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  • 1
    Electronic Resource
    Electronic Resource
    A Study on Concrescence of Inert Nano Bioceramic Scalpel Wounds (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2115-2118 
    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: Over the last 100 years innovative techniques in the fabrication of ceramics have led totheir use as high-tech materials. Inert bioceramics, such as ZrO2, have inherently low level ofreactivity compared with other materials such as polymers and metals as well as surface reactive orresorbable ceramics. The aim of this study was to validate the effect of incision using a zirconia inertbioceramic scalpel to incise animal body and to prove incision property of tissues before clinic. Theexperiments of incisions concrescence using a sterilized Zirconia inert bioceramic scalpel wereinvestigated in this paper. We used 4-month-old inbred line SD rats as experiment animals. They weredivided into three groups to undergo incision on the back skin and subcutaneous tissue. Thesubcutaneous tissue and musculature samples were obtained and analyzed by optical microscopy at 3,7 and 14 days for histopathological evaluation respectively. The experimental results showed that nowound dehiscence was observed after suture removal at 14 days after the operation. The experimentsproved that an inert bioceramic scapel was nontoxic, nonallergenic, and noncarcinogenic for incisionsthat obtained normal concrescence criteria two weeks after operation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2115.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication and Fracture Properties of Nano-Sized HAP-TZP (3Y) Bioceramic for Artificial Joints (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2119-2122 
    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: Hydroxyapatite is a kind of ideal biomaterials for bone and teeth replacement, but its lowstrength and brittleness need to improve. As bone replacing materials, hydroxyapatite (HAP) andzirconia both have advantage and disadvantage. Nano-sized HAP-ZrO2 powders and HAP-TZP (3Y)(3mol% yttria - stabilized cubic zirconia) bioceramic for artificial joint have been fabricated in thispaper. The nano-sized HAP-ZrO2 powders with homogeneous distribution could be synthesized bytwo-step precipitation method. The HAP-TZP bioceramic with small grain size could be obtained byusing hot-press sintering technology, and the sintering parameters are: sintering temperaturesT=1300°C, sintering pressure p=30MPa and sintering time t=30min. The mechanical properties,microstructures and fracture pattern that were analyzed by SEM and optical microscopy of theHAP-TZP bioceramic were investigated systematically. The results show that no reaction betweenHAP and ZrO2 powders, which could be attributed to the very short sintering time of hot presssintering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2119.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of Initial Density of Green Compact on Hot-Press Sintering and Superplastic Forming of Nano 3Y-TZP (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 224-226 (June 2002), p. 721-724 
    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/2011/0528/01/46/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.224-226.721.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of ZrB〈sub〉2〈/sub〉-Based UHTC via Reactive Hot Pressing (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1737-1739 
    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: ZrB2-based ultra-high temperature ceramics (UHTCs) were prepared from a mixture powder ofZr/B4C/Si with different ratio via reactive hot pressing. The experimental results showed that the sinteringtemperature above 1800°C was necessary for enhancing the activity of the powders and thus improvingthe densification of the product. The sinterability and densification properties of ZrB2-based UHTCsmeliorated with the amount of Si increasing. However, many large ZrB2 agglomerates formed when theamount of synthesized SiC in the product reached 25vol%, which led to decrease the mechanicalproperty. The composite had highest mechanical properties when the volume ratio of ZrB2: SiC: ZrC was73.86:20:6.14, and its flexual strength and the fracture toughness were 645.8MPa and 5.66MPa·m1/2respectively. The microstructure investigation showed the in-situ formed SiC and ZrC were located in thetriple point of ZrB2 grains with a size less than 3μm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1737.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Superplasticity and Sinter-Forging of Fine-Grained Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉-Si〈sub〉2〈/sub〉N〈sub〉2〈/sub〉O Composite (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2987-2990 
    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: The Si3N4- Si2N2O composites are fabricated with amorphous nano-sized silicon nitride powders by the liquid phase sintering(LPS) method in this article. XRD analysis shows that the sintered body consists of β-Si3N4 and Si2N2O. SEM experiment conforms that the average grain size of sintered body is less than 300nm. The superplastic deep-drawing forming can be proceed at a low temperature of 1550℃ with a forming velocity of 0.2mm/min. There are only a few small sintered defects before forming, but there are a lot of cavity groups after forming. Cavitation failure occurs by nucleation, growth and interlinkage of cavities. The complex-shape gears can be formed by a sinter-forging technology when the sintering temperature is 1600℃ and the superplastic forging temperature is 1550℃
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2987.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Superplastic Deformation on the Properties of Zirconia Dispersed Alumina Nanocomposite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 527-532 
