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  • 11
    Electronic Resource
    Electronic Resource
    Deformation Behavior of Ni-Based Metallic Glass Matrix Composites Reinforced by Brass Short-Fibers Synthesized by Warm Extrusion of Powders (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 937-940 
    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: Deformation behavior of Ni-based metallic glass matrix composites reinforced byshort brass-fibers, synthesized by warm extrusion of gas atomized powders, has been investigated under the uniaxial compression condition at room temperature. The brass-fibers are well distributed in the metallic glass matrix and enhanced macroscopic plasticity is observed due to the formation of multiple shear bands, initiated from the interface between brass-fiber and metallic glass matrix, as well as their confinement between the brass-fibers, stemming from the constrained plastic deformation of the reinforcing brass phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.937.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Application of Taguchi Method for Optimization of Vacuum Plasma Sprayed CoNiCrAlY Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1549-1552 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Bond coatings, CoNiCrAlY, are prepared on Inconel 738 substrate by vacuum plasmaspray (VPS). Mechanical properties of VPSed CoNiCrAlY coatings are investigated via Taguchimethod and L18(21×37)[removed info]orthogonal arrays to determine the optimal setting and the relationship ofexperimental variables. Seven parameters were considered as follows: (A) arc current; (B) primarygas flow rate; (C) secondary gas flow rate; (D) stand-off distance; (E) working pressure; (F) carriergas flow rate (Ar); and (G) powder feeding rate.[removed info]The effect of carrier gas flow rate on the porosity isdetermined to be the highest among the parameters investigated. Higher microhardness values areobserved for the VPSed coatings as compared to the coatings prepared by conventional highvelocity oxygen fuel probably due to low amount of the porosity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1549.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Highly Sinterable Lithium Titanate Powders Fabricated by an Organic-Inorganic Solution Route (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 807-810 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Highly sinterable lithium titanate (Li2TiO3) powder was fabricated by an organic-inorganicsolution route. Liquid-type ethylene glycol (EG) was used as an organic carrier for the metal cations.Titanium isopropoxide and lithium nitrate were dissolved in the liquid-type ethylene glycol withoutany precipitation. The dried precursor gel showed crystalline form at 300 °C and carbon-free Li2TiO3was observed above 400 °C. The primary particle size of the carbon-free Li2TiO3 was about 100 nm,and the structure of the crystallized powder was porous and agglomerated. The porous powder wasball-milled and easily ground to fine particles. The powder compact was densified to 93% theoreticaldensity (TD) at relatively low sintering temperature of 1100 °C for 2 h. The densifed Li2TiO3 showeda small grain size of 1.2 μm. As well, the grain size was notably increased at 1200 °C and above. Afterthe over grain growth, further densification was no more observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.807.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Sinterbility and Mechanical Properties of Zirconia Nanoparticles Prepared by Hydrothermal Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1293-1296 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A hydrothermal method has been used to produce nanoparticles of 3 mol% yttria-stabilizedtetragonal zirconia (3Y-TZP) with high fracture toughness. The effects of reaction temperature andpH on crystallite size and sintered density, and the influence of Nb2O5 addition into 3Y-TZP ontoughness have been investigated. The particle size increased with increasing the processingparameters and the influence of temperature was more significant than pH. The density of nanosized3Y-TZP increased with increasing pH up to 9 and then decreased abruptly with further increase. Thedensity increased slightly with the reaction temperature up to 140°C and then changed little withincreasing temperature. The toughness increased in proportional to the Nb2O5 content. After sinteringfor 1 h at 1270°C, the highest relative density of 98% was obtained from nanoparticles of about 17nm, prepared at 200°C and pH 9, and the toughness of 3Y-TZP was increased from 2.5 to 8.3MPam1/2 by addition of 1.2 mol% Nb2O5
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1293.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    A New Control Algorithm for Impressed Current Cathodic Protection on the Underwater Hull (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 125-128 
    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: Cathodic protection is a system of preventing corrosion by forcing all surfaces of a hull to be cathode by providing external anodes. A metal can be made cathodic by electrically connecting it to a more anodic metal within the electrolyte. Anodes of these metals corrodepreferentially, the corrosion current of the anode achieving cathodic protection of the underwater hull to which they are connected. This paper presents a new current control algorithm for ICCP (Impressed Current Cathodic Protection) system. The anode of ICCP system is controlled by an external DC source with converter. The function of anode is to conduct the protective current into seawater. The DC source is generally obtained from main power system that contains a transformer, converter and etc. The proposed algorithm can operate AC-DC converter with current link. This algorithm includes the harmonic suppression control strategy and the optimum protection strategy and has tried to test therequirement current density for protection, the influence of voltage, the protection potential. Also, the properties of ICCP protected hull of ship in seawater are evaluated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.125.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Wear of UHMWPE against Zirconia/Alumina Composite (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 625-628 
