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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of Adhesion Strength for Patterned Single Layer Ceramic Capacitor Sheet (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1181-1184 
    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: Adhesion strength for single layer ceramic capacitor sheet, used in MLCC(MultilayerCeramic Capacitor), was measured by peel tests. The peel strength was measured during theseparation of the ceramic sheet from the PET film using the peel testing system developed in thisstudy. The sheet specimen was adhered on the glass jig floating on the liquid media, which wasdesigned to minimize the friction, and the specimen was pulled up by micro-actuator. In this study, thedependency of the specimen width, peel angle and testing speed on the adhesive strength wasexperimentally investigated. It was found that the adhesive strength for the ceramic sheet is nearlyidentical, irrespective of the specimen width ranged from 5 to 20 mm, and the adhesive strength wasincreased with increasing testing speed. Furthermore, the strength was shown to be dependent on thepeel angle
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1181.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Growth Model of Circumferential Outer Diameter Stress Corrosion Crack in Retired Steam Generator Tube of Kori 1 Nuclear Power Plant (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1529-1532 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Growth model of a circumferential outer diameter stress corrosion crack (ODSCC) in a retiredsteam generator tube of the Kori 1 nuclear power plant was proposed based on extensive destructiveexaminations of the pulled tubes of Alloy 600 from the Kori 1 plant. A small ODSCC grows in alateral direction as well as a forward direction until it meets a neighboring ODSCC which alsogrows in a lateral direction as well as a forward direction. And then, the two ODSCCs which meeton the same circumferential plane are consolidated into a single ODSCC. By repeating such aconsolidation process with time, it seems that the apparent growth rate of an ODSCC in the lateraldirection is much faster than that in the forward direction. Growth model of a circumferentialODSCC from a retired steam generator tube of the Kori 1 plant reveals that many ODSCCs areinitiated and grow in both directions independently until they meet and finally they are consolidated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1529.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Application of Mesophilic Mixed Micro-Organisms for Recovery of Valuable Metals from Spent Refinery Catalysts (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 20-21 (July 2007), p. 119-125 
    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: Bioleaching of pre-treated spent refinery catalyst was performed using sulfur and ironoxidizing bacteria separately. Both the mixed cultures were grown at various concentration of eitherferrous sulfate or elemental sulfur. Bioleaching process was conducted by varying the reaction time,effect of substrates and effect of catalyst amount. Under the most favourable transport conditionsexamined, (5g/L spent catalysts, 10g/L ferrous sulfate, reaction time 7 days) the mixed ironoxidizing bacteria were able to recover Ni, V, and Mo of 90, 80 and 54 % respectively. Highercatalyst and ferrous sulfate concentration showed decline result in recovery of Mo and V. Nishowed consistent results throughout the series of experiments (88 to 90% recovery).The mixed sulfur oxidizing bacteria were observed to be more effective than the iron oxidizingbacteria. The sulfur oxidizing cells were able to recover Ni, V and Mo of 88, 94 and 46 %respectively (spent catalysts 50g/L, elemental sulfur of 2% (w/v), reaction time 7 days). Theoxidation of elemental sulfur to sulfate could play a vital role for extraction of the metals
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.119.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Lead and Boride Inhibitors on the Passivity of Nickel Alloy 600 Surface (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 1466-1469 
    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: Corrosion-resistant nickel-based Alloy 600 is susceptible to a lead-induced stresscorrosion cracking (PbSCC) in aqueous solutions. The lead species incorporated into the oxide atthe alloy surface degraded the passivity, and caused the PbSCC. Effects of lead on the properties ofthe surface passive films were investigated. The cross sections of the surface films were examinedby the transmission electron microscopy and the species present in the films were analyzed with theenergy dispersive x-ray spectroscopy and the x-ray photoelectron spectroscopy. In-depthconcentration profiles of the species were analyzed by using an ion sputtering technique. Theelectrochemical impedance spectroscopy technique was used to characterize the electrochemicalbehaviors. Effectiveness of a nickel boride inhibitor was evaluated. The boride inhibitor altered theproperties of the passive film, and significantly reduced the susceptibility to the PbSCC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.1466.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Production of Silver Coated Copper Powders by Electroless Plating Method (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 570-574 
    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: Copper powders with very dense, uniform silver coating layer were prepared by electrolessplating method in aqueous system at room temperature. Silver-copper composite powders wereobtained by strictly controlling the activation and complexing process variables such asNH4OH/(NH4)2SO4 molar ratio, tartrate concentration, and feeding rate of silver ion solution. Themechanism of composite powders formation and their characteristics were discussed. It is noted thatcompletely cleansing the oxide layers and protecting the copper particles surface from hydrolysisare key factors to obtain high quality Ag-Cu composite powders
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.570.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Material Property of a Passive Oxide Formed on Alloy 600 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 937-940 