    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: In this paper constrained extrusion of the zirconia dispersed alumina nanocomposite undersuperplastic conditions was conducted. The mechanical properties of deformed material were studiedand its results were compared with those of the initial materials. The microstructure evolution duringsuperplastic deformation was also analyzed. The results demonstrated that after superplastic extrusionthe flexural strength, relative density, Vickers hardness as well as fracture toughness of the materialincreased noticeably. The flexural strength of the deformed composite even retained at a high value of310MPa at 800°C. The fracture toughness of the material increased from 6.92 MPa·m1/2 to 8.87MPa·m1/2 after deformation. After superplastic extrusion due to grain boundary sliding and thecompressive stress state, the internal porosities in as-sintered materials were eliminated. Duringextrusion with grain coarsening the effect of t-ZrO2 to m-ZrO2 transformation toughening increasedbecause more zirconia grains reached the critical dimension. Although grain coarsening may causethe decrease of the fracture toughness in some extent, the phase transformation toughening andstrengthening dominated. As a result, the mechanical properties of the deformed material wereimproved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.527.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Superplastic Forming and Diffusion Bonding for Four-Layer Sheets Structure of Nickel-Base Superalloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 163-168 
    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: The superplastic forming and diffusion bonding (SPF/DB) is applied in aviation and spaceflight field. The SPF/DB process with gas pressure control for dissimilar superalloy structure wasstudied. Diffusion bonding parameters, including bonding temperature T, pressure P, time t, affect thejoining mechanism. When the bonded specimen with 50&m thick nickel foil interlayer was tensile atroom temperature, shear fracture of the joints with nickel foil interlayer takes place at the GH4141superalloy part. The SPF/DB of four-layer sheets structure was investigated. The optimum parametersfor the SPF/DB process are: forming temperature T=1243K, forming pressure P=1MPa, forming timet=35min. The microstructure of the bonded samples was characterized. The microstructure shows anexcellent bonding at the interfaces. The distribution of thickness after SPF/DB was investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.163.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and Superplastic Deep Drawing of TiAl Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 467-472 
    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: TiAl alloys are powerful candidates for light weight high temperature structural materialsbecause of their excellent high temperature strength, low density and good oxidation resistance.Unfortunately, TiAl alloys are difficult to machine and hot working due to ordered structure, whichimpede large-scale application. Synthesis and superplastic deep drawing of a TiAl alloy were studied.Mechanically synthesized fine crystalline Ti/Al composite powders as precursor of TiAl alloy. TheTiAl alloy with fine grain via reactive sintering was obtained. The deformation behavior under biaxialstress by means of deep drawing was achieved. The optimum temperature is 1100°C≤T≤1150°C. Themicrostructures corresponding to deep drawing in the part were studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.467.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Superplastic Extrusion of Ultra Fine-Grained 3Y-TZP/Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Ceramic for Turbine Disk (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 501-506 
    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: Superplastic extrusion of axial forcing and radial flowing under different conditions wasadopted to form a turbo-rotor, using hot-press sintered compact of zirconia (3Y)-toughened aluminacomposite that was prepared at 1450 °C for 1 hour with relative density of higher than 96%.Subsequent superplastic extrusion was attempted at temperature of 1500 °C-1650 °C. The resultsindicate that 3Y-ZrO2 plays an important role as a second-phase pinning agent and inhibits graingrowth. The material shows good deformability and potential of near-net-shape forming. Comparingwith undeformed sample, extruded sample was observed apparent coarsening in grain size and theremaining mechanical properties after deformation are not improved, irrespective of improveddensity. The dominating deformation mechanism is grain sliding and rotation accommodated withzirconia coordinated deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.501.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Tribology in Superplastic Forming Processing of 3Y-TZP/Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Ceramic at Elevated Temperatures (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 507-512 
    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: Superplastic forming processing of ceramic materials at high temperatures and highpressure puts forward very high requests to moulds and lubricants, at which conditions seeking forappropriate lubricants is one of important preconditions in the superplastic forming of ceramicmaterials. Using ring compressive testing, lubricities of hexagonal boron nitride in superplasticcompressive forming processing of 3Y-TZP/Al2O3 ceramic composite at elevated temperatures wereinvestigated. Theoretical curves of friction factor were drawn according to upper bound method. Ringcompressive tests were adopted at temperature of 1400 °C-1600 °C. The results indicate that whenBN is used, friction factor is about 0.4, meanwhile friction factor don’t have great changes with highertemperature and increasing strain rate. X-ray diffraction shows that under high temperature and highpressure no boron nitride converts to cubic phase, which remains at room temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.507.pdf
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