic nanocomposites were fabricated from nanocrystalline Al2O3 (10 nm in diameter) and SiC (15 nm in diameter) powders, and a theoretical model of intragranular particle residual stress strengthening was investigated. The SiC nanoparticles in the Al2O3 grains create a normal compressive stress at the grain boundaries and a tangential tensile stress in the Al2O3 grains, resulting in the “strengthening” of the grain boundaries and “weakening” of the grains. The model gives a good explanation of the experimental results of the authors and others which are difficult to be explained by the existing strengthening models, i.e. the maximum strength is normally achieved at about 5 vol% of SiC particles in the Al2O3–SiC ceramic nanocomposites. According to the model, there exists an optimum amount of SiC for strengthening, below which the grain boundaries are not fully “strengthened” and the fracture is mainly intergranular, above which the grains are “weakened” too much and the fracture is mainly transgranular, and at which the fracture is a mixture of intergranular and transgranular.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00309.x
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of Flaw Size Distributions Responsible for Size Effects in Strength of Small-Scale MEMS Specimens (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1425-1428 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: This paper describes a statistical method for evaluating the surface flaw distributionsresponsible for the improved strength and reliability of small-scale MEMS specimens. The methoduses a power-law function, which, though empirical in form, is consistent with the conventionaltwo-parameter Weibull distribution, to approximate the flaw size distributions on specimen tensilesurfaces. The parameters in the power-law function are determined from Weibull strength plots.Literature data for single-crystal silicon beam specimens covering a range of widths from mm to nmare analyzed using this method. The analysis indicates a reduction in scatter in addition to increase instrength with diminishing specimen size, and quantifies a systematic tightening in flaw distributionassociated with refinement in fabrication method and the limitations of physical sizes on flawdimensions, which is consistent with the experimental observations. Furthermore, the implications ofthe increased strength and reduced strength scatter to the processing techniques and structuralintegrity of MEMS devices are discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1425.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Fabrication and Properties of Hydroxyapatite-Ti Network Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 41-48 
    Details
    ISSN: 1662-8985
    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: Hydroxyapatite (HA) powder was synthesized by a sol-gel method with Ca(OH)2 andH3PO4 as reactants. The HA granules were then coated with TiH2 powder using a mechanicalmixing method. The HA-TiH2 material system produced HA-Ti composites after hot-pressing at1050ºC. The HA-Ti composites are mainly composed of HA and Ti, with small amounts of Ca2P2O7and Ca3(PO4)2 phases. Fracture toughness and bending strength are 2.4 MPa·m1/2 and 54.3 MPa,respectively for the HA-20vol%Ti composite, higher than those of the pure HA ceramic. Theimprovement in properties is because of the unique 3D network structure of Ti, which is an idealreinforcement structure for the weak and brittle HA. According to ISO/TR 7405-1984, hemolysistest was performed to evaluate the blood compatibility of the material. The results show that thehemolysis rate of the HA-20vol%Ti composite is 0.56%. Relative growth rates (RGR) of L-929cells soaked after 6 days in the HA-20vol%Ti group, pure Ti group, black group and pure Pb groupwere 132%, 100%, 90% and 6% respectively, while the level of cytotoxicity was grade 0 in HA-Ticomposite group. These results imply that the HA-20vol%Ti composite has good biocompatibilityand bioactivity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.41.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Asymptotic Analysis of Size Dependent Fracture Strength Using Boundary Effect Concept (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 125-133 
    Details
    ISSN: 1662-8985
    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 paper, the extensively-reported “size effect” phenomena in fracture mechanics testsare explained using the boundary effect concept. It is pointed out that the widely-observed size effectin fracture, including the dependence of the fracture energy on ligament, strength and fracturetoughness on crack and/or ligament and the strength of geometrically similar specimens oncharacteristic size, is in fact, due to the boundary influence on the crack tip damage zone.Furthermore, the recently-developed asymptotic model is used to demonstrate that the dependence ofstrength on crack and ligament lengths as well as on the characteristic size of geometrically similarspecimens is a result of the dominance of the distance of the crack tip to specimen boundaries on thespecimen failure mode. To verify further the boundary effect concept, the asymptotic model is alsoapplied to two sets of selected experimental data available in the literature, and the implications arediscussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.125.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Modeling and Analysis of Compressive Properties of Porous NiTi Shape Memory Alloy Using Artificial Neural Network (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 135-140 
    Details
    ISSN: 1662-8985