    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 sliding wear behavior of ultra high molecular weight polyethylene (UHMWPE) was examined on a novel low temperature degradation-free zirconia/alumina composite material and on the conventional ceramics (alumina and zirconia) used for a femoral head in total hip joint replacement. The wear of UHMWPE pins against these ceramic disks was evaluated by performing linear reciprocal sliding and repeat pass rotational sliding tests for one million cycles in a bovine serum. The weight loss of polyethylene against the novel low temperature degradation-free zirconia/alumina composite disks was much less than conventional ceramics for all tests. The meanweight loss of the polyethylene pins was more in the linear reciprocal sliding test than in the repeat pass rotational sliding test for all kinds of disk materials. Neither the coherent transfer film nor the surface damage was observed on the surface of the novel zirconia/alumina composite disks during the test. In conclusion, the novel zirconia/alumina composite leads the least wear of polyethylene among the tested ceramics and demonstrates the potential as the alternative materials for femoralhead in total hip joint replacement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.625.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Wear Behaviors of UHMWPE against LTD-Free Zirconia/Alumina Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 1011-1014 
    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 sliding wear behavior of ultra high molecular weight polyethylene (UHMWPE)was examined on four different compositions of novel low temperature degradation-free zirconia/alumina (Z/A) composite material used for a femoral head in total hip joint replacement. The wear of UHMWPE pins against these Z/A composite disks were evaluated by performing the linear reciprocal sliding and repeat pass rotational sliding tests for one million cycles in a bovine serum. The novel low temperature degradation (LTD)-free tetragonal zirconia polycrystal (TZP)/aluminacomposite (90(5.3Y, 4.6Nb)-TZP/10Al2O3) induced the less wear amount of UHMWPE than the other Z/A composites. Linear reciprocal motion wore more the UHMWPE pin than did repeat pass rotational motion for all disk materials. It was observed that few transfer film on the sliding track of Z/A composite disks and the matching contact surfaces of pins had relatively less scratch. Getting rid of transfer film, there is no change of surface roughness on the sliding track of Z/Acomposite disks. This novel Z/A composite (90(5.3Y, 4.6Nb)-TZP/10 Al2O3) demonstrates the potential as an alternative material for the femoral head in total hip replacement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.1011.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Biocompatibility of Calcium Phosphate Ceramics Synthesized from Eggshell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 23-26 
    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 aim of this paper was the HA and β-TCP powers were synthesized by a new wetchemicalmethod using eggshell and phosphoric acid. The biocompatibility of synthesized naturalHA, HA/β-TCP(50:50) and β-TCP derived from eggshell was compared with those of ascommercial chemical powder with mesenchymal stem cells derived from human bone marrow.Development of crystalline phases of the mixtures was studied as functions of mixing ratio andtemperature using X-ray diffractometer. The morphological characteristics of the calcinedeggshell and synthesized powders were examined by scaning electron microscopy. The in-vitrocytotoxicity and cell attachment of sintered disks were examined using human bone marrowderivedmultipotent stem cells(hBMSCs). Cell response was characterized by MTT assay ,Alkaline phosphatase stain and RT-PCR analysis. Pure HA was synthesized in the mixing ratio of1:1.1 wt% at 900℃ for 1h. the crystallization of HA was started at 800℃ in the 1:1.1 mixingratio, ant the HA phase was continued up to the high temperatures. In the ratio of 1:1.3 and1:1.5 wt%, β-TCP was effectively synthesized at 900℃. In the 1:1.5 ratio, β-TCP phase wasdetected at 700℃, and complete crystallized β-TCP was observed above 900℃. At the highertemperature than 1000℃, the β-TCP was gradually decreased and α-TCP was observed. The HAand β-TCP disk does not exert cytotoxic effect on the hBMSCs undergoing osteoblasticdifferentiation. In addition, the hBMSCs are adhered on the surface of synthesized natural HAand β-TCP disk as successfully as on the culture plate or as commercial chemical HA and β-TCPdisk. The hBMSCs adhered on either synthesized natural HA, β-TCP or as commercial chemicalHA, β-TCP disk displays undistinguishable actin arrangement and cellular phenotypes, indicatingthat synthesized natural HA, β-TCP does not disrupt normal cellular responses. Analysis ofdifferentiation of the hBMSCs cultured on culture plate, synthesized natural HA, β-TCP and ascommercial chemichal HA, β-TCP disk shows that three matrices are able to support osteoblasticdifferentiation of the hBMSCs as accessed by alkaline phosphatase staining
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.23.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Influence of Hydrothermal Processing Parameters on Phase Stability of Hydroxyapatite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 877-880 
    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: Nanosized hydroxyapatite(HAp) was synthesized hydrothermally and influence ofprocessing parameters, such as reaction temperature and time, pH, and Ca/P ratio, on the phasestability of HAp was evaluated after pressureless sintering at 1250°C in air. The highest stabilitywas achieved from the powder obtained at a processing condition for the lowest solubility of Ca2+,which corresponds to temperature close to 200°C, time 〈4h, pH〉9.0, and Ca/P = 1.67. The stabilityof nanosized HAp in HAp/3Y-TZP composites was slightly inferior to commercial one, but theinvolvement of hydrothermally synthesized HAp improved sintered density of the composites andstability of t-ZrO2 phase in the composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.877.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Preformed Laminating Veneer Porcelain Using Paste System for Fabrication of PFM Crowns (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 937-940 
    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: Feldspathic porcelain paste system using organic vehicle was prepared and applied to fabricate the porcelain fused to metal fixed partial denture. The mean linear fired shrinkage of paste porcelain system was 15.2% that is 0.8% lower than that of conventional build-up method. The color difference between two methods (??E*) was 0.156. Mean biaxial flexural strength of sintered preformed laminating porcelains of this system and conventionally build-up porcelains were 74±3and 70±4 MPa respectively. There was no deterioration of physical properties of feldspathic porcelain system by introducing organic vehicle, and this new build-up method can be applied to fabricate the porcelain fused to metal restorations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.937.pdf
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