    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: Alloy 600 is used as a material for a steam generator tubing in pressurized waterreactors(PWR) due to its high corrosion resistance under a PWR environment. In spite of its corrosionresistance, a stress corrosion cracking(SCC) has occurred on the primary side as well as the secondaryside of a tubing. It is known that a SCC is related to the electrochemical behaviors of an anodicdissolution and a passivation of a bare surface of metals and alloys. Therefore in the present work, thepassive oxide films on Alloy 600 have been investigated as a function of the solution temperature byusing a potentiodynamic polarization, electrochemical impedance spectroscopy and a TEM, equippedwith EDS. Moreover the semiconductive property was evaluated by using the Mott-Schottky relation.It was found that the passivity depends on the chemical composition and the densification of the oxidefilm rather than the oxide thickness. As the solution temperature of 0.5M H3BO3 increased, thethickness of the passive film increased but the oxide resistance of the passive film was decreased,indicating that the measured current in the passive region of the potentiodynamic curve is closelyrelated to the stability of the passive film rather than the oxide thickness. It was found that the oxidefilms were composed of an outer oxide layer with a lower resistance and an inner oxide layer with arelatively higher resistance. From the Mott-Schottky relation, the oxide formed at 300oC showed ap-type semiconductor property unlike the n-type oxide films up to 250oC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.937.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A Passive Film Formed on Alloy 600 in High Temperature Aqueous Solution (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 135 (Feb. 2008), p. 103-106 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Alloy 600(74wt% Ni, 15wt% Cr, 9wt% Fe) is used as a material for steam generatortubing in pressurized water reactors(PWR) due to its high corrosion resistance under a PWRenvironment whose primary side and secondary side are operated under 340oC, 150bar and 290oC,50bar, respectively. However, in spite of its outstanding corrosion resistance, a stress corrosioncracking(SCC) which has been one of the most important degradation issues, has occurredoccasionally owing to the severe high temperature and pressure condition of a PWR. It is expectedthat a SCC is deeply related to an electrochemical property of a passive film formed under a hightemperature and pressure condition. Therefore an understanding of the basic electrochemicalbehaviors regarding an anodic dissolution and a passivation of the bare surface of metals and alloysprovides important information about a SCC mechanism and control. In the present work, thepassive oxide films on Alloy 600 were investigated as a function of the dissolved oxygen contentand the pH by using a potentiodynamic polarization, electrochemical impedance spectroscopy(EIS)and a depth profiling by Auger electron spectroscopy(AES). For this purpose, 0.5M H3BO3, 0.5MNa2SO4 and 0.1M NaOH aqueous solutions with/without dissolved oxygen at 300oC were used asthe test solutions. The resistance of an oxide formed in an aerated solution was smaller than that in adeaerated solution while the oxide film in the aerated solution was thicker than the oxide film in thedeaerated solution
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.135.103.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Formation Characterization of Ultra-Fine Cu Powder from Cu(OH)〈sub〉2〈/sub〉 Slurry by Wet Reduction Method (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 646-649 
    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: Ultra-fine copper powders with an average size of 150 nm were synthesized fromCu(OH)2 .H2O slurry with hydrazine monohydrate as a reduction agent by using the wet reduction method. Parameters such as temperature, reduction agent feeding rate, stirring rate, stirring speed, Cu(OH)2 concentration, and surfactants were investigated. It was found that the feeding rate of hydrazine monohydrate and the use of surfactants mainly affect the morphology and size of the copper powders along with their dispersion. XRD, PSA, and SEM were used to characterize theprepared particles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.646.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Self-Propagating High-Temperature Synthesis for Aluminum Oxynitride (AlON) (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 662-665 
    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: As the result of combustion reaction in Al-Al2O3-N2 system, AlON phase can besynthesized in the range of initial nitrogen pressure, from 1 to 5 MPa. On the occasion of rm = 0.3, the unreacted Al was detected in the case of 1 MPa of PN2. Its intensity decreases with an increase of nitrogen pressure. Ultimately, no peak of Al was observed in the product at nitrogen pressure of 5 MPa. In addition, the peak intensity of AlON in the products increases proportionally with the nitrogen pressure, while the intensities of AlN and Al2O3 decrease slightly with an increase ofnitrogen pressure. The formation of AlON may be induced by successive two reactions. The former is the formation of AlN, and the latter is the reaction between AlN and Al2O3 in the after-burning period sustaining high temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.662.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Controlling the Growth of Cu Particles through Semibatch Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 683-688 
    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 order to produce monodispersed particles, two requirements are considered; they are acomplete separation of nucleation and growth steps for the formation of particles and an avoidanceof their aggregation during the nucleation and growth. In this study, a new method was presentedfor preparing narrowly size distributed copper powders from CuO slurry by wet chemical reductionwith hydrazine used as a reductant. The rapid nucleation was first induced by a very fast reductionof Pd2+ resulted from batch process. Subsequently copper species which contribute to the growth onthe formed Pdo nuclei was slowly generated by semibatch process. A complete separation betweennucleation and growth therefore was obtained, resulting in a narrow size distribution of final Cupowder product. The effect parameters on the growth such as Pd2+ concentration and temperaturewere also investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.683.pdf
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