    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: Artificial neural network (ANN) is an intriguing data processing technique. Over the lastdecade, it was applied widely in the chemistry field, but there were few applications in the porousNiTi shape memory alloy (SMA). In this paper, 32 sets of samples from thermal explosionexperiments were used to build a three-layer BP (back propagation) neural network model. Accordingto the registered BP model, the effect of process parameters including heating rate ( ), green density( ) and particle size of Ti ( d ) on compressive properties of reacted products including ultimatecompressive strength (vDσ ) and ultimate compressive strain (ε ) was analyzed. The predicted resultsagree with the actual data within reasonable experimental error, which shows that the BP model is apractically very useful tool in the properties analysis and process parameters design of the porousNiTi SMA prepared by thermal explosion method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.135.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Sintering Conditions on the Properties of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/Ti(C,N) Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 241-246 
    Details
    ISSN: 1662-8985
    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: This paper presents a study on the densification and mechanical properties ofAl2O3/Ti(C,N) ceramics processed using a pressureless sintering technique. The Al2O3/Ti(C,N)ceramics containing 10, 20, 30 and 40 wt% Ti(C,N) were sintered in the temperatures ranging from1500 to 1750 °C and in the atmospheres of vacuum, Ar, H2 and N2. It is found that both optimumsintering temperature and Ti(C,N) content exist, where the best densification and mechanicalproperties are achieved. The Al2O3/Ti(C,N) properties will decrease when either sinteringtemperature or Ti(C,N) content moves away from their optimum value. The experimental results alsodemonstrate that among the four atmospheres, Ar gives best results. To improve further theproperties of Al2O3/Ti(C,N) composites, Al2O3 and Al2O3/Ti(C,N) powders have used to cover thespecimens during sintering, and experiments revealed that covering with Al2O3/Ti(C,N) powder cansignificantly improve the properties of Al2O3/Ti(C,N) ceramics. Furthermore, the effects of Ti(C,N)content and sintering conditions on densification and mechanical properties are explained in terms oftheir influences on Al2O3/Ti(C,N) microstructures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.241.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Boron Purity on Superconducting Properties of SiC Doped MgB〈sub〉2〈/sub〉 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 253-258 
    Details
    ISSN: 1662-8985
    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 effect of purity of amorphous boron raw materials on properties of the hot pressed SiCdoped MgB2 superconductor was investigated. MgB2 superconductors with magnetic Jc over 106A/cm2 and remaining Jc of 105 A/cm2 at 4.2 K and 5 T were fabricated by hot pressing using both highpurity (99.00%) and low purity (88.84%) boron powders. XRD analysis shows that purity of theboron powders has little effect on phase component of the MgB2 samples. If the main impurity inamorphous boron is Mg, low purity low cost boron powder is suitable as one of the raw materials forfabricating MgB2. Particle sizes of boron has significant effect on microstructure and properties ofMgB2. Smaller boron particle size leads to smaller grain size of MgB2, higher density, higher latticedistortion, and thus higher magnetic Jc
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.253.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of Open-Cell Alumina Ceramic Foam with Uniform Cell Structure Using Plant Seed Template (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 265-270 
    Details
    ISSN: 1662-8985
    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: Open-cell Al O ceramic foams with uniform cell structures and dense cell struts werefabricated by centrifugal slip casting using the plant seeds as the templates. The rheologicalcharacteristic of Al O slurries with up to 50 vol.% solid content was investigated. The shrinkagematching between the Al O green compact and the plant seeds during drying was studied. The effectof solid contents of slurries on change of green density of cell struts along the height of compacts wasanalyzed. The drying and sintering schedule of Al O green cakes were studied. The results indicatedmass segregation of Al O particles with different sizes during centrifugal process was negligible forslurries with high solid loadings with 50 vol. %. The cell struts of green bodies had high density of63.8% TD. After sintered at 1500 °C for 2 h, the final products had dense cell struts with high sintereddensity of 98.9%TD and homogeneous microstructure. The porosity and compressive strength ofsintered products was 66.5% and 5.26 MPa, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.265.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fabrication of Transparent YAG Ceramics from Co-Precipitation Synthesized Nanopowders (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 271-276 
    Details
    ISSN: 1662-8985
    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: YAG nanopowders were synthesized by a co-precipitation method using ammoniumhydrocarbonate and ammonia water as the precipitants respectively. The influences of precipitantson chemical compositions, phase transformation and sinterability of the prepared powders, andtransmittance of the vacuum-sintered YAG ceramics were studied. The sinterability of powderssynthesized using ammonium hydrocarbonate as precipitant is better than that with ammonia water.Pure YAG phase can be obtained by calcining the hydrate precursor at 1200°C, while some impurityphases exist when calcining the carbonate precursor at the same temperature. Transparent YAGceramics were fabricated by vacuum sintering at 1700°C for 5 h using the YAG nanopowders, andtheir in-line transmittance is about 60% in the visible light range
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.271.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    R-Curve Effect on Statistical Fracture Behaviour of Ceramics (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 53-55 (Jan. 1991), p. 53-57 
    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/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.53-55.53.pdf
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